Re: Conflicting information
For me, it's a bad-habit thing. If I get used to having two power sources connected, some day, just as sure as I"m sitting here, I'm going to plug in two power sources and get a min-Fourth of July show as I watch the magic white smoke that runs all electronic devices evaporate in front of me. I just think that, unless explicit told to do so, I just prefer to have a single power source.
Jack, W8TEE
From: davemrtn <davemrtn@...>
To: [email protected]
Sent: Thursday, June 1, 2017 8:33 AM
Subject: Re: [BITX20] Conflicting information
Actually, I don't think it
will have any effect on the computer usb port.
The reason it would not harm
the usb port is defined in the Arduino Nano schematic...
Look at the schematic -?
The Nano has this magic little 'check valve' called
a diode.
David Martin - - Mountain
Home, Ar.
-----------------------------------------
Everybody complains about CO2, but nobody complains about all
the trees cut down to build Highways and Cities.
Recycle, Reuse, Re-purpose, Repair
On 6/1/2017 01:07, Dr Fred Hambrecht
wrote:
It
should not be done.? Putting two sources in parallel that
may be at a different potential is never a good idea. While
it may ?or may not hurt the BITX, it could play hell with
the computer USB port.
?
v/r
Fred
W4JLE
?
?
Thanks! Powering something from 2 sources
simultaneously scares me as I already
blew up an expensive gimmick that way!
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Re: Handheld Mic w/ PTT for BITX40
This is the info I have found for wiring up the mic , any info on how you wired up would be great!  Thanks? 73 Chris VA7XZZ
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Re: Handheld Mic w/ PTT for BITX40
HI Ryan,
How did this go with the HM36 mic? I bought the same one along with the 8 pin chassis mount. Do you have any advise or wiring diagrams for this?
Thanks
Chris VA7XZZ
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Re: Conflicting information
In addition to both Arduino's documentation and schematic stating that running ?A USB and external power simultaneously is supported, there are hundreds, if not thousands, of commercial products using Arduino microcontrollers that optionally provide two sources of power to the Arduino.? Any RepRap based 3D printer (a vast majority of the kits and pre-built printers for hobbyist use) use an Arduino-based bored as the controller, if not an Arduino Mega and RAMPS board directly.? The Shapeoko CNC mill also does this.? If you think about it, everything from printers to external hard drives use an external power source when connected to USB.
If you are concerned about a cheap Arduino clone damaging your computers USB port, plug it in to a powered hub.? Worst case, the USB hub will sacrifice itself.
I've heard the anecdotes about things breaking. My anecdotes are that I've upgraded both my Raduinos 5 or 6 times while powered on, use my 3d printer with external and USB power all the time, and have built dozens of stand-alone Arduino projects that use the USB serial connection for debugging, all without ever blowing anything up.
I'm hoping that we can get past this issue as a community.? Imagine CAT control of a BitX for digital modes!? There is already an FT817 library for controlling a radio from an Arduino, so it shouldn't be too terrible to make it work the other way, assuming there is enough memory, etc...? I plan to take a shot at this when life slows down, but at the rate it's going it could be a while :-)
Anyway, thanks for reading if you made it this far.
73, KE0KKM
On Jun 1, 2017 7:33 AM, "davemrtn" < davemrtn@...> wrote:
Actually, I don't think it
will have any effect on the computer usb port.
The reason it would not harm
the usb port is defined in the Arduino Nano schematic...
Look at the schematic -?
The Nano has this magic little 'check valve' called
a diode.
David Martin - - Mountain
Home, Ar.
-----------------------------------------
Everybody complains about CO2, but nobody complains about all
the trees cut down to build Highways and Cities.
Recycle, Reuse, Re-purpose, Repair
On 6/1/2017 01:07, Dr Fred Hambrecht
wrote:
It
should not be done.? Putting two sources in parallel that
may be at a different potential is never a good idea. While
it may ?or may not hurt the BITX, it could play hell with
the computer USB port.
?
v/r
Fred
W4JLE
?
From:
[email protected] [mailto:[email protected]] On Behalf Of
John P
Sent: Wednesday, May 31, 2017 17:54
To: [email protected]
Subject: Re: [BITX20] Conflicting information
?
Thanks! Powering something from 2 sources
simultaneously scares me as I already
blew up an expensive gimmick that way!
|
Re: Conflicting information
Actually, I don't think it
will have any effect on the computer usb port.
The reason it would not harm
the usb port is defined in the Arduino Nano schematic...
Look at the schematic -?
The Nano has this magic little 'check valve' called
a diode.
David Martin - - Mountain
Home, Ar.
-----------------------------------------
Everybody complains about CO2, but nobody complains about all
the trees cut down to build Highways and Cities.
Recycle, Reuse, Re-purpose, Repair
On 6/1/2017 01:07, Dr Fred Hambrecht
wrote:
toggle quoted message
Show quoted text
It
should not be done.? Putting two sources in parallel that
may be at a different potential is never a good idea. While
it may ?or may not hurt the BITX, it could play hell with
the computer USB port.
?
v/r
Fred
W4JLE
?
From:
[email protected] [mailto:[email protected]] On Behalf Of
John P
Sent: Wednesday, May 31, 2017 17:54
To: [email protected]
Subject: Re: [BITX20] Conflicting information
?
Thanks! Powering something from 2 sources
simultaneously scares me as I already
blew up an expensive gimmick that way!
|
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I look on ebay and don't have a lot of luck with that. Hopefully someone
else will have a good source.
Vince - KA8CSH
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Show quoted text
How can I get a good gt37-43, could you help me with this?
--
Michigan VHF Corp.
