BIGGER MUFF  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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JiM
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Post by JiM »

Yes, for sure.
But for some reason i like the idea of misusing a digital device for analog dirt ... :mrgreen:
(cf. my latest build)
I only give negative feedback.

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dylan159
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Post by dylan159 »

JiM wrote: 14 Apr 2021, 18:36 Yes, for sure.
But for some reason i like the idea of misusing a digital device for analog dirt ... :mrgreen:
(cf. my latest build)
That's the right word and I enjoy it too, like in the fairglass.
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
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Paul_5
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Post by Paul_5 »

:(
The sounds in my head don't match the sounds from my amp, I guess that's why I'm here...

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Paul_5
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Post by Paul_5 »

You seem to have an extra cut on the component side on the top row (A6) - is this missed off the mirrored side in error?
The sounds in my head don't match the sounds from my amp, I guess that's why I'm here...

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dylan159
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Post by dylan159 »

Paul_5 wrote: 12 May 2021, 21:20 You seem to have an extra cut on the component side on the top row (A6) - is this missed off the mirrored side in error?
Hm yeah good eye, I think it's because when i reworked the gain control I didn't update the copper view. Just that though.
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Paul_5
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Post by Paul_5 »

Cool, just checking.
What sort of voltage should I be seeing at Q3?
The sounds in my head don't match the sounds from my amp, I guess that's why I'm here...

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dylan159
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Post by dylan159 »

Paul_5 wrote: 12 May 2021, 22:25 Cool, just checking.
What sort of voltage should I be seeing at Q3?
All pretty close to 9v, it really doesn't drop much more than a diode drop. Vbe applies of course.
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Post by Paul_5 »

Just been playing about its this for bass guitar, and I reckon I've got my favourite sounds By changing C14 to 2n2, and C15 to 33n.

What a great little pedal - Kudos to dylan159 for sharing.
The sounds in my head don't match the sounds from my amp, I guess that's why I'm here...

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dylan159
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Post by dylan159 »

Paul_5 wrote: 13 May 2021, 13:47 Just been playing about its this for bass guitar, and I reckon I've got my favourite sounds By changing C14 to 2n2, and C15 to 33n.

What a great little pedal - Kudos to dylan159 for sharing.
Why thank you.
Interesting. The 2n2 has to make it darker. C15 is intended just as dc blocking and lets all frequencies pass, but reducing it makes a permanent high pass which should reduce some flub without ruining output impedance.
Little pedal? How dare you, it's BIGGER :lol:
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Lukasen
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Post by Lukasen »

Cool project!
I also have one on the breadboard and I like the version with 100 nF capacitors almost everywhere around the circuit (inputs, outputs, feedback before the diodes). However, I only have the first three stages without tone regulation, so this tempts me to connect the scheme mentioned above.
But what my version has compared to others are 360R//22uF (ceramic SMD) in all emitters, 1N916 in the first stage (larger filtration) and 1N4148 in the second stage (smaller filtration). Overall it works: a little less gain, more solid bass frequencies (no rumble) and more "color" in the middle thanks to different diodes.

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Mandalore_15
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Post by Mandalore_15 »

dylan159 wrote: 08 Apr 2021, 19:20 And finally the tone control, which is something I'm proud of. I didn't like the idea of a lossy tone control followed by a recovery stage when we could have an active one by means of op amps and feedback that doesn't need that. A friend mentioned a trick to make any tone control active which was right what I wanted, so I took the muff tone control and made it active! That's the kind of thing that has been made easy by op amps and we can do to take the design into the future. I let myself use some less standard values than I like to copy the values in the NY muff tone control, and the only other addition is an "AMZ presence" mid control to have continuously adjustable control over the midrange overlap. Here's the simulation plots comparing this active version to the passive one using the same values:

tone.png

and with the mids pot at full:

tonemids.png

As you can see they're very similar, but without the losses and with a stronger effect. I'm not saying it's an improvement because that would be subjective, but I can say that the result is quite pleasant, faithful to the original, and works very well. Also in one go we solved the gain recovery problem and also got a very good output impedance with it.
Hey Dylan, I'm really interested in learning more about that tone control! I had a few questions about it:

1. What is that 220n cap at the front of it doing? I've never seen that in a BMP tone stack before!

2. Will the same resistor/cap values in this active stack give you the same frequency curves as they would in a traditional passive BMP tone control (just without the volume loss)?

3. Will this work fine with other dual op-amps, say an LM1458?

Thanks!

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dylan159
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Post by dylan159 »

Mandalore_15 wrote: 17 Mar 2024, 16:56 Hey Dylan, I'm really interested in learning more about that tone control! I had a few questions about it:

1. What is that 220n cap at the front of it doing? I've never seen that in a BMP tone stack before!

2. Will the same resistor/cap values in this active stack give you the same frequency curves as they would in a traditional passive BMP tone control (just without the volume loss)?

Thanks!
1. the cap is just blocking DC, something not necessary with the passive arrangement;
2. more or less yes, but simulation is your friend. I had to shift the center point for them to match well (R20)
Personal blog/archive: https://bentfishbowl.wixsite.com/electronics
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