Electret and Amplifier Test Design

A project log for DogEars

This is a project to create superhuman hearing for everyone, finally we too can get annoyed by parking sensors and listen to bats!

frazzledbadgerFrazzledBadger 06/28/2014 at 21:570 Comments

The first step of this project is to build a Electret Element test board.  I've chosen the Panasonic WM-61A element for this.  A basic circuit to power it is thus:

Here, the resistor is to restrict current flow and seperate the Vcc line from the audio signal, and the capacitor is used to AC couple the signal.

This audio is the fed into an opamp, I'll use NE5534 for this. Its only for test purposes, so doesnt have to be too fancy, just a general low noise one will be fine. The final schematic of the element and preamplifier look like this: