[time-nuts] Switching regulator replacement for 7805
John Ackermann N8UR
jra at febo.com
Sun Dec 4 14:44:31 EST 2016
And Digikey does stock the Murata part, for about $4.30. Why I couldn't
find it when searching their site for switching regulators, I don't know.
On 12/04/2016 02:39 PM, John Ackermann N8UR wrote:
> 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 :
>> 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
>>> 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,
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