High speed TTL probe circuit

Published:2011/4/17 8:00:00 Author:Nicole | Keyword: TTL probe | From:SeekIC

RS trigger is connected by NAND gate , it can test very narrow pulse, the narrowest pulse width is equal to the total delay time(about 30ns) of trigger's two NAND gate . When it appears pulse, the circuit will change the state, and it displays the output state of tigger by LED. After finding out the pulse, it must use K2 to reset the circuit. According to the choice of K1, this circuit will be in response to the positive pulse or negative pulse.



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