Jim

It has been awhile, but I put it inside a tight aluminum can with 0.01 feed thru caps in and out. The can looks like an IF transformer and is well shielded. In addition I had to wrap input and output wires with low frequency ferrite cores. I think it was 75  material, which is a low frequency core. 31 would also work well I think. I had to put a lot of stuff in there to limit the energy.  The Chinese switchers are terrible for RFI.

Dave K1WHS

Interesting, did putting the converter in a metal can clean up the hash?  What type of ferrite bead and feedthrough cap did you use?

I've been thinking along the same lines, putting the converter in a decent metal box to simulate a dynamotor and use the same mount in an ARR-15.

Regards,

Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy

-----Original Message-----
From: David Olean <[email protected]>
To: David Stinson <[email protected]>; [email protected] <[email protected]>
Cc: ARC-5 <[email protected]>
Sent: Wed, Oct 26, 2022 10:18 am
Subject: Re: [Milsurplus] BC-312

I tried a similar DC -DC converter from China on my RA-10 receiver. I
located it inside the radio and found that I had to shield the bejeesus
out of it to keep the digital hash from the receiver input! It ended up
inside a metal can with bypassing and ferrites all over it.  My unit was
quite noisy. It is especially troubling when your receiver covers the
long wave frequencies. Mine ran at 210 volts DC with a 28 VDC primary
input. Be prepared to shield it in the radio.

Dave K1WHS

On 10/26/2022 8:07 AM, David Stinson wrote:
> I've ordered a couple of these to try:
> https://www.amazon.com/dp/B08SLFSRL6
> Claimed to source 100mA at 100-230VDC
> with 4-15V input.
>
> I've powered some small receivers with some
> of the older High-Voltage inverters. The
> "Yellow ones" have some birdies and they
> top-out at about 45mA- enough to run
> an ARC-5 at low B+.
>
> We'll see how noisy is this new one.
>
> GL OM ES 73 DE Dave AB5S
>
> P.S.  Another interesting one:
> https://www.amazon.com/dp/B0992GCCSK
> If you have a small receiver or QRP
> transmitter that sips no more than 40mA,
> this one has a filament voltage regulator
> and will do HV 150-420V.  Has feedback indicating
> that the MOSFET  (IRF840) is a bad Chinese knock0ff
> which can die early (no heat sink compound)
> and if you replace it with a known-quality FET,
> it will then work for you.
>
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