Maybe it's intended to keep the signal level low and minimize distortion, when using the mosfets as VCR.

The Marshall 200W tone control is inside the feedback loop.
https://el34world.com/charts/Schematics ... d_200w.pdf
It always seemed strange to me...

The discrete opamps in the OD-2 have a lower power supply (5.6V versus 8V on the OD-2r). This pedal is a candidate for an integrated opamp version, like the dylan159's "blue pilot".

Well, the Emma is a Dynacomp with mods. https://www.freestompboxes.org/viewtopic.php?f=7&t=4340&hilit=emma And the Dynacomp is actually a limiter, not a compressor. The pot changes threshold. There's a plot of the limiting curve of a Dynacomp with the pot on max and min on the trhead about m...

Well, the "sustain" pot is already a threshold control. (and btw the "attack" pot is actually a release control - see the emma transmogrifier for proper attack/release controls) You may want to investigate how to add a "ratio" control to this circuit, this is a mod I've...

Thanks, that's close to how I imagined it.

Please forgive if I insist on the matter, I'm not looking for "deffects" on your design or something like that, I just want to understand the circuit and know the best ways to use it. Looking at the blue curve, if I set the threshold for 100mV for example, to plot the new curve I Imagine I...

Merlin, The blue line in your graph shows what happens with a high ratio (limiting), low threshold. So it works like a sustainer, like we are used to with guitar "compressors". If I wanted to use it with as a limiter, with the high ratio, but with a high threshold, so that I was just tamin...

I guess they feel interactive because the ratio control changes how much gain for signals below the trheshold. If you have a compression curve like this: http://www.radialeng.com/whbeta/images/komit-dev-flexknee-1.jpg A non-interative ratio control would be able change the slope of the curve after t...

can you post the voltages at each node?

Thats for the article! :D Here some more joyful reading on this fascinating subject (at least for a nerd like me): "Audio Dynamic Range Compression for Minimum Perceived Distortion" Barry A. Blesser IEEE Transactions on Audio and Electroacoustics, vol. AU-17, No. 1, March 1969 "On Tr...

The cab simulation is driving me nuts! Looks like all the Legend series have the same cab sim circuit.. :scratch: I have bread boarded it about 3 or 4 different times trying all sorts of crazy crap but still get nothing? I think the schematic is missing something...? Can anybody flex their brain mu...

A lot of people complain about digital fx, recording interfaces or guitar synths that have latencies around 8-10 ms, or even less. Studio gear, if you're not doing "software monitoring", can have a much longer latency with no problem. For a guitar compressor, no latency is way more importa...

rocklander wrote:is that seriously a 2 component amplifier? just seems too simple

Check this:
http://www.ssguitar.com/index.php?topic=1630.0





10W x2 (stereo!).

If I had to guess how ANY compressor with a fast attack and a relatively slow release would behave with a signal that has a short, large transient, a fast decay and then a much lower sustain level, such as aguitar note, I'd bet it would completely lack overshoot, like above, BUT it would have kind o...

Almost a nice idea, but unfortunately there's rather a lot of "prior art": Hey, that's mine :) It's from 1990. There's an error on the drawing, swap inputs +/- on U9A. I only tested it on bass, I liked it. BTW later I learned there was a (supposedly very nice) MXR studio limiter that used...

I've simulated it (only the speaker simulation, not the whole pedal) in LTspice. Seems OK, but a bit dark. It may be difficult to bias, the only fet model I have that worked was a J201 (specially for the second fet, the common source at the stage which has the CRC "T" in the feedback - the...

Sorry to bump such an ancient thread. But I think we were looking at the wrong patent: http://www.google.com.br/patents/US7397303?printsec=abstract&dq=korg+tube&ei=khl_T7CQGYnDgAef3MSHCA#v=onepage&q=korg%20tube&f=false This one matches with the actual schematics. Look at fig. 2, very...

At R$ 120 it may be cheaper than to import the switch and a hammond box...

Some background. Gil Ayan used to post in Ampage and in the Boogie Talk mail list. I think a couple of the Mesa Boogie schematics that are on the net were contributed by him. From what I remember, the S&S was not a proper "business", it was more like someone at the boogie list would e-...