DirtBag Deluxe and the X-Vive MN3005

[Cybercow]

With the now available release of X-Vive's MN3005, will the DirtBag Deluxe be considered for putting back on the available for purchase list?

[danfrank]

Lol!
It's funny that you posted this as I emailed MB 3 days ago and asked him if he had any of these boards left! Maybe the interest here will get a run of boards made. Fingers crossed!

[Aentons]

I have 2 xvive 3005's that i'm itching to use so I'm definitely interested in the DB deluxe as well. Mainly because of the negative ground.

But...

https://www.madbeanpedals.com/forum/index.php?topic=29429.msg285244#msg285244

I probably could do a negative ground version for use with the Xvive. It's just not something I've thought about. But, it wouldn't be too hard to do one that runs on +18v. Maybe even a 3-chip version for a bit extra delay.

If a negative ground revamp of the TR is the better path, then I am more than willing to wait

[jimilee]

Isn't the total recall a remake of the dirt bag deluxe?


Sent from my iPhone using Tapatalk

[danfrank]

Yes it is,
BUT
TR is a positive ground effect, DBD is a negative ground effect which lessens power supply issues.

[Aentons]

TR is a positive ground effect, DBD is a negative ground effect which lessens power supply issues.

I could imagine that both the + ground and 24v requirement is a deal killer for some. Unfortunately, it is for me.

From the TR build doc:

It's positive ground and it requires a wall-wart. There's no getting around it. If you want the true vintage DMM, you
have to design it to use a wall-wart or AC power plus a transformer. I use, and recommend, an actual EHX 24v
supply.

[danfrank]

Yeah, DBD could easily be powered by a standard 9 volt neg center supply and a charge pump for 15v regulated.
BTW, have y'all looked into the LM2937 and LM2940 series of LDO voltage regulators? Only need 0.5 volts over regulated output voltage to work. These would be much better suited for the Road Rage and other similar charge pump voltage doublers than the old LM7815 regulators. All my LT1054 doublers put out around 17.5 volts which is marginal with the 7815 regulator.

[DLW]

Yeah, DBD could easily be powered by a standard 9 volt neg center supply and a charge pump for 15v regulated.
BTW, have y'all looked into the LM2937 and LM2940 series of LDO voltage regulators? Only need 0.5 volts over regulated output voltage to work. These would be much better suited for the Road Rage and other similar charge pump voltage doublers than the old LM7815 regulators. All my LT1054 doublers put out around 17.5 volts which is marginal with the 7815 regulator.

VFE builds call for LP2950 LDO regulators.

[Aentons]

So did the DBD with a roadrage chargepump only run at at 15v?

Would there be anything stopping you from using 12v in and pumping up to 24v?

[Scruffie]

So did the DBD with a roadrage chargepump only run at at 15v?

Would there be anything stopping you from using 12v in and pumping up to 24v?

Depends if you like your $20 chips with a smoked flavouring.

Unless you mean for the regulator, in which case no, it should be okay at 24V.

[Aentons]

So did the DBD with a roadrage chargepump only run at at 15v?

Would there be anything stopping you from using 12v in and pumping up to 24v?

Depends if you like your $20 chips with a smoked flavouring.

Unless you mean for the regulator, in which case no, it should be okay at 24V.

Yep, just talking about external power into the regulator. I guess I'm just trying to understand why the need for 24v when it only really needs 15v. Isn't the extra 9v just wasted thru the regulator or does it play into the "true vintage" aspect in some other way that isn't obvious to an ambitious novice such as myself?

Edit: Sorry, just realized that it's not obvious that I am conflating the DBD and the TR into a single concept

[Scruffie]

Both versions technically only need 17V in to the regulator. But the Total Recall is based on the reissue DMM which used the EHX 24V regulator which unloaded puts out something like 30V, so yeah, most of it's just wasted.

The Dirtbag took + voltage relative to ground though, the Total Recall expects negative.

[Aentons]

Both versions technically only need 17V in to the regulator. But the Total Recall is based on the reissue DMM which used the EHX 24V regulator which unloaded puts out something like 30V, so yeah, most of it's just wasted.

The Dirtbag took + voltage relative to ground though, the Total Recall expects negative.

Thanks for the confirmation Scruf!

[Flyrite]

Heck, I believe I have an extra Dirtbag Deluxe board in the closet stash. Got two for me and my father but he bought a vintage Memory Man before I could finish his. Its populated and was working/biased just never put it in its case. Lol Had some trouble building them for sure but they were great pedals once up and running!

[jimilee]

Dang, I have both. You can always have more delays.


Sent from my iPhone using Tapatalk