What transformer for Lampucera DAC?

fastasulike · 3rd April 2011, 03:09 PM

Hi all,

Back to the Lampucera DAC again (old style).

I have just used the DAC for the first time and it all works fine in standard trim. I am using a 9-0-9 VAC transformer, but it would seem that a 12 VAC transformer is recommended.

Is there a problem using a 9V transformer, as the rectified voltage will be 12V anyway?

I am using the supplied power supply board that came with the DAC kit, but I was wondering if using a 12V transformer would give the voltage regulators too much to do. The DAC DC supplies appear to be 5v and 12V.

Any ideas?

Many thanks

wwenze · 3rd April 2011, 11:55 PM

9V * 1.414 (after rectification) = 12.726V Don't know type of diode used for rectification so not gonna add diode voltage drop, but still 0.726V of overhead is less than drop-out voltage of the regulator, so you get no regulation.

12VAC transformer for 12VDC regulated out sounds right.

fastasulike · 4th April 2011, 04:54 PM

No, true, but there is a 5V supply on the board also.

Trebla · 5th April 2011, 11:36 PM

Quote:

but I was wondering if using a 12V transformer would give the voltage regulators too much to do.

I have been using mine with 12v for two years.
No problems so far.

fastasulike · 6th April 2011, 02:38 PM

Would that be a 12-0-12V transformer? Would it be possible to perhaps use a 2x 0-12V transformer somehow?

3rd April 2011, 03:09 PM	#1
fastasulike diyAudio Member Join Date: Nov 2009	What transformer for Lampucera DAC? Hi all, Back to the Lampucera DAC again (old style). I have just used the DAC for the first time and it all works fine in standard trim. I am using a 9-0-9 VAC transformer, but it would seem that a 12 VAC transformer is recommended. Is there a problem using a 9V transformer, as the rectified voltage will be 12V anyway? I am using the supplied power supply board that came with the DAC kit, but I was wondering if using a 12V transformer would give the voltage regulators too much to do. The DAC DC supplies appear to be 5v and 12V. Any ideas? Many thanks

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3rd April 2011, 11:55 PM	#2
wwenze diyAudio Member Join Date: Mar 2008	9V * 1.414 (after rectification) = 12.726V Don't know type of diode used for rectification so not gonna add diode voltage drop, but still 0.726V of overhead is less than drop-out voltage of the regulator, so you get no regulation. 12VAC transformer for 12VDC regulated out sounds right.

4th April 2011, 04:54 PM	#3
fastasulike diyAudio Member Join Date: Nov 2009	No, true, but there is a 5V supply on the board also.

6th April 2011, 02:38 PM	#5
fastasulike diyAudio Member Join Date: Nov 2009	Would that be a 12-0-12V transformer? Would it be possible to perhaps use a 2x 0-12V transformer somehow?

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