Using a capacitor as a sensor, this circuit was found in the 1989 Radio Electronics Experimenter magazine. The circuit must be assembled in a shielded box.
Several analog TV channels operate with stereo audio signals, but the vast majority of receivers are...
Found in old documentation, this circuit uses components that are still common on the market. The...
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...