Photo relay with LDR CIR23521S CB23821E (CB23821E)

I discovered this circuit in Radio Electronics magazine in 1962. The circuit drives a special control motor. Power comes from the power grid.

| Clique na imagem para ampliar |

Undervoltage protection (CB8028E)
Found in 1967 Raytheon documentation, this circuit uses a company coupler consisting of a lamp and...
Universal Crystal Test (CB21786E)
In a modern version this circuit can use an LED in series with a resistor in place of the lamp. The...
Simple Locked Alarm (CB18097E)
This circuit, when triggered, locks, and remains so until the source is switched off for a moment or...