Holiday Filter

 This maybe should be called the Holiday Filter and the Forever Frequency Shifter . Sometimes DIY projects get prolonged and stretched so much .

 First i built the Yamaha GX VCF clone from MOTM some 10 years ago or more with a pcb i designed and using just BCMXXX matched transistors instead of the CA3046 , and it worked ..but there was this noise that i could not get rid off . I liked the filter very much and the gritty resonance but i could not fix it. Years later i discovered the Old Crow's BPF version ,and i made a layout for that one and built it and it sounded wonderful ,so much ..that i wanted to make the MOTM version again . 

So i made a new layout and fixed the new layout a few times and after a long wait for it's turn i ordered the PCB's from China right before their New Years Eve ,so i waited 10 days for them to send the package .... and here it's been two months now and the PCB's arrived exactly on night before Easter ,so it's right to call this filter a Holiday Filter . 

I am not sure where these VCF's will go as i did not intend to build another synth , i am more interested in recording more feedback music or drum machine loops so i made a panel that serves just as a processor ,it should contain a VC Delay with 2 x Bazier Curve Generators , Envelope Follower and VCA , a Frequency Shifter and 2 x Yamaha GX VCF's . 

Now the F.S. is something that has been dragging around the workshop for years , i got the PCB's for Dome Filter and Ring Mods but still missing the VCO PCB , so i redraw the YuSynth/Ian Fritz Quadrature LFO/VCO and i intend to order the PCB's soon . This is not one of those projects i get obsessed with and it's a shame cause i know there is lot of new sounds to discover with adding these just few modules to my set up. 

The Yamaha GX is a vintage organ/synth ,massive and very expensive instrument that was used (very little) by Led Zeppelin. The Envelope follower that is featured on this panel is the music easel follower ,while the VCA is from Electronotes ,those two modules i have already built along with the VC Delay from Scott Bernardi . 

Maybe it's one of those things i never complete sadly ,新年快乐 & Христос Воскресе!