Transistor Analyzer (CB21392E)

We found this circuit in a 1967 Electronics World. It analyzes a transistor by determining its type.

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741 Precision Full Wave Rectifier I (CB19115E)
This circuit uses two operational amplifiers, which can be of the type 741, in a full wave...
Video To Digital Converter (CB14553E)
This circuit converts video signals to digital form in frequency | Clique na imagem para ampliar...
Telephone Relay (CB5990E)
This circuit triggers a relay when the phone rings. An application is like remote doorbell. The circuit...