This circuit was found in the June 1995 Electroics Now magazine. The relay should be a sensitive type with up to 100 mA trigger current.
This circuit monitors the current in the negative line. The circuit is from a 2005 Linear...
This 80's circuit uses a germanium transistor like the AC121. The circuit has an output...
This ultra-low power metronome was found in a 1991 documentation. The output transistor is general...