Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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LED Moving Bar or Dot (CB9712E)
This is a typical point scale or moving bar circuit with the LM3915. We found it in old American...
Slow Start for Model Railroad (CB4723E)
This circuit simulates the actual departure of a train as the speed increases slowly. The power...
12-Bit A-D Converter (CB5025E)
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...