Inverter Amplifier (CB6431E)

This high input impedance circuit was found in a Popular Electronics of the 90s. The circuit supports modern operational.

Presence Simulator (CB18682E)
This circuit produces sequential outputs for the activation of several appliances in a residence, thus...
Simple Siren (CB240E)
Pressing and releasing S, the capacitor C1 charges and discharge slowly through the oscillator...
Wien Bridge Oscillator (CB4922E)
This circuit uses an operational that is not currently common. We found it in an old American...