![]() Now after reading plenty of articles about FF circuits I knew this, but I didn’t really understand what it meant. While tinkering with these two controls I happened upon a characteristic of germanium transistors. The trimmer will allow you to decide the start of this range of adjustment. The Bias knob allows you to swing that up to as much as -5.0v. The typical FF circuit is setup to have -4.5v (measured at point ‘T’ on the PCB). The Bias control is able to swing the bias on Q2 across an approximate range of 3 volts. It’s magical! Biasing and TemperatureĪs mentioned in the preamble, the fully featured PCB has a Bias control, and a trimmer. With the new ‘stmp’ board and SLW’s choice of potentiometer, this is all you have to then wire into the enclosure. NOTE: It’s hard to see from the above picture, but there are only 4 wires coming off this finished board signal in/out, 9V in and ground. The ill-fated gold enclosure next to the assembled Fuzz circuit Inkscape wasn’t working out as you cannot zero the ruler arbitrarily, which irritated me to no end. Adobe Illustrator was my software of choice. This meant not only did I have a perfect basis for my design itself, but I could design it over the spots for the holes that I would then use for a drilling guide. It was PDF form, and layed out accurate to the millimeter. I was able to designing something with much greater confidence this time as I started with a drilling guide supplied by DIY Effects. This is often the most stressful, but ultimately satisfying part. Geofex has a fantastic discussion on The Technology of the Fuzzface (including the Fuller Mods). This proved encouraging, so I ploughed on. As a nod toward what might be called the mediocre standard circuit, I did initially build a completely standard silicon fuzz. This was mostly because I hadn’t ever used a Fuzz-face before, so was eager to try it in all it’s ancient and modern glory. This means I must use positive ground when I wire everything up. A pair of germanium transistors can cost anywhere between $10 and $50 depending on how much you’re prepared to be fooled either way they’re orders of magnitude more expensive than their silicon counterparts. Standard silicon fuzz on the prototype boardĭespite all this superstition, which normally sends me running, I went for a pair of AC128 germanium transistors from Mammoth Electronics. The PCB is designed to fit neatly into a 125B sized enclosure. ![]() Of course if you want to use wires, you still can. And it gives you a very sturdy board support within the enclosure, so no need for dodgy nylon supports anymore. Again this significantly speeds up the assembly of the board. The DIY Effects fuzz PCB has holes setup so that you can use PCB style Alpha pots instead of the regular lug type.
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