Roman numeral display (CB22160E)

This circuit shows numbers I II and III when mounted on its side, depending on the position of the selector switch.

3 kHz Low Pass Filter LM3900 (CB13837E)
This filter was found in an old publication from 1977. The circuit must use a simple two-voltage source...
UCN5804 Stepper Motor Control (CB17184E)
This circuit produces paced steps of an engine whose speed can be adjusted in the trimpot. The key on...
Simple Rhythmic LED (CB16371E)
To make a single LED flash in time with your amplifier's music, we have the circuit given below. The...