7-bit 25 ksps Positive Logic Semi-discrete Successive Approximation A/D Converter with built in clock oscillator and Voltage Mode R-2R D/A Converter

An analogue/digital project that set out to construct and implement an analogue to digital and digital to analogue converter “demo” board, using semi-discrete components (ie, no A/D or D/A IC:s) and the archaic wire-wrapping technique. The function of each circuit block is described and the finished circuit presented with complete schematics and pictures. Oscilloscope images of key test points are included and the performance discussed.

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