Code Switch (CB26086E)

We found this code switch circuit in the January 1999 Electronics Now magazine. Some of the components are integrated circuits from that era.

| 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...