SPTWPJP Flying Spaghetti Monster Fuzz




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Published on Mar 2, 2014

here ya go, the flying spaghetti monster fuzz. took the front end of my stupid simple overdrive, added a big muff style tone stack with a midrange cut/boost as well, and hacked a germanium pnp transistor into the feedback loop of a simple opamp for some very sweet old school tones from clean to fuzz to synthy to crunchy to pure mud on up to scream... and then it's clipped again by germanium diodes on the arse end, so it's got the sweet tone of the overdriven ne5534 and is further sweetened by some good old fashioned germanium fuzzy goodness. i likes it. hopes you do too. ;)


the schematic, before i renamed it


vero layout, may be errors, check against the schematic


ok, so i added another simple gain stage to it to give it some more balls. tried a bunch of crap on the breadboard,
and finally settled on this... for all intents, it's the final stage of a big muff... i used a 5088, but any npn should do.

i tried it without the input cap.. didn't work well. since caps in series divide, i figured using a 1u input on the extra stage would drop the overall output capacitance.. which i guess it did. made for a bit tighter tone.

tried a couple resistor values for the resistor on the input, 15k seemed to work best, so went with it.
for the voltage divider i actually used 430k top and 105k bottom just cuz the odd value was convenient.
went with a 2.2k e resistor, cuz it seemed to have the best gain and tone for the rest of the circuit... below 2.2k, it was too grainy, above, started to get kinda muddy to my ear.

it was now loud as hell, so i added a 10k resistor before the output cap.. this seemed to also focus the tone a little more. also added a little filtering. i figured since i didn't wanna change the tone coming out, i'd go with the same size cap as the input... seemed to work well, so .1u it was, seemed good. added a 4.7m to ground at the end of the output cap cuz this is on a daughterboard and i don't want "pops". seemed to do the trick. may be overkill.

also added a second 100u filter cap for the extra stage... i figured that would help with noise, and also decouple the two stages from the power supply.. nice, quiet, and solid.

on batteries, it is now really cool and squishy on dieing batts... and real tite and focused on a wart at a higher voltage. i won't be happy til i gig it next week, but im happy with the tone and response... it still cleans up nice, but doesn't need as much gain to get a good solid classic rock guitar tone.... i find the gain about 10:00 is PLENTY... above that it becomes a distortion and eventually a somewhat gated fuzz/buzztone. should be plenty of gain for even weak pickups now. tried it with my maple neck black strat and my blonde 335 copy both... could get virtually the same tones with either guitar, and now unity gain is maybe 9:00 instead of 2 pm.

anyways... simple little stage. just add it on between the output of the board, and the input of the volume control. it's not necessary, but i found it better to have way more firepower than you need and a volume control than not quite enough balls to cut thru the mix.

i want people's @#$%in' hair to part at the back of the hall when i kick this puppy on. i think that won't be an issue anymore. ;)

heres a pcb/schematic of the add on:


here's a vero add on board:


so if you're messing with this, ya may wanna consider adding on this to the project. i didn't think it was gonna be necessary, and if this is the only pedal you're using it's probably fine... but this way it has enough drive to kick some ass instead of making ya wish it had enough jam.

anyways... onwards and upwards, peeps... peace out


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