X FUZZ

[seedlings]

What keeps the noise floor down on these XFuzz circuits?  With all that gain, they're dang quiet.

CHAD

[deadastronaut]

^ no idea on that...but yeah pretty damn good for hi gainers...massive volume out too...

@mario: mine are both around 300 hfe..5088's

[duck_arse]

mario - the bc548B or the bc549B will be just about right for hfe of 300. the bc54xC will be more like the 2n5089.

[deadastronaut]

to those that have built (boxed ) this



whats it like 'pop' on/off  wise?...just curious . i haven't built it myself yet 

[Mario44]

Just found 3 old BC109. Two of them have 300 and one has 350 hfe. Just put them in, they seem to be more noisy than 3904's, but still there is no synthy sound. Bias pot does its job and nothing else, no magic.
DA: To clarify the matter, which schematic did you use when you were recording demo?

[deadastronaut]

@mario this one...

try to get some 5088's they are always handy anyway,  your 3904 will be fine for Q3 though..

[WhiskeyMadeMeDoIt]

I have not boxed it yet but my test rig doesn't pop at all when I hit the stomp. I have a Beavis board kinda thing.  I'll let you know when I get it all finish if there are issues. 

Quick question does the x rock use red LEDs and the x fuzz use yellow?

[deadastronaut]

cheers whiskey,  thats good to know, my breadboard (truebypassed)  pops, hmmm...

yep red leds for xrock..

[WhiskeyMadeMeDoIt]

Rob I went back and changed the LEDs and noticed that it does have a pop. I apologize for the misinformation. I had my amp down low and didn't hear it. It's isn't a loop pop but it is there.

[Mario44]

DA: thanks!
I'm gonna test it soon 

[deadastronaut]

@whiskey:

hmmmm... whenever ive used 'tonepad wiring 5' for the 3pdt  ive never had a pop, ...

i take all grounds to input jack...


could you clip a 1M across your input jack just to test it...

[WhiskeyMadeMeDoIt]

I will do as soon as I get back home.  I left right after I posted. 

[deadastronaut]

okey dokey...

[WhiskeyMadeMeDoIt]

Ok so I went in and added the resistor and it did not help. When I took it out again I noticed no pop again. I had moved a few wires around changing the LEDs before and then again when I fiddled with the resistor.  I cranked the amp up to ear bleed levels and clicked it over and over. You can hear a faint pop, but at that level it still nothing serious.  So i had not noticed pop, changed led and them did notice it , added resistor and it got worse, took it out and it is back to not noticeable.  What I think is happening is just layout related.  I will be boxing it this weekend and will report back any troubles. 

[Mario44]

Just recived a bunch of 2N5088's from postman. HFE is about 435, pluged them into breadboard and the result is still the same, no synth.
Any ideas?

[deadastronaut]

you have the 10k from 9v going tp a 250k pot lug 3, then lug 2 to collector?..

leds light up?

[Mario44]

I have 470k trim pot there with 10k resistor, LED light nicely

[deadastronaut]

hmmm... 4.7nf - 10nf from pregain lug 2?..

[Mario44]

4,7nf
on both 4,7 and 10 had the same

[deadastronaut]

so the bias pot changes nothing at all??..weird.