Ham Radio Homebrew Informations: Re: [HamBrewers] PC SMPS

Tuesday, June 7, 2011

Re: [HamBrewers] PC SMPS

⁯For 24 volts in series, their earthing must be isolated from each
other. Also modern ones needs extra loading if not used with PC.
:-)

However 24 can be have from single PC SMPS without any modifiction by
using +12 & -12 volt pins. Note -12 volt can handle much greater
ampre then recomded (study systametic they both same). Need not worry
auto shut down is there. Added extra capacitor & chokes for filtering
is an extra advantage.

Readily available multi port Laptop smps also comes up to 24 volt ratings.

Am also not an expert, just sharing some practical homebreawing experience.

73's VU3SXT⁮

On 07/06/2011, Hari <harigee@yahoo.com> wrote:
> Paddy
>
> To my best knowledge you will not be able to put them in series but you
> can definitely put them in parallel.
> For 24V it gets tricky as the diode needed is for around 200V and also
> the turns ratio changes, but once i have done that by removing the core and
> then rewinding it .
>
> 73
> Hari
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> --- On Tue, 6/7/11, padmanabhan cattamanchi <PEPINDIA@yahoo.com> wrote:
>
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> From: padmanabhan cattamanchi <PEPINDIA@yahoo.com>
> Subject: Re: [HamBrewers] PC SMPS
> To: HamBrewers@yahoogroups.com
> Date: Tuesday, June 7, 2011, 11:39 AM
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> Sounds a bit complicated. Is it possible to make 24v supply using two of
> them in series, I was told it cannot be done because of the floating
> outputs.
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> 73,s
> Paddy
> vu2pep
>
> --- On Mon, 6/6/11, Hari <harigee@yahoo.com> wrote:
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> From: Hari <harigee@yahoo.com>
> Subject: Re: [HamBrewers] PC SMPS
> To: HamBrewers@yahoogroups.com
> Date: Monday, June 6, 2011, 11:16 PM
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> Paddy,
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> This works ,
> I have used it as described and also made one of my own with the same
> configuration.the trick is to get the oldest one as possible so that they
> have the 494 chip.
> I later brought few for 50Rs each and then pulled out the required
> components and then made one of my own.
>
> 73
> Hari
>
> --- On Thu, 6/2/11, padmanabhan cattamanchi <PEPINDIA@yahoo.com> wrote:
>
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> From: padmanabhan cattamanchi <PEPINDIA@yahoo.com>
> Subject: Re: [HamBrewers] PC SMPS
> To: HamBrewers@yahoogroups.com
> Date: Thursday, June 2, 2011, 1:15 PM
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> http://www.g3src.org.uk/downloads/G4FDN-psu.pdf,___
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