The FETs of this circuit can be the BF245. The circuit is from an old documentation and can be used in the amplification of infrasonic waves, of a sonic attack, for example.
This sole beacon which has a battery charged by photocells was found in documentation from 1991....
The supply voltage of this circuit can be between 4 and 20 W. The power depends on the voltage and the...
This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The...