Re: LC meter project PCBs
Greetings, I only have ONE (JLCPCB) W8BH LC Meter PCB left, so please ask about availability before sending any money for it. This is the first time I have ever done this type of transaction. It has been a learning experience. Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutorOn Wed, Apr 20, 2022 at 2:44 PM Ken KM4NFQ via groups.io <km4nfq@...> wrote:
Greetings,
I have four extra W8BH LC Meter PCBs from JLCPCB.
These are prototype PCBs.
Preference will be given to FCC licensed Amateur Radio Hams.
One PCB per Ham. Please include your name and callsign.
Bruce suggested that I ask for $5.00 for each PCB.
That price includes S&H. The PCB will ship in a padded envelope.
Payment will be via PayPal.
My PayPal account is: k dot w dot melvin at gmail dot com
The PCB will be sent via USPS 1st class mail with a tracking number.
I will ship to the address provided by the FCC ULS registry.
If the above meets your expectations, I am ready to ship a PCB to you.
First come, first served, while supplies last.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
|
One small update:? I added a case with a 9V battery compartment.? All?three case designs are posted here:??
Bruce
|
Greetings, I have four extra W8BH LC Meter PCBs from JLCPCB. These are prototype PCBs. Preference will be given to FCC licensed Amateur Radio Hams. One PCB per Ham. Please include your name and callsign. Bruce suggested that I ask for $5.00 for each PCB. That price includes S&H. The PCB will ship in a padded envelope. Payment will be via PayPal. My PayPal account is: k dot w dot melvin at gmail dot com The PCB will be sent via USPS 1st class mail with a tracking number. I will ship to the address provided by the FCC ULS registry. If the above meets your expectations, I am ready to ship a PCB to you. First come, first served, while supplies last. Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutor
|
The LC meter enclosures are now available:
Bruce.
|
Jim,
You ask very good questions which I will try to answer.
Thingiverse has a 24-hour embargo policy on new users/designs.? ?I submitted the designs 2 days ago and I don't see them yet either.? ?I guess we will have to be patient.
My case does not have a battery compartment.? ?Maybe someone else will create one.? I prefer using an AC adapter.? ?
Finding parts can be challenging these days.? ?Check out the Part Sourcing section of the builder's guide, where I give part?numbers and possible alternatives to several key parts, including the DPDT relay.? ?The Nichicon UMA1C100MDD1TP 10uF cap on this list is very short (5mm).? ?They are in stock at Mouser.
The LED case holes line up with the PCB-mounted LEDs.? ?To do what you ask, the LED leads will need to be about 2 cm long.? ?The pressure needed to push LEDs into the press-fit case holes might buckle these long leads.? ?So I would recommend reaming the case holes beforehand.
I encountered many difficulties with coreWeaver's meter - some of which you have mentioned.? ?Our designs both use the excellent AADE oscillator circuit, but the similarity stops there.? The software, power supply, display, enclosure, jacks, pcb layout, and many of the internal components are different.? For?example, you?asked about the Nokia display.? I am not using that model.? The display I am using is color (Nokia is monochrome) and has?higher?resolution (160x128 vs. 84x48).? ?So the digits are larger and easier to read.??
The switch actuators are 13mm long, and the tactile switch buttons are about 2mm tall.? ?So, you?should be able to use a switch with a 15mm-tall button instead.? The case holes are 4mm in diameter which should be large enough.
Bruce
On Fri, Apr 15, 2022 at 2:24 AM Jim Pruitt < jpruitt67@...> wrote:
Hello Bruce.
I did not see your enclosure files on your ThingiVerse link.? It
says no content.
Do you happen to have a case design that allows for/has room for a
9v rectangular battery in your LC meter design?
I notice that you parallel LED's for indicators.? If only one LED
is used instead of 2 in parallel? will they line up with the holes
in the case.? IN other words,? if I leave the LED leads long will
they mate with the case or are they in a different location?
You had your build document for the CoreWeaver version before you
made your own variation.? Were you able to get the Nokia 5110
display to mate correctly with the board and not be too high?? Or
did you make the enclosure he used?? I am just now trying to
finish my CoreWeaver build but the electrolytics I had were 11mm
tall and apparently the ones he used were 7mm tall (and 4mm
diameter and 1.5mm lead spacing) and that size is required or the
display will not fit above the pc board and still fit into his
case/enclosure.? I had trouble finding that size at the usual
distributors.
Thank you for designing this your variation.? I liked the
CoreWeaver design but there were just too many challenges (for me)
that should not have been challenges.? I am glad to see LC meters
that read low values as the GM328 Chinese versions I have just
roll over and quit when trying to measure anything lower than 22pf
(and even that is a big maybe so 30pf is closer to the limit for
them) and same thing for inductance as 22uh seems to be the bottom
and again that is also a big maybe (at least for all of the ones
that I have).
