Pcb sets for two types of multiples both in 5cm kosmo, a doepfer style switched-mult and a buffered/passive mult combo.
There isn’t a whole lot to say about them, the buffered mult is one of the better ones I’ve seen in opinion, with trim pots on each output so you can match them exactly. Here is the original schematic:
I changed his fancy pants resistors and the trim pots and still have the outputs tuned to within .01v of each other. I doubled the design for two independent 1 to 3 mults
On the pcb, you can add one wire from input 1 tip to the switch-tip connection on input 2 if you want to have it ‘normaled’ (is that the right term??)
The switch mult is based off doepfers design but with two pole switches and LED indicators. Here is doepfers model: (http://www.doepfer.de/a182.htm)
I have a 3 or 4 of each left or help yourself to the files and print your own. I have extra faceplates now so if you have one of the circuit pcbs already I’d be happy to send you a free faceplate If you cover shipping