4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Differentiator for Negative Transitions (CB15692E)
The circuit suggested in the figure differentiates the signal from the negative front of a...
Crystal triple oscillator (CB8061E)
This frequency triple oscillator circuit was found in an American publication in 1967. The FET is...
6 V Lamp Astable (CB13718E)
This circuit was originally recommended for an electric oven warning system. However, we can use...