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.

Under-temperature switch (CB9357E)
Found in Radio Electronics from the 90s, this circuit uses a thermistor as a sensor that can have...
Electronic Bargraph Scale (CB16655E)
The scale of this scale uses LEDs, and its accuracy depends on the number of LEDs. We found this...
Burst generator (CB21067E)
Found in American documentation from the 90s, this circuit generates sound bursts according to the...