So I was at band practice and we were writing a song about a giant robot and I found myself wishing I had a MXR Blue Box when all of a sudden I notice one in my guitar players pile of pedals he doesn't use. I plug it in and sure enough the volume drop makes the pedal almost useless. So I get to looking it up and I see the "C11 Mod". sounds easy enough. So I try that mod and it helps ever so slightly but definitely does not fix the problem. It did make the pedal a little brighter with a little more headroom. Over all a better sound. So I put the Blue Box in front of my behringer eq pedal (the cheap one), flattened the EQ raised the gain to gauge how much boost I really needed to make that pedal up to par. Turns out that it only needs about 3db. With that little bit of gain and the "C11 mod" it sounds great. Exactly what you expect out of the pedal without any disappointment. However I'm not gonna dedicate my EQ pedal to make one effect work during one song and have to adjust it. So I thought how about I build a small buffer at the output of the pedal and if it is to much I'll always be able to dial it back with the output knob of the pedal. Searching through buffer schematics on this site I found a great simple JFET guitar preamp. http://www.montagar.com/~patj/preamps.gif It claims to add exactly 3db! perfect! So I built the preamp with a few mods of my own. here is my schem.
and tested it side by side with my EQ to see if it gave me what I wanted. It does! Perfect! IT's small enough to fit in the battery compartment too! yay!
So here is where the problem comes in... I was gonna use the battery clip leads to provide power my preamp but there is no power to the clip when the pedal is plugged in to the wall. WTF? Is this because of an input switching jack or something? I assume that the battery is just run in parallel with power input so then why no voltage to the clip when the pedal is plugged in and on? and the pedal is on. I already checked that. I can't find a definitive schematic for this pedal. Every schematic I find is a sort of "this is good enough you can figure out the rest" sort of schematic. which doesn't help on this particular problem. Help?
Some more information about the build to finish up the post. I'm going to cut the middle lug of the output Pot so that part is still soldered to the board and the other half is still connected to the pot. the two new leads will respectively become the input and output of my preamp. The negative lead of my preamp will be soldered in to the old negative solder hole of the ye' ol' C11. I haven't tested this part yet but it seems right to me. If you spot any stupid mistakes in that line of thought be sure to point them out. Thanks guys!