This DIY piece of test equipment combines a variable DC voltage reference, a programmable function wave generator, and a fully functional frequency counter, and it costs less than $150. It started out as a microcontroller controlled variable voltage reference using just a PIC, a fixed voltage reference, and a digital-to-analog converter. But then, it expanded to include a programmable function generator that can produce a sine wave, triangle wave, square wave, etc. Then further to include a frequency counter to measure the frequency of the function generator output.
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