Madbean Dirtbaby

[Alex]

Brian's PT2399 version of EHX Deluxe Memory Man.
You can find all details on his website:
http://www.madbeanpedals.com/projects/Dirtbaby/Dirtbaby2015.pdf
(2.2uF Caps are Non-Polarized Electrolytic)

Layout Verified!

As Jopn mentioned in the last post, the "Tails" version had some design's flaws to which Brian could not find a solution.
(This is a new version of Madbean's project. The resistor from Rate 3 has been changed to 22k, the one from D2 is now 33R and the 100K from TL062 pin 7 to VB has been removed)

[IvIark]

Awesome matey

[Heath]

Nice!

Have you built this yet?

I did an Ebay search for 2.2uF non-polarized caps and they're kind of pricey, even from China.  What do you think would be an acceptable substitute? My first (crappy) thought was 2 1uF box caps + a 200nF box cap in parallel.  Not sure if that would make a huge difference from an electrolytic cap, aside from being super-ugly.

[Alex]

I haven't built it yet cause i'm abroad at the moment, but I will as soon as I'm back.
If you are based in Uk I've found these:
http://www.ebay.co.uk/itm/X-10-pcs-2-2uF-100v-bi-polar-electrolytic-nichicon-capacitors-1st-class-/141212441931?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item20e0eadd4b

http://www.ebay.co.uk/itm/X-10-pcs-2-2uF-50v-bi-polar-electrolytic-Rubycon-capacitors-1st-class-post-/261415778076?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3cdd98371c

Any combination to reach that value should be ok.
Do you have any non-polar caps?

[rocket88]

Heath is like me, we're in the US. I'll check to see if I have any that are multilayer ceramics. I know I hsvr them up to 10uF. Also, I can't wait to build this either. I've been dreaming of a memory man for a long time, so this is awesome man.

Albru80, where are you at now?

[Kinski]

This is awesome! I wonder how close it sounds to the DMM.

[Alex]

I've been in the U.S. but I don't know anything about effects diy components availability over there (better than here for sure!).
I'm now in Italy, going to France next week and back in London (England) next year!
Brian said it sounds close to the DMM (as a PT2399 version could be) but there are no videos available yet.
Like everything else he designs, I bet it's good!

[rocket88]

Ahh I was going to say, if you were in the US near me I'd take you out for a beer. But, I do hsvr good news. If the 2.2uF do not need to be electrolytics, there are 2.2uF multilayer ceramics. I checked my stock when I got home, and I've got a bunch, and they should be cheap too.

[Muadzin]

Holy jumpin' Jesus, Batman, this is awesome!

About those 2.2uf caps, do they absolutely have to be non-polarized? Can't we just use polarized caps and if so, how would they have to be orientated? I suspect the top 2.2uf positive towards the top TL062. How about that 2nd one?

[Alex]

Thanks anyway Rocket! A beer is always welcome! I think the second 2.2u cap should have the negative side connected to Depth 2. But don't take my word for it! I think there must be a reason why Brian used non-polar caps. Unfortunately my theoretical side is quite poor.

[rocket88]

No problem man, let me know next time you're in/near NYC. And that goes for any of the guys here.

Btw, are we sure they're electorlytics? And I'm pretty sure no polarized electrolytics can be subbed with any non-polarized cap as long as it's the right value. If I'm right, I'd try the multilayer ceramics, cause they're teeny tiny, and that space looks like it could be a little tight.

[Alex]

In his file's B.O.M. it says 2.2uF NP Electrolytic but I think any of the same value would be ok.
I didn't leave much space for them on the board because I have some non-polar at home and I wanted the board to fit in a BB box.

[Sergio]

What about 2 4.7 uf electros facing positive each other? That would make almost 2.2  uf  would this work?

[rocket88]

I just ordered a bunch of 2.2uF non-polarized caps, while not cheap like a lot of the other caps we use, they're not too bad.  I think I bought 25 or 50 for under $10USD. I'd have no problem getting a bunch and splitting it up for those who need them for this build. But, I did see some sellers that wanted a ridiculous amount of money for them, some guy wants $30USD for like 10 of them.

[Kinski]

I have exactly two 2.2uf non-polarized caps. Not sure why I have them, but was glad to see them when I checked.

I really want to build this thing but I won't have time till for the next few weeks, due to being out of town for the holidays.

Pretty sure I can stuff this into a 125B!

[Muadzin]

Kinski wrote

Pretty sure I can stuff this into a 125B!

Eternal and everlasting glory to you if you can!

Methinks I'm going to wait a little as Madbean seems to be releasing the Dirtbaby as a standard release in januari. Although knowing his past release schedule it will probably be a little later.

[Jopn]

Hey guys,

I scored one of the few prerelease ones and I want to mention that there's some issues with the design for the tails.  If you're on the Madbean forum, you can look under the Build Reports section to see Jon Patton and I working on this.

For now, I would just build the true bypass version and wait for the updated schematic for the whatever tails fix Brian decides to implement.

It sounds fantastic though, much better than any of the other PT2399 delay's I've built.  

[Alex]

I've finally managed to build it and it's verified!

[Heath]

Gnarly!  Does it live up to the hype?

[Alex]

Didn't have much time to play around with it but it sounds good to me.
I don't even have an EH DMM to compare it to but you can find a video of the Dirtbaby here:
https://www.youtube.com/watch?v=vUt5TuDjhpU