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An ambitious attempt to hear the effect of phase cancellation by adjacent multiple feedback bandpass filters summed together in a mixer circuit. Exploding capacitors didn't help.
ETI Vocoder constructional project reproduced with kind permission of Wimborne Publishing Ltd. http://www.epemag.com
Update: I fitted all 16 tantalum capacitors (on the proto boards) the wrong way round :/

By Julian

Youtuber, shed dweller, solar charge controller aficionado

12 thoughts on “Listen to the deep holes”
  1. Avataaar/Circle Created with python_avatars GordieGii says:

    I kept on waiting for the tone sweep generator…

  2. Avataaar/Circle Created with python_avatars EPICK!!! 0202 says:

    🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕😤🤬🤬

  3. Avataaar/Circle Created with python_avatars apb1111 says:

    Great project to share your knowledge and experiment but i cant help thinking it's alot of work to end up with a microphone effect. I might have missed the bigger picture though.

  4. Avataaar/Circle Created with python_avatars Rob Son says:

    Great! I love that real electronic vocoder, i love to hear it in your video's about that built, the working of the filters and such things you only get really clear when you hear them! Great that you built this real vocoder ánd let us enjoy it with you!

  5. Avataaar/Circle Created with python_avatars Wayne Thompson says:

    Are you aware of the dangers of Tantalum capacitors? Exposure by skin contact, ingestion, and inhalation may cause respiratory problems and skin and eye irritation.

  6. Avataaar/Circle Created with python_avatars Sod Almighty says:

    This was utterly pointless.

  7. Avataaar/Circle Created with python_avatars pushpendra khaira says:

    Why no JLPCB for the filters for this project ? any reason ?

  8. Avataaar/Circle Created with python_avatars Kevin Mattern says:

    Something seems to disappear…audience? 🤣

  9. Avataaar/Circle Created with python_avatars AndyCallaway says:

    Julian Illett – the inventor of the light emitting capacitor. 😉

  10. Avataaar/Circle Created with python_avatars bokkenka says:

    If you can see darkness, then yes, you can hear deep holes.

  11. Avataaar/Circle Created with python_avatars Haze Anderson says:

    You turned that cap into an LED. 😂 Phase cancellation seems like a cool idea for low shelf and high shelf filtering but we'd be using it if really were perhaps. Still seems like a nifty idea to study.

  12. Avataaar/Circle Created with python_avatars EyesOnReality says:

    An ‘Audio Spectrum Analyzer’ could be handy on such audio filters. Also you could install a Function Generator on your phone (android has such apps) for White, Pink Or Brown noise along with sine, square, triangle waveforms that's super handy in such circuits.

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