10 MHz counter (CB20128E)

This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a selectable output.

| Clique na imagem para ampliar |

Fluid Level Controller (CB5309E)
This circuit, which can be used as a shield, was found in a 1980s documentation. The circuit can be...
Simple TTL Power Supply (CB1161E)
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
Touch Switch (CB6028E)
This switch is triggered by the touch of the sensors, which can be two metal plates. These plates...