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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.

I'm not sure there would be any significant difference in sound quality between Vgnd and Gnd as a reference for the transformer de-coupling? I think it would simply mea

Has anyone tried the TLE2071? https://www.ti.com/lit/ds/symlink/tle2071.pdf any insights into real world noise performance vs the 1641? I'm not expert enough in opamps to interpret the figures for the

Yes when I first did this opamp tx circuit a couple of years ago, I had the experience that decoupling the transformer solved VG imbalance. I didn't need to refer it to actual ground IIRC. In this

Funny you should ask, I did exactly this (see pic here <https://lacinato.com/pub/electrets/instmic/mandomic.jpg>). I made a Primo EM-184 with Simplest P48 and built a clip-on mount to attach it to a

Hi all - I am interested in close-mic'ing some instruments that would normally be "professionally" mic'd with a DPA-4099. I am curious if anyone has done much of a shoot-out with regards to their

Well, for testing purposes - rather than actual final use? - then I've found the good old fashioned TL071? works quite well. It has many similar parameters, but it does make a lot more noise! As to

The guardring seems like a good idea, but I don't see how it could be done with one of these tiny opamps. it would have to be very fine, and if it were left free of solder mask, it would certainly

A friend of mine recently had exactly the same problem you described here and also solved it by thoroughly cleaning the PCBA with IPA. I gave him the advice to add a guardring. The guardring connects