This circuit emits a warning sound when night falls. The circuit is from a Hands On Electronics from the 90s. The Sensor is a common LDR and R6 adjusts the trigger point.
This space mark demodulator for FSK signals was found in an American telecommunication...
This circuit was obtained in Motorola documentation from 1969. The components are from that time. In...
This circuit was found in the February 1990 issue of Radio Electronics magazine. The gain is given...