It Works! - Microphone Preamplifier - Vocoder

Prototype PCBs for $2 (Any Color): https://jlcpcb.com It works - well, eventually. I had a senior moment while laying out the PCB, but a little bit of IC leg bending fixes the problem. ETI Vocoder constructional project reproduced with kind permission of Wimborne Publishing Ltd. http://www.epemag.com Negative Voltage Dual DC12V -12V Power Supply Module: https://ebay.us/dcn23n