The circuit shown has a voltage gain of 500 times and can use equivalent FETs like the BF245. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
This power supply provides a 1.5 V voltage from the 6.3 V 6 V secondary of a common transformer. The...
When the power is on, the 1 µF capacitor charges slowly by R1 and P1 until then on trigger...
The power transistors from this 1999 source must be mounted on excellent heat sinks. The circuit is...