This small switched regulator was found in an 60’s Optical Electronics. The circuit uses an integrated from the time, which is difficult to obtain today.
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...