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Old 27th February 2005, 11:23 AM   #1
ash_dac is offline ash_dac  United Kingdom
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Default 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.
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Old 25th March 2005, 10:19 PM   #2
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Default 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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Old 25th March 2005, 11:44 PM   #3
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That's it nammy. Just grab the thread right away from ash. Jeez.
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Old 26th March 2005, 12:42 AM   #4
paulb is offline paulb  Canada
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Default Re: Mains adaptor low current PSU

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.
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Old 26th March 2005, 08:02 AM   #5
ash_dac is offline ash_dac  United Kingdom
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Hi,

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

Regards,


Ashley
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Old 26th March 2005, 12:18 PM   #6
paulb is offline paulb  Canada
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If you're going with AC, take a look at power supply projects 5 and 5A at www.sound.au.com .
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