This circuit works with the previous two by demodulating the signals received modulated in FM. The circuit is from the Radio Electronics magazine of December 1992.
This traditional version of a double time constant dimmer using triac is from the 90s...
Operating in the range of 1.5 to 15 kHz, this sinusoidal oscillator is based on a 741 operational. The...
This circuit with only two transistors is from an 80's EDN. It can be implemented with two current...