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Mini3 not working - Page 2

post #16 of 35
9/1/10 at 1:45pm

 

Quote:
 OL and OR are not reading anything except 1 at the left part of the screen

 

Did you try selecting a higher range on the meter to see if you can get a reading?

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post #17 of 35
9/1/10 at 2:21pm
Thread Starter 

ok i changed the range,they are both now have the same reading at lowest volume of 1.6mV and on highest volume they are reading 1.9mV.

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post #18 of 35
9/1/10 at 10:37pm
Quote:
Originally Posted by midoo1990 View Post

ok. OG is the only one reading with IG. it is reading 2.5mV in any volume position.

OL and OR are not reading anything except 1 at the left part of the screen(i am using manual ranging multimeter) on any volume.

 

Quote:

Originally Posted by midoo1990 View Post

ok i changed the range,they are both now have the same reading at lowest volume of 1.6mV and on highest volume they are reading 1.9mV.


When you tested the DC offset at OG, what meter range did you select?  I find it strange that you would have it set differently between OG and OL/OR originally.  And what range did you set the meter to on the second try with OL/OR?  I suspect that some of these readings are not in mV (millivolts), but V (volts).

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post #19 of 35
9/2/10 at 2:14am
Thread Starter 
On OG the multimeter was set at 200mV while on OL/OR it was set on 200v. And it also reads on 20v but the difference between the results is 0.20.
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post #20 of 35
9/2/10 at 5:06am
Thread Starter 

so,whats the problem? i will take some pics now and upload them..

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post #21 of 35
9/2/10 at 6:28am
Thread Starter 

 

 

DSC04663.JPG

 

 

 

 

 

 

 

DSC04665.JPG

 

DSC04673.JPG

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post #22 of 35
9/2/10 at 8:16am

Measure the DC voltage across your battery contacts.  What is it?

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post #23 of 35
9/2/10 at 10:06am
Thread Starter 

^^12.7mV.

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post #24 of 35
9/2/10 at 9:45pm
Quote:
Originally Posted by midoo1990 View Post

^^12.7mV.


That's a really dead battery.  Is your D4 zener diode shorted?

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post #25 of 35
9/3/10 at 2:46am
Thread Starter 

oh,i didnt know you want me to measure the battery installed.i measured something else.sorry for the misunderstanding.it is measuring 9.11V.


Edited by midoo1990 - 9/3/10 at 2:47am
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post #26 of 35
9/3/10 at 3:37pm
Thread Starter 
Any help please?I really want it to work.I have been holding off on finishing y2 untill I finish this.any suggestions on what might be wrong?
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post #27 of 35
9/3/10 at 4:01pm

Please confirm that DC offset on left and right channels is over 1 V ?! It should be under 20 mV in working amplifier.

 

Could your AD8397 be installed wrong way?

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post #28 of 35
9/5/10 at 1:25am

Cont test everything. One bad joint and you're now looking at a completely different circuit than what's in the schematic. Make sure everything that's connected should be, and also make sure that you haven't inadvertently connected anything that shouldn't be (for example, adjacent IC terminals).

 

Next, print out a copy of the schematic, pick a reference point (the negative battery terminal should be good), then start measuring all node voltages with respect to that point and recording it on the schematic. Pay special attention to the IC terminals (it wouldn't be the first time someone let the magic smoke out). Double check that all of the values are sane. (You need a function generator and preferably an oscilloscope to be thorough here, but a DC check is a start.)

 

That LED you got backwards isn't the only thing in the circuit with a polarity, and you already got one thing reversed. Check that everything is the right way around. Including the ICs.


Edited by gimble - 9/5/10 at 1:27am
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post #29 of 35
9/5/10 at 3:14am
Quote:
Originally Posted by midoo1990 View Post
any suggestions on what might be wrong?


No offense but... To me it seems you've bitten off more than you can chew.

Having said that, U1 is installed backwards. It should be 180° reversed, flat side away from the battery. Check the silkscreen, orientation should match it. Diodes, zener and electrolytic caps orientation appears correct. Verify the orientation of that yellow tantalum. Are the opamps installed as they should be?

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post #30 of 35
9/5/10 at 4:25am
Thread Starter 
Quote:
Originally Posted by Beftus View Post




No offense but... To me it seems you've bitten off more than you can chew.

Having said that, U1 is installed backwards. It should be 180° reversed, flat side away from the battery. Check the silkscreen, orientation should match it. Diodes, zener and electrolytic caps orientation appears correct. Verify the orientation of that yellow tantalum. Are the opamps installed as they should be?


this is my first DIY project and i am taking it as a learning process.i try to absorb as much as i can and there are many things that i cant understand.i am trying to be constructive in summer and learn as much about electronics before university starts.its not important if the whole mini3 blew up or something because as i said i learnt alot from this project along with the 2 gamma2s i am trying to finish.

 

your criticism for me is uncalled for.i am sure you also werent bright on your first attempt in building something.

 

i will check everything again now and report back today.thanks for everyone who helped me so far.
 

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