[Elecraft] Battery Charging with DC Power Supply

[Wes Stewart]

I have a travel trailer that had a switch-mode charger that was so noisy that it interfered with (analog) TV reception in my house, when the trailer was next to the house on shore power.  Needless to say, radio operation was problematic.

So I built an analog smart charger using an Astron RS-35M for the case, raw DC and the pass transistors and an A&A Engineering board using the uC3906 IC.  I used this for a time externally, since it wouldn't fit and wasn't rugged enough to occupy the space in the trailer.  I now have this in the shack keeping a 95AH AGM battery charged for emergency use.

I replaced the trailer charger with the Iota DLS-45 (40 years ago I worked with some of the founders of this company).  It isn't totally electrically quiet, but for a switcher it isn't too bad.  Not good enough to go in my shack though.

Wes  N7WS



--- On Mon, 6/8/09, HowardZ <HowardZ at howardz.com> wrote:

From: HowardZ <HowardZ at howardz.com>
Subject: Re: [Elecraft] Battery Charging with DC Power Supply
To: elecraft at mailman.qth.net
Date: Monday, June 8, 2009, 12:52 PM


http://www.eham.net/reviews/detail/4103

http://www.iotaengineering.com/iq.htm