Computer photoelectric isolation interface circuit

Published:2011/4/6 1:23:00 Author:Nicole | Keyword: computer, photoelectric isolation, interface | From:SeekIC

This circuit uses optocoupler to isolate the computer and peripheral device. IC2 is CCD; IC1 is threshold comparator, threshold voltage is adjusted by P1; R2, C2 form low-pass filter, to prevent IC1 from false triggering. When TTL output is in the 0 state, to light up the primary of IC2, then its secondary turn-on, made IC1 output is in the 1 state, conversely, output is in the 0 state.



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