AC voltage control (CB8904E)

This circuit was found in a 90s Hands On Electronics. The semiconductor component is a Triac of the time.

Current limiter for charger (CB9544E)
Found in a manual of integrated circuits from the 90s, this circuit makes use of that time...
Lightning Lamp (CB6884E)
This 2004 circuit is based on the ionization effect that occurs in old incandescent lamps with...
Logaritmic Amplifier (CB3931E)
We found this circuit in an old 1980s documentation. The circuit can be implemented with modern...