I just salvaged this little jewel from an Aiwa AV-X120 Stereo Receiver, that sorta got crushed. The receiver I had found at the Goodwill for 5 bucks. What I wanted were the transformer and monolithic power amplifiers. Along the way, the volume control got tossed in the to-be-saved tub. Now a few months later, I uncovered it again and the light went on. Now I need to do my homework before I can use this in NexGen's RSS-IOP audio controls (it will be buried in one of the boxes). This has 4 audio channels. It has 2 ICs on the PCB MVR501.
Also, they used two (2) transistors (CSD655, 2SA952) per side to drive the motor's H-bridge. This could be replaced by an H-Bridge Sheild.
Potentiometer Pin Outs
Control PCB Schematic
Motor H-Bridge Driver Schematic