söndag 9 juni 2013

4750 Control oscillator/Noise

A quick exploration of the LFO/noise module shows some issues:
  • The LFO output is clipping, making the bottom part of the sine waveform flat
  • The LFO amplitude varies considerably over the frequency range
In addition to the issues R20, the resistor in series with the +18V supply voltage, has been changed from 100Ohm to 4.7kOhm. This dampens the LFO output voltage to approximately 5V p-p. I'm guessing there is some other issue causing this that this change kind of fixes... I will have to get back to this later.

The frequency ranges indicated on the panel are quite accurate.


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