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  • #10145
    Jean-Pierre Desrochers
    Forum Participant

    Hi everybody,
    I’m designing with toroids.. mostly for MF RF input and output transformers
    (500 Khz to 5 Mhz range) for RF power amplifiers.
    I am facing a problem though..
    Every single toroid transformer’s design examples
    I can find on the web are according to
    2 toroids suppliers: Amidon and Micrometals.
    These toroids seem to be available only from
    these own companies.. (minimum qty buy with shipping delays..)
    But I’d like to order from Digikey or Mouser
    because of their low minimum parts count / 1 day delivery time..
    The problem is when I try to figure out which
    type of toroids would be the best for these frequencies
    in their available toroids list.. ex Digikey here:
    I’m very confused on what type I should buy..
    They all seem to be made for frequencies higher than 30Mhz and more..
    From Amidon it looks like the T50-1 BLUE 500khz to 5Mhz would fit my needs.
    From Digikey or Mouser I cannot figure another
    brand / part number that would be equivalent..

    Does anybody have an easy way for me to figure out
    what parameters should be checked Al / Q / Freq self resonance.. etc..
    Then I could do some comparisons between Amidon/Micrometals
    and other easy to find/buy brands from again Digikey or Mouser because
    of their fast shipping time. ??


    John Greenland
    CVRS Member

    Have a look at There is all kinds of info there. And unless you do not want to order from our neighbour to the south, they can supply what you want.


    John G. VO1 CAT

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