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.

Digital Multimeter (CB16455E)
This is a traditional commercial circuit that can be assembled if the reader finds the components used....
Transformerless Power Sup (MSB001E)
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...
Frequency-based code key (CB20927E)
This code key uses a PLL and an oscillator that generates two frequencies that must be recognized for...