Build Your Own Clone Message Board

As the title says... I'm getting a single slapback in echo mode, and NO delay in ping pong mode. I tried using an audio probe in echo mode, and here's what I get:

Point 8 - single slapback
Points 9 and 10 - very quiet single slapback
Points 11-14 - nothing

Hope these pics help...








Thanks in advance!

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Build me a new pedal... and step on it!

Hey there DOD - Try testing continuity between brown points 12 - 11, 12 - 10, and 12 - 9. Also, test your toggle switch and make sure none of the poles are grounded and the poles make contact as they should.

A lot of times, getting only that one repeat is a sign of a short to ground somewhere, so look for that (backs of pots touching pcb, toggle grounding to something). Getting no delay in ping pong might point to a fried toggle switch.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

I do get continuity between all those points, and the switch seems to be contacting as it should. None of the poles read to ground either.

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Build me a new pedal... and step on it!

Okay - how about voltages? Any weirdness there? Also, try swapping the delay chips or trying them one at a time to see if you isolate part of the circuit.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

Have you audio probed the entire feedback path, for both modes? I'd be interested to know where the feedback stops on the pong side in parallel mode.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

Ohhhh... I actually have this backwards... I'm getting a single slapback in PONG mode (switch up) and nothing in echo mode (switch down). I tried swapping the chips, and it made no difference... I still get one repeat, and only the ping knob effects the time.

I will check the voltages tonight or over the weekend.

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Build me a new pedal... and step on it!

OK... some clues...

All my voltages and grounds are OK.

On the dry signal path, I have signal up to point 31, and then nothing at point 32. That 10K resistor is bad??

On wet signal path A, I have signal up to point 14, and then point 15 gets VERY quiet.

I tested each resistor with a meter before putting it in because I am colorblind... but can somebody check those 2 10K's in my pics, just in case I screwed up?!

I haven't checked wet signal path B yet... I'll try it after I straighten out these 2 problems.

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Build me a new pedal... and step on it!

Yes - or it has a cold joint. I tested my pedal and I get very strong dry signal on both sides of R24.


That seems okay, I get something similar. The signal does get weaker after that resistor. You might touch up the joint to make sure it is conducting fully.


They look fine. That whole row of resistors are all 10k and all yours seem to match that.


While you're in there, make sure and follow all of the trouble shooting instructions - you never know when something weird will pop up.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

Thanks Morgan... that's exactly what it was. I re-flowed the joint, and life is good!

I'm a bit embarrassed that I didn't find that myself. However, I am proud to say that this is the first pedal I've ever built that didn't work first-shot. Even my VB-2 fired right up, and that was the most complex build I had done... until THIS one!

Thank you, again, for your help!

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Build me a new pedal... and step on it!

NO!!!!!!! It was TOTALLY working, then I put it back into the enclosure and it's doing the SAME THING again!

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Build me a new pedal... and step on it!

No!!
It's a short. Something is grounding out on the enclosure. I'd pull it out of the enclosure one more time to verify that it works fine outside. If it goes back to not working properly when in the enclosure, that means something is either touching the enclosure that shouldn't be, or something is getting bent or tweaked when you tighten things down. See if you can make it happen when the circuit is out of the enclosure by poking and prodding.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

OK... here's the deal... it didn't work outside the enclosure, then I re-flowed that joint and it started working. I checked both the echo and pong modes, and everything was working great.

Put it back together, and it stopped working again. I took it back out of the enclosure and it still doesn't work... signal dies at R24 again. Tried poking and pushing some components... no difference.

I re-flowed as many of the joints as I could (can't get to some because of the pots). Still not working (outside of the enclosure).

Now the damn battery died on my meter. I have to get away from this thing for a while or I'm gonna throw it! I'll get a new battery and take another look at it tonight. I'll go through the entire troubleshooting section of the instructions, and post the results.

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Build me a new pedal... and step on it!

Sounds good. Remember that this circuit is very sensitive to power - try to test it using a 9 volt adapter whenever possible.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

FRUSTRATING! mINE IS BEHAVING THE SAME WAY!

I had the exact same problem.

Coincidentally when I re-flowed point 32 it started working flawlessly. I have yet to put it back in its enclosure so I'm a bit worried

I need a pcb for the dd-80. I have all the parts but the board. Someone help me!!!!!!!!!!!!!!!!1

The DD-80 has been gone for quite a while. The Ping Pong is basically 2 DD-80 circuits in series/parallel, but I think you have to buy a kit to get the board these days. You might try posting a want to buy thread in the for sale forum. Also, you can get a Rebote 2.0 or 2.5 from Tonepad which are both similar to the DD-80.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker