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Post by kcatthedog on Feb 24, 2021 7:02:32 GMT -6
I have a stomp box that passes signal and works perfectly by itself meaning guitar plugged into it and output to the amp.
But when in series, it will pass the signal of the series, but it does not generate its own sound when turned on.
I have a brand new psu for pedals and have checked all cords.
The pcb in the pedal has been replaced. Could it be something simple like a bad solder joint on the input Jack?
Or It occurred to me that I could run it in parallel with a y ts (f=>m) from guitar cord, 1 end to pedal board 1st input, the other to the stand alone box, run pedal board out and single stomp box out to another Y ts (f=m), plugged into amp input? Just need the 2 Y ts cords as I have other guitar cords?
Work around thoughts?
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Post by kcatthedog on Feb 24, 2021 7:54:29 GMT -6
Tried y cable at front end, single stomp box works but stops as soon as other y m ts touches first box in pedalboard series.
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Post by stormymondays on Feb 24, 2021 9:12:29 GMT -6
That’s some kind of ground problem. When you connect more pedals together they share the audio ground. Maybe the input cables are reversed?
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Post by kcatthedog on Feb 24, 2021 9:18:26 GMT -6
Good suggestion: I’ll check!
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Post by kcatthedog on Feb 24, 2021 9:54:52 GMT -6
Can’t really tell as I/o is on a daughter board.
I notice on one ts female Jack, two of the centre solder joints do look a little off, a little discoloured, the others are smooth and shine like chrome.
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Post by svart on Feb 24, 2021 10:12:45 GMT -6
Are all the pedals the same power polarity? If you plug a negative-centered power plug into a pedal made for positive center it might work unless plugged into a pedal with the opposite polarity.
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Post by Ward on Feb 24, 2021 10:20:21 GMT -6
Did you build this one yourself or is it a commercially available unit?
If so, which one, please?
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Post by kcatthedog on Feb 24, 2021 11:12:39 GMT -6
Svart, not certain , how do I confirm that if all boxes are getting powers of same multi out psu?
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Post by jmoose on Feb 24, 2021 11:56:27 GMT -6
It's almost certainly a grounding problem. Audio is shorted to ground.
If possible run the suspect pedal on battery...
Are you using a daisy chain power like a 1 spot or a brick with isolated outputs like a voodoo labs?
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Post by kcatthedog on Feb 24, 2021 12:06:38 GMT -6
Donner DP-1 Effect Pedal Power...
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Post by johneppstein on Feb 24, 2021 14:06:56 GMT -6
That’s some kind of ground problem. When you connect more pedals together they share the audio ground. Maybe the input cables are reversed? My thoughts exactly! |
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Post by ragan on Feb 24, 2021 15:03:20 GMT -6
Svart, not certain , how do I confirm that if all boxes are getting powers of same multi out psu? Matt, the pedal may have a little icon near the power connection that tells you whether it's center negative or center positive. This denotes center negative:  |
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Post by jmoose on Feb 24, 2021 15:37:19 GMT -6
Donner DP-1 Effect Pedal Power... Not familiar with that one but smoogle check shows its isolated? And what kinda pedal are we talking about anyway? Reverse power... center negative vs positive? Most pedals are 9 volt center negative which is "Boss" style. Very few are center positive. Mostly fuzz boxes and select vintage stuff. Assuming you goof up & use the wrong power, some (most?) pedals have a protection diode which should self sacrifice leaving the rest of the circuit intact for an easy repair. But in all cases the pedal is basically dead until the diode is replaced. Some pedals don't have a protection diode and will instantly let out the magic smoke if connected to the wrong power source. Major repair or replacement. If you mix center positive & negative pedals on the same daisy chain power supply, it'll typically short the supply and may let out magic smoke and/or kill the protection diodes. In most cases the power supply survives. Another possibly rub is overdrawing the power supply. Even if its isolated there are only so many milliamps available... headroom... and if exceeded very weird things can happen! I've got easily a few dozen pedals and have owned dozens more. The only center positive boxes I've ever had are fuzzes, and I always put a piece of gaff tape over the adapter hole so nobody plugs 'em into a power source. Besides they draw so little current a 9 volt battery lasts forever anyway. |
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Post by Ward on Feb 25, 2021 7:28:05 GMT -6
Donner DP-1 Effect Pedal Power... Not familiar with that one but smoogle check shows its isolated? And what kinda pedal are we talking about anyway? Reverse power... center negative vs positive? Most pedals are 9 volt center negative which is "Boss" style. Very few are center positive. Mostly fuzz boxes and select vintage stuff. Assuming you goof up & use the wrong power, some (most?) pedals have a protection diode which should self sacrifice leaving the rest of the circuit intact for an easy repair. But in all cases the pedal is basically dead until the diode is replaced. Some pedals don't have a protection diode and will instantly let out the magic smoke if connected to the wrong power source. Major repair or replacement. If you mix center positive & negative pedals on the same daisy chain power supply, it'll typically short the supply and may let out magic smoke and/or kill the protection diodes. In most cases the power supply survives. Another possibly rub is overdrawing the power supply. Even if its isolated there are only so many milliamps available... headroom... and if exceeded very weird things can happen! I've got easily a few dozen pedals and have owned dozens more. The only center positive boxes I've ever had are fuzzes, and I always put a piece of gaff tape over the adapter hole so nobody plugs 'em into a power source. Besides they draw so little current a 9 volt battery lasts forever anyway. Excellent question. A few posts above, I asked kcatthedog which pedal it was or if it were one of his own creations. And although I enjoy the sound of crickets . . . |
