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.

Drain dip oscillator (CB22029E)
This drain dip oscillator was found in an old English documentation. The JFET can be of any type...
Inverted Astable 555 (CB13820E)
This circuit was found in a 1977 timer cookbook. The circuit can generate signals with up to 99%...
Light Activated Switch (CB13963E)
This didactic circuit was found in an English publication of 1965. The sensor is an LDR and...