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Re: Interstages with very high inductance

Posted by mqracing (M) on April 1, 2007 at 19:56:10

In Reply to: Re: Interstages with very high inductance posted by SomeJoe on April 1, 2007 at 11:47:37:

Hi Joris:

High impedance tranney designs are trickier to design and balance the requirements of having a good bottom end along with good extension on the top. But not impossible. In the archives, as just one example, is a line output trans designed by Peerless with a 30K nominal primary impedance--- whose bandwidth (if you evaluate success on this parameter) is listed as 5Hz to 65khz plus or minus 1 db. As a funny aside--- this particular trans was designed for and sold to the Fort Wayne Steel mill. Don't ask me for what--- I have no clue.

As a general note on the costs of these small signal specialty tranneys.... extremely costly is itself a relative term--- that said--- frequently the cost of housing the unit (in multiple mu metal cans, sometimes with copper shading rings btwn the cans) was a large contributor to the final end cost of the product. If you application does not require this sheilding the relative costs become more manageable--- though your still often looking at some of the most expensive lamination materials (high mu lams) available--- so that you can get a walloping amount of L from a relatively small core area with relatively few turns--- all of which helps in getting a well balanced design with good bottom end capabilities along with good extension on the top end (high freq response).

In advance, we are not currently offering any small signal tranneys with pri impedances much above the 15K range.

best of with your project,

MSL

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