freestompboxes.org

roseblood11 wrote:Try this on the zendrive, I guess it's the "Simble Mod"...

Hi,
Still use the asym bat41's then?
Thanks!

Noticed that a friend had one for sale, so being an unemployed broke ass f**k that i am, i first tried to trade it in. I made my intentions clear in the first message i sent him, so he agreed to lend it to me for a few hours. He sold his unit already and he'll be shipping it away tomorrow, so i only had two hours and i drove ~65km to get it. As soon as i was on my desk with the pedal, i opened it up. Damn. All this to see a board with goop + sanded semiconductors.

So here are some photos i managed to get. Could be enough to determine the topology, but not nearly enough to do a full trace. Like i said. It's a friend's unit and he sold it to someone else already. So yeah. I'm not going to even try to degoop it. Guess it's time to drive another 65km to take it back.

Oh no! Unlucky man. I bet someone here will still be able to see what it is (with a bit of luck).

Due to goop (and the sound), i'm hopping into the bandwagon guessing it's slightly modified Zen. Or why else would they try to cover it up..

Yeah next to pin 1 and 2 is a small cap probs around 100p and 2 transistors which are quite possibly 2N7000 in the feedback loop for clipping. I will have to have a closer look to see what I can see, but it definitely looks quite zen like at the moment. Mad professor usually has something quite unusual in there circuits though so it would be good to get the goop off and have a better look.

MoonWatcher wrote: Does Mad Professor goop their stuff any longer?

Hi

I have suggested no goop on the Mad Professor pcb series and none of my designs therefore have that. On the HW series there was a problem with the neoprane they used being too thin and so factory suggested they'd use a rubber housing which I think is good since it makes any short circuit impossible. I will say it does make a little pain to set bias precisely exactly nice on the HW MYT and also bias on TOP-setting either of those perfectly is easiest by ear while not so easy instruction for someone to set on a scope. This means MP pcb designed by me have no goop and no sanded parts, MP HW series designed by me if older edition is wrapped in neoprane and rubberband and later editions have a plastic container that the pcb rests in. Generally pcb models have the latest upgrades since changes can only be done when pcb is remade.
So actually when asked by MP crew if I'd like pcb or part of pcb gooped I have asked them not to do so

Simble is designed by a Finn and is manufactured and marketed by Mad Professor Ltd, while per definition it cannot be a Mad Professor pedal since Mad professor Ltd a while ago elected to not have BJF-design printed on the pedals as it anyway would be evident that all Mad Professor products are designed by BJF, the Mad Professor himself.

I did play the Simble at NAMM and thought it sounded like something lots of people would like. Subconsiously and soundwise it reminded me of a Zendrive but it did not do the fluff at the end of notes that the hardcore Zendrive guys swear by.


At your service
BJ
BJF Design
Aka Mad Professor himself

...

Hi There,

Indeed this is a a Lassi Ukkonen design and in that it is a Simble and not really a Mad Professor pedal.

I'd say I know nothing of this pedal other than I have played one- Simble.com would not share the schematic with the designer of MP Amplifications

So this is a major non understanding issue and in afact I have no idea if MP shares my schematics with Lassi at Simble

You might then ask why I'd still design for MP and the answer would be they owe me years of investments.



At your sincere service
BJ
In no way affiliated with Simble

just a glance at it and it has 8 poly caps...aside from the usual feedback loop and electros...zendrive has only 4. there's something else going on here...

i suspect this is similar to the barber tone pump without presets for mids or bass...and mosfet clipping.

This needs to be degooped. Sadly the price of even beat, used units is a bit steep for me.

Wonder if MP owes still a lot to Björn...
+m

+1 on decoding this one...

I'd also like to know..

tried one today, wow.
is there a schematics?

Wow this one wins the prize for longest time without reversing in fsb!

And still retains its crown. No tracing yet...

swt wrote:And still retains its crown. No tracing yet...

What is the benefit of that, when members of this forum will not have free pcb layout on this page anymore?!?
Have you not noticed that some contributing members of this forum lately want to charge for their work through sales of premade PCB-s?!?
There are no more free pcb sketches in this forum. You are doomed to buy suspicious pirated PCB from forum members WITHOUT guarantee that they are 100% correct.
Who cares anymore! There is no more freestompboxes here, haha!

OOo btw. ZENDRIVE sound better IMO. I have compared this two pedals,and this pedal sounds brighter and not so good as it is presented on the YT!
ZENDRIVE wins for DUMBLE emu!

Schematics alone is a big help, especially for people like me who likes to draw our own layout or for fixing some broken stompboxes.

and some schematics are not shared by the pcb designers, or it takes a lot time before they release the schematics.

This one was a fun one.

Aside from the goop there were a couple dummy traces like the one in the pic below, as well as a handful of decoy components.

I'll post a schematic once it's verified. (It's definitely Zendrive-based, just FYI)

Thanks a lot bugg