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

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Page 1: Parallel (LPT) port switching interface - SH · +12V 0V +5V +12V 0V 0V +5V 220 220 1N4148 2N2222 0V +5V PCB 1:1 Component layout Parallel (LPT) port switching interface U1 U1 - 12V

+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