The first one is called A*B+C.
The kit is good quality and rather simple.
The A*B+C is a dual, four-quadrant multiplier with VC Offset.
It can perform different operations on its inputs :
- amplifier and inverter of A input.
- VCA on A, with envelope CV on B.
- VC offset generation with C input.
- attenuation/inversion of C input
- ring modulation of audio signals in A and B.
Moreover, the output of the the first channel is normaled to the mixer of the second channel. So the module can serve as CV/audio mixer.
Assembly instructions are good but could have been clearer, especially for the final assembly.
A couple of photos wouldn't have been too much. But I didn't encounter any major issue.
My only gripe was about some parts that had a larger size than their footprint on the PCB. I had to replace the two Schottky diodes with those I had in stock and solder 2 couples of resistors vertically. One resistor even had to be soldered on the other side of the board.
Once again, nothing major in my view.
|Profile view. You can see the vertically mounted resistors|
Finally, the module suffers from a high level of background noise as indicated in this Muff Wiggler forum thread. Anyway, it does not seem prohibitive. There is a suggested mod but it looks like it modifies the potentiometers behaviour, so I didn't want to perform it (and I didn't have the necessary 1/8 W resistors). Time will tell.