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It works now! Glad it was only that. Thanks you.

I am using a vactrol there, and the range is quite nice, from slow to not super fast. But I can´t set the depth low enough... I am not using anything on R51 spot in parallel with the pot/ldr, but as far as I understood that will affect the range, not the depth.

Which values could I tweak to get a near to zero modulation with the depth pot set at minnimum?

Nice! Tks for the hope:)

In your case, no repeats were coming too?

Hi!

Finished my aquaboy deluxe yesterday, but I am not getting any delayed signal.

As it was late, I didn´t debug much, but I checked that there was voltage to the correct mn3005 pins, and the ground was also ok. Signal is getting loud and clear to the first bbd, on pin 7. (Both mn3005´s are tested and working on other build)

I could hear clock noise as well, when adjusting the clock trimmer.

Then I noticed I have soldered D3, which is only meant for V3205´s. I don´t think it can do any harm, but it dropped the voltage going to the bbd´s. The battery I used for testing had about 8v, and the bbd´s were receiving about 6,5v.

I am hoping that by removing d3 and using a power supply it will work, but I am at work now and it will take 8 hours to find out.... Sorry for sharing my frustration, lol.

Can anyone think of another possible issue?

Tks!
André

Then again, the dirt bag was whining all along the pot rotation, so it was kind of different.

So, i built this version last year. Added modulation and double delay.

It works allright, but i get this whine with about 400 ms, maybe less.

I assume it has something to do with the mix pot or ots wiring.

With the pot maxed out or zero, it fades completely! Anyone had a similar problem? Should i shield the wires?

That also happened with my dirtbag, but adding a wire to the pots body (level), till the common ground fixed everything.

Really nice!

I had the same problem, but decided to build a new one with low profile parts and maybe even the stupid electrolytic arrangements (it doesn't look series wiring, as the anodes, or catodes in our case, are facing each other) as in the original DMM.

I also noticed those different values you mentioned, except for the 2.7K, made the changes but they haven't made my dirtbag sound like the original one. I may be missing something there, but I'll pay more atention on my new build... Anyway, for now I have really nice sounds coming from the unit, but it is a different beast for sure.

One thing I noticed is that the repetition starts with low volume (maybe have to tweak the gate around the ne570). That kills the crispy strat string attack on the repetitions, and maybe is responsible for what I perceive as dark first repeat.


The tone control is a really nice feature! I have done something similar to my DM-2 and it is really cool now. That piercing 12th or so repeat before going into crazy oscilation is gone, and it didn't affect the first repeats.

Will let you guys know how that went.


André

Hi!

Did anyone worked on aquaboy´s project file to come up with a clean pcb image? (I am really bad at this...)

Since I´ve been waiting for quite some time to grab one, but they are not in stock, I thought it was about time I tried to etch a board.

Tks!
André

This two helped a bit more.

I started to feel that maybe the problem was more related to the amount of low end. It was just so bassy that diverted from the fact that the bright content was ok. By ommiting the capacitors, the clock noise started to bother me, and it was still muddy after a few repeats.

I tried another approach then, by grouding a resistor (actually, a 500ohm trimpot) after to c32, so I that I have a high pass filter before the dry and wet signals meet again.

Though it messed with the balance, and the decay is faster, now the overall sound is not so cavernous, and closer to the original DMM. I was thinking of adding a swith to "stock" and modded, so I can switch faster for different situations.

André

Hi!

It did provide me more repeats, but I believe the signal that gets to this point should not already be so filtered.

I understand this cap is acting on the regenerations (successive high cut), but it didn´t change what is before it.

Since I could get almost 600ms without the anoying high pitched whine, I figure I can compromise 50 ms for a tad brighter repetead signal. I see many filters on the schematic, but I am still not sure which could make the biggets difference here.

Any other suggestion?

Tks very much in advance,
André

Nice! Tks very much.

Will try that and let you know.

Hi!

I built the Dirtbag few months ago (MN3005 version), and played quite a bit with it.

It sounds really nice but quite warm - great for textures and modulation, but not so great for slapback or patterns. SInce I never tried the real one, I supposed it was ok...the whole analog thing...

I could compare it with a 90´s DMM a few days ago, and realized that the repeats had quite a bit more high end (bright content) to it. It was still warm, but with much more clarity.

I´ve tweaked the trimpots a bit, but I am positive it is not just that. I was thinking of modding some fix values to see if I can get a similar result.

The DMM v in is about 15.4 - 15.6 V. I use a 15V power supply (not the road rage).

I figure I should mess with the low pass filters, in order to allow more high frequencies on the repeats (there should also be a high pass filter to keep it less muddy too).

Does anyone have a suggestion where to try first?

Thanks very much!
André

Awesome graphics!

So, I used a trimpot to lower the voltage supply for the whole circuit. Down to 6.5V-7V, the problem fades, but the headroom is seriously affected. Higher than that, it bleeds audibly. Does that give any clue I am not figuring out?

Hi! Can anyone help me with that, or let me know if also noticed a similar problem?

(1) Project Name - Lowrider Octave

(2) General description of the problem - It works ok, but I notice some fuzzy signal bleed off (all the octaves with a strong distortion) even with the pots down to 0 . It is not loud, but audible. As you increase the volumes, the ratio gets better, but it doesn't disappear...

For guitar it is really not a big deal, because the effect is not so (digital) clean anyway. For the harmonica, it gets in the way a bit. The element in the mic is really hot and drives just about any amp, so if I just want the lower octaves, the octave up adds a bit too much edginess to the sound.

(3) Steps that you have taken to try to resolve the issue - Move the I/O cables, but nothing happened - they are really short and the fit is really tight on the enclosure; I've tried to use 500k pots just to see if it would make a difference, but the bleed off is still the same; Audioprobed a bit, and even when I touch direct signal´s pot (down to 0), I get this signal.


(4) List any substitutions you used for parts/values - Changed the value listed on the mods for a stronger upper octave, but even stock the bleedoff is just the same.

Can anyone try to see if this is also happening to yours LR? Just open the amp's volume and turn all the knobs counterclockwise.

Thank you very much!
André

Finally! Apparently it was something to do with the feedback pot.

Thank you very much Brian and everyone that helped me for giving me the oportunity to build such an incredible effect! I am absolutely amazed by the sound!