Re: Freshwater Soundscapes...
Thanks, Heinz. Very interesting!
I watched an interesting?BioacousTalk today. It has nothing to do with MicBuilding, but can be inspiring for hydrophone builders and musicians.
It's mainly about?
Have fun!
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Freshwater Soundscapes...
I watched an interesting?BioacousTalk today.?It has nothing to do with MicBuilding, but can be inspiring for hydrophone builders, bio-acoustics researchers and musicians alike. It's mainly about?
Have fun!
|
Not sure where you can buy original elements, except maybe a CB shop. There is a Ham radio operator, W2ENY, sells replacement kits using an Electret element on Ebay. You can google W2ENY and find his website. A more interesting solution maybe W9AC who designed a replacement board, which is available on Oshpark. I googled W9AC D104 and found several documents on his board.
Dave
k4em
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Any replacement elements for the Astatic D104 microphone?
Bill
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Re: Schoeps CCM disassembly
Thanks. Tried to open it but no dice. Don't want to risk and heat the glue to lighten the grip.
This is more problematic than I expected. Will forward to the proper service company then.
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Re: Schoeps CCM disassembly
It¡®s reverse-threaded and glued
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I have a CCM4 mic that seems to have a bad contact or cold solder joint inside between the Lemo connector and internal PCB. Does anybody know how to disassemble this mic?
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On Mon, Mar 18, 2024 at 02:34 PM, "Alex" <alexmiminoshvili@...> wrote:
Hey guys, is it possible to get Gerber files from this?
I want to order this PCB on another site. I can send website fees directly to the designers, if you are reading this.
?I think the answer can be found in this thread :?/g/MicBuilders/topic/94967502
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Well, after a massive delay I've managed to get my first board populated. I tested it with two identical piezo elements (as I've had no joy in sourcing cylinders in the UK yet). One element went through the buffer and the other was routed through a HOSA MIT-129 impedance convertor I bought along with a JrF C series contact mic. The difference between the two is astounding. And this is despite me completely missing the note about having C6&7 as close to the OPA pins as possible... I had a bit of a mare assembling the boards as it seems the paste I have is EOL and despite thinning it with flux it was spitting and popping the passives off the board all the time. I'll have to wait for a new batch of paste before I can assemble more, as constantly finding where the tiny passives went was extremely annoying.
As a side note, is R10 the main element providing the Z matching? Is it worth playing with this value? Another query relates to the elements used. I had some 15mm piezos that I had in a parts bin. Is it the size of these or the impedance that affects the sensitivity?
I'll post some wavs when I get to doing some more testing, but for now I'm waiting for the plasti dip that I dipped the element in to set.
[Edited Message Follows]
I was asking Adrian, but if you're working on this as well, great! I'll look forward to your build video and this new project.
By the way, I finally got a chance to test out my new hydrophones yesterday and no hum. After Mother's day lunch we went to the St Clair river below the Blue Water bridge and I managed to catch the freighter "American Spirit" as she headed up-bound into Lake Huron. I recorded the surface sound of the waves lashing the shoreline on two tracks, and the underwater sounds on another two tracks.
The hum is definitely gone now with this new set, but there are periodic pops and thumps which look like some kind of spike on the waveform. I manually removed them in Soundforge. Maybe just a property of piezo pickups.
I'll link to the audio when I get a chance.
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I have an SMD version that I designed. The link you have goes to a member?of the group so hopefully he will respond. I designed?the circuit and released that part as open source CCC. WIth that said, my PCB designs?I prefer to sell through PCBWay. It gives me just enough?revenue to order?boards?lol.?
Jules
Hey guys, is it possible to get Gerber files from this?
I want to order this PCB on another site. I can send website fees directly to the designers, if you are reading this.
-- Best Regards,
Jules Ryckebusch
214 399 0931
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Re: Strange Simple P48 readings
On Sun, Mar 17, 2024 at 11:20 AM, Adrian Hicks wrote:
So, am I correct in thinking that this is basically a resistor divider? With the FET being one of the resistances in the system?
Sort of, but that's an incomplete explanation.
