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.

Power monitor (CB8706E)
This circuit was found in a 90s Hands On Electronics. It monitors the presence of voltage in a...
Logic probe with memory (CB10025E)
This circuit for TTL probes uses a 7400 as the main element. The circuit memorizes the signal...
Headlight Wiper Interval 1 (CB6049E)
This circuit was obtained from a 1985 Electronic Desing. The circuit uses a Darlington which may be...