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 1N vs UF diodes
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Average Member

223 Posts

Posted - December 26 2016 :  03:39:18  Show Profile Send Luciano a Private Message  Reply with Quote
Hi everybody
and Merry christmas!

I just got myself a bunch of diodes..

UF standing for Ultra Fast.

I read somewhere they were much better as the 1N ones..
I replaced them in some ciruits I had specially the 1N4007 and 1N5408.
I did measurements before and after.. and guess what..
Absolutely NO difference.

So i guess i can stick to the 1N models for my pulse motors.

Unless i am missing something... (that would be my question)

especially that some companies charge like 10x the price for the UF models.
(actually i finally found a discounter that charges same price for both, like around 6cents each.. so i bought 100 of each.. ~ 18$ which is OK.)


Edited by - Luciano on December 26 2016 03:42:27

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Mountain View


United Kingdom
1052 Posts

Posted - December 29 2016 :  17:47:39  Show Profile Send ron_o a Private Message  Reply with Quote
Hi Luc
Your observations are correct and this is why
A standard 1N400X series rectifier will easily cope
with the switching rate of a standard pulse motor
When used to rectify 50Hz mains it copes with 100 pulses
per second which would be equivalent to 6000 pulses per
minute ( i.e. 6000 rpm )
So really I would expect little difference in performance
even at 20000 rpm
Ultra fast rectifiers have there place , swiitch mode power supplies
for example
Hope that helps
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Average Member

223 Posts

Posted - December 29 2016 :  22:15:22  Show Profile Send Luciano a Private Message  Reply with Quote
Thanks so much for the info
well i was turning at 3000 rpm but with 8 magnets.. so that would be, unless i'm wrong, 400Hz

well i got the diodes because i got myself the last peter lindemann video, where he says he got much better performance with the UF versions of the diodes.

(actually the video is only worth the money if you think like me you are missing something)

because i got exactly (i really mean exactly!) the same performance than with the other diodes.


Edited by - Luciano on December 29 2016 22:19:24
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New Member

New Zealand
17 Posts

Posted - January 10 2017 :  15:33:32  Show Profile Send massive a Private Message  Reply with Quote
you have to be aware there are knock offs on ebay etc . RS components has reasonable prices some times the cheapest! 80)
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