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I think it's going to be "to taste"...your preference.

If you goose your amp with a booster (like, punching a tube amp with it), then I'd put that just before the amp....but that's MY setup, and yours is going to be up to you.  There are no real rules for much of this stuff!  :)   My crap is bright enough, I WANT the 20' of cord and a non TB wah to warm it up a bit...
Show us a schematic and we might be able to tell you. Otherwise, we'd just be guessing.

I have the little black buffer on my board now after Wah and fuzz in a small enclosure.  It works well, adds some clarity, I just want the buffer to retain my signal driving 10 true bypass pedals and 20ft cable.  I donít have any boss pedals, they are all true bypass until one is engaged.

With the boost, I just want a simple DB clean boost as I already have a TS type pedal for a mids boost.  I like how the fat boost you can adjust the gain and volume dials to best suit either humbuckers or single coil pickups.

Building the buffer circuit into the boost would save some space on my board.

Thatís pretty much my objective.
Building your own stompbox / Buffer before amp TDA7231 produces no sound
« Last post by Ksander on Today at 02:37:01 PM »
Dear all,

Its not a stompbox, but I guess people here will be familiar: I'm experimenting with variants of the ruby amp, and have found some TDA7231 amplifiers instead of the 386. I've tried the schematic from the datasheet with a guitar as input, which works fine, and I've also tried putting two in bridged mode, which also works. Now I want to put a buffer in front, to play around with the gain and implement some filtering. However, when i put a basic jfet (j113) or op amp (tl072) buffer (as described on the muzique website) in front of the amp, I get no sound. I know the buffer works, because I've tried it in isolation.

Why might this be?
Building your own stompbox / Re: Critique my guitar/bass preamp
« Last post by fryingpan on Today at 02:06:12 PM »
> H) I'm not sure that U6a is configured properly. I feel it needs one big resistor in between - pin of opamp and wiper of TP2.

> H) why? It's just an inverting opamp.

Let's look at the situation where trimmer wiper is at the very top

Pin 1 of U5A is the voltage source. That means there is no resistance in series between the voltage source Vin and the - pin of the Opamp. Or maybe 0.000000001 ohms of trace resistance.

The gain of that opamp U6A then depends upon internal impedance of the Opamp and the feedback resistor. I expect extremely high gain (Close to open loop), but I am not sure.

Please consider the part in red (5 to 10 times larger than trimmer TP3 value) :

The idea is that the trimpot is never fully to ground, and is only there to allow for attenuation into the opamp. That said, I could very well set the trimpot to a fixed value (eg. 10kohm) and adjust gain using the trimmer only (a 22k trimmer for example), considering that headroom is very high being a dual +/-15V power supply.
Does this imply there will be a fresh release of SpinCAD Designer soon? Digging these new verb and delay blocks you're working on.
Why yes it does in fact Mr. Cow!  It's scheduled for next week and at the moment it's only for subscribers. Part of that is down to me forgetting how to check things into Github, and the fact that the current state of the code (several things in half-baked form) is not suitable for a full release.


If you want "the best" digital reverb code for the FV-1, I suggest that you search out the code examples supplied by Spin themselves.  However, one very interesting patch is the "mini reverb" which accomplishes a stereo reverb in only 22 instructions.  This gives you plenty of room to do other things while still having a reverby sound available. 

For years I have looked at the delay line lengths and all-pass lengths and coefficients in every example I could find and just thought of them as "magic numbers" as I could not find any objective strategy for determining them.

Auditioning different combinations via trial and error with Spin ASM is very time consuming as you would need to come up with up to 8 different settings, make 8 different files, build them and upload them to the chip, audition them and take some notes, then try to figure out where to go from there.

I've come up with a block in SpinCAD (version currently unreleased) that lets you adjust nearly everything in the small reverb and audition it immediately without writing code and without having to burn it into a chip.  Even if you don't want to subscribe to my pay site I think you will find this interesting.  I sure did!

Does this imply there will be a fresh release of SpinCAD Designer soon? Digging these new verb and delay blocks you're working on.
How about using non inverting opamp setup and make the resistor to ground variable? (Or "Vr"/"bias" or whatever it is called if using single supply.) That way you could tune the pickup loading for how you like it with whatever guitar you are using. It would still have to be the first in your effect cahin though to work meaningfully.

The suggested filter after the opamp stage would allow you to place it anywhere in the chain and control that top end. Is a simple filter the same as low impedance loading the pickup? There is always the cable capacitance and guitars tone control cap which could produce a resonant peak with the pickup and loading taht combination down could possibly affect that resonance in a different way than just a filter after the preamp stage. The difference is probaly very subtle though. (How low impedance input affects the guitars volume control is not though.)

like this. still centre off, spdt. as for the osc slower, you only need single pole single throw - but use a single pole double throw anyway, cause you've got those. my eyes are grinding, so I'll leave the circuit to vero translation to ..... well, anyone.

cap stays away from the base, don't be cutting there. no sleep till xmas.
If you own any Boss pedals, they're buffered when they are not could mess around with one and see if you prefer a buffer pre or post FX...

Or just wire up 2 buffers on BB, and try them before & after...low parts count and a good experiment to see what each does to your tone.
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