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

[Peter Gottlieb]

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.net [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.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.net 
>>> <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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>
>
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