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

[David Stinson]

Majority of these boards, the negative input and negative output are connected, so “nonisolated.”  Isolated boards are less common; you have to watch for them.  I have some “Isolated” that input 9-48 V and output +/- 15V, meaning three connections: +15, Common and -15.  You can ignore the common and connect them as you would an isolated 30-Volt battery.  I have series them as high 180 V (even higher for short tests) and run them without problems, given one must filter well and put them in a shielded box (not all- I have some that put out few birdies).  

One real caution:  This ain’t a 6X5 in a Zenith.  Many of these bricks will source AMPS at high voltage. 

 Treat them with respect or your friends might be giving YOU their respects.

73 Dave AB5S



 


Subject: Re: [Milsurplus] Quieting A DC/DC Converter

 

The one I saw said it was non-isolated so not that one. You will need isolated ones to do that. 

 

Peter


On Jan 20, 2018, at 12:10 AM, Tom <noflood1 at sonic.net> wrote:

  I'm wondering if for a BC-654 could you take two of these, set the outputs to 250 violts and then wire in series for 500 volts?? 

 

                                      Tom W6TOM

 

 

On 2018-01-19 13:45, Military Wireless Museum via Milsurplus wrote:

On 14 Jan 2018 at 16:35, David Stinson wrote:

> Here's a listing for these DC-DC thingies. It's
> 390 VDC max.
> 
> https://www.ebay.com/itm/142555893852

Hmmmm....looks very interesting. I see several other such models by different folks on 
eBay.

Has anyone tried these yet?

Ken W7EKB

---

I've bought some of these and two other types, a 180v and 480v max output types. I have the one above powering my ARB set to 240v dc and it runs cold but it will need putting in a screened box etc before fitting in place of the dyno.  

 

The 480v unit gives 96ma into 5k so should drive a tx even. 

 

Ben. 

 

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