A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 101 - diyAudio
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Old 1st February 2014, 10:15 AM   #1001
dwjames is offline dwjames  England
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As I understand, the LF80 and LF33 are the 8.0v and 3.3v standard regulators. I would imagine the new shunt regulators are to replace these. The 3 legs of the shunt reg will be input voltage, output voltage and gnd and will be the same layout as for a standard 3 leg 7805 reg. If you look at the standard surface mounted LF regulators, you'll see that they have 2 legs presumably for voltage in and out, then the body tag at the other end is also connected to gnd. Removal of the wima caps on the board is only because there are also caps doing the same job on the shunt reg.
Take that all with a pinch of salt as I haven't done it myself, yet, but that would be my guess. Hopefully enough to point you in the right direction?
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Old 1st February 2014, 10:38 AM   #1002
rfthon is offline rfthon  Netherlands
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I think you have to replace the regulators
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Old 1st February 2014, 11:05 AM   #1003
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These are the regs that I have , which I can't seem to differentiate
Click the image to open in full size.
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Old 1st February 2014, 11:11 AM   #1004
rfthon is offline rfthon  Netherlands
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The regulators are next to the capacitors on the board,what you are showing(in front) is the capacitors
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Old 1st February 2014, 11:25 AM   #1005
dwjames is offline dwjames  England
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Yes, those are not regs. Those are capacitors.
The regulators to replace are surface mount and will have come already attached to the board. Marked LF80 and LF33 it would seem.
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Old 1st February 2014, 11:51 AM   #1006
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Sovereign,

You need to look closely at my pictures in post 259.
I used the soldering points of the pink capacitors because they are easier to solder than the SMD soldering connections of the standard regulators.
And also because these caps need to be omitted when using the shunts, also the electrolytics downstream of the regulators need to be removed. Otherwise it will deminish the effect of the shunt regulators.

You need to remove the regulators from the board, they are the black IC's with code LF80 and LF33 That come soldered on the board.

Regards,
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Old 1st February 2014, 11:58 AM   #1007
rfthon is offline rfthon  Netherlands
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Default LF type

see picture
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File Type: jpg GE3DPAK05-40.jpg (5.1 KB, 500 views)
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Old 1st February 2014, 12:16 PM   #1008
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Ah , now I understand ! I thought I was loosing it there. Ill re start the dac build this afternoon. Thanks for your help
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Old 1st February 2014, 04:10 PM   #1009
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Supersurfer
From looking at this picture of your DAC http://www.diyaudio.com/forums/attac...t-img_5923.jpg
It looks like the Tent shunt lab shunt regs go into the holes of the pink caps and the third leg of the shunt reg is soldered to the place where the original regulator was, are you able to confirm as I'm struggling a wee bit , thanks
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Old 1st February 2014, 04:35 PM   #1010
rfthon is offline rfthon  Netherlands
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I have taken a part of the drawings of Doede, you can clearly see how the LF regulators are connected.
Look special for c12 and c16 they are connected to LF80 and LF33 to out and ground.
The tent labs reg. goes in place of the LF80 and LF33
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File Type: jpg LF connection.jpg (64.6 KB, 478 views)
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