This bench circuit was found in Radio Electronics magazine from June 1958. The circuit does not have an external power supply. The circuit generates signals from 12 Hz to 180 kHz in 4 bands.
This circuit uses discharge tubes as active elements. The circuit is from a 1960s Signalite...
This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to...
I found this circuit in a Popular Electronics from November 1993. It allows to use a 12 V x 1 A...