Recent content by thunderaxe

a pot sweeps lug 2 (the wiper) from lug 1 (far left, CCW) to lug 3 (far right, CW).

do the MOSFETs produce noticeably more harmonics than the other clipping options? also, with the gain pot also being in the feedback loop, C13 interacts with it and really only comes into play in the highest gain settings, correct?

maybe it's just all the diode switching that's throwing me off, but what is the purpose of C13?

i would imagine that in a non-inverting soft-clipping stage like the tube screamer or the original dragon, while the clean signal is unity gain at the op-amp output regardless of the amount of distortion gain, still, the higher the gain, the higher the apparent volume, and thus the more the...

so by placing varying amounts of resistance in series with the clipping diodes, you are able to discourage the signal from getting clipped and thus to just pass to the output without clipping? that makes sense actually. why do you think peter went with non-inverting in the original design? is...

i'm curious what the reasoning was behind changing the clipping stage from non-inverting to inverting?

i think the 560R is just to put some series resistance between the op amp and the output jack when it's in bypass mode to protect the op amp.

...a hypothetical non-superbright simulation LED with a peak brightness at 10mA, i guess... multiply the resistor values by 10 to get a peak 1mA current

like so? https://tinyurl.com/25sytpmp

it bleeds off the bias current so that it goes to zero at the bottom of the sweep. i took the idea from the tremulus lune.

here's a simpler version of the LFO LED. if you're re-designing the circuit from scratch there are several other options you could go with as we've discussed previously in this thread, but if you just want to modify an existing pedal or PCB, this is probably the easiest way to do it while having...

here's the simpler version of the circuit i was alluding to in my previous post: https://tinyurl.com/2cp9mnko

i posted about a circuit that will work and will throb with the LFO shape and not just blink, on this thread. chuck replied that if he had to add a second op amp anyway then he'd just build a CE-2 style 2-op-amp triangle wave LFO which can drive an LED just as-is. if you don't want to build a...

can you elaborate on this?

i'm looking at the BE-OD schematic right now -- any idea why the bias for the first stage is set through an unbuffered VREF?