[time-nuts] Switching regulator replacement for 7805

John Ackermann N8UR jra at febo.com
Sun Dec 4 14:39:44 EST 2016

Thanks for that pointer!  When I searched Digikey, I wasn't able to find 
anything that was in the 3-lead TO-220 case.  I will definitely check 
out the Murata units, as I suspect they perform better than this one.

On 12/04/2016 02:01 PM, Adrian Godwin wrote:
> Thanks for this. I've seen something similar from Murata :
> http://uk.farnell.com/murata-power-solutions/oki-78sr-5-1-5-w36-c/converter-dc-dc-1-o-p-7-5w-1-5a/dp/2102101
> 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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