[Elecraft] [K3] Smart Charger

[Julius Fazekas n2wn]

Cookie,

Is this a switcher or serious iron type PS? Looks like all the Jetstreams
may be switchers, but could be wrong.

I like my PS heavy, not me radio ;o)

73,
Julius


WILLIS COOKE-2 wrote:
> 
> You might take a look at the Jetstream JTPS35BCMA.  It includes volt and
> ammeters, connections for the rig plus low amp connections for accessories
> and a connection point for the battery.  The switch to battery is
> automatic when AC power is lost.  The artifacts are reasonable and
> liveable.  On the down side, the fan comes on with a 1 amp load and is
> noiser that I would like, but liveable.
>  Willis 'Cookie' Cooke 
> K5EWJ 
> 
> 
> 
> 
> ________________________________
> From: Wes Stewart <n7ws at yahoo.com>
> To: elecraft at mailman.qth.net; Julius Fazekas n2wn <phriendly1 at yahoo.com>
> Sent: Tue, January 5, 2010 1:22:47 PM
> Subject: Re: [Elecraft] [K3] Smart Charger
> 
> Julius, et. al,
> 
> My charger is actually a marriage of some commercial gear with a few
> tweaks.  The motivation for this was the absolutely horrible RFI from the
> switch-mode charger in my 5th wheel trailer.  It was so bad that when I
> had the trailer stored here at home the RFI would actually interfere with
> OTA TV, so you can imagine what it did to the ham bands.
> 
> Rather than reinventing the wheel, I used an Astron RS-35M for its case,
> metering, raw DC, heat sink and pass transistors.   Rather than building
> my own board, I married this to an A&A Engineering smart charger board,
> (http://www.a-aengineering.com/150PCAAppNotes.pdf) doing a little trickery
> to allow the use of a fixed current sense resistor while still having some
> adjustment of the max charge current.
> 
> The heart of this circuit is the UC3906 integrated circuit that is
> designed for just this purpose.
> (http://focus.ti.com/docs/prod/folders/print/uc3906.html)
> 
> I shopped the idea of an article about this to ARRL but they weren't
> interested, so I never completed any further documentation.
> 
> Wes  N7WS
> 
> 
> 
> --- On Tue, 1/5/10, Julius Fazekas n2wn <phriendly1 at yahoo.com> wrote:
> 
> From: Julius Fazekas n2wn <phriendly1 at yahoo.com>
> Subject: Re: [Elecraft] [K3]  New K3 User and New Ham
> To: elecraft at mailman.qth.net
> Date: Tuesday, January 5, 2010, 10:17 AM
> 
> 
> Wes,
> 
> Do share your 30A "smart charger". It's easy enough to find information
> for
> lower current chargers, but less so for something in this range.
> 
> cheers,
> Julius
> 
> 
>       
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>       
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> 


-----
Julius Fazekas
N2WN

Tennessee Contest Group
http://www.k4ro.net/tcg/index.html

Tennessee QSO Party
http://www.tnqp.org/

Elecraft K2/100 #4455
Elecraft K3/100 #366
Elecraft K3        #1875
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