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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12 V x 700 mA variable power supply (CB8676E)
This circuit was found in a 1967 Electronics World. Transistor Q1 can be a TIP321 and Q2 can be a...
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Divider by 8 (CB12982E)
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