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.

Nuclear Particle Detector (CB5927E)
The sensor of this circuit is a large surface diode. We believe that a small solar cell can also...
Old Transistorized Preamplifier (CB18850E)
This stereo circuit is from Japanese 1960 documentation. The circuit was originally designed to...
Serial Port Stepper Motor Control (CB15386E)
The circuit shown in the figure makes it possible to control a stepper motor via the serial port...