This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This circuit converts the 12 to 13.6 V of a battery into 6 Vwith current up to 1 A. We can use it...
The purpose of this circuit is to amplify the signal of a phone pickup and to be able to reproduce the...
This circuit was found in a 1980s documentation. Modern operational amplifiers can be used. The...