You list a Kemet 5v dpdt relay in miniature case UA2-5NJ.? Is that
the same as the ones we talked about before in the CoreWeaver
design (used a Fujitsu NA5WK )? I also see that the one you used
(UA2-5NJ) is showing up as obsolete.? I am wondering if
manufacturers are using this as an excuse to remove through hole
parts from their list.
You did not mention how long the actuators are on the switches you
used.? If switches with 15mm actuators are purchased for your
version will they be too tall?? I assume that 17mm actuator length
would definitely be too tall?? I did not see much of a selection
in that range of lengths for actuators (longer actuators than say
12mm).? Yes, I know,? you made buttons to work on the switches you
used but I was wondering if those could be eliminated if longer
actuator switches were used?
Thank you.
Jim Pruitt
WA7DUY
On 4/13/2022 3:19 PM, Bruce Hall wrote:
The LC meter project is finished and now
includes a 3D printed enclosure.? Links are provided below.
Once again, many thanks to Ken KM4NFQ for reviewing the
documentation.
Bruce
Builder¡¯s
Guide:?
User's
Guide:??
Software
Review:? ?
Enclosure
Description:?
Source Code:??
Schematic:??
Interactive BOM:??
PCB Gerbers:?
|
Hello Bruce.
I did not see your enclosure files on your ThingiVerse link.? It
says no content.
Do you happen to have a case design that allows for/has room for a
9v rectangular battery in your LC meter design?
I notice that you parallel LED's for indicators.? If only one LED
is used instead of 2 in parallel? will they line up with the holes
in the case.? IN other words,? if I leave the LED leads long will
they mate with the case or are they in a different location?
You had your build document for the CoreWeaver version before you
made your own variation.? Were you able to get the Nokia 5110
display to mate correctly with the board and not be too high?? Or
did you make the enclosure he used?? I am just now trying to
finish my CoreWeaver build but the electrolytics I had were 11mm
tall and apparently the ones he used were 7mm tall (and 4mm
diameter and 1.5mm lead spacing) and that size is required or the
display will not fit above the pc board and still fit into his
case/enclosure.? I had trouble finding that size at the usual
distributors.
Thank you for designing this your variation.? I liked the
CoreWeaver design but there were just too many challenges (for me)
that should not have been challenges.? I am glad to see LC meters
that read low values as the GM328 Chinese versions I have just
roll over and quit when trying to measure anything lower than 22pf
(and even that is a big maybe so 30pf is closer to the limit for
them) and same thing for inductance as 22uh seems to be the bottom
and again that is also a big maybe (at least for all of the ones
that I have).
You list a Kemet 5v dpdt relay in miniature case UA2-5NJ.? Is that
the same as the ones we talked about before in the CoreWeaver
design (used a Fujitsu NA5WK )? I also see that the one you used
(UA2-5NJ) is showing up as obsolete.? I am wondering if
manufacturers are using this as an excuse to remove through hole
parts from their list.
You did not mention how long the actuators are on the switches you
used.? If switches with 15mm actuators are purchased for your
version will they be too tall?? I assume that 17mm actuator length
would definitely be too tall?? I did not see much of a selection
in that range of lengths for actuators (longer actuators than say
12mm).? Yes, I know,? you made buttons to work on the switches you
used but I was wondering if those could be eliminated if longer
actuator switches were used?
Thank you.
Jim Pruitt
WA7DUY
On 4/13/2022 3:19 PM, Bruce Hall wrote:
toggle quoted message
Show quoted text
The LC meter project is finished and now
includes a 3D printed enclosure.? Links are provided below.
Once again, many thanks to Ken KM4NFQ for reviewing the
documentation.
Bruce
Builder¡¯s
Guide:?
User's
Guide:??
Software
Review:? ?
Enclosure
Description:?
Source Code:??
Schematic:??
Interactive BOM:??
PCB Gerbers:?
|
Greetings, I would once again like to point to the OSH Park PCBs for the W8BH LC Meter: The OSH Park PCBs are ENIG, purple, and Made in the USA. They send three PCBs per order, by default. I sent one of them to Bruce, and I am keeping two (one as a backup in case I mess-up the first one). Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutor
On Wed, Apr 13, 2022 at 6:59 PM Bill AG5ZN <wrstrand@...> wrote:
I know that I speak for many when I say thanks to you for your really excellent projects (which you make available to all, and you thoroughly detail on your website).
You make this adventure approachable, fun and successful.
Again, many thanks.
Bill AG5ZN
On Wed, Apr 13, 2022 at 5:20 PM Bruce Hall <bhall66@...> wrote:
The LC meter project is finished and now includes a 3D printed enclosure. Links are provided below.
