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Old 12-18-2010, 12:30 PM   #1
mizxou
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Pedal mod help

I'm doing a very simple mod on a pedal, the instructions are:

replace r4 with r5, throw out r4, and jump r5

i'm not positive what jump r5 means, does that mean i just run a wire from the 2 now free lugs of r5?

thanks
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Old 12-18-2010, 12:39 PM   #2
james4
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yep, youve got it

it means you remove r4 and r5
put r5 where r4 used to be
then put a wire between the solder pads where r5 used to be


what pedal are you modding, anyway?
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Old 12-18-2010, 12:43 PM   #3
mizxou
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SD tweak fuzz, thanks man, appreciate it
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Old 12-18-2010, 07:22 PM   #4
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what will this mod do? im new to modding pedals and looking for a simple one to start..
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Old 12-19-2010, 02:12 PM   #5
Griffin Effects
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Edited: I just saw on the schematic that there are two boards and both boards have R4 and R5. Didn't see that at first.

R4 - 470 ohm
R5 - 8K2

Raising the value of both should increase gain and output level of the second transistor.

So the mod raises R4 to 8K2 and jumpers R5. The AC collector load is the sum of the collector resistors and the gain of the second stage is determined by the ratio of the AC load in the collector to the AC load on the emitter.

So basically we went from 9K1 total collector resistance to 8K2 total resistance.

Lower output level and gain?

Last edited by Griffin Effects : 12-19-2010 at 02:38 PM.
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Old 12-23-2010, 04:27 PM   #6
mizxou
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dave - this mod increases the volume, very worth it if you have this pedal

griffin - thanks man somehow i ended up switching the resistors on the wrong board and couldnt figure out why it wasnt working then i saw your post and realized there are 2 r4 and r5 - i dont know what you mean about the ac collector load and stuff but it didnt lower the output it raised it significantly
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Old 12-23-2010, 05:30 PM   #7
Griffin Effects
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Quote:
Originally Posted by mizxou
dave - this mod increases the volume, very worth it if you have this pedal

griffin - thanks man somehow i ended up switching the resistors on the wrong board and couldnt figure out why it wasnt working then i saw your post and realized there are 2 r4 and r5 - i dont know what you mean about the ac collector load and stuff but it didnt lower the output it raised it significantly


Must have looked at it wrong.
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Old 12-26-2010, 05:27 AM   #8
mizxou
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ANOTHER QUESTION:

The tweak knob has 6 settings and each one gets more fuzzy but the last one starts to take on this wicked synth like sound and I would so love it if I could get that sound even more....like if there were a position 7 and 8....you know what I'm saying? anyone have any idea how I can do something like that?

(I would even be happy if I could find another pedal to go on top of it)

It's sort of like an octave fuzz but not quite, I'm gonna get one of those soon though because it's wicked
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Old 12-26-2010, 07:45 AM   #9
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that octave sound comes from very bad transistor biasing. the closer you bias it to cutoff, the more pronounced the octave effect will get (to a point) until the transistor barely conducts and you get a fizzy splatty sound that fades almost instantly as the note dies away. bias it any lower and the transistor stops conducting at all (hence the name 'cutoff' ).

this is where it becomes necessary to learn about electronics. following diagrams and written instructions only lets you do so much (or should i say, so little) before you become helpless.
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