Question for Aron or R.G Keen or anyone who could help.

[coxter]

Hi, I've been trying to build the ShakaExpress pedal while following Aron Nelson's PCB layout.
Hope Aron or anyone can help out in a little clarification. 5 questions, illustration provided.

1.) The PDF says you've added a Power supply filter cap, but no value was given. Got reference anywhere? Or is there anyway i can find out?

2.) This two points are untouched are they suppose to be connected? Because it seems like they should. Or could i be wrong?

3.) What does R12 do? I've figured out about the rest.

4.) Do i connect my black end of the battery clip wires to the input ground? Just checking.

5.) Same as question 2




Thanks in advance for any help! deeply appreciated!

[RaceDriver205]

For 5 and 2 it looks like there should be a wire link connecting the two pads.This is done over the top of the board with a cut-off resistor lead.
For 1 a 100uF capacitor should be fine.
For 3, yes, the black wire is GND and the red wire is +9V

[petemoore]

  Here's the schematic
  http://www.diystompboxes.com/pedals/ShakaExpress.pdf
  1.) The PDF says you've added a Power supply filter cap, but no value was given. Got reference anywhere? Or is there anyway i can find out?
  Anything 100uf+ should do the trick, some get fancy and add a teeny cap to catch the HF's electrolytics don't...?
2.) This two points are untouched are they suppose to be connected? Because it seems like they should. Or could i be wrong?
  With the schematic you can sort it out, getting late here...
3.) What does R12 do? I've figured out about the rest.
  I'ts wired 'like a volume control, between stages this way it reduces gain, hence it'd be a gain reducer, and adjust hardness of clipping of *latter stages as a result of amount of volume allowed *in.
4.) Do i connect my black end of the battery clip wires to the input ground? Just checking.
5.) Same as question 2

[coxter]

Alright thanks alot man. Sorry if i'm asking the obvious with regards to 2,5, and 3. But its my first pedal. Just wana be sure.

[aron]

if #2 is pin 8 on the TL072, then it's the power pin and should be connected to V+. The black wire of a battery goes to the ring of the input jack. See the FAQ link above.

R12 is almost like a "preamp" master volume.

Good luck with your build.