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.

1-Transistor MW Radio (CB18839E)
This simple transistorized radio for listening on a crystal phone was found in a Japanese...
Mini VHV Generator (CB17097E)
This very high voltage generator (VHV) uses a 555 and a power transistor with a heat sink. The...
Protection circuit with manual reset (CB8366E)
Found in a 1969 documentation, this circuit is reset by a push button. The activation time is 100...