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.

Touch Bistable 4011 (CB16943E)
This circuit can be used as an input shield by removing the signal directly from the second port,...
Ion detector (CB21003E)
This sensitive circuit was found in an Electronics Hobbyists Handbook from the 1990s. The circuit can...
6m preamplifier (CB20253E)
We found this circuit in an 80's documentation. The circuit has a gain of 30 dB and uses a varicap...