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Here is my interpretation of this great build: http://www.madbeanpedals.com/forum/index.php?topic=7002.0

Thanks!

Thanks for this. It inspired me to build this here: http://www.madbeanpedals.com/forum/index.php?topic=7002.0

Hey there,

once again, thank you very much for the inspiration. I only changed the position of the LED's, thus having additional space for a battery between the two footswitches. I am not completely done with the fatpants part (still waiting for the J201s...), but the ego already sounds fantastic. So glad I did this. I will post additional pictures once I am completely done..


Thanks,
Matthias

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OK, I swapped the caps, C1 C5 and C6 seem to be right now. It sounds much better, more bass, more mids. BUT: still not a lot of gain, basically like a boost, but not an overdrive. Bridging D1 does not make a difference, switching to LED-diodes neither. What can I do next? Measure voltage at specific points? Would the help you guys to further guide me?

Best,
Matthias

Could be right, I will check. I found this item here: http://www.ebay.com/itm/WIMA-Polypropylene-Capacitors-FKP2-220pF-100V-6PCS-EACH-EXTRA-ITEM-0-50-SHIP-/110747804879, which might be a good hint!

I double checked my order, the one I ordered was this one: http://www.musikding.de/Passive-Bauteile/Kondensatoren/Folienkondensatoren/Wima-FKP2/FKP2-220pF-630V::1775.html

Could it be, that the one I put in C1 (labelled "220") is actually the one I am looking for (so, the value is written on it in pF)?

You guys rock, thanks a lot. Will order some and send an update. BTW - Great PCB, top notch quality!

I am not sure - it is labelled WIMA 0,022. Isn't that correct?

Hi there,

unfortunately, I got stuck with my project... maybe you have any recommendation for me (with your experience ;-)).

http://www.madbeanpedals.com/forum/index.php?topic=6823.msg58425#msg58425

Best,
Matthias

P.S. I should mention, that I trusted the handwritten labels of the vendor on the resistors and did not check the value for each resistor (based on the stripes on the resistors...). Maybe, if somebody is quick in reading these patterns, that would be a (even if not very likely) source of the problem.

Hi there,

I have build the ego driver according to specifications with the following parts:
OA1154 for D1
500 kA Pot for Gain
100 kA Pot for Vol

For testing, I did not use a footswitch yet, but simply hooked it up with a battery (so, no bypass at this point in time, which should not be a problem).

Problem: Vol, Gain and Tone Controls are working, but the signal is way to low (basically like the input signal, no overdrive at all). The diode clipping switch does not change anything in sound. In fact, when I remove the Diode D1, nothing changes either...

What I tried:
- As said above, removed Diode D1 - no change
- Changed orientation of D1 - no change (of course, given, that it seems to be irrelevant, whether the diode is in there)
- Removed D4 and D3, no change.
- Checked soldering (see images - I removed the pots again for a cleaner view on the soldering side of the PCB)
- Checked IC (TL082, took it out and put it in again, sound stopped when I took it out)
- Checked Orientation of Elkos and transistors, LEDs and Diodes
- I use metal film resistors and Wima Capacitors for the rest of the build

Slowly running out of ideas - would be great, if somebody could send some help (and motivation ;-)).

Thanks for the information - yes, I plan to add a toggle switch for the order of the two effects. I will post results, as soon as the PCBs arrive and I finalize this build.

That looks great, I also dig the green one I saw somewhere here. As I ordered the parts to build one myself, I would have two questions: Do you have any sound samples of this? More important, you write, that the fat pants signal goes into the EGO driver. Did you consider/try it the other way around? Would be glad to hear/read from you.