[sdiy] +/- 15v from a wall wart...

[Dave Magnuson]

 Hi Fred & Justin

You'll need 9VAC for bipolar 9VDC out, 12VAC for +/-12VDC and 15VAC for 
+/-15VDC.

The question is: Do you absolutely need +/-15V?   I've found 12VAC wall 
warts to be fairly common (in the US), and many synth circuits will run on a 
+/-12Vsupply.     Just a thought....

Dave



----- Original Message ----- 
From: <fredw at lmi.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, July 18, 2008 2:06 PM
Subject: Re: [sdiy] +/- 15v from a wall wart...


> http://www.musicfromouterspace.com/analogsynth/WALLWARTSUPPLY/WALLWARTSUPPLY.php
>
> Wall Wart Power Supply (+/9V to +/-15V)
>
> Uses a 9V AC (not DC) wall wart to produce +/1 15V.  It's a bare  board; 
> you need to populate it yourself.
>
> F.
>
> Quoting Justin Owen <juzowen at googlemail.com>:
>
>> Hey all,
>>
>> I'm looking for some cheap, simple ways of getting a +/-15 volt   supply 
>> from a wall wart for a small, portable unit I'm working on.
>>
>> Has anyone got any advice on the suitability of dual output DC-DC 
>> converters like these:
>>
>> http://www.rapidonline.com/Electrical-Power/Power-Supplies/DC-DC-Converter-ICs/1W-Dual-output-DC-to-DC-converters/72607
>>
>> Fluctuation from an unregulated DC adapter might be a problem -   guess I 
>> could back them up with 78XX Vregs?
>>
>> I know there's a few good schematics out there for supplies running   off 
>> an AC adapter - but so far I've not had much luck tracking down   a cheap 
>> 15-18v AC wall wart in the UK - any clues?
>>
>> Basically I really want to move up to some designs that require a 
>> bipolar supply - but I also need the units to be portable and   useable 
>> with easily accessible power supplies/adapters. Not   necessarily after a 
>> 'perfect' solution just yet - a reasonably   workable one would suffice 
>> for the time being.
>>
>> Thanks much.
>>
>> J
>>
>>
>>
>>
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