Buffer for VFO (CB7282E)

This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3. Transistors are general purpose types.

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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...