15 V dual rail psu

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15 V dual rail psu

Postby jkhuri44 » Sat Aug 27, 2016 6:31 pm

hey guys,

i've got my eyes on a DIY project which requires to be powered by a dual rail PSU.
Just wondering if it is possible to buy a wall wart, or similar externnal PSU, affordably with dual rails...i see computer PSU's can come with dual rails, but not so sure it's suitable for this purpose.
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Re: 15 V dual rail psu

Postby stosostu » Sat Aug 27, 2016 7:28 pm

I'm not aware of any dual rail wall wart PSUs, but Jaycar have a range of dual rail PSUs in various voltages and power ranges that would, no doubt, do the job.
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Re: 15 V dual rail psu

Postby jkhuri44 » Sat Aug 27, 2016 8:45 pm

Hi Bob,

All i could find was this:
http://www.jaycar.com.au/powertech-swit ... t/p/MP3180

is a switch mode psu actually suitable for audio applications?
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Re: 15 V dual rail psu

Postby chrisp » Sun Aug 28, 2016 10:43 am

Check out Joe Malone's range at http://www.jlmaudio.com/shop/power-supply-kits.html

Top of the list you'll find a +/-16V supply that also provides a 48V for phantom power. There are a range of other supply kits to suit almost every need.

Bear in mind that without a centre tapped transformer, making a +/- supply from a wall wart provides a reference ground rather than an earth. Suppose you get a 24V DC wall wart - a couple of 100K resistors and 12V zener diodes are all you need to create a half volts supply rail, add in some bypass caps as needed. Call this half volts rail 0V and then the wall wart positive is +12V and the wall wart negative is -12V. Lo and behold, dual supply!

The danger is forgetting that the 0V in this arrangement is actually at 12V to the rest of the world - it is NOT earthed - so you do NOT connect it to your case, for example, and you need to have a transformer or other scheme to send any signal out into the real world.
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Re: 15 V dual rail psu

Postby jkhuri44 » Sun Aug 28, 2016 11:05 am

thanks for chiming in chris and bob :) chris, i just noticed ur in canberra now?

so, basically, a ready made dual rail psu siutable for audio doesnt exist im gathering...
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Re: 15 V dual rail psu

Postby chrisp » Sun Aug 28, 2016 1:34 pm

Hey Jamil

Yeah, moved to CBR 3 years ago - still listen to Mandala every now and then.

The JLM unit at the link I posted is ready made.
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Re: 15 V dual rail psu

Postby jkhuri44 » Sun Aug 28, 2016 1:37 pm

ah sorry chris, i thought it was a kit to build.
cool thanks again :)
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Re: 15 V dual rail psu

Postby zenelectro » Sat Sep 17, 2016 2:16 pm

jkhuri44 wrote:thanks for chiming in chris and bob :) chris, i just noticed ur in canberra now?

so, basically, a ready made dual rail psu siutable for audio doesnt exist im gathering...


From memory JLM audio has some great dual rail PS kit PCB's and even transformers. Check Joe's website

http://www.jlmaudio.com/shop/power-supply-kits.html

cheers
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