Once again, many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
w8bh.net
Builder¡¯s Guide:
User's Guide:
Software Review:
Enclosure Description:
Source Code:
Schematic:
Interactive BOM: LC Meter - BN49 BOM (w8bh.net)
PCB Gerbers:
|
I know that I speak for many when I say thanks to you for your really excellent projects (which you make available to all, and you thoroughly detail on your website). You make this adventure approachable, fun and successful. Again, many thanks. Bill AG5ZN
On Wed, Apr 13, 2022 at 5:20 PM Bruce Hall < bhall66@...> wrote: The LC meter project is finished and now includes a 3D printed enclosure.? Links are provided below. Once again, many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Builder¡¯s Guide:? User's Guide:?? Software Review:? ? Enclosure Description:? Source Code:?? Schematic:?? Interactive BOM:?? PCB Gerbers:?
|
The LC meter project is finished and now includes a 3D printed enclosure.? Links are provided below. Once again, many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Builder¡¯s Guide:? User's Guide:?? Software Review:? ? Enclosure Description:? Source Code:?? Schematic:?? Interactive BOM:?? PCB Gerbers:?
|
Greetings, I have ordered 3 W8BH LC Meter PCBs from OSH Park. These are high quality PCBs, suitable for a piece of test equipment. My OSH Park W8BH LC Meter PCB order can be viewed here: Most of the AADE-based LC Meter designs I have seen use a PIC microcontroller. The W8BH LC Meter uses an ATmega328P-PU microcontroller which can be programmed in the Arduino IDE. Previously, I have built the coreWeaver LC Meter, also based on Neil Hecht's AADE LC Meter design. The coreWeaver PCB has very small solder pads. It was very difficult for me to put it together due to shaky hands and cataracts. The coreWeaver LC Meter uses an ATmega328P-PU microcontroller. However, his source code was written in AVR BASCOM. I did not feel like spending over $100 to buy that compiler. Furthermore, some of the components coreWeaver used are hard to find. I was lucky to buy some of the last ones available. So I sent one of the coreWeaver PCBs to Bruce W8BH, and he built it and wrote an Arduino Sketch for it. After that, he decided to design his own LC Meter, using the ATmega328P-PU MCU, and the Arduino IDE. His PCB has larger soldering pads, so it should be much easier to put together. Bruce also shopped around and found easily available parts. If you do not care to spend too much money on an LC Meter, then order your PCBs from JLCPCB, or your favorite PCB fabrication house. So if you are interested in building a fine piece of test equipment, seriously consider the W8BH LC Meter. You will be pleased. FYI: All the PCBs I have ordered are already spoken for. Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutor
On Fri, Mar 25, 2022 at 8:11 AM Bruce Hall <bhall66@...> wrote:
Jim,
The link I posted to coreWeaver's GitHub page is for his project only. My LC meter uses a different PCB layout and its Gerbers on my GitHub pages.
You mentioned a few of the differences between the projects, but there are many more. Perhaps the biggest difference is that his project does not use the Arduino IDE. It requires purchase of a BASIC compiler. I was eventually able to get his project to work with the Arduino IDE, but then decided to abandon the project to do my own.
The correct description for the power connector is PJ-102AH (or PJ-102A), not PJ-10AH. It is the same connector used in the Morse Tutor. Sorry about the typo.
I created a 3D-printed "tray" for the meter, which very nicely covers and protects the undersurface of the PCB. I may eventually make a full case, too. I intend to publish the STL files eventually.
Bruce
w8bh.net
On Fri, Mar 25, 2022 at 3:31 AM Jim Pruitt <jpruitt67@...> wrote:
Hello Bruce.
A couple more questions. I notice that you call for a PJ-10AH power connector but in looking at that part it appears to be a chassis mount but looks like the board is laid out for a pc mount version. Is that your intention?
Your builder's guide looks like your device is in a case, what case did you use or if 3D print will the STL file be available later?
The CoreWeaver version used a LM317 with to output 3.3v from the 7805 he used but I do not see anything generating 3.3v. Is that not needed for this build? I had changed my CoreWeaver board to use a LP2950Z-3.3v rather than the harder to find divider resistors to get the right output voltage but it looks like you do not use a 3.3v circuit.
I am glad to see an onboard slide switch for power rather than the off board one that CoreWeaver made.
Thank you.
Jim Pruitt
WA7DUY
On 3/24/2022 4:04 PM, Bruce Hall wrote:
I recently built an LC meter that is based on the famous AADE design. If you are interested, please check out the links below.
Many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
w8bh.net
Part 1: Builder¡¯s Guide:
Part 2: Software Review (pending)
Part 3: User¡¯s Guide (pending)
Full Source Code:
Test Sketches:
Schematic:
Interactive BOM: LC Meter - BN49 BOM (w8bh.net)
PCB Gerbers:
|
Jim,
The link I posted to coreWeaver's GitHub page is for his project only.? ? My LC meter uses a different PCB layout and its Gerbers on my GitHub pages.? ?