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Post by the other mark williams on Feb 25, 2021 10:56:13 GMT -6
I would be fairly shocked if that Donner DP-1 actually has isolated outputs. It's probably a regulated supply, but isolated outs? I doubt it. It looks like the same one from Joyo (JP-02), and though Joyo markets that one as having isolated outs, I really don't think it is. It's not of the quality of a VooDoo Labs, Cioks, Strymon, etc. EDIT: I should explain - I'm not trying to be a gear snob with my above comment. I've just found power to be a place where it's worth spending extra money to make sure everything is locked in. A chain of guitar pedals introduces a particular kind of uncertainty even in the best of situations. Even with a fully isolated, very well made power supply, I discovered years ago that Klon clones simply don't play nicely with some of my other pedals due to the internal charge pump of the Klon circuit leaking into other pedals in my chain. I'd be interested to know if a different power supply might solve your problem, kcatthedog . All depends on how essential that one pedal is to your sound. |
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Post by kcatthedog on Feb 25, 2021 12:25:00 GMT -6
All good, perhaps I misspoke but I had the old boss system which literally connects all in series. So, the donner, at least, appears isolated ?
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Post by johneppstein on Feb 25, 2021 12:50:04 GMT -6
All good, perhaps I misspoke but I had the old boss system which literally connects all in series. So, the donner, at least, appears isolated ? In parallel, I'm fairly sure.
Series doesn't make sense for a variety of reasons.
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Post by kcatthedog on Feb 25, 2021 13:18:35 GMT -6
One after the other on the same line: parallel ?
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Post by ragan on Feb 25, 2021 13:24:52 GMT -6
One after the other on the same line: parallel ? They all have an independent path back to ground. Parallel is the way for them to all see the same voltage from the PSU. If in series, the voltage drop across each pedal would vary with their impedance. The easy way to test is to unplug one of the pedals on the daisy chain and see if subsequent pedals still have power (they will). It's like the lights in your house. Unplugging one bulb doesn't disconnect all the subsequent bulbs on that circuit because the way you wire them up lets each bulb have an independent path back to ground. For a general rule to remember: voltage is equal in parallel, sums in series. Current is equal in series, sums in parallel. |
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Post by kcatthedog on Feb 25, 2021 13:28:13 GMT -6
So they do have power, even if I disconnect one upstream, so that’s parallel ?
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Post by johneppstein on Feb 25, 2021 13:29:13 GMT -6
One after the other on the same line: parallel ? Electrically, yes. Doesn't look that way, but it is. Think about it for a minute... |
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Post by ragan on Feb 25, 2021 13:33:04 GMT -6
So they do have power, even if I disconnect one upstream, so that’s parallel ? Yes. Within the wire housing that's traveling from pedal to pedal, they each get the supply voltage and they each have a path back to ground, so each pedal has its own parallel branch of the circuit. |
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Post by the other mark williams on Feb 25, 2021 13:33:49 GMT -6
So they do have power, even if I disconnect one upstream, so that’s parallel ? Yep. It's like Christmas lights: if all bulbs go out when one goes out, then you've got a series strand of lights. Thankfully I'm not even sure you can buy a strand of Christmas lights in series anymore. They're pretty much all parallel. But parallel does not necessarily = "isolated" in the power supply for pedals game. |
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Post by jmoose on Feb 25, 2021 17:50:09 GMT -6
All good, perhaps I misspoke but I had the old boss system which literally connects all in series. So, the donner, at least, appears isolated ? I don't think Boss ever made a power supply? You mean something like an old PSA adapter with a daisy chain?! That's about the worst, most dangerous thing you could get. Still... what pedals & gear are you having problems with? Is it an overdrive? Delay box? Give us something to go on. |
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Post by ragan on Feb 25, 2021 18:53:18 GMT -6
All good, perhaps I misspoke but I had the old boss system which literally connects all in series. So, the donner, at least, appears isolated ? I don't think Boss ever made a power supply? You mean something like an old PSA adapter with a daisy chain?! That's about the worst, most dangerous thing you could get. Still... what pedals & gear are you having problems with? Is it an overdrive? Delay box? Give us something to go on. The Boss tuner pedal can act as a distributor. I've been using one that way for like 20 years. OneSpot to tuner, tuner to the rest of the pedals (unless a pedal has different voltage/current requirements, in which case it gets its own supply). |
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