The TIL probe circuit

Published:2011/6/15 1:43:00 Author:Christina | Keyword: TIL, probe | From:SeekIC

If the polarity switch is in the position as shown, so when the input probe receives the low-level (negative) pulse, the LED turns on until the circuit is reset. If you push switch to another position, and there is high-level voltage or +5V input pulse, the LED turns on too.



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