I had to face two problems during the development of the modules:
- How to power and test them during development? A bench-top supply and signal generators? Too big and overkill. My rack loaded with precious stuff? No way I would let a scope probe shorting two pins impact them!
- What kind of setup to use for factory testing? A Doepfer mini case loaded with LFO/signal generators? Too expensive, and hard to operate.
I decided to find a DIY solution, and designed the following box.
It serves the following purposes:
- +/-12V and +5V power supply with euro connector.
- 4 signal generation channels dedicated to clocks (tempo, resolution, pulse width); gates (period, pulse duration); CV (several waveforms, sequences stepping through 1V/Oct octaves or scales); and audio (fixed note/frequency tone generator with various waveshapes).
- 2 signal acquisition channels, one is audio with frequency and note interval measurement (for V/Oct calibration) and the other is digital for clock testing/calibration (frequency/tempo measurement; and pulse width).
Maybe this might be useful to those of you building DIY modules and wanting a quick test/debugging setup less cumbersome than signal generators or your modular setup?
It won’t go farther than Board+programmed MCU+Mouser BOM with very minimal assistance provided (no building instructions etc). This might be useful to hardcore DIYers only anyway!