Reply to "Schematic for QSI DCRU"

stan2004OGR Forum Member

Putting a picture to G's words, the 2 NAND gate outputs (pins 3 and 4 of the 4093 chip) go to the header. They jumper over one slot to "B1" and "B2" as etched on the board. B1 and B2 go to the Base of the 2N5087 transistors labeled 1 and 2. The transistor outputs drive the relays labeled 1 and 2. Your board has 4-wires in place of the header jumpers - apparently to manually set the relays?

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