Optical potentiometer (CB22159E)

This voltage-controlled potentiometer using an LDR was found in an English documentation. LDR is common and LED of any type.

TTL Oscillator (CB9097E)
This low frequency circuit was found in documentation from the 1980s. The values of R and C...
12 V x 10 A Power Supply (CB18219E)
This source for devices for automotive use was found in a 1985 documentation. The power...
Air Pressure Change Sensor (CB6528E)
Found on Popular Electronics in the 1980s, this circuit detects a change in air pressure using a...