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Author Topic: X FUZZ  (Read 163086 times)

deadastronaut

X FUZZ
« on: March 14, 2014, 06:51:37 AM »
i ended up tinkering with Gus's ASDF  a bit, and went for a more heavy type groove :icon_twisted:.......

cleans up nice too 8)

i used a pregain as i just prefer the control of that...

cheers for the inspiration gus....lots of tweaking fun to be had.


https://www.youtube.com/watch?v=kaBkdysrX_A&feature=youtu.be





well worth breadboarding..if only to annoy your neighbours.  :icon_twisted:

edit:

vero layout...something for the weekend.. ;)



oops left off the 100uf cap...like i say breadboard it first... ;)
« Last Edit: March 14, 2014, 10:05:09 AM by deadastronaut »
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digi2t

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Re: X FUZZ
« Reply #1 on: March 14, 2014, 07:03:10 AM »
In a word.....


YEOWSA!!!!!

 :icon_twisted:
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haveyouseenhim

Re: X FUZZ
« Reply #2 on: March 14, 2014, 07:25:13 AM »
Awesome sounding :icon_cool:. And the schematic seems simple enough to help build my layout skills.
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jdub

Re: X FUZZ
« Reply #3 on: March 14, 2014, 09:02:28 AM »
 :icon_eek: Whoa!  That's a whole lotta sound for such a teeny circuit...very nice!
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kingswayguitar

Re: X FUZZ
« Reply #4 on: March 14, 2014, 11:08:26 AM »
rippin'
presently for some reason my browser isn't showing your images so no schematic for me, but the youtube vid was dope! a bit of delay at the end? nice touch!!
i'll check back later...
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deadastronaut

Re: X FUZZ
« Reply #5 on: March 14, 2014, 11:13:39 AM »
cheers,  i think my dropbox is messng around today... ::)
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rutabaga bob

Re: X FUZZ
« Reply #6 on: March 14, 2014, 12:59:31 PM »
Mmmmm!  Nice n' nazty fuzz!     Where's my soldering iron?!
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deadastronaut

Re: X FUZZ
« Reply #7 on: March 14, 2014, 01:06:47 PM »
breadboard...breadboard...breadboard.... ;)
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rutabaga bob

Re: X FUZZ
« Reply #8 on: March 14, 2014, 01:46:06 PM »
I...still...don't have one...   :icon_redface:
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deadastronaut

Re: X FUZZ
« Reply #9 on: March 14, 2014, 02:29:57 PM »
what!!!!!.. get down the shops man! ;D
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kingswayguitar

Re: X FUZZ
« Reply #10 on: March 14, 2014, 02:35:17 PM »
thanks for the image update. nice silicon cascade.
Peace
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digi2t

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Re: X FUZZ
« Reply #11 on: March 14, 2014, 09:40:51 PM »
Looks a bit like a modified front half of the BMP.

I've been testing several BMP versions on the breadboard for a month now, so I'm seeing it everywhere.  :icon_mrgreen:
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rutabaga bob

Re: X FUZZ
« Reply #12 on: March 14, 2014, 10:10:15 PM »
Hey Rob...
  What's the bold '10k' under lug 2 of the pregain pot?  There's no 10k shown there on the schematic.
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Gus

Re: X FUZZ
« Reply #13 on: March 14, 2014, 10:21:20 PM »
The circuit is different in two basic ways.

The ASDF has a gain control that adjusts both gain stages with one control.  The opamp base Blues Breaker and other effects have this control the ASDF is done with two inverting C to B feedback stages.

The ASDF has the base to ground resistor that does not need as much transistor selection as the circuit without the base to ground resistor (text book circuit, BMP type, some whas first gain stage etc.)

The ASDF also has a series resistor in in the diodes cap feedback path

There was this thread from the past
http://www.diystompboxes.com/smfforum/index.php?topic=92997.0

There are few ways to use two transistor gain stages for a overdrive, fuzz

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DDD

Re: X FUZZ
« Reply #14 on: March 15, 2014, 05:35:17 AM »
Very interesting sound and wonderfully simple circuitry.
Respect!
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Gus

Re: X FUZZ
« Reply #15 on: March 15, 2014, 09:49:59 AM »
I guessed at the guitar and cable cap part and used two diodes for one LED


Are the collector voltages close?

You have two gain stages set at max gain, no added series resistor from collector to base stage one to stage two. the collectors are closer to ground for higher gain. Stage one base goes to the input wiper without any added series resistance.
 
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deadastronaut

Re: X FUZZ
« Reply #16 on: March 15, 2014, 01:54:05 PM »
hi gus, cheers

i'll take some readings later ok...i'm using 5088's

was messing with adding that 33k back in last night ..still tinkering.


@larry: the 10k is from 9v to collector. ;)

don't build yet...breadboard it..
« Last Edit: March 15, 2014, 02:05:44 PM by deadastronaut »
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rutabaga bob

Re: X FUZZ
« Reply #17 on: March 15, 2014, 05:42:30 PM »
@Rob:
  I saw the labeled resistor...I was just wondering if there's supposed to be something at that spot that's not on the schematic...don't mean to be obtuse.
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deadastronaut

Re: X FUZZ
« Reply #18 on: March 15, 2014, 05:49:50 PM »
 ;D ahhh i see, ignore that..that was when i had a standing 10k instead...

no worries.. ;)
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cctsim

Re: X FUZZ
« Reply #19 on: March 15, 2014, 07:15:34 PM »
Are D1 and D3 needed ? It looks that the Q2 will start clipping the negative wave much earlier.
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