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.

Voltage Controlled Monostable (CB9423E)
The time constant for this circuit found in a 1973 publication is given by R and C. The shot is...
Shield for Digital Transmission (CB20175E)
This circuit was found in an American technical manual from the 1980s. The LM111 is an uncommon...
Power Outage Alarm (CB24152E)
This sensitive circuit was found in the August 1971 issue of Radio Electronics magazine. The SCR...