10-Step Sine Generator (CB24472E)

This CMOS generator with the 4018 IC was found in a November 1976 Radio Electronics magazine. It uses a 741 op-amp as the audio amplifier.

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Ultrasonic ear (CB21314E)
This circuit was found in a Popular Electronics from the 90's. The output signal can be applied to a...
Using a Loudspeaker as Microphone (CB831E)
A small loudspeaker (2.5 or 5 cm) can be used as a low impedance microphone. A preamplifier and...
Transistor Flip Flop (CB20130E)
This flip-flop circuit with general purpose transistors was found in American documentation from...