[Elecraft] Power Supply?

[Ron D'Eau Claire]

I have an Astron 20M and IIRC the transformer alone is bigger than the P3
enclosure. And then there's the big finned heat sink hanging on the back
(the reason it doesn't need a fan). If you can squeeze the transformer in
the enclosure and find somewhere to mount the regulator circuit, the heat
sink might fit on the top of the P3, giving it a sort of "Jurassic" look :-)

But there's another important issue beyond size - the magnetic field. Linear
supplies are electrically quiet but very *noisy*, magnetically. The strong
60 Hz magnetic field can wreak havoc in many nearby devices and circuits.
Extensive magnetic shielding is normally employed when a large transformer
in near sensitive circuits - normally very heavy and bulky for larger
transformers and still not completely effective. 

Ron AC7AC


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Andrew Moore
Sent: Saturday, July 02, 2011 3:19 PM
To: Phil Hystad
Cc: Elecraft
Subject: Re: [Elecraft] Power Supply?

phil> Isn't the RS-20M a linear power supply?

Correct, linear.  Again I'm not sure if it can be crammed into a P3
enclosure, but come Friday, I'll know :)

I too despise noisy fans.  I'd pick one carefully!

--Andrew, NV1B
..
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