This circuit was obtained in a 80s RCA documentation. The circuit uses components from that time. These components can be replaced by modern equivalents.
This simple receiver with junction FET uses a high impedance magnetic earphone (over 2 k). Power...
This HeNe laser power supply was found in the March 1989 issue of Radio Electronics magazine. This...
This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz...