4093 Sine Square Converter (CB26335E)

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

Contactless ignition (CB6381E)
This circuit is from a 1965 Motorola documentation. The transistors are of the time as is the...
Triac photoelectric control (CB8274E)
This circuit was found in a 1966 General Electric book. The triac and the day are from that time...
Exponential Attenuator (CB13835E)
The purpose of this circuit is to modify the sound of organs so that they resemble the sound of a...