Welcome to new section. Since t.org shows at least few projects based on good-ol Fuzz Face I decided to keep them all in one room. This is also good time to look at them again – correcting possible errors and update with new info.
Firstly – let’s look at Dunlop EJ-F1 Eric Johnson Fuzz Face. Attached project is based on 0,1″ pitch perfboard layout done at one point by Electric Warrior, with specific components added to match EJ-F1 spec, full off-board wiring as usual, no shielded wire, just like in real one.
So what we have here is basically standard Fuzz Face spec, originally Q2 resistor is paired with trimmer to set quite cold bias at 3v range. I decided to do it as an fixed bias for layout simplify and vintage look of sake of it. Just set the bias with potentiometer, pick the closest value resistor from your stash and solder it in.
What we also see here is small value capacitors between transistors Collector and Base. In traced unit at Freestompboxes there is only Q2 limiting cap, SMD type, no marking visible, but it shouldn’t be big. Our B.man have one coming soon, so as soon as we get the correct info, let’s say it’s about 39pF. For Q1 there is no cap, but there is a place for one, perhaps in later issues, when/if/in case if Dunlop will use hotter transistors for Q1 this cap will be there, at this point with recommended transistor pair omit the fucker.
Lastly, we have small value 27R resistor in line with 15uF cap to prevent squealing and few shifts in component values making this unit unique. Give it a try!
And here is the same as abowe, but for .15″ pitch retro-style vero. Will fit into hammond 125B enclosure, nice and old-school
Another Dunlop Fuzz Face variant – Joe Bonamassa Signature Fuzz Face.
As my previous layout, this perfboard is based on Electric Warrior’s work with just few components added to match it to JBF-3 spec.
What’s the Fuzz is All About? Firstly, it has one more component to (AFAIK) prevent squealing at higher Fuzz settings.
Secondly, it’s PNP germanium circuit. Old stock Russian transistors ware used.
JBF-3 was short lived limited to 300 units only. It’s gone by now, so here’s your chance to build one.
I did another layout with external bipolar power supply, but I wasn’t sure connections, so I decide to let you see it as is – bare bone.
Get your PDF project file here (project revision 2 – final error corrected)
Another project is is made for 0,15″ pitch veroboard. It’s classic Dallas Arbiter silicon BC183L Fuzz Face. First Si transistor issue. Wide space vero I did is still small enough to be fit into Hammond B style enclosure. No mods, no fucking around, just a plain and simple silicon Fuzz Face we all love, and hate…
John Hollis RockFace
Here’s description from John Hollis website
What we see here is slightly twicked (to JBF3 spec) Fuzz Face circuit with Q2 collector autobias. How cool is that?
– Draw designed to accommodate C-E-B short leg transistors as I have quite large stash of old Russian Ge’s with that pinout. It shouldn’t be a problem since most ge’s are long legged, you can bend them as you wish…
– It’s not exact RockFace schematic take. 100n in John’s is 10n in my layout, 47uF cap from mid lug fuzz pot to V+ is standard 22uF in mine. I’ve added 10R anti-squeal resistor in line with that 22uF, as known in Dunlop JHF3 Fuzz Face. Pot values are also taken from new-ish Dunlop FF’s
– Triple checked – not verified
Small enough to be fit into B sized Hammond enclosure, I’ve draw it with 0,1″ pitch stripboard in mind
More variants coming soon…