I made a first attempt at adding CV in and an external power supply to a Korg Monotron Delay:
For the power I simply used an external power bank and connected 5V and GND to the respective pins on the Monotron.
The 5V CV signal from the Korg SQ-1 goes into the gate pad on the Monotron. It kind of works, but tuning is quite tempera(ture)mental.
Apart from temperature the pitch is directly dependent on the Monotron’s supply voltage, so I would either need to step down the USB voltage to ~3V and make use of the boost converter that is built into the Monotron to get 5V, or use a higher voltage power supply and regulate it down. Any idea what’s better?🤔
This evening I had some fun with @diyelectromusic‘s SimpleMIDIDecoder MicroPython library and the TM1638 LED&KEY module. The display shows MIDI channel and note number and the LEDs light up depending on velocity.
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I spent longer than I care to admit on failing to get either a TM1638 LED, an SH1106 OLED or a 1602 LCD to work with my Pico. Turns out one of my jumper wires had an intermittent fault 🤦
After a wire transplant everyone is finally happy!