Would I measure the resistance across the capsule in order to get the third value?
NO. The FET in the capsule is part of an active circuit; you can't just "measure the resistance" with an ohmmeter across the pins of a capsule.
?I've probably just opened a can of worms for myself by trying to optimise something that has worked for years, but I suppose it is all good learning.
It's both. The simpleP48 document is both a foolproof recipe, and a pretty good explanation of how it works. To get more into it, you could read up on .
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Hey guys, is it possible to get Gerber files from this?
I want to order this PCB on another site. I can send website fees directly to the designers, if you are reading this.
|
Re: Strange Simple P48 readings
Look at the DC path from Ground up through the external resistor, the FET then Pin3, the 6.8K resistor to the 48V. Without the capsule there is no circuit path. With the FET biased correctly, you have 5-7 volts across?it. Please see Ricardo's P48 document. It explains this. The only real thing to "optimize" is the external resistor?value specific to the internal FET of the Capsule. If you are using a PUI or Primo, that has already been optimized and is in the document.? 
On Sun, Mar 17, 2024 at 1:20?PM Adrian Hicks < mail@...> wrote: So, am I correct in thinking that this is basically a resistor divider? With the FET being one of the resistances in the system? I'm not sure where you get the 48v and 24v results from. Would I measure the resistance across the capsule in order to get the third value? I'm just keen not to blow the caps. I've probably just opened a can of worms for myself by trying to optimise something that has worked for years, but I suppose it is all good learning.
The capsule FET was integral to this. Otherwise you are measuring 48volts supplied by the 6.8K resistor (internal to the preamp) in series with the external P48 resistor. If you go to 1M you will be close to 48 volts ?at 6.8K you will be 24 volts. Make sense? Best Regards,
Jules Ryckebusch? On Mar 17, 2024, at 12:44, Adrian Hicks <mail@...> wrote:
? I haven't connected the capsule for fear of blowing it. I'm guessing herein lies my problem?
But where is the capsule connected?
Le 17/03/2024 ¨¤ 18:30, Adrian Hicks a
¨¦crit?:
I don't know of an easy way of drawing a schematic
on my phone but I did take a picture of the breadboard when I
was fiddling at home earlier.?
RGB corresponds to 123
The DMM? is hooked up to the black probe on the
leg of R1 and to the red wire on pin 3.
I hope that makes more sense?
Can you draw a schematic? Your description is hard to
figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a ¨¦crit?:
A few years back I bought some EM172s to
use with my Zoom H5.
More recently I've been lucky enough to
pick up a lightly used MixPre6ii. I've been using the
172s with no problems, but thought I would go back and
check the R value to make sure it was optimised for
the MP.
I soldered an XLR to some header pins to
make it easier to test things on a breadboard and was
alarmed at the results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve
terminal on the mic
The -ve cap lead goes to the other
resistor terminal.
I? played with values of R until going
all the way to 1MOhm which gives a reading of 7-8v
which fluctuates a lot.
As a side note with the negative lead of
the cap connected to pin 2 V was ~34v so I sawpped it
to be positive to pin 2
This doesn't seem to be even remotely
close to the previous results in the PDF that Richard
Lee created.?
?Am I missing something?
-- Best Regards,
Jules Ryckebusch
214 399 0931
|
Re: Strange Simple P48 readings
So, am I correct in thinking that this is basically a resistor divider? With the FET being one of the resistances in the system? I'm not sure where you get the 48v and 24v results from. Would I measure the resistance across the capsule in order to get the third value? I'm just keen not to blow the caps. I've probably just opened a can of worms for myself by trying to optimise something that has worked for years, but I suppose it is all good learning.
The capsule FET was integral to this. Otherwise you are measuring 48volts supplied by the 6.8K resistor (internal to the preamp) in series with the external P48 resistor. If you go to 1M you will be close to 48 volts ?at 6.8K you will be 24 volts. Make sense? Best Regards,
Jules Ryckebusch? On Mar 17, 2024, at 12:44, Adrian Hicks <mail@...> wrote:
? I haven't connected the capsule for fear of blowing it. I'm guessing herein lies my problem?
