Re: [Xylo-SDR] RFC - Powers

[KD5NWA <kd5nwa@cox.net>]

Looks quite useful to get started and experiment.

At 07:35 PM 1/15/2006, you wrote:

Cecil
 
Well for external, and for experimentation I was thinking something like this. Ya can?t beat the price.
 
 
http://www.mpja.com/productview.asp?product=15740+PS
 
I?m Googling an internal equivalent.
 
Eric
 

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From: xylo-sdr-bounces@lists.ae5k.us [ mailto:xylo-sdr-bounces@lists.ae5k.us] On Behalf Of KD5NWA
Sent: Sunday, January 15, 2006 7:36 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] RFC - Powers
 
Sorry I didn't address inside/outside for the power source. If the power requirements are modest, then an internal power supply is desirable from a wiring point. A small switcher specially when fed by +13.8V, with plenty of noise reducing techniques could live inside the box without major problems.

Also if the power requirements are modest then there is a second alternative, I have several wall warts that put out +5 volts at 5A, +-12 at 1.5A. These came from equipment that was trashed at work, so something similar should be available. This has the advantage of removing a source of electrical noise from the box, and a source of heat that can make the oscillators drift, while keeping it to one power cord into the box.

If you desire to have a HF amplifier in the box of modest power, there is little choice but to have an external power supply, the box is too small to handle a lot of heat.

At 04:03 PM 1/15/2006, you wrote:

SNIP

Cecil Bayona
KD5NWA
www.qrpradio.com

"I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ... "