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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Wien Bridge Oscillator (CB4690E)
This interesting sine wave oscillator circuit for the audio track uses an incandescent light bulb...
Filter selection circuit with PIN diode (CB20933E)
Found in Popular Electronics from the 1980s, this circuit is intended for switching filters with...
1 to 100 mA Shunt Regulator (CB15573E)
The shunt type regulators are connected in parallel with the load, deflecting the current to...