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These look quite cool, but not very pedal board friendly http://www.ebay.co.uk/itm/141336020781?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
I quite fancy putting one of his Supa Fuzz boards in - http://pigeonfx.com/kits.html - but don't have much experience with germanium trannies - would OC75's be a good bet? Or any recommendations for a different kit that might be better?
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Studio: https://www.voltperoctave.com
Music: https://www.euclideancircuits.com
Me: https://www.jamesrichmond.com
Football is rubbish.
Ah! AC107s, H! This forum keeps ripping me back to my teens!
Annoyingly, my boss when I was an apprtce' (horrible bloke!) served his time at Pye Electronics so we had bucketfulls of NKT transistors of all shapes and sizes. Had I had the presence of mind to just fill an OxO tin (remember those?) I would be well setup now!
A point comes to me. We were always warned to use a heat shunt when soldering such transistors. I do not bother at all with modern components but it must be worth the slight trouble if they are 30quid a pop!
All you need is small, snipe nosed pliers and a lakkyband.
http://www.maplin.co.uk/p/heat-shunt-fr10l
Well bugger me! Maplin's search engine actually found what I was looking for!
Dave.
Never built a fuzzbox but I would say the first 1meg bias resistor should go to -9V not +9/ground?
The last stage will presumably be signal biased?
Dave.
Apologies Dave if I've spotted the wrong one, but the 1M is part of the input filter and Q1 of a Tone Bender is indeed connected straight to the -9V rail.
@Gagaryn - two thing to watch out for, firstly if you can check an accurate gain for Q1 then be careful not to make it too high a gain or biasing the rest of the circuit becomes an arse pain. The tranny can be pretty leaky but you really want something between 40 up to the very low 60s at most. Secondly and more obviously solder a pot (or try different size resistors - marking results) in place of Q3 before settling on the final value. I'm sure Pigeon will include it in the instructions but just in case you are looking for a reading around -6V (off 9V supply), not the half input voltage you might expect with a Fuzz Face.
Yes.
A transistor around 70 would be great for Q2. For Q3 go for something between 90 and 105 (preferably right in the middle, but no biggie). Whether you use OC75s or AC128s for any position really isn't going to make a vast amount of difference (if any audible) to your fuzz. The only repeatable audible difference I have noticed in various models of germanium transistors is that the zero leakage Russian type tend to have a tighter sound when used in fuzz, which isn't my preference but some people love.
I think you would be better (or by the sounds of it will need to) finding a lower gain tranny for Q1. You may just about get away with something in the mid 60s range. The good news is you are looking for one in quite in undesirable range so they will no doubt be abundant and should be cheap.