Tamper-proof alarm (CB8963E)

This circuit was found in old English documentation. Components are common today. The circuit makes use of an optical sensor.

| Clique na imagem para ampliar |

Square Triangular Oscillator (CB24025E)
This circuit can be used in a toy organ. The frequencies are determined by the capacitors selected by...
Limit Comparator (CB5084E)
This circuit, which appears in this section elsewhere, is from an American 1980s documentation....
Photo Remote Control (CB18343E)
This very simple circuit uses a phototransistor and a very sensitive relay (reed type) being used...