- audio input
- audio output
- carrier input
Ken Stone's homepage
Four quadrant multipliers have more or less replaced ring modulators in synthesizers, even though they still bear the label "ring modulator". The distortion in these is lower than that of a true diode ring modulator, because the diode voltage drops have been eliminated. This leads to better specifications, though in a noise maker, this is not always desirable.
For years I have been building various four quadrant modulators, and have been satisfied with none of them. Not one of them had the raw sonic beauty of the traditional ring modulators I made when I was first starting out in synthesizer building.
For that reason I present here the "Real Ring Modulator", a traditional diode and transformer ring modulator. Each is hand assembled using matched 1969 germanium diodes (from a computer of the same vintage) and a pair of brand new 3k impedance transformers.
Bare printed circuit boards and kits will not be available - just the assembled ring modulator units. They are passive devices, and can be used as is, or integrated into more complex projects.
Carrier suppression is good, but not complete, so a compressor-expander could help if better suppression is required.