MATRIXSYNTH: How DIY 960 Sequential Controller work

Saturday, December 26, 2020

How DIY 960 Sequential Controller work

Zygimantas Laurutis

"Module takes bipolar 12 to 15 volt power for operational amplifiers.
Positive rail is regulated down to 5V and power Atmega 328 microcontroller.
74HC595 shift register generates output signals for all steps.
Each step wire powers lamp and rotary switch.
Rotary can send signal to stop or skip busses each have dedicated input on Atmega 328P.
When switch is set to normal, step feeds 3 potentiometers.
Every line of potentiometers collects to a bus, that is amplified with TL074 operational amplifier by the factor of 1, 2 or 4 and goes to CV outputs.
Third line can be mixed with rate control, that uses onboard analog to digital converter.
Every step has dedicated input ports, that can be triggered with button or external signal.

You will find source code and technical drawings at:"

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