I have a homebrew 35 amp 13.8 vdc power supply out in the garage…made it many
years ago with a home-brew lm317(?) 3 legged adjustable voltage regulator. I
have never like my regulator system…otherwise the power supply is very stout.
Anyone make a good regulator board for same?
On Jan 18, 2014, at 7:28 AM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:
> I've found a very few linear power supplies generate noise. However those
> that do I've found are largely due to deteriorating decoupling capacitors in
> the regulator circuit or due to a highly reactive load on the output.
> Typically the oscillation can be from a few Hz to over 100 KHz and equal in
> amplitude to the output voltage. Real nasty stuff.
>
> A well designed and manufactured power supply, be it linear or switcher, will
> not generate any objectionable noise. Any noise generated has been found to
> be several dB below the typical noise found on the HF bands and even VHF
> bands.
>
>
>
> 73
> Bob, K4TAX
>
>
>
>
>
>
> ----- Original Message ----- From: "Jim Brown" <k9yc@audiosystemsgroup.com>
> To: <tentec@contesting.com>
> Sent: Saturday, January 18, 2014 12:21 AM
> Subject: Re: [TenTec] On Switching Power Supplies
>
>
>> On 1/17/2014 3:44 PM, george fritkin wrote:
>>> linear power supplies can cause noise a very proven fact
>>
>> Perhaps you could tell us the mechanism. I can think of only two --
>> oscillation in a regulator circuit, and improper termination of ground
>> wiring. The latter has nothing to do with power supplies, and the former is
>> another engineering goof. .
>>
>> 73, Jim K9YC
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>
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