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

By Julian

Youtuber, shed dweller, solar charge controller aficionado

17 thoughts on “It works! – microphone preamplifier – vocoder”
  1. Avataaar/Circle Created with python_avatars Chris Umbel says:

    "It's a power supply and it's on my bench. That makes it a bench power supply." — I honestly LOLed.

  2. Avataaar/Circle Created with python_avatars Roy Tellason says:

    Wow. Just wow…

  3. Avataaar/Circle Created with python_avatars Kenn Mossman says:

    Use a PROPER PSU

  4. Avataaar/Circle Created with python_avatars Kenn Mossman says:

    you need a Looooooooooooooooong holiday

  5. Avataaar/Circle Created with python_avatars Kenn Mossman says:

    dual 741 ???????????????????????????

  6. Avataaar/Circle Created with python_avatars Kenn Mossman says:

    that makes it a bench power supply…………..so much for British humour. Can I watch Dave Allan now?

  7. Avataaar/Circle Created with python_avatars Kenn Mossman says:

    plus and minus 12V, so 24VDC ???

  8. Avataaar/Circle Created with python_avatars D Rex says:

    Question: Is it best (More efficient) to Buck to 3.3volts from say 4 AA's NiMH , or Boost to 3.3v from 2 AA's NiMH twice, what gives you more run time. (being as you have one of those silly scope thingies).

  9. Avataaar/Circle Created with python_avatars Stephen Scutt says:

    Nice work in fixing your design Julian. Crossed over legs? Im sure its all in the best possible taste! 😉

  10. Avataaar/Circle Created with python_avatars Okurka says:

    "Prototype PCBs for $2 (Any Color)"
    They don't come in bright pink.

  11. Avataaar/Circle Created with python_avatars LiveArtPresents says:

    waste of time and space.

  12. Avataaar/Circle Created with python_avatars Dana says:

    Mr Ilett . please check Facebook.thx.

  13. Avataaar/Circle Created with python_avatars Tested to Destruction says:

    just make a couple of 8 pin dip daughter boards flip ze pinz

  14. Avataaar/Circle Created with python_avatars AW Services says:

    Love your projects but PLEASE invest in your audio delivery

  15. Avataaar/Circle Created with python_avatars tablatronix says:

    my ears! lol

  16. Avataaar/Circle Created with python_avatars James Stockton says:

    One thing I noticed which may help reduce the hum is a ground flood. If you flood the top and bottom and stitch them together with vias this will vastly improve the sound quality.

  17. Avataaar/Circle Created with python_avatars Patrick Sweetman says:

    Seriously comical, Julian.

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