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.
Found in old documentation, this circuit uses special discharge lamps (neon) of the time. The...
This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according...
This circuit is designed to measure very weak currents, in the order of picoamperes. We found it...