LFO reset point on Korg Monotron

I’m doing a lot of guessing here – I’m thinking that the C9/R24 arrangement converts the gate into a trigger pulse. When I try the bottom end of C9 on the circuit board, I just get hiss, no oscillator.

I thinking I might need to look at recreating the C9/R24 arrangement off the Monotron circuit board, or alternatively use something like Ken Stone’s gate-to-trigger converter to reset the LFO on each keypress. Haven’t killed the thing yet, which is a bonus.

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  1. 3rd March 2012shiftr says:

    the same mod works much better if you put the gate signal on the bottom of R32

  2. 4th March 2012ua726 says:

    By better, presumably this means that by coming in there you don’t have to replicate the C9/R24 arrangement?

  3. 6th March 2012shiftr says:

    I removed R11 to set the monotron in ‘drone’ mode. Then i insert the gate signal to the bottom of R32. The gate on signal sets the LFO on during the gate and then lets the lfo run on gate off. It works like a sustain-release envelope.

  4. 7th March 2012ua726 says:

    nice tip, will have to try that.

  5. 16th April 2012pcb prototype says:

    This is truly one of the best blogs I have ever come across. Very well written, precise and to the point. Thanks.

  6. 27th March 2021David says:

    Sounds fantastic! Gonna try this…

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