PIMETA: troubleshoot request, problem with walwart.

Hi all,
My Pimeta was working great on battery, but the power don't last too long on 2x9v, so I wanted hooked it up with Elpac WM080-1950 (output:+24V;0.33A) with closed circuit CD jack which cuts off the power from the battery when the walwart power jack is connected.

The voltage that came in to the pimeta was 24V ( via walwart) and 14.4V ( via batteries), so there shouldn't be a problem with the wiring.
but whenever I connected the walwart and turned on the power, the LED barely lit up, sound came out from the earphone jack but soon dissapeared. It seemed that the current only trickled from the walwart. The LED was fully lid for a split second when I plugged in the jack, but soon dissipated to very dim light.

First I thought the diode impeded the current, so I removed it (this soon lead to disaster), but it didnt' help. I plugin and unpluged the jack several times and everytime the led barely lid. and at the very last moment the LED was fully lit before it immediately-completely dead, I smelled a foul odor. Dear god I think I burned something. it doesn't even turn on with battery now.

It is very frustrating!
what might have been damaged? I swapped opamp powered it on battery and it still wasn't working. What should I do?

What might be problem with running on the walwart? I want to have it fixed as soon as possible. please assist me.

regards,
-ADi-

Here's the detail:
Biased to class A.

Ground Channel
R1G = 4.32K
R3G= open
R4G=4.32K
R11=220
C6=10pf 50WDC

Left and Right Channel:
R1 = 4.32K
R2 = 1M
R3 = 1K
R4 = 10K
R5 = 3.32K
R6 = 1M
R8 = jumper
R10 = 1K
R11 = jumper

Powesupply:
4x 420uF 25V (C2/C3)
2X 6.8uF WIMA
2X 0.22uF 63V
Rled=4.7K
Diode = 1A 30V

Thank you Tangent, Magic77, and Jasonhanjk,
you're right, the amp is in a metal case.

any idea what damage might have been done?
what component might have been damaged? the TLE?
Where can I get the insulated jack? Mouser maybe? and if you have the part number on hand please tell me.

Thank you so much,
-ADi-

Thank you Magic77 and Tangent.
I connected the amp on batteries and the TLE got so hot that it burned my finger. What does it mean? I can't have it on with out the TLE getting hot now.

-Adi-

Thank you Tangent,
I isolated the input and output jacks with electrical tape, and the case being the DC ground, (the input & output jacks are grounded to virtual ground, and the DC jack is grounded to the case).


So now I manage to run the amp both on batteries and on walwart, the sound is great, no noise. But with the walwart it gets VERY hot with in a second. Even with the batteries, the TLE was still getting hot in about 4 seconds, although it never got as hot as with the walwart.

Then I removed the DC jack so the amp is connected straight to the batteries, and ran it, the TLE was still getting hot. I guess it's always been getting hot when I use it all this time, but I didn't notice how hot it gets untill I hooked it up with the walwart.


I am going to get the insulated CD jacks, and I hope it will solve the problem, but do I need to put a heat sink on the TLE? or something else is happening?

Thanks,

-ADi-

Forget my previous post that the batteries doesn't cause the TLE to be too hot. I ran it again on batteries just now, and the TLE was smokin hot, I mean literaly smoking. I immediately turned it off. the amp is still working however. This never happened before on battery power.

I dont' understand. everything is the same as before I messed around with the walwart (except that I put a new diode), but now the TLE is getting cranky. what might be happening?

-ADi-

ah that's not such a bad news, I hope that's the only one I might have involuntarily murdered. Thanks so much Tangent.

-ADi-

Thank you Magic77,
what would I do with out everyones help here?

-ADi-