The single key 555 dual steady switch circuit

Published:2011/7/3 20:48:00 Author:Borg | Keyword: single key, dual steady switch | From:SeekIC

In figure 1 is the circuit. When the circuit gets power, C1 makes 6-pin of IC(555) acquire a positive pulse, the 3-pin is outputting a low LEV, at the moment, there is no voltage on C2. By pressing the key of S, the 0 LEV is working on 2-pin of the IC, 3-pin is reversed in a high LEV, C2 is charged by R3. After S is released, C2 is charged to Vcc, both the 2-pin and 6-pin are offset to 1/2Vcc by R1 and R2, the high LEV of 3-pin remains the same. By pressing S again, the voltage on C2 makes the voltage on 6-pin of the IC higher than 2/3Vcc, and 3-pin is reversed in a low LEV.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/The_single_key_555_dual_steady_switch_circuit.html

Print this Page | Comments | Reading(3)