This circuit is from a Radio Electronics from October 1970. The circuit uses transistors from that era and has a low impedance output. The resistance R1 depends on the impedance of the input signal.
This traditional metronome configuration uses unusual transistors in the original version, but it...
This circuit was found in Texas Instruments documentation from 1968. The transistors are from that...
This sensitive field strength meter was found in 1993 documentation. The instrument may be the...