Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

High Power Oscillator (CB13090E)
A single high-power transistor MJ15003 is used in the circuit in the figure to generate strong...
12 V to 9 V Converter (CB15056E)
The output current of this circuit reaches 12 mA. The zener diode determines the output voltage. The...
Simple Alarm with NC Sensors (CB12345E)
This circuit can be supplied with voltages of 6 or 12 V, depending on the relay. The transistor can be...