GGG Boutique Fuzzface Questions

[Easywider]

Just had some questions before I start building . Using a matched set of transistors , PNP , Positive ground layout ,  with the resistor values provided . R2 , 3 , 4 & 5 on the layout ,  would be the resistor values provided by Steve , correct ?
So I would be adding the 1 Meg resistors to R1 & 11 , Right ? Also , Would I even need the 10K trimpot in there , since the transistors are matched ? 

http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=101&Itemid=26#boutique

Thanks ,

Chris

[Easywider]

Also , Wanted to wire this up using no D/C jack , 3pdt(like in the layout) , with an LED . Where would the extra D/C jack wires go , I've gained lots of knowledge here & have my own views , but don't want to get embarresed  , just want to make sure i'am doing it right from the get go .

Thanks ,

Chris

[Barcode80]

to wire with no dc jack, just solder the black lead of the battery to the -9v pad on the board, and the ground to the ring of your stereo input jack. you still need trimpots to bias. matched Ge pairs are matched for Hfe and Leakage, that doesn't mean they will both bias the same.

[Easywider]

Patrick , Thanks for the info , More clear to Me now as to whats going on with the Fuzzface circuit ! Would biasing the transistors make for a better sounding Fuzzface , other than using a set matched transistors for HFE & leakage ? Using Ceremet trimpots from Steve , never worked with trimpots before , any certain way the pot should be soldered in as to the GGG layout . Should any adjustment be made to the pot before I try it out ?

[Barcode80]

biasing is necessary for the circuit to work! basically, you are trying to relate apples and oranges. Hfe and leakage matching is to make for better tone and more consistent performance. biasing is using resistors (or in this case, a variable resistor) to set the collector voltage of the transistor to roughly half the supply voltage. this is generally where the circuit performs best, though just tune it by ear. the inconsistencies in germanium transistor manufacturing cause wide variations in the behavior of the devices, so not all transistors will need the same amount of resistance on the collector to make the collector voltage ~4.5 volts, this is why often biasing with devices like Ge transistors and j201 fets (horribly inconsistent) is usually done with a trimpot, to keep from having to swap a ton of resistors in and out to find the right resistance

[Easywider]

I see , understanding even more now , Thanks ! ....... is there any special way as to solder the trimpot to the board , & is there any adjusting to the pot before You try out the circuit ! Also , should i use the resistor values that Steve provides , or the values on the GGG layout for best performance in this circuit !

[Easywider]

Just bumping this one up , still need help on my previous post , Thanks ,

Chris

[Barcode80]

i would use steve's, as he tests those resistors values in the circuit when matching the transistors.

you solder a trimpot just like you would anything else

really, you can adjust before you actually plug in, but you have to have voltage on. if you take voltage at the collector of each transistor and turn the trimpot until it reaches 4.5, that will give you a good starting point. then you should probably go ahead and plug in the circuit, strum guitar through it, and adjust if need be to your liking.

[Easywider]

Thanks & Just had another Two Questions . Using the PNP positive ground layout with 3pdt & LED indicator : http://ggg.anomielife.com/index.php?option=com_content&task=view&id=101&Itemid=26#boutique ,

to wire with no dc jack, just solder the black lead of the battery to the -9v pad on the board, and the ground to the ring of your stereo input jack. you still need trimpots to bias. matched Ge pairs are matched for Hfe and Leakage, that doesn't mean they will both bias the same.

When looking at the layout as its facing You , was wondering what pad is the -9v , using a GGG board , is it the 4th or 5th pad from the right side of the board (right above R2 , or to its left ) , or could i use either pad ? Also , trimpot i'am using is from Smallbear , has 3 legs , believe the wipers in the middle ?....how can i make sure its soldered in right , used the first two pads from the right as its seen in the layout ,  (R9) & the one just below it thats not highlighted in red just underneath the middle . does the pot have to go in a certain way , could it be in backwards ? Hope I didn't confuse .

Thanks ,

Chris

[Easywider]

Just bumping this up , Need help from someone badly !

Thanks ,

Chris

[snoof]

doesnt matter which pas, they are both connected and are electricaly the same.  look up the data sheet for the tranny that you are using, that will tell the pinout.  use tranny sockets so you can swap trannys around in the crkt w/out resoldering.

[Easywider]

Thanks for the reply Scott , Used tranny sockets , think i'am going to roll with the trimpot the way I have it in now . Wish someone can help Me on the questions I have about it , think its in right , we'll see . Time to start wiring !

Chris

[snoof]

the trimpot will function either way as long as the wiper(middle lug) is hooked up properly.