Using a sensor from the time, this circuit was found in the 1992 Radio Electronics Handbook magazine. The circuit uses a pair of integrated two-digit A/D converters.
Very strong audio spikes in a headset can damage the ear. This circuit, from a 90s Popular...
This circuit is suggested by National Semiconductor and can serve as a basis for an excellent...
This circuit allows 220 / 240V shavers to be used in the 110V network. The diodes can be general...