PUT shift register (CB20719E)

This shift register was found in old documentation. PUT is not a common component today. The circuit is low speed.

Pulsing Tone Generator 4011 (CB10743E)
Although it is a common configuration today, these circuits were taken from an old publication. The...
Police siren (CB7086E)
This oscillator version is from an RCA documentation from the 1970s. Transistors support modern...
Increasing zener voltage with LED (CB22134E)
In the figure we have the way to use an LED to increase the voltage of a zener. The increase...