The purpose of this circuit is to limit noise peaks on a radio receiver. The circuit is from an 80's documentation. The diode is commonly used and the circuit is applied to a receiver IF stage.
This source circuit, published in 1988, incorporates a timer with integrated circuit 555. In this...
This beacon causes an LED to flash with the mains voltage. The frequency depends on the capacitor. For...
Found in a 1970 EEE, this circuit uses general-purpose transistors of the time. Transistors support...