You mentioned a few of the differences between the projects, but there are many more.? ?Perhaps the biggest difference is that his project does not use the Arduino IDE.? It requires purchase of a BASIC compiler.? ?I was eventually able to get his project to work with the Arduino IDE, but then decided to abandon the project to do my own.
The correct description for the power connector is PJ-102AH (or PJ-102A), not PJ-10AH.? ?It is the same connector used in the Morse Tutor.? Sorry about the typo.
I created a 3D-printed "tray" for the meter, which very nicely covers and protects the undersurface of the PCB.? I may eventually make a full case, too.? ?I intend to publish the STL files eventually.
Bruce
On Fri, Mar 25, 2022 at 3:31 AM Jim Pruitt < jpruitt67@...> wrote:
Hello Bruce.
A couple more questions.? I notice that you call for a PJ-10AH
power connector but in looking at that part it appears to be a
chassis mount but looks like the board is laid out for a pc mount
version.??? Is that your intention?
Your builder's guide looks like your device is in a case,? what
case did you use or if 3D print will the STL file be available
later?
The CoreWeaver version used a LM317 with to output 3.3v from the
7805 he used but I do not see anything generating 3.3v.? Is that
not needed for this build?? I had changed my CoreWeaver board to
use a LP2950Z-3.3v rather than the harder to find divider
resistors to get the right output voltage but it looks like you do
not use a 3.3v circuit.
I am glad to see an onboard slide switch for power rather than the
off board one that CoreWeaver made.
Thank you.
Jim Pruitt
WA7DUY
On 3/24/2022 4:04 PM, Bruce Hall wrote:
I recently built an LC meter that is based on the
famous?AADE design.? If you are interested, please check out the
links below.
Many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Part
1: Builder¡¯s Guide:
Part
2: Software Review (pending)
Part
3: User¡¯s Guide (pending)
Full
Source Code:?
Test
Sketches:?
Schematic:?
Interactive
BOM:?
PCB
Gerbers:
|
Hello Bruce.
A couple more questions.? I notice that you call for a PJ-10AH
power connector but in looking at that part it appears to be a
chassis mount but looks like the board is laid out for a pc mount
version.??? Is that your intention?
Your builder's guide looks like your device is in a case,? what
case did you use or if 3D print will the STL file be available
later?
The CoreWeaver version used a LM317 with to output 3.3v from the
7805 he used but I do not see anything generating 3.3v.? Is that
not needed for this build?? I had changed my CoreWeaver board to
use a LP2950Z-3.3v rather than the harder to find divider
resistors to get the right output voltage but it looks like you do
not use a 3.3v circuit.
I am glad to see an onboard slide switch for power rather than the
off board one that CoreWeaver made.
Thank you.
Jim Pruitt
WA7DUY
On 3/24/2022 4:04 PM, Bruce Hall wrote:
toggle quoted message
Show quoted text
I recently built an LC meter that is based on the
famous?AADE design.? If you are interested, please check out the
links below.
Many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Part
1: Builder¡¯s Guide:
Part
2: Software Review (pending)
Part
3: User¡¯s Guide (pending)
Full
Source Code:?
Test
Sketches:?
Schematic:?
Interactive
BOM:?
PCB
Gerbers:
|
Bruce,? are the gerbers you linked on
CoreWeaver's github feed for the layout you show in your builder's
guide?? I see it is quite a bit different than the original
gerbers from CoreWeaver.? I am in the process of finishing my
CoreWeaver design now.? I like your layout a lot better than
CoreWeaver's!
Thank you.
Jim Pruitt
WA7DUY
On 3/24/2022 4:04 PM, Bruce Hall wrote:
toggle quoted message
Show quoted text
I recently built an LC meter that is based on the
famous?AADE design.? If you are interested, please check out the
links below.
Many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Part
1: Builder¡¯s Guide:
Part
2: Software Review (pending)
Part
3: User¡¯s Guide (pending)
Full
Source Code:?
Test
Sketches:?
Schematic:?
Interactive
BOM:?
PCB
Gerbers:
|
I recently built an LC meter that is based on the famous?AADE design.? If you are interested, please check out the links below.
Many thanks to Ken KM4NFQ for reviewing the documentation.
Bruce
Part 1: Builder¡¯s Guide:
Part 2: Software Review (pending)
Part 3: User¡¯s Guide (pending)
Full Source Code:?
Test Sketches:?
Schematic:?
Interactive BOM:?
PCB Gerbers:
|
Hello all,
I built the ESP32 version of the Morse Tutor. It is fantastic except for one little thing. I keep having issues with it adding elements to a string. If I hold down the dit side of my paddle it will occasionally throw a dah in the string of dits and the dah side is similar. I only have one paddle that I hombrewed out of copper clad board, so I can't switch paddles, but the paddles do not behave that way in any other device. Has anyone seen this previously?