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Lots more info and articles here!
In the last 40+ years I have tried photodiode, fet, ldr and even the NE570.
I still have one of my variable DBX units!
toggle quoted message
Show quoted text
At 01/06/2017, you wrote: From NUTS and VOLTS
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How can I get a good gt37-43, could you help me with this?
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How can I get a good t50-37, could you help me with this?
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According to toroids.info 8 turns on a T50-37 core is 28.16uH. To get 28.16uH on a T50-2 core you'd need 76 turns. Thanks Bill Meara, lm386 I will check, I live in turkey, t50-2 I use
thyroid, 73
Vince. -- Michigan VHF Corp.
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Thanks Bill Meara, lm386 I will check, I live in turkey, t50-2 I use thyroid, 73
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Your BITX 20 board looks very nice.?? If you are hearing a whistling sound on receive, your audio amplifier might be oscillating.? Check the grounding on the LM386.?
One other thing I notice from the photo:? I like your toroidal coils and I often use insulated wire as you have done.? But you wound the coils on red T-50-2 cores.?? I think you need ferrite cores that will result in higher inductance.? Type 43 material is usually used.?? If you need some, I can send some to you (Farhan gave me a bunch of these).? Let me know.?? (Where are you?0
Don't give up!? You are close to getting a wonderful rig on the air.
73? Bill N2CQR
On Thursday, June 1, 2017 6:10 AM, huseyin.guner via Groups.Io <huseyin.guner@...> wrote:
Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem.Nobin was wrapped with 8 rounds t50-2 
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Hi, I decided to do Bitx20, I use 10 MHz xtal, card is over and I get energy, whistling, what could be the problem.Nobin was wrapped with 8 rounds t50-2 
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complete link:
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Show quoted text
----- Original Message ----- From: "Allard PE1NWL" <pe1nwl@...> To: [email protected]Sent: Thursday, 1 June, 2017 11:06:17 Subject: Re: [BITX20] Constant volume/AGC that link seems to be broken... On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote: please have a loog on
www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf
Henning
DK5LV
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I copied this link from Google, after inserting qex Audio agc
the full article is named:
synthesing an Audio AGC circuit
Phil Andedrson W0XI
published in the QEX Sept Oct 2010
Henning
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Show quoted text
----- Original Message ----- From: "Allard PE1NWL" <pe1nwl@...> To: [email protected]Sent: Thursday, 1 June, 2017 11:06:17 Subject: Re: [BITX20] Constant volume/AGC that link seems to be broken... On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote: please have a loog on
www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf
Henning
DK5LV
|
that link seems to be broken...
toggle quoted message
Show quoted text
On Thu, June 1, 2017 10:58, Henning Weddig via Groups.Io wrote: please have a loog on
www.arrl.org/files/file/QEX...Oct.../Anderson%20Sept-Oct.pdf
Henning
DK5LV
|
please have a loog on
Henning
DK5LV
Am 01.06.2017 um 09:58 schrieb Ashhar
Farhan:
toggle quoted message
Show quoted text
this can be done much easier with a 2N7000 as it
doesn't need -ve bias of the JFET. I don't know if you have seen
the AGC circuit in the BITX hacks
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Another easy way out, we investigated it for BITX boards as well, is to use fulfillment by amazon (FBA for amazon citizens).
- f
On Thu, Jun 1, 2017 at 4:07 AM, William R Maxwell <wrmaxwell@...> wrote:
I would be happy to
hold some local stock and then handle orders from Australia
and say New Zealand or other Pacific destinations at cost. The
Australian Customs declaration is relatively simple and can be
hand-filled, with the Post Office happy to give me a supply of
blank forms.
I have handled a
number of international group purchases this way.
Bill, VK7MX
On 1/06/2017 7:47 AM, Jack Purdum via
Groups.Io wrote:
These are good
ideas. I'll investigate this further...thanks!!
Jack, W8TEE
Jack,
a couple of thoughts,
1) put your design on oshpark as a shared project.
Others could then order (in multiples of three) at a
reasonable price.
2) contact Hans Summer G0UPL ( I seem to recall he
is a member of this group) who runs
he may have some good ideas on how to better do what
you are trying to do.
Either way, your commitment to providing these
boards at a reasonable cost is commendable
Cheers, Graham ve3gtc
On
2017-05-31 19:30, Jack Purdum via Groups.Io wrote:
All:
I just
spent an hour at the post office while they
processed each foreign order. Last night I
spent another several hours filling out
export/customs forms. Potentially, each
country charges a different amount on
packages to their country. Because the PCB
"cannot be bent during processing", it has
to be sent parcel post, rather than first
class mail, which is much more standardized.
The cheapest rate was over $9 to Canada and
the most expensive were several European
countries just under $15! I was stunned. I
still sent the packages, but everyone in
Europe only has a $2.62 credit as that's
what I assumed the charge would be plus a
little more. I told people read the postage
cost on the outside and remit that amount
less $2.62 since you've already paid that.
In most cases, that make the board stupidly
expensive.
If
the European Union has one rate for parcels,
my solution is to sell a bunch of boards to
one place in the Union and let people order
from them. Same for the Pacific Rim. Another
solution is to find someone who likes
waiting in post offices and filling out
forms and let them handle the foreign
orders. The third alternative is to not take
foreign orders, but that's unacceptable to
me.?
So, if
you have some great idea for solving this
problem, please write me off-line so we
don't chew up bandwidth here. I'm good in
QRZ.com. If something looks like it will
work, I'll inform the group.
Also,
I'll post to the group when the new shipment
of boards comes in.
Jack,
W8TEE
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Raj vu2zap
Allard PE1NWL
?