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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Commercial Silencer (CB16954E)
With this luminous remote control, which we found in a 1990 publication, using a flashlight you...
Lamp driver (CB9286E)
We found this circuit in a 1967 Electronics World. The circuit can be designed to control other...
Signal Weighting Circuit (CB25965E)
This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now...