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 temperature sensor shield or interface was found in a PC English documentation from 1996....
This circuit was found in December 1983 Radio Electronics magazine. The maximum output current is 1 A...
The 74123 TTL integrated circuit consists of a monostable that can be configured to generate...