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AMB Mini3 Issue

post #1 of 16
12/3/10 at 11:33am
Thread Starter 

Half the time I so much as touch the volume control on my Mini3 it spikes to full volume and it was working just fine yesterday.

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post #2 of 16
12/3/10 at 11:07pm
Thread Starter 

bump

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post #3 of 16
12/4/10 at 11:14pm

Maybe the stereo potentiometer is damage, try to replace it..

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post #4 of 16
12/5/10 at 10:22am

Pics of your solder job?

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post #5 of 16
12/5/10 at 4:57pm
Thread Starter 
Quote:
Originally Posted by wompa164 View Post

Pics of your solder job?


I bought it used back at Feb. I didn't build it myself, sorry if that's the impression I was giving out.

 

thought i might try a solder repair, since the problem goes away when i push down any of the Jacks or the Volume knob at the front of the amp



Quote:
Originally Posted by RuiCanela View Post

Maybe the stereo potentiometer is damage, try to replace it..



well i already looked into that along with maybe buying  2 new jacks, the stuff is very cheap. what I wanna know is the shipping cost and delivery time.


Edited by Fortgammon - 12/5/10 at 5:06pm
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post #6 of 16
12/6/10 at 1:17am

Pics of it

IMG_0443.JPG

IMG_0444.JPG

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post #7 of 16
12/6/10 at 2:52pm
Thread Starter 
Quote:
Originally Posted by RuiCanela View Post

Pics of it

IMG_0443.JPG

IMG_0444.JPG



Thank for the effort, but I solved the issue I added some solder to the 4th and 6th point of the potentiometer and now no spikes on the right driver (forgot to mention the problem was only on one side) I guess the solder was too light and I dropped it a couple of time throughout the months. thanks for the help 

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post #8 of 16
12/6/10 at 9:13pm

Those battery terminals are ridiculous, how are they even attached? There is like NO solder holding the B- contact in place, that hole needs to be COMPLETELY filled with solder.

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post #9 of 16
12/7/10 at 1:16am
Quote:
Originally Posted by wompa164 View Post

Those battery terminals are ridiculous, how are they even attached? There is like NO solder holding the B- contact in place, that hole needs to be COMPLETELY filled with solder.


I know, those are just like that because I need to desolder to trim when I get the battery that will use. (Rechargeable).

 

 

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post #10 of 16
12/12/10 at 3:11am

ok quick question..can i change the opamp in mini3 with any class AB opamp with minimum input voltage2.5V and above?

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post #11 of 16
12/12/10 at 3:11am

double post

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post #12 of 16
2/27/11 at 12:45pm
Thread Starter 

OK now I have another issue, My mini3 now only at max volume outputs sound on the right driver and at a extremely low volume, I notice brown stuff on almost every solder point at the back but don't notice any leakage from any of the components, not sure how this is possible unless something spill on my Mini3, but i don't see how that's the case ethier

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post #13 of 16
2/27/11 at 11:26pm

Might be leftover flux that got burned due to the parts overheating.

 

Are your ferrite beads elevated?

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post #14 of 16
2/28/11 at 10:51am
Thread Starter 

i don't know, what are those? and what would a elevated one look like?

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post #15 of 16
3/4/11 at 1:13pm
Thread Starter 

Well I ordered the 2 high performance opamps list on AMB's site from digikey, everything came to about $12, hope this could get my Mini^3 working again

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