Joeeeee
New member
Hi,
I bought two accutronics spring tanks and their driver PCBs about a month ago from a seller claiming them to be from a Yamaha organ. I'm hoping I can turn them into a stereo spring reverb unit. Unfortunately, there isn't a schematic online to figure out what goes to what.
The driver circuit seems to be based on a transistor/capacitor design with one side of the circuit board's 5 terminals going to the positive/negative spring tank input, positive/negative spring tank output and a chassis ground.
The other side has 7 terminals and it's not clear what goes to what. The power supply needed is also unknown.
I would greatly appreciate if anybody could help me decipher and understand the PCB (A schematic would be super!). I've had some luck in figuring out where the ground would go and I tested terminals which could be the input and output but that's about how far I've gotten.
Thanks.
Photos here:
I bought two accutronics spring tanks and their driver PCBs about a month ago from a seller claiming them to be from a Yamaha organ. I'm hoping I can turn them into a stereo spring reverb unit. Unfortunately, there isn't a schematic online to figure out what goes to what.
The driver circuit seems to be based on a transistor/capacitor design with one side of the circuit board's 5 terminals going to the positive/negative spring tank input, positive/negative spring tank output and a chassis ground.
The other side has 7 terminals and it's not clear what goes to what. The power supply needed is also unknown.
I would greatly appreciate if anybody could help me decipher and understand the PCB (A schematic would be super!). I've had some luck in figuring out where the ground would go and I tested terminals which could be the input and output but that's about how far I've gotten.
Thanks.
Photos here:
