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!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990
!!! Xmos Problem !!!  Dual AK4495S AK4495SEQ AK4118 DAC decoder XMOS USB w/LME49990
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Old 10th November 2017, 04:15 PM   #51
androa76 is offline androa76  Slovenia
diyAudio Member
 
Join Date: Mar 2007
Location: Maribor
What have you done with green?
Maybe colour code is not right ... disconnect primary and measure resistance from red to green and from black to green... sum from red to black must be equal as from black to green and green to red. Maybe they have mixed and you have 115v connection.
Jrc is producer like Texas instruments and Phillips...they all produce NE5534.
You get this opamp in all local electronic shop for almost nothing no need to wait for ebay delivery.
ne5534 - Search Results | Farnell UK
First you must solve right voltages on all pins.
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Old 10th November 2017, 05:42 PM   #52
MykhailoM is offline MykhailoM  United Kingdom
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Join Date: Mar 2012
Location: London, SW16 6BA
Hi,

The green is left unconnected and isolated. The resistance (Green 115v -- Red 230v)(on multimeter set to 200Ohm)
a) red to green 87.2
b) black to green 45.4
I have another transformer I have (115v Orange --230v Red) the readings:
a). red to orange 83.7
b).black to orange 43.0

Last edited by MykhailoM; 10th November 2017 at 05:56 PM.
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Old 10th November 2017, 06:00 PM   #53
androa76 is offline androa76  Slovenia
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Join Date: Mar 2007
Location: Maribor
In that case red and green are right wires and black is middle insulated wire.
China i got often problems with boards ...
1.disconnect secondaries from dac board except for audio part (yellow and brown)
2.connect green to neutral red to phase ... black isolated
3.measure DC on 2 big capacitors where you measure 50V DC
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Old 10th November 2017, 06:16 PM   #54
MykhailoM is offline MykhailoM  United Kingdom
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Join Date: Mar 2012
Location: London, SW16 6BA
Here is the picture of connection (Black is ground and disconnected / isolated) Shared album - Mykhailo M - Google Photos
Should I turn in on to measure?
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Old 10th November 2017, 06:25 PM   #55
androa76 is offline androa76  Slovenia
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Join Date: Mar 2007
Location: Maribor
First measure resistance from black to red if it is 45 then Yes turn on if you hear buzz in transformer then turn off...if no then measure dc on big caps. If it is 25V DC then measure dc in DIL8 pins 4 an 7.
Write (-) if it is negative dc.
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Old 10th November 2017, 06:31 PM   #56
MykhailoM is offline MykhailoM  United Kingdom
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Join Date: Mar 2012
Location: London, SW16 6BA
the resistance between black and red is 121.4ohm
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Old 10th November 2017, 06:36 PM   #57
androa76 is offline androa76  Slovenia
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Join Date: Mar 2007
Location: Maribor
121 is sum and your earlier connection is ok. Hmm than unplug and measure resistance between 2 yellow and 2 brown. resistance from yellow to brown must be 0.
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Old 10th November 2017, 06:38 PM   #58
androa76 is offline androa76  Slovenia
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Please write on my mail... it will be easier.
androa76@hotmail.com
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Old 10th November 2017, 06:42 PM   #59
MykhailoM is offline MykhailoM  United Kingdom
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Join Date: Mar 2012
Location: London, SW16 6BA
yellow to yellow 05.2
brown to brown 0.5.2
yellow to brown 0
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