Voltage doubler (CB9442E)

Found in Radio Electronics from the 90s, in the figure we have conventional voltage doubler with common components.

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Operational Oscillator (CB5915E)
We have in the figure a traditional amplifier configuration with operational amplifier. The source...
10 s to 10 m sequential timer (CB1519E )
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...
Modulator with TAA111 (CB19432E)
This circuit is suitable for modulating small FM transmitters for eavesdropping or espionage. The...