NOISE_IMMUNE_SCR_TRIGGER_GENERAIOR

Published:2009/7/21 8:05:00 Author:Jessie | From:SeekIC

Modification of line-type radar modulator gives general-purpose triggering circuit that is immune from noise. Expensive pulse-forming network of conventional scr trigger is replaced by capacitor. Sharply peaked out.put pulses are ideal for triggering radar modulators for firing strobe flash tubes. Scr conducts for 10 microsec after triggering, and C1 is negative for next 15 microsec because of ringing with L1, so false triggering can occur from low-level noise pulses for only last 5 microsec, by which time capacitor has charged enough to forward-bitts scr so large triggering pulse is again required to turn it on. Circuit is ready for next trigger 60 microsec after C1 is discharged. Maximum prr is 12 kc.-J. E. Curry, No Pulse-Forming Not.work in SCR Trigger Generator, Electronics, 39:18, p 97-98.



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