if you have circuit curiosity, check this interesting dual channel unity gain IC out:
https://www.mouser.com/ProductDetail/Texas-Instruments/P82B96P?qs=aEuGZpxfbxV0WPFsO7nJmg==
i'm curious if this is a valid IC to try making a stereo buffer for a 4 cable method-ish approach. perhaps one channel from the guitar and the other from the end of the mono drive pedal loop to the reverbs/delays/etc. then a 2nd IC for the stereo out of the stereo loop to recording interface.
thoughts on this chip?
here's the datasheet:
https://www.ti.com/lit/ds/symlink/p82b96.pdf
https://www.mouser.com/ProductDetail/Texas-Instruments/P82B96P?qs=aEuGZpxfbxV0WPFsO7nJmg==
i'm curious if this is a valid IC to try making a stereo buffer for a 4 cable method-ish approach. perhaps one channel from the guitar and the other from the end of the mono drive pedal loop to the reverbs/delays/etc. then a 2nd IC for the stereo out of the stereo loop to recording interface.
thoughts on this chip?
here's the datasheet:
https://www.ti.com/lit/ds/symlink/p82b96.pdf
After thinking about it some, i think that chip might not be good for what i mentioned. I need a hi-Z in and low-Z out on one and a low-low on the second for that. I'm sure i'd run into issues trying to maintain unity and transparency.
anyone have any suggestions on how to build a single circuit board that's small enough to fit under a pedalboard?
What I'm trying to do is build a pedalboard junction box with a guitar in, a post drive pedal out to a wet effects in that turns into a stereo out. the circuit would include jensen jt-11p-1 transformers to isolate the signal after the first buffer and before the wet effects in.
guitar->(cable)->unity buffer/voltage follower->iso transformer->(cable)->drive pedals->(cable)->iso transformer->unity buffer/voltage follower->(cable)->modulation/delay/reverb effects->(dual TR cables/stereo TRS cable)->dual unity buffer/voltage follower->dual iso transformers->(2 cables)->audio interface/dual amps
This is quite the endeavor when I look at it like that... sheesh.
Are there any fellow guitar nerds here?
anyone have any suggestions on how to build a single circuit board that's small enough to fit under a pedalboard?
What I'm trying to do is build a pedalboard junction box with a guitar in, a post drive pedal out to a wet effects in that turns into a stereo out. the circuit would include jensen jt-11p-1 transformers to isolate the signal after the first buffer and before the wet effects in.
guitar->(cable)->unity buffer/voltage follower->iso transformer->(cable)->drive pedals->(cable)->iso transformer->unity buffer/voltage follower->(cable)->modulation/delay/reverb effects->(dual TR cables/stereo TRS cable)->dual unity buffer/voltage follower->dual iso transformers->(2 cables)->audio interface/dual amps
This is quite the endeavor when I look at it like that... sheesh.
Are there any fellow guitar nerds here?
That chip is UTTERLY not what you want. (It pushes saturated logic levels, not analog audio.)
> I look at it like that... sheesh.
That reads like an implementation description, not a performance goal. Most stage-toys are designed to just plug one into the next. Why all those transformers? Why segregate the un-drive effects? I'm sure it makes sense to you. Maybe a sketch? Or explanation why the obvious path has real-life problems?
> Are there any fellow guitar nerds here?
And yes, you should probably hit the "!" triangle lower-left of your message and "report your post", ask a moderator to Move this to the Live Sound | Instruments and Amps section.
> I look at it like that... sheesh.
That reads like an implementation description, not a performance goal. Most stage-toys are designed to just plug one into the next. Why all those transformers? Why segregate the un-drive effects? I'm sure it makes sense to you. Maybe a sketch? Or explanation why the obvious path has real-life problems?
> Are there any fellow guitar nerds here?
And yes, you should probably hit the "!" triangle lower-left of your message and "report your post", ask a moderator to Move this to the Live Sound | Instruments and Amps section.
