This schematic uses the F78570 micro-controller that’s used in other X-10 designs.  But unlike some of the other designs you may have seen, this schematic does not use negative voltages.  The 6375 schematic breaks from the tradition of showing a negative voltage when drawing a 78570.

While other 78570 schematics are electrically correct, they show a negative voltage being used to power a digital micro-controller.  I respectfully submit that the negative voltage is actually logic ground, while the ground shown in these other schematics is actually +15VDC.  I hope this way of representing power and ground helps the design to make more sense to the reader.

In fact, unlike other designs like the RR501 which connects AC HOT to the design’s logic ground, the 6375 connects AC HOT to it’s +15v supply, and creates a local logic ground down from the +15v.

Mitch Orysh

click to view schematic: 6375_Schematic_vC.pdf