This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time and the frequency is determined by the crystal. The circuit operates at voltages from 3 to 9 V.
This IR light sensor circuit was found in the July 1992 issue of Radio Electronics magazine. It is...
Alongside the diagram of this control, which we find in a 1980s documentation are the component...
This circuit was found in an American documentation from 1968. The configuration can be adapted to...