Visual dial indicator (CB9300E)

This circuit was obtained in a Popular Electronics of the 90s. The circuit can be assembled with equivalent components.

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Line voltage compensation (CB8816E) This circuit for the alternating current line (AC line) was found in a 1965’s General Electric documentation. No information was given about the transformer. a href="image"
Line voltage compensation (CB8816E) This circuit for the alternating current line (AC line) was...
General Purpose Preamplifier (CB10980E)
This circuit was obtained in a 1982 English magazine of 1982. This circuit has three external...
Transformerless Microphone Preamplifier (CB14384E)
This circuit is based on the operational amplifier LM833 which is not a common component today. The...