Friday, January 22, 2016
NN Classic Fuzz
Happy #FuzzFriday everybody! Here's a circuit I found while browsing around the Free Information Society that's ripe for modification–the NN Classic Fuzz. I think I laid this out while I was on paternity leave a while back, but I just now got around to finalizing the layout. Anyway, I can't find any info on the circuit, other than the schematic on FIS. It runs off a +4.5v supply, so I added a basic voltage divider to lower the normal +9v supply voltage. Also, the schematic doesn't include any controls, so if you want to add a volume pot (start with 100k, and then adjust if need be), run a wire from the Out pad to lug 3 of the pot, lug 2 becomes the new output, and lug 1 goes to ground. Should fit nicely in a 1590a.
I tried to revisit this one after a failed attempt that passed no sound.
ReplyDeleteOn my second try, I took a cue from Small Bear's Fuzz E One and replaced the 10k resistor to ground in the voltage divider with two green LEDs in series. I got fuzz, but also unstable voltage on the 4.5v rail. When idle, the circuit made a "pap" noise like the motion tracker in "Aliens", but faster. I then pulled out the voltage divider completely and shoehorned a 5v regulator with twisted legs into the circuit. That stabilized the voltage and got rid of the motion tracker sound, but I had lots of idle noise. In both cases, the fuzz that came through sounded mean, but not particularly unique or noteworthy.
Someone might get this fuzz usable with some mods, but it is not worth the effort.