[ARC5] [Milsurplus] Quieting A DC/DC Converter

[MICHAEL ST ANGELO]

The trick is finding surplus transformers. Does anyone know of any sources?


I haven't looked for surplus transformers for years and started looking for a good candidate for a 115VAC 400hz supply. I could not find any surplus sources. Could it be surplus went to the metal recyclers because of the high price of copper?


Mike N2MS

 

> On January 21, 2018 at 3:31 PM Peter Gottlieb wrote:
> 
> 
>     Probably better if you can find a surplus 400 Hz filament transformer with
>     center tap. Less iron.
> 
> 
>     On 1/21/2018 2:26 PM, Tom Lee wrote:
> 
>         > > Sorry if this has already been discussed, but making the controller go at
> >         800Hz isn't the big challenge - it's the magnetics. Core loss is proportional
> >         to frequency, so going from 50Hz to 800Hz means a 16x increase in core loss.
> >         Whether that's a problem or not depends on the numbers, but in any case, it
> >         needs to be taken into account.
> > 
> >         Tom
> >         --
> >         Prof. Thomas H. Lee
> >         Allen Bldg., CIS-205
> >         420 Via Palou Mall
> >         Stanford University
> >         Stanford, CA 94305-4070
> >         http://www-smirc.stanford.edu
> >         650-725-3383 (public fax; no confidential information, please)
> >         On 1/21/2018 11:08 AM, Tom B wrote:
> >         >
> >         >
> > 
> >             > > > Here is a link to a schematic using the IR2153.
> > >             http://danyk.cz/menic230_4_en.html
> > >             It looks pretty simple to change the frequency.
> > > 
> > >             Tom
> > > 
> > > 
> > > 
> > > 
> > >             On 1/21/2018 11:21 AM, David Stinson wrote:
> > >             >
> > > 
> > >                 > > > > Anyone have the link to the schematic?
> > > > 
> > > >                 *From:*arc5-bounces at mailman.qth mailto:*arc5-bounces at mailman.qth .net [mailto:arc5-bounces at mailman.qth mailto:arc5-bounces at mailman.qth .net]
> > > >                 *On Behalf Of *Bob kb8tq
> > > >                 *Sent:* Sunday, January 21, 2018 8:14 AM
> > > >                 *To:* J Mcvey
> > > >                 *Cc:* arc5 at mailman.qth mailto:arc5 at mailman.qth .net
> > > >                 *Subject:* Re: [ARC5] [Milsurplus] Quieting A DC/DC Converter
> > > > 
> > > >                 Hi
> > > > 
> > > >                 Here’s a guy with a schematic of the same thing running a 2153. I’d bet what
> > > >                 is on
> > > > 
> > > >                 the board is pretty close to what he shows.
> > > > 
> > > >                 Bob
> > > > 
> > > > 
> > > > 
> > > >                 On Jan 21, 2018, at 9:09 AM, J Mcvey via ARC5 <arc5 at mailman.qth mailto:arc5 at mailman.qth .net
> > > > 
> > > >                     > > > > > wrote:
> > > > > 
> > > > >                 > > > > By the spec sheet for the IR2153D, you absolutely can run it at 800 Hz.
> > > > 
> > > >                 Just change the R-C values accordingly.
> > > > 
> > > >                 On Sunday, January 21, 2018 1:19 AM, Peter Gottlieb <kb2vtl at gmail.com mailto:kb2vtl at gmail.com
> > > > 
> > > >                     > > > > > wrote:
> > > > > 
> > > > >                 > > > > Not sure what chip they use on the thing and how freq is set. Anyone have one
> > > >                 and can let us know what the 8 pin DIP is?
> > > > 
> > > > 
> > > >                 On 1/21/2018 12:50 AM, JOHN MCCARTY wrote:
> > > > 
> > > >                     > > > > > This is cool. My question is: can we up-scale the thing and make it run at
> > > > > 
> > > > >                 > > > > 800hz??
> > > >                 >
> > > > 
> > > >                     > > > > > 73
> > > > > 
> > > > >                     n9hrt
> > > > > 
> > > > >                 > > > > 
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