Building the Echo Base PCB

[DrKoester]

OK thanks for the info.  I'm not going to pursue it, thought it may be simpler. 

So part of the reason I ask is because I'm attempting to re-purpose an already drilled enclosure and I'm left with one open hole.  Maybe I could have one LED for pedal engaged and use another LED to pulse when the LFO is engaged?  Is there a way to wire this?

Awesome board by the way and I love the pedal.  Will post pictures when i have it all painted.

[jumpchamp]

Maybe i just can't find it in this thread, but I have an issue with the feedback switch.

I have mine wired to a momentary (of course) and am getting some strange behavior. When I have the switch mounted in the box, I get signal passthrough, but no delay. Removing it from the box and the delay works as it should, and so does the switch. Is it fair to assume that I'm grounding out the delay signal somehow?

Pedal sounds great otherwise. Any thoughts?

[slacker]

That's a strange one but it does sound like something is grounding the delayed signal. Check that the wires to the switch are not somehow touching the case or the metal body of the switch, as this will ground them when its bolted to the case.

[jumpchamp]

slacker, thanks for the suggestion. i went over all my offboard wiring in detail, redid a few spots, and still the same issue.

as cool as that function is, i love how the box sounds so i just decided to take it out. only issue is that now i have a hole in my enclosure. however, i was going to do a light plate at the bottom, and instead decided i'll put an amp jewel in the hole where the switch was going to go. lemons, meet lemonade

[Ginsengbob]

Hey Taylor
I've finished an echo base pcb with the wave shape mod.
The modulation switches on fine and the depth and speed work but the wave shape pot has no effect.
Any ideas what to check?


Thanks

[Taylor]

The modulation comes out of  the waveshape pot so if it's doing nothing I guess you must have one lug of the pot unsoldered?

[Ginsengbob]

The modulation works.
It doesn't change when I change the pot.
The pot doesn't seem to change anything

[slacker]

What does the modulation sound like? If you set the delay time very short does it sweep smoothly up and down in pitch, like vibrato, or jump between pitches.
What Taylor said is the most likely thing, one end of the waveshape pot either isn't connected or connected to the wrong place.

[Ginsengbob]

It jumps between a hi and a low pitch.

[slacker]

From Taylor's documentation,  disconnect the red wire from the wave shape pot, that removes the square modulation. If you then get no modulation it means you have a bad connection on the blue wire, or a bad pot. If the modulation still jumps check the value of the 240k resistor, if it was too small it could be causing the problem.

[Ginsengbob]

Ok great
I'll be home to check in a bit
Thanks

[Ginsengbob]

Is  the 3rd hole of lfo speed still connected to the 1meg pot and the wave shape pot?
So it would be to the 3rd leg of the speed pot and also the first leg of the wave shape pot?
Or should the 3rd pad only go to the wave shape pot?
I've got a wire going to both.

[slacker]

Yes, hole 3 should be connected to the LFO speed pot and the wave shape pot.

[Ginsengbob]

Would it be ok to substitute a 51k resistor for the 50 k resistor or would it change the sound?


Thanks

[snarblinge]

Won't be a problem use the 51

[slacker]

That's the one for the LED isn't it, if so, the 50k is just a guide so 51k is fine.
Depending on what LED you use and how bright you want it you might need a completely different value.

[tombaker]

I know this is quite an old build but I've just made it from the pcb, including the humbucker resistor mod, the diode mod, the tails switch, a footswitch for LFO the waveshape mod and the runaway feedback mod.

Now my problems are that
a) the pedal boosts my signal a lot, the overall level is louder than the guitar plugged in without it, whether in bypass or not

and

b) my repeats or feedback is only a single repeat. Just one. The pot doesn't seem to do anything except when I flick the runaway feedback switch which does engage infinite repeats and the pot act in reverse, even though it's wired correctly. From the wiring guide on page 1 of this thread.

I've switched the pt2399 but that's not the issue.

Anyone have any ideas?

[tombaker]

Okay I solved the single repeat problem and have been able to retain the runaway repeats mod. I removed the diode lift mod along the way and don't notice any real difference.

But I do still have quite a large volume increase both in bypass and engaged modes.
Any help would be much appreciated.

[slacker]

Check to make sure the three 10k resistors connected to pin 2 of the top left opamp are really 10k. If one of those was the wrong value that could cause a volume boost. Check the soldering on those as well, a bad connection could also cause it.

[telebiker]

How do you think, is there a way to add LFO in to the circuit?