parallel (lpt) port switching interface - sh · +12v 0v +5v +12v 0v 0v +5v 220 220 1n4148 2n2222 0v...
Post on 25-Oct-2020
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+5V0V0V+12V+12V 0V +5V
220
220
2N2222
1N
4148
0V
+5V
PCB 1:1 Component layout
Parallel (LPT) port switching interface
U1
U1 - 12V twin relayopto - optocoupler
opto
to parallel port
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