Ring modulator forward voltage?

Conventional wisdom is that in a ring modulator — a real ring modulator, one with a diode ring and transformers — diodes with low forward voltage are preferred. Matthew Skala writes (PDF): in a ring modulator, higher forward voltages mean higher signal levels are necessary and there will be more tendency for the carrier to […]

Bissell envelope follower part 2

I tried replacing (in the simulation) the 2N3904s with MOSFETs. Not that I know anything about using MOSFETs. But the result looked a lot better: Here the gray trace is the EF output. Very fast rise, though it rounds off the sharp peak. One thing you might notice is the cap doesn’t discharge all the […]

Bissell envelope follower

I decided to breadboard the Harry Bissell envelope follower, which uses a much different method than the common rectifier and filter approach. Bissell’s claim is that it yields fast response with no ripple. The article describing it is here (PDF, on pages 2–3). I get the general idea of what Bissell is doing here though […]