Regards
Mateo
|
Hello Jim WA7DUY, Attached is a snapshot of my coreWeaver LC Meter (running W8BH's LC Meter source code). I did not have too much trouble getting the CC capacitor to fit... I just bent the leads slightly. I got one lead soldered, then adjusted the other lead so the cap was as even as I could get. I have alligator clips on short pieces of wire soldered to M1 and M2, used as test leads. I also made a simple test socket with copper-clad board and a female header. The alligator clips attach to each side of the socket, on loops. This makes it easier for me to test a bunch of caps, whatever. MY "3D enclosure" is an old cardboard battery box, labeled "LC Meter". It keeps the dust and stray resistor clippings off the LC Meter when it is not in use. I take it out of the battery box to use it, and put it back in the box when I'm finished. I do not have easy access to a 3D printer, so I am not going to 3D print an enclosure for my LC Meter. Many of my pieces of test equipment were built from kits, and no not have enclosures. They are kept in a box until I need them. That is the path of least resistance, for me. Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutor
On Thu, Mar 3, 2022 at 5:40 AM Jim Pruitt <jpruitt67@...> wrote:
What are CoreWeaver/W8BH LC meter builders using for LED's? Are the 3mm or are they 5mm?
Also, has anyone had trouble getting the CC capacitor to fit the footprint? What did you do? Did you just spread the capacitor wires more?
What are you using for the M1 and M2 pins? What are you using for the test leads or test sockets?
Has anyone laid out a 3D case for this and made it yet?
Thank you.
Jim Pruitt
WA7DUY
On 2/12/2022 4:47 AM, Bruce Hall wrote:
Bruce
w8bh.net
On Fri, Feb 11, 2022 at 10:06 AM Ken KM4NFQ <km4nfq@...> wrote:
Hello Jim WA7DUY,
I guess I was lucky to find the relays in stock.
I have ordered from Newark before, although it was many years ago.
You just have to go with the distributor that carries the part.
I suggest that you order as many parts from one distributor as you can
to save on S&H.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
On Fri, Feb 11, 2022 at 2:23 AM Jim Pruitt <jpruitt67@...> wrote:
Hello Ken.
I bought the Coto relay from Mouser because they showed no stock on the Sil05-1A7271L and the Sil05-1A7271D relays. Both Mouser and Digikey list the NA05WK 5v DPTD relay as obsolete and no longer available but their searches gave no alternatives.
I have no objection to using a 560 ohm resistor instead of the 540 ohm called out in the parts list. I thought 540 was an odd value anyway but thought it might be a standard 1% value but apparently not. My guess is that the 540 ohm value is the mathematical calculation to get the desired 3.3v out of the LM317LZ with the 330 ohm that they used in the divider and just verified that with the LM317 calculator at:
If 560 is substituted for R2 instead of 540 then R1 comes out at 340 ohms (another non standard value). With R1 at 330 ohms and R2 at 560 ohms then LM317 should deliver 3.7v.
Any suggestions on the DPDT 5v relay substitute of the Fujitsu NA05WK is not available and is in fact obsolete? I do see that Newark has some of the Sil05-7271L single inline relays in stock.
Thank you.
Jim Pruitt
WA7DUY
On 2/10/2022 7:11 PM, Ken KM4NFQ wrote:
Hello Jim WA7DUY,
Some parts were difficult for ME to find.
I do not know if any of these parts are still in stock at Mouser Electronics?
The datasheets should still be available for substitution purposes.
Reed Relay
Mouser P/N: 876-SIL05-1A7271L
Takamisawa NA5W-K Relay
Mouser P/N: 817-NA-5W-K
1000pF Capacitor
Mouser P/N: 80-PFR5102F100J11L4B
(Check the spacing of the capacitor leads against the PCB holes before
ordering.)
1000pF Capacitor
Mouser P/N: 75-KP1830210631
(Check the spacing of the capacitor leads against the PCB holes before
ordering.)
Crystal 8MHz
Mouser P/N: 559-FC4STCBMF80B2
LM317 Linear Voltage Regulator
Mouser P/N: 595-LM317LCLPRE3
LM311N Voltage Comparator
Mouser P/N: 926-LM311N/NOPB
BAT42 Scottky Diode
Mouser P/N: 511-BAT42
As Bruce suggested, I used a 560 Ohm resistor in place of the 540 Ohm resistor.
Hopefully helpful.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
On Thu, Feb 10, 2022 at 5:19 PM Jim Pruitt <jpruitt67@...> wrote:
Hello Ken (KN4NFQ) and Bruce (W8BH).
I was able to find the schematic and parts list on CoreWeaver's github page. Thank you. Now I have a few other questions for you and Bruce and anyone else that built it.
Where did you find the 540 ohm resistor CoreWeaver used to set the LM317LZ output voltage? I can not find that value as a standard value for 5% or 1% resistors. Only Digikey listed a single 540 ohm ? watt 1% resistor and no stock and required 1000 minimum order and 90 cents per resistor at that quantity! Should it actually be the standard 560 ohms? I also question why he used an LM317LZ instead of one of the 3.3 volt LDO regulators. Does anyone know? I assume (yes I know what they say about that) that it was because that was what he had in his junkbox but that is only a guess. Did anyone happen to use one of the TO92 footprint 3.3v ldo's there instead of the LM317?
