Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine. Resistor R1 should be chosen according to the table given next to the diagram.
The presented project is simple, but efficient in medium distance irrigation. In this circuit, the time...
This 2002 circuit uses many more electrical components than electronics. The keys are common, and...
This traditional mixer configuration with a high input impedance was found in a 90’s Popular...