4093 Sine Square Converter (CB26335E)

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

Sequential 6 LEDs (CB20454E)
This circuit uses only transistors, producing a pseudo-sequential effect with 6 LEDs. The circuit is...
Unijunction Pulse Generator (CB24252E)
Timer Very Simple (MSB059)
A capacitor stores electrical charges. This component is formed by two metal parts called...