[sdiy] best ways of portable +/- supply

[Harry Bissell]

Spice says its about 15V... assuming that the 13.5VAC was an RMS value.

The two linear regulators is an old cheap trick. I don't like it personally but
it looks like an old design and negative regulators might have been harder to get.

Terry says he used a negative regulator and it worked...

H^) harry


----- Original Message -----
From: Tim Parkhurst <tim.parkhurst at gmail.com>
To: Harry Bissell <harrybissell at wowway.com>
Cc: KA4HJH <ka4hjh at gmail.com>, synth-diy at dropmix.xs4all.nl
Sent: Tue, 12 Jun 2012 15:18:19 -0400 (EDT)
Subject: Re: [sdiy] best ways of portable +/- supply

On Tue, Jun 12, 2012 at 12:03 PM, Harry Bissell <harrybissell at wowway.com>wrote:

> The two caps charge on alternate half cycles, but in effect they each
> charge to the rectified
> line voltage and are then in 'series' more or less (minus a couple of
> diode drops). Its a voltage doubler.
>
> H^) harry
>


And so the regulators are fed ~17VDC? And we get a negative regulated
voltage by running the second regulator "upside down"?


Tim (and I end each sentence with a question?) Servo
---
"Sire, the church of God is an anvil that has worn out many hammers." -
H.L. Hastings

-- 
Harry Bissell & Nora Abdullah 4eva