Creation CK12 capsule and power supply question

[Putchy]

But even before that, you'll want some sort of Faraday cage around the capsule and impedance adapter circuitry. Unless you'll be happy end up with mostly mains & harmonics thereof, instead of useful audio signal.

Yes, I've already built one.

Only if you intend to connect to a high-impedance input. But even so, expect lots of mains hum/buzz and other interference. And before you ask, no, you do NOT want to use the built-in audio in a laptop or a desktop.

What do you advise me to put between the output of the circuit and a recording device in this case?

 

[Khron]

What do you advise me to put between the output of the circuit and a recording device in this case?

If you also wanna record, in addition to viewing waveforms (plenty of ways to do that on a computer), you'll probably want to score a used, if possible reputable brand, 2-channel USB audio interface.

 

[ccaudle]

I like because it uses an opa stage

Look for the opa Alice project.
With a good jfet input op- amp you do not need a separate jfet device.
This example has been discussed on these forums, created by member rogs.
https://www.opic.jp137.com/

 

[OneRoomStudio]

It might be worth making a distinction that is not always obvious to everyone. The signal from a condenser capsule is both incredibly high impedance and low level.

Generally speaking, the “headamp,” or circuit built into the microphone converts the high impedance to low impedance, but doesn’t net much gain. Often, this is done by amplifying the signal with an active device, and then”throwing away” that gain with a step-down transformer to decrease the impedance. It can also be done with an active impedance-converting circuit. In either case though, the resulting signal, while lower impedance, is still “mic level,” as opposed to the “line level” that a recording device would expect to see.

That’s the point of a microphone preamp - to convert the low mic level to line level (while maintaining low impedance).

In order to record sound using a condenser capsule, you need both.