Obtained from an English publication in the 1980s, when a weather station operated in that country at 60 kHz, this circuit employed only two general-purpose transistors.
This zero-crossing circuit was found in the 1989 Radio Electronics Experimenter. The Triac must be...
The basis of this 90s circuit is a CA3130 operational amplifier. The circuit does not need a...
This circuit, found in a 1979 documentation, consists of a small inverter that applies a voltage to...