[time-nuts] Switching regulator replacement for 7805

Adrian Godwin artgodwin at gmail.com
Sun Dec 4 15:39:11 EST 2016


At Farnell, they're listed under Power Supplies rather than Switching
Regulators (which is a subdivision of Semiconductors).

It makes sense since one is a board product and the other a chip, but when
the board product is a drop-in replacement for a TO220, less sense!


On Sun, Dec 4, 2016 at 7:44 PM, John Ackermann N8UR <jra at febo.com> wrote:

> 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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