3-way control (CB7047E)

This is a simple circuit to control a set of lamps from 3 different points. We found it in an old Popular Electronics.

Twin-T Oscillator Using the 741 (CB249E)
An excellent low frequency sine signal is produced by this oscillator. The frequency is determined by the...
Narrowband VCO (CB25248E)
Using the 4046 PLL integrated circuit, this circuit generates signals from 60 Hz to 1.4 kHz via...
86 dB Gain Stage (CB6118E)
This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz...