Building a Bazz Fuss fuzz pedal

Hey, what should we do today? How about making a fuzz pedal?

Cool, I knew you were up for it.

As you may be aware, I’ve recently been helping my friend Adam with a few guitar projects and he was keen to get started on pedal making (specifically a fuzz pedal). I suggested the Bazz Fuss as an easy starter project. It’s only 5 components (and a pot) and it sounds good too. It's designed primarily for a bass guitar, but it sounds great with a normal guitar too.

Here it is (note that I laid mine out slightly differently, and I eventually swapped the 10k resistor for a 100k one):

[from http://diyyoguitare.hautetfort.com/archive/2010/07/13/bazz-fuss.html]

Since I hadn’t already made a Bazz Fuss myself, I decided it might be fun to do so. Apart from having one for myself, it would be handy to have one to refer to if Adam ran into any issues while he made his.

I decided to challenge myself a bit and see if I could fit it into a Hammond 1590A enclosure. They’re pretty hard to find round these parts, but I did manage to find one that had almost the same dimensions. In fact it’s slightly tighter than a 1590A, but hey, that’s just part of the fun, amirite?

Just for reference, a Hammond 1590A enclosure measures 93 mm x 39 mm x 27 mm. Mine measures 90 mm x 36 mm x 30 mm. The walls are a bit thicker and there are some extra bits inside which will make it even more cramped.

Here’s the enclosure in question: 

And here’s the inside. You can see some additional metal in there that you would ordinarily screw a ground screw into, as well as some circuit board slots (which I won’t be using).

Here’s a bit of a test fitting just to see if I can even get the main mechanical parts in there:

The answer is “just about”. So we start drilling very carefully.

First the switch:

Then the first jack:

 

Second jack in place:

I’m testing the jacks with something plugged in, just to make sure I can still do that without any contacts banging up against anything they shouldn’t. In a normal-sized enclosure this would be less of an issue, but things are very close together in here.

Next to go in is the DC-in jack, since there’s really not much flexibility there. Once that’s done we’ll be able to see what space is left for the pot and the circuit.

OK, the pot can just about fit in here, with the legs bent up (in fact I ended up cutting off parts of the legs to help them fit).

Just one more item and that’s the LED. I decided to go with a smaller 3 mm LED. And I also decided to make use of one of the little grounding threaded holes I mentioned earlier. 

This (little) one, which I drill all the way through so the LED can sit in it:

Here’s how that looks from the front:

And we’re done (apart from the circuit and wiring of course):

Here’s how THAT looks from the outside:

When you’re trying to fit a circuit into something this small you really have to think about how big your circuit board can be and still physically fit. Not only that, but things like whether the capacitors can sit vertically without hitting the back of the enclosure (they couldn’t, which is why they’re lying flat).

Anyway here’s the board done, and wired to the pot:

I stick some insulating material between the pot and the board so there are no short-circuits:

Before we wire this up, I’m going to paint the enclosure. How about blue?

And here it is wired up. Not the easiest pedal wiring job I’ve ever done.

I’ve put some insulating tape anywhere where there was a danger that something might touch something it shouldn’t, and that included the inside of the back cover.

 

Finally it’s time to put it together.

The first time I tried it out, it sounded bad. It worked, but not well. I replaced the 10k resistor with a 100k one and it sounds great now. You may want to do the same.