X FUZZ

[deadastronaut]

i ended up tinkering with Gus's ASDF  a bit, and went for a more heavy type groove .......

cleans up nice too

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.  

edit:

vero layout...something for the weekend..



oops left off the 100uf cap...like i say breadboard it first...

[digi2t]

In a word.....


YEOWSA!!!!!

[haveyouseenhim]

Awesome sounding . And the schematic seems simple enough to help build my layout skills.

[jdub]

  Whoa!  That's a whole lotta sound for such a teeny circuit...very nice!

[kingswayguitar]

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...

[deadastronaut]

cheers,  i think my dropbox is messng around today...

[rutabaga bob]

Mmmmm!  Nice n' nazty fuzz!     Where's my soldering iron?!

[deadastronaut]

breadboard...breadboard...breadboard....

[rutabaga bob]

I...still...don't have one...   

[deadastronaut]

what!!!!!.. get down the shops man!

[kingswayguitar]

thanks for the image update. nice silicon cascade.
Peace

[digi2t]

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. 

[rutabaga bob]

Hey Rob...
  What's the bold '10k' under lug 2 of the pregain pot?  There's no 10k shown there on the schematic.

[Gus]

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

[DDD]

Very interesting sound and wonderfully simple circuitry.
Respect!

[Gus]

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.

[deadastronaut]

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..

[rutabaga bob]

@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.

[deadastronaut]

  ahhh i see, ignore that..that was when i had a standing 10k instead...

no worries..

[cctsim]

Are D1 and D3 needed ? It looks that the Q2 will start clipping the negative wave much earlier.