The paper gives a general introduction to a new technique of using silicon controlled rectifiers in ring counters for polyphase sine-wave generation based on the experimental observation that such waveforms occur across diametrically opposite output terminals of a multistage ring counter having an optimum network geometry. A specific application of this-principle in the form of a d.c. to 3-phase a.c. sinusoidal inverter is then described in detail, the design and evaluation data of a prototype 30 V d.c. to 240 V, 60 VA per phase unit operating at 400c/s being presented as an example of practical design.