Pressing S1 by a moment L1 glows up, remaining by a time interval depending on C1. This time interval can be adjusted for some seconds to some minutes. The circuit only operates with incandescent lamps. Remember that the circuit is a half wave control. The SCR must be mounted on a heatsink. A TIC108B is recommended for the 110/117 V AC power line and for the 220/240 V AC line the TIC106D must be used. R2 is necessary if the SCR remains on all the time.
Timed Switch
