[ARC5] Switching DC-DC Power Supplies

[Tim]

Hi Guys...you might want to try this some time.  I got hold of a
mickey-mouse 12 VDC - 125 VAC, 75 watt "inverter" from Radio Shack awhile
ago.  Essentially similar to this one:
http://www.radioshack.com/radioshack-75w-power-inverter-with-usb/2200083.html
It used F1010E FET's in the oscillator....

I lashed up 4 diodes in a FWB, added a filter cap and a bleeder, Presto -
125 VDC.  Did not take a lot of C to filter it but the breadboarded
contraption did radiate a lot of HF switching noise.  I tried it as an
experiment to power the receiver in a Collins 618F-1A VHF aircraft
transceiver.  Worked fine... Improvise, adapt, overcome....

Taking the PCB out of it and making some sort of a shielded enclosure, it
may work fine to power an HF receiver at that voltage level.  And it's
pretty cheap...

"If it's stupid, but works, it isn't stupid"
Murphys Laws of Combat....

73, Tim
N6CC

On Thu, Oct 15, 2015 at 9:31 AM, J Mcvey via ARC5 <arc5 at mailman.qth.net>
wrote:

> Probably true in most cases, but the chip on my converter has four Chinese
> characters but no numbers at all!I was very surprised to see that.
>
>
>
>      On Thursday, October 15, 2015 12:14 PM, "mstangelo at comcast.net" <
> mstangelo at comcast.net> wrote:
>
>
>  The Chinese ones are usually based on a typical application of the IC
> chip manufacturer.
>
> Find out which IC is used and look at the data an dapplication sheets.
>
> Mike N2MS
>
> ----- Original Message -----
> From: Robert Eleazer <releazer at earthlink.net>
> To: arc5 at mailman.qth.net
> Sent: Thu, 15 Oct 2015 13:30:12 -0000 (UTC)
> Subject: [ARC5] Switching DC-DC Power Supplies
>
> By the way, does anyone have any idea how to get inside some of the 12VDC
> to 125VAC off-the shelf inverters and change the output voltage to
> something a bit lower?
>
> Wayne
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