A modified and improved Hornby Skewes silicon Zonk 2 that goes for big bucks.
Schematic and a breadboard session(!) is avaiable HERE.
It seems that silicon transistors in the 150-200 hFe range works best in this circuit.
*Update 240203* Reeves Electro got in touch with Gray Bench since two of the pot values was incorrect in the trace. Layout and schematic is updated.
Schematic
Tag it! Used PN2222's at 165 hfe and it sounds massive!
ReplyDeleteNotice some contrasting info from Markus in the comments about the swell and drift values. Haven't tried it yet, but like it the way it is.
ReplyDeleteBuilt it using <100 2n5135. I tried 2n2222a as well but found they were a little gated in this circuit. Thank you Anders!
ReplyDeleteGreat sounding fuzz. Thanks for the layout.
ReplyDeleteWorks nicely, but how much output are we getting out of this? I'd say it's probably only slightly above unity for me, using 2N2222As.
ReplyDeleteI used a 2n3906 for q1, hfe was 197 and 2n2222A for q2, hfe was 180. Not tried any other transistors yet as happy with this combination. Plenty loud and sounds great.
ReplyDelete2N3906 is PNP, a 2N3904 is the NPN equivalent but if it sounds ok then I guess leave it in
DeleteJust checked my board and I have the 2n3906 orientated the opposite way around to the layout. Guess I had a stray 2n3906 in my 2n3904 bag.
DeleteI've been LOVING this. Just wish there was a bit more output to it. Thoughts on boosting it a bit?
ReplyDeleteLower those 220k resistors on the output?
DeleteGreat layout, tried 2n5550, mpsa06 & bc337 all around 150 ish hfe, the Texture pot really makes this shine over the original
ReplyDeleteJust tried Fairchild BC547A 110-220 hfe, sounds great! A huge thanx for your well balanced layouts!!!
ReplyDeleteHello, thank you for this, would anybody be able to draw up a tagboard layout for this? real noob asking here. Thank you all
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ReplyDeleteOften times when this happens, the culprit is a tiny solder bridge or fleck of copper trace bridging on the underside where it shouldn't be. I keep a magnifying glass and exacto knife handy for board inspection no matter how many times I'v built a circuit. If you've used all the right value components and potentiometers and got them all in the right places (this is something I also triple check every time), then I would ask what transistors you used? These primitive fuzz circuits can sometimes be really finicky with transistor choice, which is why I always use sockets. Also, it is not the cheapest tool, but getting a Peak semiconductor tester (if you don't all ready have one) helps out a lot. I follow all this with the caveat that, sometimes, a stripboard build just doesn't work. MANY times, I've started over and had NO problems the second time, even when I wasn't able to diagnose the problem on a nonfunctioning build the first time. I'm, quite obviously, not a scientist. Good luck!
DeleteFixed the mistake, I should have removed the flux better. Thank you.
DeleteCongratulations! Seriously - getting something perfectly right the first time is great and all - but I personally am more proud when I f*ck something up, diagnose it, THEN fix it. Building circuits like this has been the single greatest lesson in patience that I have ever undertaken.
DeleteYou are damn right. I've been doing diy's fx for a while now and every time its struggle. But often I have success.
Deletesome of my diy's
Deletehttps://harlywake.blogspot.com/2024/05/diys-by-my-design.html
Nice work - the old school BMP-style enclosures look really great!
DeleteThanks a lot
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