[Milsurplus] Quieting A DC/DC Converter

[Ray Fantini]

Two points about this entire discussion. First you never have to worry about inverter noise with batteries, and second real men build 60 cycle transformer power supplies for there set top and non portable radios!

That being said I have to admit that over the past ten years or so have noticed a real war on sixty cycle AC transformer technology.

Its time for us all to step up and do like our fathers did and solder nine volt batteries together or brake our back and wallets on huge heavy sixty cycle transformers.


Ray F/KA3EKH




________________________________
From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> on behalf of Al Klase <ark at ar88.net>
Sent: Saturday, January 20, 2018 11:00 AM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Quieting A DC/DC Converter

Gang,

Are there "isolated" versions of these converters?  That would be helpful in radios like the BC-348 where the negative output of the dyno in above chassis ground.

I don't think isolation is possible with a buck or boost circuit topology, as your adding a voltage in series with the input..

Al

On 1/20/2018 12:28 AM, Peter Gottlieb wrote:
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<mailto: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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--
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/


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