Split the Difference: The Truth about the Humble Cathodyne

Vol 0 - Split the Difference: The Truth about the Humble Cathodyne.

Stuart Yaniger

Despite its extreme simplicity, the split load phase inverter is capable of stellar performance. It is also a highly misunderstood circuit, and these misunderstandings have led to some less-than-optimal design. In this article, we review the basics of its operation, derive the basic equations, and outline its advantages and disadvantages. Several versions of the circuit are built and characterized, including some dubious variations often recommended to "fix" non-existent (but commonly believed) problems. Output impedance, load tolerance, and distortion are examined.