Pseudorandom LFO

This is a neat module for random (or at least pseudorandom) control voltages. The uppermost jack is CV output, the lower jack is Clock output. The uppermost potentiometer controls the rate (frequency) of the LFO. The switch selects in the middle position the fastest rate, in the upper position medium rate, and in the lower position slow rate. The LED flashes at the Clock pulses. The middle potentiometer changes the range. At 0 the range of the CV is 1 volt, at 100 the range is 10 volts. 10 volts are rather high why an attenuator at the CV input of the controlled module would be neat. The third potentiometer sets the slew of the output CV, at 0 the CV is squared, at 100 the CV is a sinusoid.

The module uses +5V, +12V, GND, -12V, and needs the +5V option installed.

Unfortunately there are no building instructions for this module, but at least you'll find the schematic, some photos, and some comments.

  1. The finished module, without a faceplate.

  2. The finished module.

  3. Testing the LFO.

    This is not very beautiful but never the less a good example of what the module is capable of. There are no changes done at the VCO, all you hear is the pseudorandom LFO sending control voltages to the VCO, with no attenuation of these at the VCO.

  4. Testing the LFO.

    This is a slightly more subtile test. The LFO controls the VCF, and is patched in after 10 seconds. No changes is done on the VCF, no attenuation at the CV input of the filter.

That's it! Have fun and create strange control voltages!


Updated - 2013-10-13 11:22
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