This very low current circuit was found in the April 1995 issue of Electronics Now magazine. The circuit operates at voltages from 6.5 to 10 V.
This is a commercial circuit from the year 1958. Transistors are germanium types and transformers...
This circuit was found in American documentation from the 1960s. The operational amplifier is from that...
This circuit can be used in alarms, data links or áudio links using IR radiation. The circuit is...