Behringer BDI-21 vs generic power supply

[EliasMooseblaster]

I've just (finally) invested in a fairly generic power supply for my pedals, as my BDI-21 seems to be a bit of a battery gobbler. I connected everything up to find that the 4-way power unit worked fine with all my pedals...except, ironically enough, the BDI-21. Are there any known idiosyncrasies to this pedal's DC socket, or do I need to pop it open and check for a loose wire?

- the polarity is correct (centre-negative, same as my other pedals)

- it's definitely not over the current limit

- another Behringer pedal worked without complaint.

The BDI works fine on battery power, but when I connect the DC, it goes completely dead - no status light, no sound, nothing. Anyone else seen this?

Edited September 5, 2019 by EliasMooseblaster

[paul_5]

Pop the back, could be a short somewhere if it's draining batteries quickly; they're only supposed to draw 25mA.

[pete.young]

Mine runs quite happily off a standard 9v centre-neg daisy chain and wall wart with no isolation, so I think you need to have a look at your BDI21.

[tauzero]

I've encountered this on one or two Behringer effects - IIRC there's a protection diode on the DC socket to prevent reverse voltage being applied to it and that can fail.

[EliasMooseblaster]

10 hours ago, tauzero said:

I've encountered this on one or two Behringer effects - IIRC there's a protection diode on the DC socket to prevent reverse voltage being applied to it and that can fail.

Aha, that might do the trick! I popped the back off yesterday, but I couldn't see anything that was obviously loose or damaged - I guess the drawback to PCBs is that it's often difficult to tell if a component's simply conked out. Do you happen to know whether said diode is accessible and/or easily replaceable?

 

(Though to be honest, I'm leaning more to the idea of moving it on with the caveat of the faulty DC-in...)

[tauzero]

I don't know, I'm afraid it's just a vague memory.

[Microbass]

Both my BDI's are battery drains, but no issues running from a power block or dedicated 9V supply. Does it just not turn on? 

[EliasMooseblaster]

Yeah, inserting the DC jack just kills the pedal. Works fine if I disconnect and just run from the battery, but I don't even get an audio signal through it with the DC connected.

[itu]

A picture would...

[Jack]

FWIW my guitarist had the guitar version of this and exactly the same thing happens. It sits on his board largely unused because he normally uses his own amp, we get to a supplied backline gig where he doesn't like the amp, decideds to use his pedal instead and nothing. Same method of failure you describe.

 

He didn't fix it, they're <£15 on ebay. Hell, they're about that new.

[Groove Harder]

Is the 9v jack pin long enough? Sometimes - especially with daisy chains - you need to strip some of the rubber round the pin so it will seat into the socket properly. I've had to do this with Joyo pedals, not sure about Behringer though. 

[EmpInfNed]