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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  'SPITFIRE' Metal 'n' Blues Pedal... 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: 'SPITFIRE' Metal 'n' Blues Pedal...  (Read 67246 times)
WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #200 on: February 07, 2012, 12:09:35 PM »

You might try a 220pf or 100pf instead of the 470pf if it gets too bright. 

You guys are building some gorgeous pedals.  Wink
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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #201 on: February 10, 2012, 05:34:13 AM »

just been tweaking a little...as the tone control goes too bright imo......

so i'm trying resistors across pin 3 -1 on the tone pot using my resistor sub box......very tweakable..as long as i don't lose any bass too.. icon_cool


@ian: i tried cutting one leg of the 470pf.. just to try that....didn't hear any noticable difference...soldered it back..


try the pot resistor mod ..very noticable........i'm not settled on a value just yet as there are a few possibilites.... icon_twisted  back later...i'm on it now!!!!... Wink


8.2k - 10k sounds pretty cool...


edit: 5.6 k seems to be best....btw i stuck with a 47k lin pot, and a 4.7n-6.8n cap selection..... icon_twisted
« Last Edit: February 10, 2012, 05:55:20 AM by deadastronaut » Logged

WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #202 on: February 10, 2012, 12:45:42 PM »

With the caps across the pot, it does nothing at max.  Turn it down 1/2 and you should be able to hear the treble boost effect that it creates.  470pf may be too much 100pf may be to little.  It's used in guitar amps as a bright switch typically.  Wink
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Ronan
Posts: 632

Ian


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #203 on: February 11, 2012, 12:59:31 AM »

Here's a rough sound clip with a digitech synth wah thrown in on top of the spitfire in the last few seconds. Sorry bout the guitar playing guys, best I could manage today Wink
« Last Edit: February 11, 2012, 01:04:29 AM by Ronan » Logged
deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #204 on: February 11, 2012, 03:21:01 AM »

@wgtp..oh i see...

@ian.. cool,..not  effin satriani.. Cheesy....don't apologise, sounds good man!....love that wah too... icon_cool
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WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #205 on: February 11, 2012, 05:35:03 PM »

Robert, I hope you don't mind.  After further study of Mu/Srpp gain stage behavior to cap/resistor changes, I refined my mods to add a little more SPIT and included a BSIAB2 mod (converting Q5 from a buffer to a gain stage)(in RED) to add some more FIRE.   icon_twisted

http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1
« Last Edit: February 11, 2012, 05:56:10 PM by WGTP » Logged

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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #206 on: February 12, 2012, 08:53:53 AM »

@wgtp:  cool...i'm all  for more improvements.....any clips?... Smiley
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Ronan
Posts: 632

Ian


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #207 on: February 13, 2012, 05:18:56 AM »

wgtp, Q5 still looks like a buffer, cap in wrong position maybe.

Rob, I tried the circuit with no tone control but left the dual 2K2 and 2n2 low pass filters in place. Sounded quite good, and maybe a bit strong in the mids. The original tone control has been put back now, but it made me wonder, what if a simple mid cut control were used, as well as a straight treble cut aka the Crunch Box . The treble cut, or not cut, might give a balance between bass and treble, and the mid cut control would fill in the hole in the middle. Just ideas...
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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #208 on: February 13, 2012, 05:36:37 AM »

yep thats very similar to what wgtp was suggesting early on with this project,

i did do a layout which was just the distortion with no tone at all, to be like a distortion module, that could have any tonestack added...(i wish i'd built that now just for experimental purposes...

i see what your saying.. Wink  i haven't got this on bread at the moment, as i'm working on other stuff, as soon as i finish that , i'll get it boarded again
and do some more experimenting!.. Wink
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WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #209 on: February 13, 2012, 02:00:45 PM »

Whoops, forgot to move the output of Q5 from the source to the drain.  Thanks.  It's fixed.  Wink

As a bonus, I added a FAT mod that boosts the mids and almost makes the tone control flat at the mid point.   icon_lol

Any cap size from 2.2n to 22n can be used there for varying the mids and action the control.  Pick the 2 values you like for the switch.   icon_eek

Replacing R13 with a 25-50k pot will function as a Bass/Mid control and should be very useful for many different tones.   icon_smile

Keep spitting fellow Dragons.   icon_twisted
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seedlings
Posts: 688


Chad B. KC, MO


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #210 on: February 13, 2012, 03:43:37 PM »

This project and it's threadspawn rule!

 icon_smile icon_twisted

CHAD
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WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #211 on: February 13, 2012, 04:41:18 PM »

Cool to watch it evolve.  Wink

More Tone Control Mods.   icon_twisted

http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1
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mr_deadmaxxx
Posts: 150


Don - Phil.


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #212 on: February 15, 2012, 09:02:40 AM »

Is this better than the dr. boogie?

Pretty simple schematic and no more trimmers for biasing.
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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #213 on: February 15, 2012, 09:18:14 AM »

imo ...more versatile Wink

and yes, no bloody trimmers..yay!... Grin
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mr_deadmaxxx
Posts: 150


Don - Phil.


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #214 on: February 15, 2012, 09:32:06 AM »

so your spitfire V3 is better build than the original spitfire? schematic changed?  icon_rolleyes

thanks..
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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #215 on: February 15, 2012, 09:36:23 AM »

yes, less switches etc...more to the point!..

but people are suggesting mods  all the time too.... Wink
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mr_deadmaxxx
Posts: 150


Don - Phil.


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #216 on: February 15, 2012, 09:38:51 AM »

Can I please ask what are the changes in the original schematic to get the V3? I want to get that V3 sound on your Youtube video..

Thanks..
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deadastronaut
Posts: 9540


Rob H. LONDON


WWW
Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #217 on: February 15, 2012, 09:45:04 AM »

here ya go, v3 pdf's.. Wink  rock on...... icon_twisted

http://www.diystompboxes.com/smfforum/index.php?topic=94608.msg826603#msg826603
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mr_deadmaxxx
Posts: 150


Don - Phil.


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #218 on: February 15, 2012, 09:51:49 AM »

oops! Shocked  Grin BTW, I assume this doesn't have the noise/hiss issue like the Dr. Boogie?

Thanks..

I wish I could have all that guitar skills you have on your demo videos.. Grin
« Last Edit: February 15, 2012, 10:45:07 AM by mr_deadmaxxx » Logged
WGTP
Posts: 2458


Re: 'SPITFIRE' Metal 'n' Blues Pedal...
« Reply #219 on: February 15, 2012, 12:18:17 PM »

Can't say for sure about the noise since some is due to construction, but just looking at Dr. Boogie again and with all those resistors and gain stages the Spitfire is surely quieter and easier to build.  The basic design has been around awhile and is used in some of the most popular DIY boost overdrive/distortions.  

Check this out for some theory and Mu mod to SRPP for more gain.  Look for 7.7.01 article.  Wink

http://www.geofex.com/

SRPP mod (for more gain and lower output impedance) and Hiss Reduction, if needed.   icon_twisted  

http://www.aronnelson.com/gallery/main.php/v/WGTP/Spitfire-BSIAB+mod.jpg.html?g2_imageViewsIndex=1

Whoops, did I already suggest trying it at 18 volts with 2 - 9volt batteries.  No need to rebias.   icon_twisted
« Last Edit: February 15, 2012, 01:50:58 PM by WGTP » Logged

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