Positive ground tachometer (CB9352E)

This circuit was found in RCA documentation from the 1960s. The circuit uses components from that time and can measure speeds up to 10,000 rpm.

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Digitally controlled mixer (CB9036E)
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FSK Generator XR2206 (CB24511E)
This circuit for low frequency data transmission was found in the May 1977 issue of Radio...
Automatic light (CB24332E)
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