On Sat, Jan 16, 2016 at 05:26:11PM -0500, alfred.pear at gmail.com wrote: > hello SDIYers, > > i'm currently trying to figure out how to get reasonably affordable > transformers for a passive ring modulator. > Why not just make a proper four-quadrant multiplier out of a couple of opamps and an LM13700? -- Gordonjcp MM0YEQ