But where is the capsule connected?
Le 17/03/2024 ¨¤ 18:30, Adrian Hicks a
¨¦crit?:
I don't know of an easy way of drawing a schematic
on my phone but I did take a picture of the breadboard when I
was fiddling at home earlier.?
RGB corresponds to 123
The DMM? is hooked up to the black probe on the
leg of R1 and to the red wire on pin 3.
I hope that makes more sense?
Can you draw a schematic? Your description is hard to
figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a ¨¦crit?:
A few years back I bought some EM172s to
use with my Zoom H5.
More recently I've been lucky enough to
pick up a lightly used MixPre6ii. I've been using the
172s with no problems, but thought I would go back and
check the R value to make sure it was optimised for
the MP.
I soldered an XLR to some header pins to
make it easier to test things on a breadboard and was
alarmed at the results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve
terminal on the mic
The -ve cap lead goes to the other
resistor terminal.
I? played with values of R until going
all the way to 1MOhm which gives a reading of 7-8v
which fluctuates a lot.
As a side note with the negative lead of
the cap connected to pin 2 V was ~34v so I sawpped it
to be positive to pin 2
This doesn't seem to be even remotely
close to the previous results in the PDF that Richard
Lee created.?
?Am I missing something?
|
Re: Strange Simple P48 readings
The capsule FET was integral to this. Otherwise you are measuring 48volts supplied by the 6.8K resistor (internal to the preamp) in series with the external P48 resistor. If you go to 1M you will be close to 48 volts ?at 6.8K you will be 24 volts. Make sense? Best Regards,
Jules Ryckebusch?
toggle quoted message
Show quoted text
On Mar 17, 2024, at 12:44, Adrian Hicks <mail@...> wrote:
? I haven't connected the capsule for fear of blowing it. I'm guessing herein lies my problem?
But where is the capsule connected?
Le 17/03/2024 ¨¤ 18:30, Adrian Hicks a
¨¦crit?:
I don't know of an easy way of drawing a schematic
on my phone but I did take a picture of the breadboard when I
was fiddling at home earlier.?
RGB corresponds to 123
The DMM? is hooked up to the black probe on the
leg of R1 and to the red wire on pin 3.
I hope that makes more sense?
Can you draw a schematic? Your description is hard to
figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a ¨¦crit?:
A few years back I bought some EM172s to
use with my Zoom H5.
More recently I've been lucky enough to
pick up a lightly used MixPre6ii. I've been using the
172s with no problems, but thought I would go back and
check the R value to make sure it was optimised for
the MP.
I soldered an XLR to some header pins to
make it easier to test things on a breadboard and was
alarmed at the results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve
terminal on the mic
The -ve cap lead goes to the other
resistor terminal.
I? played with values of R until going
all the way to 1MOhm which gives a reading of 7-8v
which fluctuates a lot.
As a side note with the negative lead of
the cap connected to pin 2 V was ~34v so I sawpped it
to be positive to pin 2
This doesn't seem to be even remotely
close to the previous results in the PDF that Richard
Lee created.?
?Am I missing something?
|
Re: Strange Simple P48 readings
I haven't connected the capsule for fear of blowing it. I'm guessing herein lies my problem?
But where is the capsule connected?
Le 17/03/2024 ¨¤ 18:30, Adrian Hicks a
¨¦crit?:
I don't know of an easy way of drawing a schematic
on my phone but I did take a picture of the breadboard when I
was fiddling at home earlier.?
RGB corresponds to 123
The DMM? is hooked up to the black probe on the
leg of R1 and to the red wire on pin 3.
I hope that makes more sense?
Can you draw a schematic? Your description is hard to
figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a ¨¦crit?:
A few years back I bought some EM172s to
use with my Zoom H5.
More recently I've been lucky enough to
pick up a lightly used MixPre6ii. I've been using the
172s with no problems, but thought I would go back and
check the R value to make sure it was optimised for
the MP.
I soldered an XLR to some header pins to
make it easier to test things on a breadboard and was
alarmed at the results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve
terminal on the mic
The -ve cap lead goes to the other
resistor terminal.
