Motorcycle headlight monitor (CB9117E)

This simple circuit was found in Popular Electronics from the 1980s. The circuit uses an LED as an indicator.

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...