I just got myself a bunch of diodes.. UF4007 UF4004 UF5408
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.)
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 ron