AS3340 VCO /w hard/soft sync, FM modulation

[analogoutput]

@Trumac22

I also added a 1M resistor across legs 4 and 5 (something about hysteresis, means nothing to me) and it helped, but also reduced the pulse width pot to doing its full sweep in about 10 degrees of rotation. I cba to rectify that and it didn’t seem to make a huge difference, so away with it.

A 10M resistor between pins 4 and 5 reportedly eliminates the glitches at the end of the pulse wave. See discussion:

Glitches or ringing on the pulse output of the AS3340 and CEM3340

Try this: [image]

It’s present as of rev. 2.2 in the Kassutronics design. T. Henry’s VCO Maximus has a 1M resistor between those pins.