A versatile and easy-to-build digital function generator for electrochemical applications is described. The instrument combines a 16 bit digital to analog converter (DAC) with digital control of the switching. Possible waveforms are ramp and asymmetrical or symmetrical triangle in single cycle or continuous mode. In the latter modes a timed delay at steady potential can be incorporated at the point of slope reversal. This is interesting for use in cyclic voltammetry to measure the reverse peak current when several electroactive species are present in solution.