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Re: [RFI] Any LM338 Regulator RFI?

To: rfi@contesting.com
Subject: Re: [RFI] Any LM338 Regulator RFI?
From: Tim Groat <tcgroat@mesanetworks.net>
Date: Tue, 10 Jan 2006 19:05:30 -0700
List-post: <mailto:rfi@contesting.com>
The LM338 is a linear regulator so it won't be a noise generator if it's 
stable. Use proper RF bypassing to prevent oscillation, taking care to keep 
the bypass cap leads leads short.

The same bypass caps will also help keep transmitter RF out of the 
regulator. I've had a power supply go out of regulation when transmitting 
because of RF pickup even at QRP power levels. Adding bypass caps on the 
power supply's input and output leads cured the problem.

--Tim (KR0U)

>kd4e <kd4e@verizon.net>:
>Should I be concerned about any RFI if I were to use a LM338 in a dc-dc 
>power supply?

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