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I have built a few sets of simpleP48 mics using Primo EM172 (matched pairs) or PUI AOM5024 electret capsules. My capacitors were little electrolytics, often salvaged from discarded electronics; my

I use these: *Resistor:* PR9372-GP1/2 https://www.prpinc.com/pr9372-series *Capacitor:* Nichicon FW-series

What Do You Think of These Components for an EM272 P48 Build? I’m putting together a P48 phantom power circuit for the EM272 mic and want top-notch audio quality. Here’s what I’m thinking: ?

The other things that may be going on are secondary virtual ground conductance passes that affect the two 47K resistors, the transformer, i don't know exactly. The virtual ground works well with AC

" I have successfully used the VSSOP version. I have the PCBs assembled (PCBWay) and have not had issues. I am also using SMD 1G and 500M resistors. I feel like there is something else going on here."

"I'm guessing your friend was probably successful with his OPA1642 guard ring using an SOIC package?" Indeed, that was an SOIC. But the same guard ring design can also be applied when using a VSSOP

An update on this circuit. I finally had a clear day to prototype the left half of the circuit. I realised that an AD8220 was just an AD8226 with an extra FET stage in the input. Seeing as I've

I have successfully used the VSSOP version. I have the PCBs assembled (PCBWay) and have not had issues. I am also using SMD 1G and 500M resistors. I feel like there is something else going on here.

I'm guessing your friend was probably successful with his OPA1642 guard ring using an SOIC package?... I would imagine the VSSOP version is likely to be a step too far for a guard ring! :) I found a

For hobbyist, guard rings might be difficult to apply correctly and implement on a PC board. But there are plenty of good examples on the internet of how to implement guardrings in combination with

I agree that SOIC? - and especially? VSSOP - make guard rings very difficult - if not impossible! I've used 'air mounting' and scrupulous cleaning of the mounting adaptors - together with isolating

"With regard to the gap between the op-amp pins, I think we have to assume that the gap is sufficient to allow the specified JFET impedance to be utilised? Otherwise there's no point in Texas

Glad to read that decoupIing the TX has solved your offset problem. I think the removal of all the flux and dirt around the Hi-Z parts of an impedance converter is pretty important - this helps to

I added a cap between the ground side of the transformer and actual ground. That sorted out the imbalance, the voltages now read perfectly. Next step is to try it with a capsule or maybe check the

Yes I have SOIC to DIP adapters, I used them a few years back in my very first opamp mic board. https://halfshavedyaks.xyz/pcb/dualopamp.php However they are still a SOIC opamp soldered to a PCB so

I tend to use stripboard for my mic experiments, so the SOIC to DIP? adaptors that kennjava mentions are really very useful. See the image in the middle of page one of *THESE PROJECT NOTES* (

The latter term is more correct, but they actually are the same. The give-away is the identical units. I thought I read 17. My mistake. Well, 7dB can be a lot in a direct comparison. That's right.

Google "soic to dip" and you'll see several sources for little adaptor boards that make it possible to use those ICs in DIP sockets or protoboards. This would be handy at the experimental/development

I'm trying to understand this. the datasheets don't use exactly the same terms. is "equivalent input noise voltage" the same things as "voltage noise density"? TLE2071 gives "Equivalent input noise

The noise voltage density of the TLE071 is 11dB higher tha the 1641. Depending on expectations, that may be a problem.