Valve Portable PSU.

[AlanBeckett]

Thanks Nick.
I was thinking of putting it in a tin box with some feedthroughs and chokes.

Alan

[Joe]

Sorry, Nick, I misunderstood. I thought you were talking about just the chip. Those Konstantin things do look worth having.

- Joe

[Yorkie]

Nick wrote:

...ones are pretty neat , e.g. http://www.ebay.co.uk/itm/Nixie-power-su...0831452311

And at under a tenner with free P&P from across the pond, look promising.

What about noise when powering radios rather than nixies - is that an issue Nick?

[Nick]

What about noise when powering radios rather than nixies - is that an issue Nick?

All boost SMPSs work by switching fairly reasonable currents (in the order of a few amps) at annoying frequencies - they generate noise on both the input & output, and the magnetics also contribute... The hard switching which is an inherent part of the design also generates harmonics...

In other words, SMPSs have many advantages, but also (in an audio/RF environment), significant disadvantages...

When using one of these devices I use a MuRata BNP002-03 on both input & output with the sections daisy-chained and with the whole lot built into an FR4 (or similar) screened box with feed-through connections... The reason I use the BNP002-03? I have a box of them Yes, they are nominally rated for 50V, however the dielectric is good to 300V and I've never had one fail (yet)...

Cheers

[Radio Fixer]

What an interesting thread this has been for me. Not that I use such supplies for portable sets being quite happy making a battery box for a string of PP3's and C or D cells for heaters. With alkaline batteries I find for occasional use they last for years. And of course for an inverter design an equivalent A hours 9V battery is needed anyway.

But Ronald Dekkers design is really a master class, a most generous design teach in, which I haven’t found time to study fully yet but I will. Thank you Ronald.

Moving on to the Nixie HV and the warnings on layout and from there to the clocks on the Kosbo site. I was very taken with these, and spent a lot of time ... If I was a lathe man I would be looking at making a design classic housing for a big Nixie or VTF.

Gary