_STARTER_CUTOFF

Published:2009/7/13 21:26:00 Author:May | From:SeekIC

In this auto-starter cutoff circuit,two conditions are required to start the car∶The keys switcht must be turned to the starting position, and Q1 must be turned on When Q1 is switched to the ON state,current flOWS through the gate,allowing current to pass through the SCR,provided that the key switchis also turned to the starting position Transistor Q1 can be turned on by connecting R2 through a separate switch to a 12-V power Source or by usmg an existing switched Source Examples of existing Sources might be a brake light,turn signal, parking light,or anything that most people would not normally activate while starting a vehicle With regard to usmg a turn－signal indicator,it doesn’t matter that the power applied to Q1 is not constant Only a pulse IS required to latch the SCR on,provided that the key switch is in the starting position The SCR is a 25-A,50-V unit.



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