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 |

Hybrid amplifier (CB23801E)
In the figure we have the diagram of an amplifier stage using transistor and a 6AQ5 valve. The...
Fast half wave rectifier (CB9692E)
Being able to operate with frequencies up to 100 kHz, this circuit was found in a 90’s...
Immobilizer for car (CB24478E)
This circuit immobilizes a car with an old ignition system with platinum switches. It was found in the...