CAVE PROJECT! This information is here to support people who have been making MFOS gear since I started posting synth-diy information back in about 2002 or 2003. These projects have ALL been superceded by new and better designs. I do not recommend that you make these since they have been improved over the years. I am not providing any support for these projects beyond publishing this historical information.
This is an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building experience and electronics knowledge and equipment ownership (scope, meters, etc.) is taken for granted. If you are interested in building this project please read the entire page before ordering PC boards to ensure that the information provided is thorough enough for you to complete the project successfully.

Updated and Improved VCO With Separate Op-Amp for Pulse Wave

Same as the other new oscillator except uses a separate OP-Amp for the pulse wave. Remember to mount R3 (TempCo) in contact with the CA3046 case.

Updated and Improved VCO With Separate Op-Amp for Pulse Wave


Updated and Improved VCO
With Separate Op-Amp for Pulse Wave (PCB Component Side View)

Updated and Improved VCO
With Separate Op-Amp for Pulse Wave Parts Placement

Mount PT146 in contact with the CA3046