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Help with EFM 3544 VCO
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Help with EFM 3544 VCO
tardishead
I built 3 of these 15 years ago. Its a copy of either Moog Prodigy or Taurus can't remember which
The waveforms are great - the sync is great - but the FM is very weak. How can I get more out of the FM?

mtrnn
I'm not 100% sure but the fm input on schematic looks like it is linear fm. What you probably want is exponential fm. That you can get easily either adding one resistor & attenuator alongside the v/Oct input, or just by using external mixer for v/Oct input to mix the modulation and your v/Oct voltages together. The fm input in the schematic is good for vibrato and other subtle modulation.
tardishead
gotcha
thanks for the help
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