This circuit was found in an Electronic World of 1968. The circuit uses power transistors of the time. The transistors are for 25 W of dissipation.
This first order Butterworth filter is tuned to frequencies around 1 kHz. The frequency is given...
S-meter is a signal strength meter used in radio transmission. Also known as Strength meter, in this...
Found in American documentation, this amplifier stage has unit gain and a high input impedance. It...