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Old 6th June 2004, 09:14 PM   #1
ble0t is offline ble0t  United States
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Default One channel is louder than the other?

I have my NIGC working, but one I am having problems with one of the channels. Currently, the left channel sounds great...nice and clear and loud. However, the right channel is quite soft and dull. Any suggestions as to what I should look at first?
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Old 6th June 2004, 09:50 PM   #2
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I have double checked all of my connections, and I have tried connecting the speakers directly to Output and Output Ground (I am using BrianGT's board), and the same problem persists. I'll try re-soldering a few connections...
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Old 6th June 2004, 09:57 PM   #3
HDTVman is offline HDTVman  United States
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VERY carefully check all cap and resistor values.

BZ
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Old 6th June 2004, 10:18 PM   #4
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Everything appears to be in order...the rail voltages are good (+/- 34V) and the input and output connections seem to be fine. Could something be a miss with one of the caps?
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Old 6th June 2004, 10:42 PM   #5
HDTVman is offline HDTVman  United States
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Did you check the values of all of the resistors and caps? An electrolitic in backwards in the feedback circuit could be at fault.

BZ

An oscillation could be the problem too.
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Old 6th June 2004, 11:09 PM   #6
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All the resistor values are correct. I don't have the ability to test the caps (1500uF) due to the fact my DMM only goes to 20uF, but the polarity is correct as far as how they are mounted. The one thing I noticed as far as the board is concerned is the fact that the feedback resistor isn't soldered all that great...I was going to try and re-solder it in a bit.

Also, it doesn't seem like there is a lot of distortion or problems with the outputted sound...it is just substantially softer.
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Old 7th June 2004, 12:33 AM   #7
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Do you have another chip you can swap in there?
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Old 7th June 2004, 01:24 AM   #8
ble0t is offline ble0t  United States
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Ahhh crud....I was hoping you wouldn't say that...

Unfortunately, I don't...I've been looking to order some more to play around with, and now looks like as good a time as any I guess. Anyone have any other suggestions?
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Old 7th June 2004, 03:02 AM   #9
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I don't think it's the chip. They work or they don't. The gain of the chip is controlled by the feed back in the circuit. The only thing that can cause this channel to be different from the other is:

1. A different feedback ratio (resistor values or short)
2. More loss in the input circuit (resistor values or short)
3. Lower input impedance loading down the source (resistor values or short)
4. High impedance output circuit (solder joint or bad speaker ground)

If it was the chip there would be a lot of distortion.

Later BZ
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Old 7th June 2004, 06:30 AM   #10
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I had the similar problem, but it is on my left channel. I sloved it by touching the pin 1 of the chip while I am measuring the feedback resistor and pin 1 and the amp is running. However, I will suggest you to resolder the components instead. Check for shorts, and make it clean (tips : you can clean each solder joint by whiping the joints with
rubbing alcohol, then you will have a shinny joint with no yellow stuffs on it.) Rmember Safety first !
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