Thermostatic relay (CB21285E)

We found this circuit in an old QST magazine. The circuit is powered according to the thermostatic relay used.

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...