I? played with values of R until going
all the way to 1MOhm which gives a reading of 7-8v
which fluctuates a lot.
As a side note with the negative lead of
the cap connected to pin 2 V was ~34v so I sawpped it
to be positive to pin 2
This doesn't seem to be even remotely
close to the previous results in the PDF that Richard
Lee created.?
?Am I missing something?
|
Re: Strange Simple P48 readings
But where is the capsule connected?
Le 17/03/2024 ¨¤ 18:30, Adrian Hicks a
¨¦crit?:
toggle quoted message
Show quoted text
I don't know of an easy way of drawing a schematic
on my phone but I did take a picture of the breadboard when I
was fiddling at home earlier.?
RGB corresponds to 123
The DMM? is hooked up to the black probe on the
leg of R1 and to the red wire on pin 3.
I hope that makes more sense?
Can you draw a schematic? Your description is hard to
figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a ¨¦crit?:
A few years back I bought some EM172s to
use with my Zoom H5.
More recently I've been lucky enough to
pick up a lightly used MixPre6ii. I've been using the
172s with no problems, but thought I would go back and
check the R value to make sure it was optimised for
the MP.
I soldered an XLR to some header pins to
make it easier to test things on a breadboard and was
alarmed at the results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve
terminal on the mic
The -ve cap lead goes to the other
resistor terminal.
I? played with values of R until going
all the way to 1MOhm which gives a reading of 7-8v
which fluctuates a lot.
As a side note with the negative lead of
the cap connected to pin 2 V was ~34v so I sawpped it
to be positive to pin 2
This doesn't seem to be even remotely
close to the previous results in the PDF that Richard
Lee created.?
?Am I missing something?
|
Re: Strange Simple P48 readings
I don't know of an easy way of drawing a schematic on my phone but I did take a picture of the breadboard when I was fiddling at home earlier.? RGB corresponds to 123 The DMM? is hooked up to the black probe on the leg of R1 and to the red wire on pin 3. I hope that makes more sense?
Can you draw a schematic? Your description is hard to figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a
¨¦crit?:
A few years back I bought some EM172s to use with
my Zoom H5.
More recently I've been lucky enough to pick up
a lightly used MixPre6ii. I've been using the 172s with no
problems, but thought I would go back and check the R value to
make sure it was optimised for the MP.
I soldered an XLR to some header pins to make it
easier to test things on a breadboard and was alarmed at the
results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve terminal on
the mic
The -ve cap lead goes to the other resistor
terminal.
I? played with values of R until going all the
way to 1MOhm which gives a reading of 7-8v which fluctuates a
lot.
As a side note with the negative lead of the cap
connected to pin 2 V was ~34v so I sawpped it to be positive
to pin 2
This doesn't seem to be even remotely close to
the previous results in the PDF that Richard Lee created.?
?Am I missing something?
|
Re: Strange Simple P48 readings
Can you draw a schematic? Your description is hard to figure.
Where are you measuring teh voltage?
Le 17/03/2024 ¨¤ 17:15, Adrian Hicks a
¨¦crit?:
toggle quoted message
Show quoted text
A few years back I bought some EM172s to use with
my Zoom H5.
More recently I've been lucky enough to pick up
a lightly used MixPre6ii. I've been using the 172s with no
problems, but thought I would go back and check the R value to
make sure it was optimised for the MP.
I soldered an XLR to some header pins to make it
easier to test things on a breadboard and was alarmed at the
results.
Wiring is as follows:
Pin1 - resistor
Pin 2 - capacitor +ve
Pin three to what would be the +ve terminal on
the mic
The -ve cap lead goes to the other resistor
terminal.
I? played with values of R until going all the
way to 1MOhm which gives a reading of 7-8v which fluctuates a
lot.
As a side note with the negative lead of the cap
connected to pin 2 V was ~34v so I sawpped it to be positive
to pin 2
This doesn't seem to be even remotely close to
the previous results in the PDF that Richard Lee created.?
?Am I missing something?
|
