X FUZZ

[deadastronaut]

I think,the pot is forming a filter with your C2 which is why it is rolling off some high end.

yeah that makes sense now i look at it... (i'll take a look at that BMP with contour too, cheers bryan.

@prr: oops yes...i shall remedy. 

[deadastronaut]

ok, i give in  , i put the 1M gain pot across the collector and base of Q1...which works , and now it doesn't change the tone etc...great

however there is DC on it as its scratchy as hell...

@gus: added v for ya!..

[Brymus]

Now you need R1 again ,since you moved the pre gain pot.

[deadastronaut]

oops oh yes...

i tried a recovery stage on it today too, much better, (lifted from the big muff ( at least that came in useful lol. .)

sounds cool still...

[samhay]

As promised, I have this on the breadboard.

I think the LEDs should be oriented with cathode towards base. Once I figured this out, it wasn't noticeably gated and worked ok with the volume rolled back.

It is savage at max gain, but mostly in a good way. I added a base resistor to Q1 to tame it a little and make it play nice with others. It was squealing pretty badly on the breadboard without a buffer in front, so a small cap to ground here might help too.
I tried the 'Blues Breaker' style gain control with lug 3 of the gain pot connected to C4. At max gain, this is equivalent to how its drawn at the moment, but it lets you back the gain off a little easier.
You certainly need to roll of some fizz, and the SWTC does this nicely.

[PRR]

> there is DC on it as its scratchy as hell

On what? The Gain pot?

The way you have it on #61, the "gain" really does violence to the DC conditions. (Meter the collector while you diddle "gain".) I suspect the C-B resistor should be fixed, and an input level pot put before the input capacitor (you may have done this before?). There's other ways but more complex.

[deadastronaut]

@sam: ahh cool, you have it on bread too...

yep cathodes/anodes ...i'll sort that,

the SWTC tames it a lot for the better for sure, non squeely...

is your gain pot scratchy?.... i'll meter mine in a bit.

''violence to the DC conditions''    i'll check for violence too..

edit:

@paul: whilst diddling the gain pot i get...0.63-2.54v..

edit:
sam, i put my gain pot the same as yours now, but still scratchy...

[DDD]

Is the gain pot actually necessary here?
Guitar volume pot does srtrictly the same without any scratchy sounds and without extra components IMHO.

[deadastronaut]

@DDD:  its a nice option to have it just for slight breakup in an amp really....

[Will.mendil]

Since I started on solid stat amps I need really use the volume pot on my guitar which might be a shame but really preference the pedal to self contained. I only use the volume on the guitar to kill the humms and feedback a when I am not playing.

[deadastronaut]

one other issue i found is the volume on guitar when lowered also rolls of the hi tone too (  on single coil neck pup)

the bridge hum pup fairs much better...

[Will.mendil]

I d like to go back to the x fuzz. I ve bread boarded it making sure it was exactly what you did and I don't get at all the sound you have on your YouTube video. What set up did you use? Do you have any further information ? Has anyone tested it ?

[Will.mendil]

I like the rock but I love your fuzz

[deadastronaut]

the schemo on page 1 is what i used for the vid,,

i used yellow 5mm leds if that makes a difference.

try taking the 220k to base ...

[Will.mendil]

obviously it had to be the only colour I cannot find .
What do you mean taking the 20K to base?

[Will.mendil]

I can only find 3mm yellow, they are 1.841V, what are yours?

[deadastronaut]

try taking R5 220k to base of Q2 . instead of collector..(page 1 schemo)

not sure of 5mm yellow voltages...2.4v maybe..

[Will.mendil]

That's what I understood, but R5 is already on base, and collector, putting both legs of R5 to base do you mean?
I know that the yellow's voltage are between the green and red, and i tried both but it only does the x rock sound.
Has anyone else managed to get the same sound? I'm pretty clueless there :s

[deadastronaut]

i mean take the 220k to base, and not to collector..

ok, give me a minute and i'll adjust my breadboard to the x fuzz and test again ok...



back in a bit..

[Will.mendil]

is that what you mean? i am confuse.

thanks though