[Milsurplus] [ARC5] Cool New DC-DC Converter

[Dennis Monticelli]

Brian,

I think there is a misunderstanding.  I think Scott was only trying to
point out that the primary winding and mag core are shared by all secondary
loads.  You can only get so many VA out of a transformer before hitting the
limitations of primary winding resistance and/or core saturation.

Dennis AE6C

On Fri, Mar 16, 2018 at 2:42 AM, Brian <brianclarke01 at optusnet.com.au>
wrote:

> Hello Scott,
>
> Where did you get this idea that power supplies share their output loads?
> Doesn't apply to any SMPSU I know, nor to any rotary supplies either.
>
> 73 de Brian, VK2GCE.
>
> On Friday, March 16, 2018 1:35 AM, Scott claimed:
> Folks,
>
> Cold heaters take about twice as much as when warm. But, there's no B+
> drain then, so the supply can direct all its primary power capability to
> the heater circuit. Most of these are power limited at about 1.3 times the
> rating so:12V 3A is 36W + 60 mA x 520V = 25W makes a total power limit of
> 61W. If all that is directed to a 12V heater circuit, you could get 5A, or
> 10A for 6V. I'm not sure the 10A would actually work bu the 12V 5A ought to.
>
> Someone needs to buy one and see what it actually does.
>
> Happy glowing,
>
> Scott  Robinson
>
>
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