MATRIXSYNTH: Yuyo cmos synth - First try Attiny85 dco with analog cmos shaping and twin t filter


Friday, February 13, 2026

Yuyo cmos synth - First try Attiny85 dco with analog cmos shaping and twin t filter


video upload by JIANT

"everything is from the synth to the zoom recorder, twin t drums, xor snare, pt2399, and cmos stuff.

attiny85 reseting the phase of 40106 oscilators, the digital control accepts 1voct from keysetp and go to the 40106 inputs through resistors, a little rc for filtering the pwm, and for this reason when you change the oscillator frequency you can get intervals and crazy stuff. is not orthodox but suits my need for Rich timbres. the dco goes to 40106 buffers , and then 4040 dividers, twin t filters, one for each of the two voices, one goes to env, vca, filter, delay, and the other one to clock divider and filter, to get the sub osc.

firmware super simple only for checking the conversion from filtered frecuency of the attiny85 to my 40106 non exponencial vcos.
currently is tracking 10 octaves really good, the trick is put a voltage divider in the cv in of the attiny because keystep has 0 to 10v and the attiny accepts 0 to 5v tehn the tracking inside the attiny converts o.5v oct to 1 volt oct. i dont know anything about coding but i made it with chat gpt and my design . source code will be in the coments ."

Previous videos:

YUY0 - CMOS based Raw Modular analog sound machine

video upload by JIANT

"🎛️ Here's another jam with my full CMOS DIY modular synth
I'm planning to keep developing it and hopefully put it up for sale soon. I'd love to know if anyone in the group would be interested in having one. The final version will feature pots instead of trimpots, better patch pins, and a custom case I'm currently designing.
EDIT:
Fully based on CMOS ICs (except for the delay) and running at 5V.
Includes:
• 6× VCO/LFO with sync inputs
• Twin-T drums
• Sequencers
• Clock divider
• Mixer/drive
• Gate-to-trigger monostables
• Hi-hat/snare
• Twin-T filter
• Envelope/VCA
• Passive mults and diode mixers
It has a Baby 10 pitch CV sequencer with reset inputs, and another one for triggers with two 10-switch outputs for pattern generation. This one also features gate outputs from 5 to 10 steps for polyrhythmic resets.
Three monostables convert gate to trigger with pulse width pots.
Six oscillators/LFOs with sync inputs, two of them with CV pitch inputs.
Two Twin-T filters that can act as band-pass with full resonance for synth voices or kick/toms when triggered. Both have pitch and decay pots.
Noise/snare/hihat/cowbell module with integrated envelope.
Delay with CV input and the option to clock it into digital noise for amazing textures.
Clock divider with 8 divisions, plus lots of passive mults, attenuators, and diode mixers for weird triggers and modulation.
A 4-channel stereo mixer, each channel with a gain pot that acts as analog distortion when maxed out—allowing selective channel distortion.

The oscillators don’t follow 1V/oct yet, because my goal with this instrument is to discover melodies by ear while patching. I find it refreshing—it breaks me out of muscle memory.

The system is intentionally designed to avoid fully linear behavior. I left several outputs unbuffered to allow cross-modulation between modules when they start drawing more voltage than they “should.” This creates strange patterns and unexpected results that are often way better than the original idea.

All in all, it’s a personal project that turned out great. Several people asked if I could make a more pro version in terms of build and PCB design while keeping the same circuit. So I’m taking the chance to ask here if anyone’s interested. Thanks for the space!

---------------------------------------------------------------------------------

🎛️ Buenas les muestro otra jam con mi sinte full CMOS DIY modular
Tengo ganas de seguir desarrollándolo y ponerlo a la venta pronto, me serviría saber si hay interesados en el grupo en tener uno. La versión final sería con potes en vez de trimpots y mejores pines de patcheo, además de una carcasa custom que estoy diseñando.
EDIT:
Completamente basado en integrados CMOS (excepto el delay) y funcionando a 5V.
Incluye:
• VCO/LFO x6 con entradas de sincronía
• Drums Twin-T
• Secuenciadores
• Divisor de clock
• Mixer/drive
• Monoestables de gate a trigger
• Hi-hat/snare
• Filtro Twin-T
• Envelope/VCA
• Mults pasivos y mixers pasivos con diodos
Tiene un Baby 10 de pitch CV con entradas de reset, otro igual pero de trigger con dos salidas de 10 switches para generar patrones, este último con salidas de gate de 5 a 10 pasos para resetear en polirritmias.
3 monoestables que convierten gate a trigger con potes de ancho de pulso.
6 osciladores/LFO con entradas de sync, dos de esos con entradas de CV pitch.
2 filtros Twin-T que pueden ser band-pass con full resonancia para voces de sinte o kick/toms enviándoles un trigger a la entrada. Los dos con potes de pitch y decay.
Módulo de ruido/snare/hihat/cowbell con envelope integrada.
Delay con CV in y posibilidad de llevar el clock a ruido digital que tira unas texturas increíbles.
Clock divider con 8 divisiones, y muchos mults pasivos, atenuadores y mixers a diodos para triggers y modulaciones raras.
Mixer de 4 canales con salidas estéreo, cada canal tiene un pot de ganancia que al máximo funciona como distorsión analógica, pudiendo distorsionar de a un canal solamente.

Los osciladores por ahora no tienen 1V/oct porque mi intención con el instrumento es ir encontrando las melodías mientras voy patcheando a oído, y a mí me resulta agradable porque me saca de la memoria muscular.