Also I did not find any SIL 7271-L 5 volt reed relays but bought a Coto 2101 with diode. The footprint is the same but the datasheet does not help me with orientation. The relay is symmetrical and datasheet does not indicate polarity but with a diode across it I would think it would have to follow the correct voltage polarity. What did others use?
Thank you.
Jim Pruitt
WA7DUY
|
What are CoreWeaver/W8BH LC meter builders using
for LED's?? Are the 3mm or are they 5mm?
Also,? has anyone had trouble getting the CC capacitor to fit the
footprint?? What did you do? Did you just spread the capacitor
wires more?
What are you using for the M1 and M2 pins?? What are you using for
the test leads or test sockets?
Has anyone laid out a 3D case for this and made it yet?
Thank you.
Jim Pruitt
WA7DUY
On 2/12/2022 4:47 AM, Bruce Hall wrote:
toggle quoted message
Show quoted text
On Fri, Feb 11, 2022 at
10:06 AM Ken KM4NFQ < km4nfq@...>
wrote:
Hello Jim WA7DUY,
I guess I was lucky to find the relays in stock.
I have ordered from Newark before, although it was many
years ago.
You just have to go with the distributor that carries the
part.
I suggest that you order as many parts from one distributor
as you can
to save on S&H.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
On Fri, Feb 11, 2022 at 2:23 AM Jim Pruitt <jpruitt67@...>
wrote:
>
> Hello Ken.
>
> I bought the Coto relay from Mouser because they showed
no stock on the Sil05-1A7271L and the Sil05-1A7271D relays.?
Both Mouser and Digikey list the NA05WK 5v DPTD relay as
obsolete and no longer available but their searches gave no
alternatives.
>
> I have no objection to using a 560 ohm resistor instead
of the 540 ohm called out in the parts list.? I thought 540
was an odd value anyway but thought it might be a standard
1% value but apparently not.? My guess is that the 540 ohm
value is the mathematical calculation to get the desired
3.3v out of the LM317LZ with the 330 ohm that they used in
the divider and just verified that with the LM317 calculator
at:
>
> If 560 is substituted for R2 instead of 540 then R1
comes out at 340 ohms (another non standard value). With R1
at 330 ohms and R2 at 560 ohms then LM317 should deliver
3.7v.
>
> Any suggestions on the DPDT 5v relay substitute of the
Fujitsu NA05WK is not available and is in fact obsolete?? I
do see that Newark has some of the Sil05-7271L single inline
relays in stock.
>
> Thank you.
>
> Jim Pruitt
> WA7DUY
>
>
> On 2/10/2022 7:11 PM, Ken KM4NFQ wrote:
>
> Hello Jim WA7DUY,
>
> Some parts were difficult for ME to find.
> I do not know if any of these parts are still in stock
at Mouser Electronics?
> The datasheets should still be available for
substitution purposes.
>
> Reed Relay
> Mouser P/N: 876-SIL05-1A7271L
>
> Takamisawa NA5W-K Relay
> Mouser P/N: 817-NA-5W-K
>
> 1000pF Capacitor
> Mouser P/N: 80-PFR5102F100J11L4B
> (Check the spacing of the capacitor leads against the
PCB holes before
> ordering.)
>
> 1000pF Capacitor
> Mouser P/N: 75-KP1830210631
> (Check the spacing of the capacitor leads against the
PCB holes before
> ordering.)
>
> Crystal 8MHz
> Mouser P/N: 559-FC4STCBMF80B2
>
> LM317 Linear Voltage Regulator
> Mouser P/N: 595-LM317LCLPRE3
>
> LM311N Voltage Comparator
> Mouser P/N: 926-LM311N/NOPB
>
> BAT42 Scottky Diode
> Mouser P/N: 511-BAT42
>
> As Bruce suggested, I used a 560 Ohm resistor in place
of the 540 Ohm resistor.
>
> Hopefully helpful.
>
> Regards,
> Ken, KM4NFQ "Not Fully Qualified"
> /g/w8bhMorseTutor
>
>
> On Thu, Feb 10, 2022 at 5:19 PM Jim Pruitt <jpruitt67@...>
wrote:
>
> Hello Ken (KN4NFQ) and Bruce (W8BH).
>
> I was able to find the schematic and parts list on
CoreWeaver's github page.? Thank you.? Now I have a few
other questions for you and Bruce and anyone else that built
it.
