Mains adaptor low current PSU

ash_dac · 27th February 2005, 11:23 AM

Hi,

Has anyone tried to build a low power powersupply using a
mobile phone mains adaptor or similar being fed into voltage regulators?

If so, any potential issues?

The two applications would be for a cdplayer XO (probably a Tent
clock eventually), and powering a TDA1543 dac built inside a cdplayer. They are both low current applications.

Regards,

Ash.

namnguyen2003 · 25th March 2005, 10:19 PM

Hi. Anyone here know what kind of transformer do I need to build electrstatic? can I use any kind of audio transformer or it need to be some specific one.

please email me at

nam.nguyen@mail.sprint.com

Thanks
Nam

Bill Fitzpatrick · 25th March 2005, 11:44 PM

That's it nammy. Just grab the thread right away from ash. Jeez.

paulb · 26th March 2005, 12:42 AM

Quote:

Originally posted by ash_dac
Has anyone tried to build a low power powersupply using a
mobile phone mains adaptor or similar being fed into voltage regulators?

Do you mean using a wall wart? Should work fine, unless it has a DC output and you need a +/- supply. You could generate the negative supply I suppose.
I am using one with an AC output, using two half-wave rectifiers to give me a +/- supply. Other than having to filter it well, no issues. It's running an LM1875 power amp.

ash_dac · 26th March 2005, 08:02 AM

Hi,

Think i might go for the ac route as you suggest.

Regards,

Ashley

paulb · 26th March 2005, 12:18 PM

If you're going with AC, take a look at power supply projects 5 and 5A at www.sound.au.com .

27th February 2005, 11:23 AM	#1
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Mains adaptor low current PSU Hi, Has anyone tried to build a low power powersupply using a mobile phone mains adaptor or similar being fed into voltage regulators? If so, any potential issues? The two applications would be for a cdplayer XO (probably a Tent clock eventually), and powering a TDA1543 dac built inside a cdplayer. They are both low current applications. Regards, Ash.

25th March 2005, 10:19 PM	#2
namnguyen2003 diyAudio Member Join Date: Mar 2005 Location: kansas	Need help on transformer... Hi. Anyone here know what kind of transformer do I need to build electrstatic? can I use any kind of audio transformer or it need to be some specific one. please email me at nam.nguyen@mail.sprint.com Thanks Nam

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25th March 2005, 11:44 PM	#3
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	That's it nammy. Just grab the thread right away from ash. Jeez.

26th March 2005, 08:02 AM	#5
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Hi, Think i might go for the ac route as you suggest. Regards, Ashley

26th March 2005, 12:18 PM	#6
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	If you're going with AC, take a look at power supply projects 5 and 5A at www.sound.au.com .