Parallel (LPT) port switching interface - SH · +12V 0V +5V +12V 0V 0V +5V 220 220 1N4148 2N2222 0V...
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+5V 0V 0V +12V +12V 0V +5V 220 220 2N2222 1N4148 0V +5V PCB 1:1 Component layout Parallel (LPT) port switching interface U1 U1 - 12V twin relay opto - optocoupler opto to parallel port
Transcript of Parallel (LPT) port switching interface - SH · +12V 0V +5V +12V 0V 0V +5V 220 220 1N4148 2N2222 0V...
+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