El sistema está diseñado para que no funcione de una manera completamente lineal. Dejé varias salidas sin bufferear a propósito para generar modulación cruzada entre los módulos cuando empiezan a chupar más voltaje del que “deberían”. Esto genera patrones raros y resultados inesperados que generalmente son mil veces mejores que la idea inicial.

En fin, es un proyecto personal que salió muy bien y me pidieron varias personas si podía hacer una versión más pro en construcción y diseño de placa pero manteniendo el mismo circuito. Así que aprovecho y les pregunto por acá si hay interesados. Gracias por el espacio."

YUY0 - CMOS based Raw Modular analog sound machine

video upload by JIANT

"🎛️ Here's another jam with my full CMOS DIY modular synth
I'm planning to keep developing it and hopefully put it up for sale soon. I'd love to know if anyone in the group would be interested in having one. The final version will feature pots instead of trimpots, better patch pins, and a custom case I'm currently designing.
EDIT:
Fully based on CMOS ICs (except for the delay) and running at 5V.
Includes:
• 6× VCO/LFO with sync inputs
• Twin-T drums
• Sequencers
• Clock divider
• Mixer/drive
• Gate-to-trigger monostables
• Hi-hat/snare
• Twin-T filter
• Envelope/VCA
• Passive mults and diode mixers
It has a Baby 10 pitch CV sequencer with reset inputs, and another one for triggers with two 10-switch outputs for pattern generation. This one also features gate outputs from 5 to 10 steps for polyrhythmic resets.
Three monostables convert gate to trigger with pulse width pots.
Six oscillators/LFOs with sync inputs, two of them with CV pitch inputs.
Two Twin-T filters that can act as band-pass with full resonance for synth voices or kick/toms when triggered. Both have pitch and decay pots.
Noise/snare/hihat/cowbell module with integrated envelope.
Delay with CV input and the option to clock it into digital noise for amazing textures.
Clock divider with 8 divisions, plus lots of passive mults, attenuators, and diode mixers for weird triggers and modulation.
A 4-channel stereo mixer, each channel with a gain pot that acts as analog distortion when maxed out—allowing selective channel distortion.

The oscillators don’t follow 1V/oct yet, because my goal with this instrument is to discover melodies by ear while patching. I find it refreshing—it breaks me out of muscle memory.

The system is intentionally designed to avoid fully linear behavior. I left several outputs unbuffered to allow cross-modulation between modules when they start drawing more voltage than they “should.” This creates strange patterns and unexpected results that are often way better than the original idea.

All in all, it’s a personal project that turned out great. Several people asked if I could make a more pro version in terms of build and PCB design while keeping the same circuit. So I’m taking the chance to ask here if anyone’s interested. Thanks for the space!

---------------------------------------------------------------------------------

🎛️ Buenas les muestro otra jam con mi sinte full CMOS DIY modular
Tengo ganas de seguir desarrollándolo y ponerlo a la venta pronto, me serviría saber si hay interesados en el grupo en tener uno. La versión final sería con potes en vez de trimpots y mejores pines de patcheo, además de una carcasa custom que estoy diseñando.
EDIT:
Completamente basado en integrados CMOS (excepto el delay) y funcionando a 5V.
Incluye:
• VCO/LFO x6 con entradas de sincronía
• Drums Twin-T
• Secuenciadores
• Divisor de clock
• Mixer/drive
• Monoestables de gate a trigger
• Hi-hat/snare
• Filtro Twin-T
• Envelope/VCA
• Mults pasivos y mixers pasivos con diodos
Tiene un Baby 10 de pitch CV con entradas de reset, otro igual pero de trigger con dos salidas de 10 switches para generar patrones, este último con salidas de gate de 5 a 10 pasos para resetear en polirritmias.
3 monoestables que convierten gate a trigger con potes de ancho de pulso.
6 osciladores/LFO con entradas de sync, dos de esos con entradas de CV pitch.
2 filtros Twin-T que pueden ser band-pass con full resonancia para voces de sinte o kick/toms enviándoles un trigger a la entrada. Los dos con potes de pitch y decay.
Módulo de ruido/snare/hihat/cowbell con envelope integrada.
Delay con CV in y posibilidad de llevar el clock a ruido digital que tira unas texturas increíbles.
Clock divider con 8 divisiones, y muchos mults pasivos, atenuadores y mixers a diodos para triggers y modulaciones raras.
Mixer de 4 canales con salidas estéreo, cada canal tiene un pot de ganancia que al máximo funciona como distorsión analógica, pudiendo distorsionar de a un canal solamente.

Los osciladores por ahora no tienen 1V/oct porque mi intención con el instrumento es ir encontrando las melodías mientras voy patcheando a oído, y a mí me resulta agradable porque me saca de la memoria muscular.

El sistema está diseñado para que no funcione de una manera completamente lineal. Dejé varias salidas sin bufferear a propósito para generar modulación cruzada entre los módulos cuando empiezan a chupar más voltaje del que “deberían”. Esto genera patrones raros y resultados inesperados que generalmente son mil veces mejores que la idea inicial.

En fin, es un proyecto personal que salió muy bien y me pidieron varias personas si podía hacer una versión más pro en construcción y diseño de placa pero manteniendo el mismo circuito. Así que aprovecho y les pregunto por acá si hay interesados. Gracias por el espacio."

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