| Author | Message | | | eric | | Posted: Wed Aug 30, 2006 8:10 am Post subject: Bistable Relay | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | LED provides indication of the current state.
The operation of this straightforward circuit is as follows. The
relay winding that is connected to the flip-flop output whose
state happens to be a logical one, is in the rest state. The LED
in that branch will be off and the output of the corresponding
inverter is low. When S1 is switched to the other position, the
flip-flop output under consideration will change from a ‘1’ to a
‘0’, the corresponding LED will light and there appears a rising
edge on the output of IC1a or IC1b. This rising edge will
appear on the input of IC2a or IC2b via capacitor C1 (C2). This
IC contains not much more than a number of darlington transistors,
so the corresponding transistor receives a positive
pulse at its base. It will start to conduct
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