Posted by dapj20 on Jun 15, 2018 in Discrete-Circuits, SCR-Trigger-Circuits
A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage… more »