Smart Charger (CB26305E)

This circuit was found in Radio Electronics magazine from the 90's. The circuit is for small NiCad batteries.

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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...