Motorcycle headlight monitor (CB9117E)

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

Digital Photometer (CB4327E)
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
TTL Sawtooth Oscillator (CB12259E)
The presented circuit generates signals in a 1:10 frequency range depending on the Ct capacitor. See the...
Rocket Launcher (CB4447E)
This circuit, from a 1988 publication, consists of a timer that activates a relay at the end of a...