[ARC5] Chinese switching converters

[J Mcvey]

My device appears to be an isolated switcher, not a boost regulator. There is no continuity between LV - and HV - . The waveform on one of the drains looks like a semi-resonant PWM type. I adjusted it to 240V and hooked it up to my ARC5 SCR274 beacon radio running on 24 volts. Works OK but there are definitely birdie issues on some frequencies. I don't think it's so much due to dirty DC, but perhaps just radiation from the switcher  being picked up by the radio. Shielded cable right up to the antenna post helped while hooked up to my 160M dipole. If I just draped a wire in the room, the problem was much worse. 
An AM station at 550 KHZ sounded fine.
For my next trick, I will wrap the SMPS in tin foil and ground it to the case and see if that will solve the problem.
 


     On Sunday, October 11, 2015 10:21 AM, David Stinson <arc5 at ix.netcom.com> wrote:
   

 To the many people smarter than me:

If you go to Ebay and search "Nixie power," you get 
over a hundred hits and several different designs.

Voltages and currents are obvious concerns, 
but is there a way to tell which will produce fewer "birdies?"
I use the smaller boost and buck converters for lots of
projects with only minor "birdie" issues, but these HV
switchers might be a "different animal."

How would you go about picking one for a BA project?


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