Isolation for sig gen.

[chipss]

I am wanting to input a signal into a condenser microphone, it has 60 volts dc to polorize the capsule, I would like to not cream my new SDG2000X, I have read using a dc blocking cap, or 1/1 transformer, what would be the best way to do this? Thanks for your time.

[danadak]

Thread here -

https://www.eevblog.com/forum/beginners/floating-a-function-generator/

C coupling both connector shell ground and signal would be OK. If you
are real nervous about this take a couple of back to back zeners to protect
output and add some series R between gen/zeners and mic.

Transformer certainly also doable, maybe much higher ratio to keep from
unduly loading condensor. Depends on what you are trying to do, measure
the F response I would posit ?

You could also consider using a pad - https://en.wikipedia.org/wiki/Attenuator_(electronics)





Regards, Dana.

[David Hess]

If ground is shared which is usually the case, then a coupling capacitor together with a resistive attenuator are commonly used to do this.