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Dave Sans  
#1 Posted : Sunday, November 5, 2006 3:26:09 PM(UTC)
Dave Sans

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Hello

I hanve one channel of my T X-BOSOZ working but there is really no gain I can turn the volune up all the way it dosen't get very load at all. Also whats the best set fot the volume control input or output?

Regards

Dave
eapavant  
#2 Posted : Sunday, November 5, 2006 5:07:02 PM(UTC)
eapavant

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Hi, I have a JT on the output it sounds much better that way to me. I tested it with a pot on the input and I think I remember I had the same problem. Hope this helps.
Dave Sans  
#3 Posted : Thursday, November 9, 2006 8:19:59 AM(UTC)
Dave Sans

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Hello
Still having problems with low output gainBrick wall I check the FET’s they seem fine. I had to replace a few of them when I first put the preamp together because I installed R1, R2, R6, andR7 wrong I fixed that replaced the FET’s that bring to where I am now. I was reading the original thread on diyaudio.com looking at the PCB layout. So with R1 and R7 in wrong could it be possible that REF 1 went bad also the same with REF 2 causing me to have low output?

Regards
Dave
Russ White  
#4 Posted : Thursday, November 9, 2006 8:23:52 AM(UTC)
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Dave Sans wrote:
Hello
Still having problems with low output gainBrick wall I check the FET’s they seem fine. I had to replace a few of them when I first put the preamp together because I installed R1, R2, R6, andR7 wrong I fixed that replaced the FET’s that bring to where I am now. I was reading the original thread on diyaudio.com looking at the PCB layout. So with R1 and R7 in wrong could it be possible that REF 1 went bad also the same with REF 2 causing me to have low output?

Regards
Dave


It is possible, what I would to is check the voltage on the output side of the REFs, it should be 10V.

Cheers!
Russ
Dave Sans  
#5 Posted : Thursday, November 9, 2006 9:52:07 AM(UTC)
Dave Sans

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Hi Russ
Help me here I am not an EE would the output side be the pin closest to the FET?
And if so is it from that pin to ground I would masure to see if there is 10v

Regards
Dave

Edited by user Thursday, November 9, 2006 9:54:48 AM(UTC)  | Reason: Not specified

Russ White  
#6 Posted : Thursday, November 9, 2006 10:07:23 AM(UTC)
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Dave Sans wrote:
Hi Russ
Help me here I am not an EE would the output side be the pin closest to the FET?
And if so is it from that pin to ground I would masure to see if there is 10v

Regards
Dave


Actually I did a terrible job describing it. You should check the positive pin. Which is the center pin.

The easiest way would be to check the pins of R10 and R11 which are closest to the FETs. The reference would be between those pins and ground.

Cheers!
Russ

Edited by user Thursday, November 9, 2006 10:08:32 AM(UTC)  | Reason: Not specified

Dave Sans  
#7 Posted : Friday, November 10, 2006 8:55:55 AM(UTC)
Dave Sans

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Ok Russ
I check R10 and R11 I didn't get a 10 volt reading the meter was all over the place


Dave
Russ White  
#8 Posted : Friday, November 10, 2006 8:58:24 AM(UTC)
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Dave Sans wrote:
Ok Russ
I check R10 and R11 I didn't get a 10 volt reading the meter was all over the place


Dave


Which end of R10, and R11 did you check, it should be the end toward the VREF.
Dave Sans  
#9 Posted : Friday, November 10, 2006 9:15:12 AM(UTC)
Dave Sans

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Yes thats the one
Russ White  
#10 Posted : Friday, November 10, 2006 9:17:54 AM(UTC)
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Dave Sans wrote:
Yes thats the one


OK and your reference was GND?
Dave Sans  
#11 Posted : Friday, November 10, 2006 9:57:15 AM(UTC)
Dave Sans

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Yes thats right I went from the resistor side closest to the FET the trace following to the center pin of REF1 I used the chassis as ground. I can recheck it tonight.

Dave
Russ White  
#12 Posted : Friday, November 10, 2006 10:15:32 AM(UTC)
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Dave Sans wrote:
Yes thats right I went from the resistor side closest to the FET the trace following to the center pin of REF1 I used the chassis as ground. I can recheck it tonight.

Dave


Well then, it sound like you don't have 10V from you VREFs, and that would be bad... Sorry.
Dave Sans  
#13 Posted : Friday, November 10, 2006 11:16:51 AM(UTC)
Dave Sans

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So Ref 1 and 2 would be bad? What about the zeners?I am go to pull it apart this weekend recheck the FETs and so on and see if I can get some where.

Thanks for your help
Dave
Russ White  
#14 Posted : Friday, November 10, 2006 11:20:52 AM(UTC)
Russ White

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Dave Sans wrote:
So Ref 1 and 2 would be bad? What about the zeners?I am go to pull it apart this weekend recheck the FETs and so on and see if I can get some where.

Thanks for your help
Dave


I am actually not sure how to check the zeners in place... But yes, it would appear from your discription that the voltage refs are dead.
Dave Sans  
#15 Posted : Friday, November 10, 2006 11:35:31 AM(UTC)
Dave Sans

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Well I am going to check and see if Mouser has them because digikey has that 25 doller min I will pull the zeners off the board and check them also.

Dave
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