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okay, up to this point i haven't really understood why to use VREF as the ground rather than 0V, and to be honest i'm still not entirely clear on it. in my circuit the clean signal gets a non-inverting op amp to maintain the same phase as the dirty signal, which means it gets a DC bias injected...

i definitely want the clean signal to be boosted at some point, so that it can compete with the dirty signal, especially since it will be pre-volume control. that would be the reason for having a smaller resistor for the clean side of the mixer, but you're saying that would cause the dirty...

it works perfectly in the falstad simulation (except that for some reason i can't get rid of the +4.5V bias on the clean signal when i monitor it on its own... doesn't seem to affect the output negatively though). but on the breadboard it behaves like i described above

i tried using a URL shortener and it didn't work but clicking this ungodly long URL should...

@jesuscrisp @cdwillis i've breadboarded the additive clean blend how it's diagrammed in the first post (with one exception -- i didn't have a 470R resistor so i used a 560R instead), and it isn't working as intended. with lug 1 of the B5K pot tied to VREF the signal is very quiet even at max...

so the circuit i'm working with is actually the keeley rotten apple (pedalPCB "sour grape"), which just uses a TL074 instead of the 741/4558 combo of the original op amp big muff and as such doesn't use the two different bias points. i also saw no reason to have a dedicated voltage divider for...

would the C25K pot at maximum resistance effectively remove the clean signal entirely or just attenuate it to the point where it wouldn't be noticeable? and if the latter, would it still be quieter than having it express itself through the bias voltage?

in a similar vein to this, i've mocked up adding an additive clean blend to an op-amp big muff-derived circuit in falstad, and one problem i've found, at least in the simulation, is that grounding out the clean signal to VREF, which is also being used to bias the op amps, means that even when it...

so i've mocked up adding an additive clean blend to an op-amp big muff-derived circuit in falstad, and one problem i've found, at least in the simulation, is that grounding out the clean signal to VREF, which is also being used to bias the op amps, means that even when it is grounded out it...

the pedal i'm looking to do this to is the sour grape (keeley rotten apple) but i don't think that actually matters so much as the way i'm planning on wrapping a clean blend around it, so my plan was to have an op amp buffer up front: though, as mentioned in the first post i don't know if it's...

okay, i traced the paths, it's pretty much the same idea as mine except with two differences: 1) the switch between buffered and true bypass is a 4PDT, and the other two poles switch in the two resistors at the bottom when it's in buffered bypass mode. i don't really understand what those do...

i'll look into the cygnus switching and see if i can wrap my head around it, but in the meantime: if i was really committed to the switchable true/buffered bypass, obviously the easiest thing would be to just give it its own switchable buffer op amp dedicated to the bypass path. but honestly i...

^ ooh, i like this idea. adding a parallel resistor changes both the total resistance and taper of the pot, and this is a rare instance where both things would be useful to you

the panner can be found here: http://www.geofex.com/Article_Folders/panner.pdf if your browser is like mine you'll have to open it in a new window and then get a warning message saying it can't be downloaded securely (presumably because it isn't from an HTTPS server) and choose to save it...

lower pot value. the lower the pot value, the less separation there will be between the extremes of the pot. remember that an M/N pot is actually two pots, with both being at 100% (or 0 resistance) in the middle. so if at 49% and 51% of the pot's rotation you can only hear one or the other...

hi all, i'm interested in the idea of adding a clean blend to an existing distortion effect, and i'm wondering if it's possible to also use it as a switchable buffered bypass option. with the help of this very useful tutorial by @jesuscrisp...

i'm interested in adding a clean blend to an existing distortion effect. pretty certain i'm going to go with a dual op-amp version, but i'm not sure if i'll be doing the 100% dry to 100% wet version or the purely additive one. i had a couple of questions though: 1) are there particular...

if i were to use VREF in all the places you suggested, but wanted to create an asymmetrical clipping control that changed the bias voltage on the clipping stage op amp, i would need to create a separate voltage divider with its own conditioning cap and a pot to vary one half of the voltage...

yes, that fourth op amp will definitely be used, for either an active baxandall tone section, or a clean blend buffer. speaking of the latter, would a separate buffer for the clean blend still be necessary if i instead took the clean signal from after the first gain stage?

haha yes, we were both talking about the sour grape. i see C2 in the dream fuzz directly attached to the voltage divider, but i was referring to C2 in the power section of the sour grape. i assumed it was there to get rid of any noise or ripple. do we need another one attached to the ground side...