This circuit found in an American documentation from 1964, alters the duration of a pulse and can operate at frequencies up to 10 MHz. The transistors are from that time.
This calibrated circuit was found in documentation from the 1980s. It makes use of an integrated circuit...
This triac synchronized circuit was found in the July 1995 issue of Electronics Now magazine. The...
This high input impedance circuit makes use of two operational ones that are still common. The...