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radio shack kit question on (other) transformer ("input" 4Kct2K)

Discussion in 'Misc Electronics' started by [email protected], Sep 10, 2013.

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  1. Guest

    A number of the radio shack science fair electronics learning kits (at least 150-1, 160-1, 200-1) and some other equivalents (at least of the 200-1) have a (second) transformer, (some) with the labels 4K on one leg of a center-tapped side and 2K on the other (not center-tapped) side. It also has thelabel "input transformer".

    Suggestions for a (hopefully inexpensive) reasonable match/replacement for this part, that is readily purchased somewhere greatly appreciated?

  2. Mark Zenier

    Mark Zenier Guest

    Last I checked, Mouser had a page of "subminature audio transformers" or
    something like that.

    The specs on these things are variable enough that something nearby will
    probably work (a factor of 2 or thereabouts). For a couple of different
    manufacturer's parts, the impedance (and turns ratio) matches, but, for
    the cheap guys, you'll find the actual inductance of the windings shows
    that they put the minimum amount of wire in there. Great leeway can be
    had with the minimum and maximum frequency response. (Lower inductance
    windings will end up with a higher value for the low frequency limit).
    They'll spec the frequency response, but usually don't spec the winding
    inductances (which can vary with the core material, and with a bunch of
    other nonlinear crap when in operation).

    So a good manufacturer's 1k ohm transfomer might be the same as a
    cheap guy's 2k transformer. these days, most of this stuff is some
    job shop in China, so "it's suck it and see" if you're buying a one off,

    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
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