Found in a 1965’s Electronic Design, this circuit operates with a voltage of 1.5 V. The relay can be of a reed relay or other type.
Found in a 90s 73 magazine, this circuit uses an unusual component today which is the XR2206. |...
Picoammeter (CB9661E) This circuit is designed to measure very weak currents, in the order of...
This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a...