feneder wrote:This is the schematic ive found
http://www.muzique.com/lab/tbypass.htm
I migth try it that wat though and see if i like it. Also, i was wondering if i could use a pot instead of an spdt switch. That way i could blend the signal between the tone stack and the bypass. Kind of a compromise between the std Muff sound (which i like) and the mids needed to be heard. Could i damage the circuit by sending only a portion of the signal through the tone stack, and the other portion in the bypass
That will work certainly, you just need to identify the 10n cap and 22k resistor and lift their connections to ground: You can then connect wires from the disconnected ends of the cap and resistor to one lug of a SPST switch, and wire the other lug to ground (maybe one of the now-empty ground pads). When the switch is closed, the cap and resistor are both grounded and the stack works normally: When the switch is open, the ground connection to those components is broken and the tonestack is effectively bypassed.
If you want to
blend mids back with a pot, there are far better ways than creating a bypass path: Search for "big muff mids" and you'll find many different solutions. My favourite is one used by the Earthquaker Hoof fuzz (YABMP): They actually took it from AMZ -
http://www.muzique.com/lab/tone3.htm
It requires you to replace smaller cap (3900pf in the AMZ bypasss chematic) with a 22n cap (or 0.012uF in the AMZ schem in the last link), and replace the 22k resistor to ground with a 3k3 AND a 20/25k pot to ground. You then get the stock midscoop at one end of the rotation, flat mids, and then slightly boosted mids at the other extreme.
I have to warn you, that messing with the tonestack of a BMP can place you at serious risk of developing a pedal modding/building addiction.... The BMP is a very versatile circuit, and you could spend a
lot of time messing with values and tinkering with the sound of the tonestack alone, the Duncan tonestack calculator below allows you to change the values of the caps, resistor and pot and see the effect it has on the sweep so you can tinker to your heart's content:
http://www.duncanamps.com/tsc/
You cannot
damage a pedal by rewiring it: Please note that this is not the same as saying tinkering with it will not stop it working. If it stops working, you've wired something wrong and will have to find the fault and fix it....
In my own personal experience and opinion, modding commercial pedals can actually be trickier than building one from scratch. The traces on manufactured pedals are often rather thin and can be difficult to unsolder/resolder without damage. If you like the idea of modding a BMP, I'd suggest considering medium/long-term getting a breadboard, laying out your favourite BMP schematic and then just messing around with all of the sections: Try different coupling caps, different clipping options, add extra pots, switches etc, to find your favourite sound. You can then get a standard BMP pcb and solder your own custom personalised BMP, or maybe even make your own veroboard/perfboard or home etch a pcb yourself.
nocentelli