DIY Analog Synthesizer Demonstration

YouTube via GVNZ9
"This is my DIY Synth. Using schematics from Ray Wilson, Thomas Henry and Marc Bareille, i've bulilt my owm machine featuring:

2 XR VCO
1 24dB Lowpass Filter
1 12dB State variable Filter
2 ADSR
2 VCA
1 LFO whit S&H
1 white noise generator
1 MIDI-CV (mcv876-4CV)
there is also a modular section in the lower-right corner of the upper half, allowing to reach almost every output&input of the single circuits. Patching an input overrides the internal connections to that input.

The XR vcos are great! Those allows continuous variation (called SKEW) from triangle to saw and from sine to "rampoid" (sort of saw with sine-ish decay) waves. I added sync switches, fm switches, lfo to skew, lfo to pitch switches, vco to skew switches.

The 12dB filter has a special feature: beyond the LP, BP, HP output it has an output wich continuosly blends the LP and HP outs according to the LFO signal

the LFO outputs saw, ramp, triangle waves and a S&H stage output. The S&H is clocked by the LFO and feeded with white noise.

Apart from circuit schematics, I made everything: PCBS, enclosure, panels, knobs, labels. The enclosure is made of walnut and can be closed and carried as a suitcase.

once closed it measures (HxWxD) 23x33x14 Cm and weights around 6Kg

took many hours of work and cost me something around 250€"

My diy synth into diy filterbank

"This is my diy synth (see my other video for more info about it) going into my diy filterbank, wich adds some further filtering and distortion to the sound.
A midi sequence is sent from my pc to the synth, the sound generated by the latter is fed into a filter, wich is controlled by a cv and by the output of another filter, again fed with the signal coming from the synth. The step sequencer is controlled by the note gate signal coming from the synth's midi-cv, and it's output voltage controls the second filter of the filterbank. What you hear is the lp+bp (plus a bit of the original signal) output of the first filter run thru the filterbank compressor."

filterbank groove mangling

"This is a simple drum loop (never changes during the video) passed thru my filterbank. The gate generator outputs a pulse every hihat hit (1/8th) which commands the beatslicer and the step sequencer. The first has 3 outs and slices the input according to the rhythmic pattern "1&2&" : "1" goes to first output, "2" to the second, "&s" to the third; every output is processed in a different way. The step sequencer controls the first filter. Also other things are used in this patch: distortion, compressor, square wave vco."