Low Voltage Test (CB22158E)

This is a simple voltage tester for voltages from about 2V to about 15V with the indicated resistor and red LEDs.

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...