[time-nuts] Switching regulator replacement for 7805

[John Ackermann N8UR]

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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