Wednesday, November 19, 2008

All Lined Up...

We really need to do something about those front Panels!

Tuesday, November 18, 2008

Polivoks Filter

This is my rather crusty layout of the Polyvoks Filter... Guess who got the press'n'peel back to front?
Posted by Picasa

Monday, November 17, 2008

OC71 & LM394

Well the OC71 is at least 40 years old (I remember my parents buying the Radio that I pulled it out of) and the LM394 is from week 42 of 1988...
Posted by Picasa

Sunday, November 16, 2008


This is the Yusynth Noise PCB with an old germanium transistor that I plan to try as the noise source...
Posted by Picasa

Thursday, November 6, 2008

More VCF

Another shot of the old VCF...

Wednesday, November 5, 2008

Ancient VCF

While I was rummaging around in some boxes of junk recently i found an uncessesful version of a diode based VCF that i built on veroboard sometime in the early 80's. The date on the opamp is 1979 but it wouldn't have been that long after that! It never worked and there were a lot of mistakes in the translation to veroboard. It was based on a design in the magazine Practical Electronics. In turn that was based fairly heavily on the EMS version of the VCF that was in the VCS family of synthesizers. Forbin will have a version of this filter from Yusynth - the PCB is pretty much populated and now i just need to try and design a front panel for it!