Last edited:
heh, You've just added more scrutiny criteria to my continued searching. I didn't know this was important.
yes. I still seem to be running into noise issues so my aim is to kill all noise and hum with extreme prejuice.. 😀 A Pedalboard has a lot of patch cables and dc power cables running next to each other. each cable and pedal introduces the chances of noise.
Done! 😀
-
I think I might forgo this route and use a premade Discrete high-Z unity gain OPamp. I realize how ignorant and silly this post looks now. the chip idea I posted has now evolved to the notion that I want a matched Dual channel unity buffer for the stereo effects out into my direct in/monitors/speakers/whatever.
In general it´s better to have all the distortion up front and later add the "clean", generally time/delay effects so they are clearly heard.
The opposite way turns such "subtle" effects into mush.
That said, yes, the envisioned signal path is needlessly complicated.
Transformers are not needed at typical stage distances and to boot are poorly implemented, with transformers at the sending end but not at the receiving one.
OP just needs to be careful with grounding, period.
And yes, most modern pedals have buffered or at least low impedance outputs, as well as buffered or at least high impedance inputs; unless a 1960´s germanium Fuzz originally used to record "Satisfaction" or similar pedals are used, modern ones are easy to interface.
Unless , say, they were modded to remove such buffers and rewired as "True Bypass" to get "Mojo" or some similar nonsense.
I do know why you distort first. Obviously my question is why the (multiple) interfaces on musical boundaries instead of interference boundaries.
I have not been on a Big Boy stage in many years, but I don't think our Guitar Gods who play a different stadium 200 nights a year have this much complexity IN the pedal board. Just for long runs OFF the pedal board (board to stage amp, board to house PA, reverb tank in concrete cellar).
Aside from grounding, box and cable shielding is important.
I have not been on a Big Boy stage in many years, but I don't think our Guitar Gods who play a different stadium 200 nights a year have this much complexity IN the pedal board. Just for long runs OFF the pedal board (board to stage amp, board to house PA, reverb tank in concrete cellar).
Aside from grounding, box and cable shielding is important.
"Musical boundaries and interference boundaries".. Good question. I should explain.. the pedalboard will be multi purpose, input buffer from first goes into the drives. Then another input that skips the drives for synth instruments input. An audiophile's pedalboard for everything. I have a DAW and audio interface and plugins but it's so tedious and unfun that I endeavor to build a silver surfer board. Cosmic travels my friends. I want to be able to plug into the pedal board and patch in at any multiple points without touching cables on any pedals directly and with the option of having isolation transformers preventing noise from synths or hairy drive pedals.
Basically a glorified junction box with input buffer and output buffer and absolutely zero chance of noise no matter what I plug into it and no matter what I plug it into.
Of course your two replies have revised my ideas. It's very much an idea I day dream about a lot while I work, with little to no circuitry experience other than tid bits I read here n there and study on my free time.
Would be nice to have a pedalboard that could handle everything you throw at it. Guitar, line level, mics, etc. How cool would it be to incorporate phantom power that comes standard in a powered, buffered and isolated junction box that's no more than 1.1" thick and fits under your board?! I'm dreaming lofty dreams, I know. Makes me smile though. Something like this probably already exists for a lot of cash but I enjoy building things and saving money while spending more money learning from dumb screw ups.. I'm trying to learn much currently.
Basically a glorified junction box with input buffer and output buffer and absolutely zero chance of noise no matter what I plug into it and no matter what I plug it into.
Of course your two replies have revised my ideas. It's very much an idea I day dream about a lot while I work, with little to no circuitry experience other than tid bits I read here n there and study on my free time.
Would be nice to have a pedalboard that could handle everything you throw at it. Guitar, line level, mics, etc. How cool would it be to incorporate phantom power that comes standard in a powered, buffered and isolated junction box that's no more than 1.1" thick and fits under your board?! I'm dreaming lofty dreams, I know. Makes me smile though. Something like this probably already exists for a lot of cash but I enjoy building things and saving money while spending more money learning from dumb screw ups.. I'm trying to learn much currently.
Last edited: