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AM3340 - VCO (CEM3340)
Overview The CEM3340 was introduced in 1980 and it quickly established itself as the VCO in the Prophet 5 Rev 3, Oberheim OB8, Roland Jupiter 6, Memory Moog and Pro One. This VCO
was revolutionary, as it contained internal temperature compensation and therefore provided a more stable and consistent VCO for polyphonic synths. It dominated the analog synth market until the arrival of DCO's in the mid 1980's.
AM Circuit The AM3340 module is based around the Digisound modular design, but all the CEM3340 designs are very similar. Four VCO waveforms are provide; Square, Trainagle, Saw and Sine. Options are povided for both hard and soft
sync, and the VCO can be controlled via both exponential and linear FM.
The AM design has an extra feature. The waveforms can be selected and mixed together, just like on a Prophet 5. The same buttons have been used with in built
LED's. This makes waveform mixing easy, and adds visual interest. When switched to low frequency range the LFO switch LED flashes according to the speed of the VCO.
The momentary buttons use the AM PBSB sub-module. more »
Panel The front panel is an AM High Density design, 90mm wide, 3mm thick aluminium, 4U high, with black lettering. Controls pots are 3.85mm shaft diameter, knobs are 19mm and 13mm diameter - black and chrome. Switches are all momentary contact push buttons with 3mm LED's.
Build History The schematic has been transferred into Eagle CAD, and the board layout needs to be completed.
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Resources
* CEM3340 Datasheet 
