[time-nuts] Switching regulator replacement for 7805

Adrian Godwin artgodwin at gmail.com
Sun Dec 4 14:01:30 EST 2016

Thanks for this. I've seen something similar from Murata :


Since they're a mainstream supplier of inductors they may have managed
better performance - it would be interesting to compare.

On Sun, Dec 4, 2016 at 6:50 PM, John Ackermann N8UR <jra at febo.com> wrote:

> I found a cute little switching regulator that's a drop-in replacement for
> an LM7805: http://www.ebay.com/itm/261243604047
> I got a couple to play with, mainly to see how bad the noise would be.
> Here are spectrum analyzer and PN shots comparing a cheap surplus OCXO when
> driven by a regular 7805 and by the switching replacement.
> The switching frequency is supposed to be 2 MHz but you can see that it's
> more like 2.4 MHz.  Whether this performance is sufficient for any
> application is up to you.  It sure runs a lot cooler than a 7805, though!
> John
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