Input Impedance

Thread Starter


Joined Nov 14, 2019
Good evening, or morning, or afternoon.

I'm trying to calculate de input impedance of a simple microphone pre-amplifier circuit, the circuit has a -20dB PAD attenuator and I just want to be sure if I'm calculating things right. The aim is to get as close as possible impedances with and without the PAD.

Hope the drawing is not to bad.

Thank you in advance!

Captura de ecrã 2020-11-05, às 23.18.46.png