[sdiy] best ways of portable +/- supply

[Harry Bissell]

 I was going to say WTF until I saw there are two POSITIVE regulators...

essentially a capacitive doubler power supply with post-regulation.

Clever !

H^) harry

----- Original Message -----
From: KA4HJH <ka4hjh at gmail.com>
To: synth-diy at dropmix.xs4all.nl
Sent: Tue, 12 Jun 2012 13:56:24 -0400 (EDT)
Subject: Re: [sdiy] best ways of portable +/- supply

>does anyone have opinions on the best way to get plus and minus rails into
>a portable synth/noisenaker/stompbox type project  WITHOUT using an on
>board transformer?
>
>
>the options I know of are
>
>1.AC to DC conversion (ac wallwart plugs in and is converted with
>regulators and caps to a DC dual supply.  Kind of bulky due to use of
>large caps.

Here is a little known way to get a FWR bipolar supply from a *single* AC
source:

<http://s1115.photobucket.com/albums/k541/MacDoktor/SDIY/?action=view&current=FWR-single-AC-supply.jpg>

I posted this once before about ten years ago. I've used it myself and it
does work.

-- 

Terry Bowman, KA4HJH
"The Mac Doctor"
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-- 
Harry Bissell & Nora Abdullah 4eva