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21st December 2011, 03:15 PM
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#1301 |
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diyAudio Member
Join Date: Sep 2010
Location: LONDON
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I have -6.37 @ the test pin . It will not move . All parts were tested and P1 was removed and checked ..... V @ Q4 & Q5 gates are stable in the 30mV range .
Is the fact that I'm using the 2.2k @ Q2 the problem ... ? I only have 3 ZVP so I want to be sure as I can be before I plug it in . Rich |
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21st December 2011, 03:42 PM
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#1303 |
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diyAudio Member
Join Date: Sep 2010
Location: LONDON
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yep this is the second board !
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21st December 2011, 04:38 PM
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#1304 |
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diyAudio Member
Join Date: Apr 2002
Location: near the sea
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With the 2K2 resistor you are indeed unable to modulate DC offset to your needs. Because resistor has only 2 pins and no gate (command) pin
 Try the ZVP in. I have some spares that I could send to you, in case you run out of stock  Best, nAr
__________________
"... Audio needs the thinnest wire ..." Rowan McCombe  ... I hear it !!!"Just 'cause they can't hear or sense it themselves doesn't mean you can't !" Allen Wright Allen was right ...
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21st December 2011, 06:58 PM
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#1305 |
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diyAudio Member
Join Date: Sep 2010
Location: LONDON
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I have a problem with the Voltage @U1 ....- 1.5 VDC .... I think the reg is gone ... R1 reads as it should , but no V on the out ...?
R |
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21st December 2011, 10:51 PM
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#1306 |
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diyAudio Member
Join Date: Sep 2010
Location: LONDON
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I changed to + Reg and its working ,but now I'm showing 23.55 V @P1 test pin with no adjustment working .... I'm trying to use the other board V's to check this board ...
Here we go again ! 3 V drop across R6 , |
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22nd December 2011, 01:26 AM
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#1307 |
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diyAudio Member
Join Date: Feb 2004
Location: Ottawa
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Check around Q11 or Q11 itself. It is its job to bring down voltage on test point P1.
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22nd December 2011, 07:23 PM
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#1309 | |
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diyAudio Member
Join Date: Sep 2010
Location: LONDON
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Quote:
changed Q11 and no change S= 23.76 G= 22.36 D= 22.85 I think its somewhere else ...  Hi 6 , I have a fully working board ... just one to go ! |
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22nd December 2011, 10:00 PM
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#1310 |
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diyAudio Member
Join Date: Oct 2010
Location: Denver, Colorado
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That's fantastic! What did you do? Especially to get rid of the DC offset on the output??
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