This all-analog circuit provides three key waveforms simultaneously and at the same frequency within the audio band. It is useful for evaluating audio systems, transformers, cables ...

Fortunately, the function generator accepts an external clock which can be used to increase its accuracy, so he decided to build one.

[Joekutz] wanted to re-build an audio-rate function generator project that he found over on Instructables. By itself, the project is very simple: it’s an 8-bit resistor-ladder DAC, a nice enc… ...

Using these curves, designers can match devices, determine their transconductance and output resistance, and accurately bias JFET-based amplifiers.