Messages

I would get some solder wick or a pump and clean up the back- remove all extra solder and make sure there are no bridges. If you do, be sure to have the iron nice and hot and get in and out quickly as heating things up a 2nd time can bring it's own set of probs- but you are not removing/replacing any parts so that is good.
Good luck!

I had similar issue and it turned out to be a grounding issue. Your jacks are not close to the corners like mine were though. In any event grounding could cause it. I was going to ask if the LED works but looks like you might not have one hooked up as your switch board is not populated with LED or resistor.
Hope you sus it out soon-
C

Thanks! Loophole2!

So there is no way to end loop/play loop immediately? Looks like you have to stop, then hit play, correct?
C

+1 on what size?
thx
C

Paul--> builds bad ass pedals, has wicked licks, and can't focus a camera!

I am def going to be building a loophole- but most certainly without all the mods- prob just TB switch
C

This seems pertinent to our community! Enjoy-
https://picasaweb.google.com/CNovey/FuzzMakersRoundtable?authuser=0&authkey=Gv1sRgCPmz-buattGsEA&feat=directlink

I needed this list! Thanks!
C

Def need to bookmark this post!
Thx
C

Mojo question- does copper wire sound any different than reg wire? Solid vs stranded? Thicker/thinner? During my first build I would just be fascinated that after my big guitar cables the entire signal goes through this cheap thin wire. But it works, that is for sure.
C

Nice tip!

I would think they would work the same. Mammoth does offer a "diffused" LED right alongside a diffused submini incandescent bulb which doesn't require (and probably wouldn't work with) a current-limiting resistor. Are you sure you got an LED and not a bulb?

FWIW, you can make your own diffused led's with a little 1000-grit sandpaper and possibly a little 3-in-1 oil I often diffuse blue LEDs to reduce their retina-piercing intensity.

Thanks Jacob!
So I understand the testing/2nd half of your post more than the first. I have a conceptual dilemma:
-when I look at the circuit I cant help but wonder about the electron's movement- people talk of "flow" but I wonder if it is more like it "appears" =all over= and is sort of channeled and contained and controlled by the components. I guess it is drawn towards ground- but the idea of flow to me infers gravity and electrons seem weightless. I just had a thought- that I could imagine the signal being pulled and sucked to all the ground points- like magnets- vacuum holes- not flowing but being pulled through- and if there were no ground the electrons would just populate the circuit and not do anything- like birds on a wire- or static electricity for that matter- it does not feel like anything or hurt until you ground out on a door knob etc.

So you have all these vacuum holes (ground points) and you can adjust the aperture of the holes with resistors or variable resistors/pots in front/on top of the holes- which retards or lets free the "suction".
I still don't quite get the tranny above and the diode symbol is annoying bc I just want to feel like it is pointing in direction current is allowed to pass through it. I will get used to it- just think of it like an < symbol which is smallest value moving to larger value.

I could ramble on- it seems yes, i can just focus on the trim pot- which with your help i know understand as a valve restricting flow ,or suction of current being drawn through the zener diode, but I still wonder how the tranny comes into play because it is there too and the 3 items in question are not simply in series.

I am also drawn to the trace after the pot from before ground which loops around to pole 2 on the pot, and the transistor above the pot, and then the items after those. My curiosity and study make me appreciate there is a quite interesting and complex design

Thx again-
I think I will def try the method you suggest at some point in the near future! The 2k pot I have there now has a dramatic change in the last small bit of travel as does the gain pot. Not sure if the gain pot is worth experimenting with but worth considering.
Clifford

Is there more to the trim than in this photo? (red lines area) In other words if I study this area (tranny/diode/trim/loop?) will I be able to get how it works essentially or are there more things on the board that are directly involved?

[Madbean replied:"It can actually be any of those values, but 5k is stated as the value of the trimmer on the schem, so the same value applies as external.Take another look at the schematic: the trimmer is set up as a variable resistor. When it's turned all the way up, the Source of the BS170 is connected directly to ground. This means that you get the most effect when the trimmer is essentially "removed" (all the way up) from the path to ground. That's why the actual value doesn't matter too much. If you used a 100k, you wouldn't notice any change when turning it until about the last 10% of the rotation. But, between 5k and 2k, you just don't get a whole lot of difference."]

Hey guys- I asked Madbean about the Macheen external trimpot mod in a PM- I was unsure of the correct/recommended value. I think the info is worth starting a thread for others to read (and does not seem to be an inappropriate PM-->public posting!):

I asked:
I have searched the forums and the build sheet regarding the mod to put trim on external. I cannot find anything that states what the value of the external pot should be. I used a 2k.

Anyway- I guess I could assume a 5k would be the right value- no idea why I ordered a 1k and 2k to try- maybe they didn't have 5k at the time- I seem to remember for some reason.

Would just like to clarify if using 5k is best or if 2k or other would work fine too.

Madbean replied:
"It can actually be any of those values, but 5k is stated as the value of the trimmer on the schem, so the same value applies as external.

Take another look at the schematic: the trimmer is set up as a variable resistor. When it's turned all the way up, the Source of the BS170 is connected directly to ground. This means that you get the most effect when the trimmer is essentially "removed" (all the way up) from the path to ground. That's why the actual value doesn't matter too much. If you used a 100k, you wouldn't notice any change when turning it until about the last 10% of the rotation. But, between 5k and 2k, you just don't get a whole lot of difference."

Link to build sheet for ref:
http://www.madbeanpedals.com/projects/Macheen/docs/Macheen.pdf

Nice- love the big knobs and color. Let's hear it!!

C