Optical tachometer (CB9349E)

We found this circuit in a 1970 publication by General Electric. The components can be changed according to the indicator.

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567 Two-Tone Decoder (CB25791E)
This two-tone decoder has a bandwidth of 24%. The circuit is from a 1994 Electronics Now. The...
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Common Collector Stage (CB4937E)
This is a typical common collector amplifier step configuration. The transistor can be used...