[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.

John
----

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.
>
> John
> ----
> 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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