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Auto Power Switch
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This circuit turns a "slave" device on when a "master" device is turned off or on depending on the state of S1.  The circuit is designed to be reliable and solid on or off.  Some simpler slave switches can mistrigger or trigger partially, blowing a fuse or damaging the load.  R6 set the sensitivity.
More:  Control Circuits;   Power Control Circuits;   Switch Circuits  
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