>
> Where did you find the 540 ohm resistor CoreWeaver used
to set the LM317LZ output voltage?? I can not find that
value as a standard value for 5% or 1% resistors.? Only
Digikey listed a single 540 ohm ? watt 1% resistor and no
stock and required 1000 minimum order and 90 cents per
resistor at that quantity!? Should it actually be the
standard 560 ohms?? I also question why he used an LM317LZ
instead of one of the 3.3 volt LDO regulators. Does anyone
know?? I assume (yes I know what they say about that) that
it was because that was what he had in his junkbox but that
is only a guess.? Did anyone happen to use one of the TO92
footprint 3.3v ldo's there instead of the LM317?
>
> Also I did not find any SIL 7271-L 5 volt reed relays
but bought a Coto 2101 with diode.? The footprint is the
same but the datasheet does not help me with orientation.?
The relay is symmetrical? and datasheet does not indicate
polarity but with a diode across it I would think it would
have to follow the correct voltage polarity.? What did
others use?
>
> Thank you.
>
> Jim Pruitt
> WA7DUY
>
>
>
>
|
Jerry, I would like a case like yours for my ESP32 Morse Tutor and before I start laying one out with SCAD, I was wondering if the STLs and/or the design files for your case were ever posted anywhere?
|
toggle quoted message
Show quoted text
On Fri, Feb 11, 2022 at 10:06 AM Ken KM4NFQ < km4nfq@...> wrote: Hello Jim WA7DUY,
I guess I was lucky to find the relays in stock.
I have ordered from Newark before, although it was many years ago.
You just have to go with the distributor that carries the part.
I suggest that you order as many parts from one distributor as you can
to save on S&H.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
On Fri, Feb 11, 2022 at 2:23 AM Jim Pruitt <jpruitt67@...> wrote:
>
> Hello Ken.
>
> I bought the Coto relay from Mouser because they showed no stock on the Sil05-1A7271L and the Sil05-1A7271D relays.? Both Mouser and Digikey list the NA05WK 5v DPTD relay as obsolete and no longer available but their searches gave no alternatives.
>
> I have no objection to using a 560 ohm resistor instead of the 540 ohm called out in the parts list.? I thought 540 was an odd value anyway but thought it might be a standard 1% value but apparently not.? My guess is that the 540 ohm value is the mathematical calculation to get the desired 3.3v out of the LM317LZ with the 330 ohm that they used in the divider and just verified that with the LM317 calculator at:
>
> If 560 is substituted for R2 instead of 540 then R1 comes out at 340 ohms (another non standard value). With R1 at 330 ohms and R2 at 560 ohms then LM317 should deliver 3.7v.
>
> Any suggestions on the DPDT 5v relay substitute of the Fujitsu NA05WK is not available and is in fact obsolete?? I do see that Newark has some of the Sil05-7271L single inline relays in stock.
>
> Thank you.
>
> Jim Pruitt
> WA7DUY
>
>
> On 2/10/2022 7:11 PM, Ken KM4NFQ wrote:
>
> Hello Jim WA7DUY,
>
> Some parts were difficult for ME to find.
> I do not know if any of these parts are still in stock at Mouser Electronics?
> The datasheets should still be available for substitution purposes.
>
> Reed Relay
> Mouser P/N: 876-SIL05-1A7271L
>
> Takamisawa NA5W-K Relay
> Mouser P/N: 817-NA-5W-K
>
> 1000pF Capacitor
> Mouser P/N: 80-PFR5102F100J11L4B
> (Check the spacing of the capacitor leads against the PCB holes before
> ordering.)
>
> 1000pF Capacitor
> Mouser P/N: 75-KP1830210631
> (Check the spacing of the capacitor leads against the PCB holes before
> ordering.)
>
> Crystal 8MHz
> Mouser P/N: 559-FC4STCBMF80B2
>
> LM317 Linear Voltage Regulator
> Mouser P/N: 595-LM317LCLPRE3
>
> LM311N Voltage Comparator
> Mouser P/N: 926-LM311N/NOPB
>
> BAT42 Scottky Diode
> Mouser P/N: 511-BAT42
>
> As Bruce suggested, I used a 560 Ohm resistor in place of the 540 Ohm resistor.
>
> Hopefully helpful.
>
> Regards,
> Ken, KM4NFQ "Not Fully Qualified"
> /g/w8bhMorseTutor
>
>
> On Thu, Feb 10, 2022 at 5:19 PM Jim Pruitt <jpruitt67@...> wrote:
>
> Hello Ken (KN4NFQ) and Bruce (W8BH).
>
> I was able to find the schematic and parts list on CoreWeaver's github page.? Thank you.? Now I have a few other questions for you and Bruce and anyone else that built it.
>
> Where did you find the 540 ohm resistor CoreWeaver used to set the LM317LZ output voltage?? I can not find that value as a standard value for 5% or 1% resistors.? Only Digikey listed a single 540 ohm ? watt 1% resistor and no stock and required 1000 minimum order and 90 cents per resistor at that quantity!? Should it actually be the standard 560 ohms?? I also question why he used an LM317LZ instead of one of the 3.3 volt LDO regulators. Does anyone know?? I assume (yes I know what they say about that) that it was because that was what he had in his junkbox but that is only a guess.? Did anyone happen to use one of the TO92 footprint 3.3v ldo's there instead of the LM317?
