help with my ibanez pedal

[loki]

hi guys, i own an Ibanez DE-7 Delay Echo Pedal.... it works great, but i have a little problem, when i power it up with the adapter set to 9v the pedal doesn't work.... when i activate it the led just lights briefly and then is off and no sound comes from it
but if i set the adapter to any value below 9v (even 4.5v) the pedals works correctly..... what could it be??? i don't think it's an adapter problem, cause i use it with other similar ibanez tone-lok pedals and it works good set at 9v  :shock:

[Ansil]

have you used a volt meter and measured the actual output voltage comign from the 9v selection...

i had  one when i was a teenager that did something similar and come to find out it was really cookin at the 9v level. like 15v or something..

[loki]

you mean to measure the voltage coming out of the adapter? yep i could do that... but it actually works with the other pedals

[niftydog]

but it actually works with the other pedals

that really doesn't tell you much.  The DE-7 may have some kind of current limiting or over voltage protection.

Try a REGULATED 9V supply.  Chances are that the 9V setting is giving you much more than 9V.

[Transmogrifox]

Does it work with a battery? Do you have the battery in the pedal while you're using the adapter?  Just thoughts I had...a current limiting function in there could certainly cause something annoying to happen.  Sometimes these 9V adapters aren't very accurate.  I've had some from 10 to 12 and sometimes 14V.  I had a 12V wallwart that measured 24 V open circuit and didn't get very close to 12 until it was sourcing its rated current.  They are usually designed for a specific load as they aren't regulated supplies.

That's an interesting problem  It would be interesting to track down a schematic for one of those.