Mad Bean Pedals Dustbunny, Руководство пользователя

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Notes Dustbunny
madbeanpedals
• There are a variety of NPN silicon transistors that will work in this build. For mine I did the
following - Q1: BC108, Q2, Q3: BC207B (140hFE and 160hFE, resp.) You could use all
BC108/109 or find a cool mojo mix. Smallbear has plenty to offer for Tonebender types. Generally
smaller gain buckets are better (300 hFE and below).
• Each transistor has a multi-pin layout so if you have straight pin, triangle pin, CBE, EBC, variations
in your transistors they will mount easily. The middle row of three pads are for the base pins of the
transistors.
• C4 is optional. A small cap between collector and base of Q3 can shave off a little hiss or
excessive highs, if desired. Suggest you socket it or just insert the 47pF loose in the pads to see
if you like what it does. You can use higher or lower values - I find 47pF to be a good start without
removing too much high frequency.
• I’ve used 100n for C6 in previous Tonebender builders. It will add a little more bass. In this build I
stuck with 10n and liked the balance just fine.
• Set the bias of the Q3 collector using your multimeter by turning the trimmer until you read about
4.5v on the “TP” (test point) pad.
MODS
• This version can get very compressed at the highest fuzz setting. Personally, I like this a lot
because there is a very good range of less compressed fuzz tones on lower settings. However,
you can mitigate the compression somewhat by lowering the value of R7. The caveat is the lower
the value of R7 the more C4 starts to act like a (unwanted) filter. So, you may have to remove C4
in that case, or lower it to something like 10pF.
• C1 is probably a good place to start if you want have more high end or want the effect to be
brighter when rolling down the guitar knob. Smaller values will bring some highs back, but don’t go
too far: you might start to pick up radio or get unwanted noise!