Dirtbag with 4xMN3008 (MN3005 fakes from smallbear)

[RonaldB]

Hi,
After building the dirtbag with the V3205 chips I wasn't really happy with the sound.
So I purchased the MN3005 fakes from smallbear (2 sets). I made a little prefboard layout and changed the circuit to the MN3005 standard. Now the echo is beautifull.
What I did changed was for R11 and R12 39K instead of 68K. Somhow I liked it better with those values.

And after reading this post last night:
http://www.madbeanpedals.com/forum/index.php?topic=5090.0
I added a 100R resistor after C32. I will be trying a 1K potentiometer in the future.


Looks haven't changed, sound Oh yes. THANKS MADBEAN.

[njkke]

Can you tell me more about your mods? I've built a dirtbag with MN3205 that works one day at week! Probably the MN3205 from Hong Kong are instable in some way I don't know... I'd like to switch it to a MN3008 version, simplier to find in europe...

[RonaldB]

I used the schematic Small bear added in his shop:
http://www.smallbearelec.com/servlet/Detail?no=247

And followed Madbean documentation to redo all the changes made for the V3205 version.

I'm also in europe (the Netherlands) to be exact. But ordering from Small Bear was easy and cheap.
Got them send in a week for 33 euro's.

best of luck
RonaldB

[gtr2]

Nice build.

Gut pics are required 

Josh

[the3secondrule]

What I did changed was for R11 and R12 39K instead of 68K. Somhow I liked it better with those values.

What effect did/would this have?

cheers,

J

[RonaldB]

They will follow 
But because of the prefboard there is lots of spagetti in there (16 wires)

RonaldB

[madbean]

What I did changed was for R11 and R12 39K instead of 68K. Somhow I liked it better with those values.

What effect did/would this have?

cheers,

J

It reduces the output of the compressor portion of the compander. IIRC, 39k is the value used on the Memory Boy which uses 4x BL3208a.

[LaceSensor]

They will follow 
But because of the prefboard there is lots of spagetti in there (16 wires)

RonaldB

please consider to post your doubledelay board layouts ? thanks

[RonaldB]

Lacesensor:
I will draw one up tommorow. I did this one out of the top of my head.

Madbean:
I Think the 68K would work also but i'm happy with the 39K for now.
Will the dirtbag delay PCB's be stocked again soon?

RonaldB

[sgmezei]

I would consider putting in a bypass switch. That way it isn't always on......

[RonaldB]

i have all my effects routed through a bypass looper, no need for a switch in pedals then.

[RonaldB]

Here is the pref layout I would use the next time I will make these double delay boards.
Mine are a mess now but they work

[LaceSensor]

thanks

[pickdropper]

I think a layout that used PCB mount pin headers could clean up the wiring quite a lot.

After I finish up a few other things, I may make a go at it.

[EDIT] - Nevermind, I see that Smallbear has the PCB layout for this already on their site.

[LaceSensor]

HI

This also works (at least in an aqua puss build)

http://www.sabrotone.com/?p=698