Battery Charge Indicator (CB26002E)

This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.

| Clique na imagem para ampliar |

Transistor voltmeter (CB20582E)
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
Water level sensor (CB20727E)
Found in old American documentation, the components used are still common. The circuit directly...
Variable Active Cycle Frequency Doubler (CB5027E)
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...