The Stein Fuzz is a lightly modified version of the Roger Mayer Stone Fuzz* pedal (which is itself a lightly modified Fuzz Face). The main difference is more standardized part values (the pots mainly).
It's meant to be a positive ground circuit (center positive, so not daisy chain-able with standard center negative/negative ground effects), but looks like a good candidate to convert to negative ground. The perf side of the layout below reflects the positive ground orientation of parts, and the PCB side reflects negative ground.
Vol 2 is Out, right?
ReplyDeleteYep
ReplyDeleteI've been trying for hours to get a lot of these smaller pcbs to print on the same page.
ReplyDeleteEven with Illustrator, im forced to "trace" the image, which screws everything up.These images look like they are created by a "vectory" program.
Any ideas?I cant be the first one not wanting to waste a full page of photo paper for one small pcb :D
I use Inkscape to print out my pcbs.
DeleteAtherinas
ReplyDeleteput on a Word file and then print
I use Photoshop. Keep Them 300 dpi (like the original) and you'll be fine.
ReplyDeleteI normally make a little montage of a couple pcb files to fill out a 160x100mm copper board to make the most out of my materials.
so if a build the pcb the center will be negative?
ReplyDeleteYes. Though if you want center positive, just rotate any polarized components 180ยบ and use PNP transistors.
DeleteThe voltage on the collector of q2 is -6.5 on both my breadboard layout and the perf. The result is with any trim pot resistance of 42k or below it cuts out. On other ff circuits, the voltages at q1 collector is higher (-1.5 vs -.6) and much lower on q2 (-1.5 vs -6.5). Any ideas on how to have the bias work through its entire range and how to balance the voltages closer to a traditional ff?
ReplyDeleteCan you please verify the output cap value?
ReplyDeleteYes, output cap value looks too high. Is that supposed to be 0.1uF / 100nF. Or is the 100uF value correct?
ReplyDeleteIm going to assume its 100nF looking at the footprint. Ill report results. Cheers
DeleteJust a typo. 100nF is correct. (If it were 100uF, it'd be an electrolytic)
DeleteAwesome! Thanks.
DeleteI built a working one today with BC550C's and with the polarized components flipped. My trim pot worked for a wider range than SScotMcA's, but like him, I was also getting atypical Fuzz Face voltages. I experimented a bit on a breadboard first, and I ended up replacing the 10k resistor off the voltage rail (the left one in the layout) with a 1k8. After that, I was able to get pretty close to the GGG-recommended 1.4v and 4.5v for the Q1 and Q2 collectors, respectively.
ReplyDelete