This 3 A adjustable source uses the LM350 integrated circuit, which must have a good heat radiator. The circuit is from 80s documentation and has been explored in other versions on this site.
We adapt this circuit of Radio Electronics - March 1990. The magazine no more exists, but the...
The input impedance of this circuit is about 700 k ohm and the output impedance is about 1 k ohm....
Radio Electronics magazine published in a 90's issue this simple alarm that can use any general...