>
> Also I did not find any SIL 7271-L 5 volt reed relays but bought a Coto 2101 with diode.? The footprint is the same but the datasheet does not help me with orientation.? The relay is symmetrical? and datasheet does not indicate polarity but with a diode across it I would think it would have to follow the correct voltage polarity.? What did others use?
>
> Thank you.
>
> Jim Pruitt
> WA7DUY
>
>
>
>
|
Hello Jim WA7DUY, I guess I was lucky to find the relays in stock. I have ordered from Newark before, although it was many years ago. You just have to go with the distributor that carries the part. I suggest that you order as many parts from one distributor as you can to save on S&H. Regards, Ken, KM4NFQ "Not Fully Qualified" /g/w8bhMorseTutor
On Fri, Feb 11, 2022 at 2:23 AM Jim Pruitt <jpruitt67@...> wrote:
Hello Ken.
I bought the Coto relay from Mouser because they showed no stock on the Sil05-1A7271L and the Sil05-1A7271D relays. Both Mouser and Digikey list the NA05WK 5v DPTD relay as obsolete and no longer available but their searches gave no alternatives.
I have no objection to using a 560 ohm resistor instead of the 540 ohm called out in the parts list. I thought 540 was an odd value anyway but thought it might be a standard 1% value but apparently not. My guess is that the 540 ohm value is the mathematical calculation to get the desired 3.3v out of the LM317LZ with the 330 ohm that they used in the divider and just verified that with the LM317 calculator at:
If 560 is substituted for R2 instead of 540 then R1 comes out at 340 ohms (another non standard value). With R1 at 330 ohms and R2 at 560 ohms then LM317 should deliver 3.7v.
Any suggestions on the DPDT 5v relay substitute of the Fujitsu NA05WK is not available and is in fact obsolete? I do see that Newark has some of the Sil05-7271L single inline relays in stock.
Thank you.
Jim Pruitt
WA7DUY
On 2/10/2022 7:11 PM, Ken KM4NFQ wrote:
Hello Jim WA7DUY,
Some parts were difficult for ME to find.
I do not know if any of these parts are still in stock at Mouser Electronics?
The datasheets should still be available for substitution purposes.
Reed Relay
Mouser P/N: 876-SIL05-1A7271L
Takamisawa NA5W-K Relay
Mouser P/N: 817-NA-5W-K
1000pF Capacitor
Mouser P/N: 80-PFR5102F100J11L4B
(Check the spacing of the capacitor leads against the PCB holes before
ordering.)
1000pF Capacitor
Mouser P/N: 75-KP1830210631
(Check the spacing of the capacitor leads against the PCB holes before
ordering.)
Crystal 8MHz
Mouser P/N: 559-FC4STCBMF80B2
LM317 Linear Voltage Regulator
Mouser P/N: 595-LM317LCLPRE3
LM311N Voltage Comparator
Mouser P/N: 926-LM311N/NOPB
BAT42 Scottky Diode
Mouser P/N: 511-BAT42
As Bruce suggested, I used a 560 Ohm resistor in place of the 540 Ohm resistor.
Hopefully helpful.
Regards,
Ken, KM4NFQ "Not Fully Qualified"
/g/w8bhMorseTutor
On Thu, Feb 10, 2022 at 5:19 PM Jim Pruitt <jpruitt67@...> wrote:
Hello Ken (KN4NFQ) and Bruce (W8BH).
I was able to find the schematic and parts list on CoreWeaver's github page. Thank you. Now I have a few other questions for you and Bruce and anyone else that built it.
Where did you find the 540 ohm resistor CoreWeaver used to set the LM317LZ output voltage? I can not find that value as a standard value for 5% or 1% resistors. Only Digikey listed a single 540 ohm ? watt 1% resistor and no stock and required 1000 minimum order and 90 cents per resistor at that quantity! Should it actually be the standard 560 ohms? I also question why he used an LM317LZ instead of one of the 3.3 volt LDO regulators. Does anyone know? I assume (yes I know what they say about that) that it was because that was what he had in his junkbox but that is only a guess. Did anyone happen to use one of the TO92 footprint 3.3v ldo's there instead of the LM317?
Also I did not find any SIL 7271-L 5 volt reed relays but bought a Coto 2101 with diode. The footprint is the same but the datasheet does not help me with orientation. The relay is symmetrical and datasheet does not indicate polarity but with a diode across it I would think it would have to follow the correct voltage polarity. What did others use?
Thank you.
Jim Pruitt
WA7DUY
|
Ken KM4NFQ
Bruce Hall
Bill AG5ZN
