While studying the schematics of a seventies synthesizer I came across a HTVP873D photocoupler. Does anyone know who made it and/or where I can get a datasheet for it? Or maybe an equivalent, contemporary if possible?
In the schematic it is drawn as a LED shining on a resistor with a centertap. It also mentions a rank of the photocoupler as a number from300 to 1100.
Thanks a lot, Jenalee