Digital circuits use a digital signal instead of analogue. Digital circuits are the basis of all digital units, for computers, mobile phones, and numerous other consumer products. Digital systems interface well with computers and are easy to control with software.It is often possible to add new features to a digital circuits without changing hardware, and to do this, just by changing software. Find from Analog to Digital / Digital to Analog converters, Logic Circuits Readouts and many more. 100s of digital circuits for every hobbyist, technician, student, and design professional. An nice reference tool which includes lots of digital circuits. look at these circuit ideas, some of them may need some modification if they are to work as advertised. Ideas along with pretty good descriptions for each circuit.