Barber Electronics - Dirty Bomb [gut shots + schematic]  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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SPeter
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Post by SPeter »

Thanks for the link!
:applause:
:D

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Colca
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Post by Colca »

hello could someone do this pcb??? I am very interested in this pedal

greetings and thanks

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culturejam
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Post by culturejam »

Colca wrote:hello could someone do this pcb???
Knock yourself out. The schematic is good to go. :thumbsup

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Colca
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Post by Colca »

culturejam wrote:
=Colca wrote:hello could someone do this pcb???
Knock yourself out. The schematic is good to go. :thumbsup

if ok but since I am new to this the diy, I manage better with the pcb made by the eagle and not even make myself .. you can do it for me??

regards,

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Post by chi_boy »

Hi all;

First, thanks for the great effort. You guys that do these traces are amazing.

Second, I'm a user of the info provided here with no electronics background. Have mercy.

I want to do a layout for this one for myself and since I am using Eagle I need to complete the schematic to include the additional power supply components that aren't in the schematic on Page 1. I studied the pictures and tried to fill in the gaps. The one thing I haven't run into before is the second bias network. It looks like that is just there to keep the layout neat and doesn't look wrong, I just haven't seen it before. I also included opamp "B" to keep Eagle happy.

Could the pros take a look at the power supply section and see if it looks right?

Thanks!

George
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Dirty_Bomb.png
Dirty_Bomb.png (32.4 KiB) Viewed 3282 times

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Colca
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Post by Colca »

I have built with the schema.. that is in the first pages, and I must say that sounds pretty bad, the sound for a metal zone! :?

I think not, at all well the schematic.

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Post by chi_boy »

I have an unverified layout you can try if you are willing to be a test subject.

I can post here or email. I don't know if the Mods or Culturejam would have a preference.

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Colca
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Post by Colca »

chi_boy wrote:I have an unverified layout you can try if you are willing to be a test subject.

I can post here or email. I don't know if the Mods or Culturejam would have a preference.
Yes please, send !!!!!!

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culturejam
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Post by culturejam »

chi_boy wrote:I can post here or email. I don't know if the Mods or Culturejam would have a preference.
Always post it. The more eyes on it, the better. :thumbsup

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Post by chi_boy »

OK, as I said, this is unverified.

If anyone tries it, please post any findings.
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_dB
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Post by _dB »

Hi all,

I've been looking at a lot of hi-gain distortion circuits lately (Riot/uproar, Severe, Crunch Box and now the Dirty Bomb). These four pedals seem to be following more or less the same recipe with different clipping configurations, filtering caps and tone stacks.

I'm a bit stumped, however, by R5 in the Dirty Bomb schematic. That's the 100K resistor that's going across log 2 and 3 of the GAIN pot.

Could anyone help me shed some light on what it does? Does it affect the circuit's gain? It seems to me that the way it is placed it wouldn't factor in the gain but just end up in series with the opamp's output and in parallel with the "leftover" portion of the GAIN resistor which isn't part of the feedback loop. Am I understanding it correctly?

While I am at it, it would also be great if someone could clarify the purpose of the R1 / C2 pair for me.. Why such low values? It looks as if its creating a lowpass (with C2) for frequencies below ~3387K Hz? (using the amz filter calculator with 47pf and 1K).

Thanks for any help!
dB

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Post by rcustoms »

hey guys, I made my own version of the schema and pcb, and works very good,great sound, and all controls respond clearly, exect the switch. I do not find difference between the two posiciones. someone tried the circuit to verify this.if someone needs the eagle files send me a email at rzguitarshop@yahoo.com
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Post by rcustoms »

ok guys ,i re-check the switch, and was bad, now the pedal is complete and sound super distortion.i dont know how ,put pictures here,but remember send me a email.
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Post by hbo »

Someone asked me to do a vero layout for this effect. Thought I'd share it with all of you. Note that this is still not verified.

Image

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rcustoms
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Post by rcustoms »

la bomba
parts.pdf
parts
(52.52 KiB) Downloaded 564 times
schematics.pdf
schematics
(23.67 KiB) Downloaded 818 times
pcb.pdf
pcb
(21.52 KiB) Downloaded 571 times
:popcorn:
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Post by distortion_gfx1 »

rcustoms wrote:la bomba
parts.pdf
schematics.pdf
pcb.pdf
:popcorn:

Thanks a lot! :thumbsup

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Post by rasta_maleek »

chi_boy wrote:OK, as I said, this is unverified.

If anyone tries it, please post any findings.
all look to be correct, but, why two divisors for the bias supply?
r-customs use one for all the bias.

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Post by rasta_maleek »

rcustoms wrote:la bomba
parts.pdf
schematics.pdf
pcb.pdf
:popcorn:
a very lot of thanks r-custom for sharing.
have you got it with ground mask?
it will be great :applause:

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Post by rcustoms »

hi mr rasta_maleek ,i use only one divisor for bias supply and my pedal work amazing .here's what you need
regards
:D
pcb.pdf
la bomba
(29.86 KiB) Downloaded 436 times
http://www.rcustomspedals.blogspot.com
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Post by rasta_maleek »

rcustoms wrote:hi mr rasta_maleek ,i use only one divisor for bias supply and my pedal work amazing .here's what you need
regards
:D
pcb.pdf
thank you so much R-custom.
In a few days it will be made.
cheers

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