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Re: 600:600 versus 10k:10k

Posted by Thorsten (M) on June 17, 2005 at 05:48:46

In Reply to: 600:600 versus 10k:10k posted by Bas Horneman on June 17, 2005 at 05:28:48:

Hi,

> So why and where would a 600:600 ohm transformer be used...
> rather than say a 10k:10k?

Usually (but not allways) the 600:600R Transformer will be intended as output transformer, to be driven by a suitably beefy solid state stage (I find a Video Op-Amp like the AD811 or LM6181 to be a good choice, followed by a suitable 51 Ohm build out resistor). So you will be able to use single ended high current circuitry and still drive a 600 Ohm load balanced, galvanically insulated to around +20dbu. Bifilar wound 600:600R output transformers tend to have prodigous level handling due to huge cores, low losses and frequency responses into the MHz range (no typo) due to relatively few turns.

Usually the 10k:10k transformer will be a "line briding" (in other words it does not materially load a 600 Ohm Load) line input transformers, designed to be loaded by 10K and usually have high level handling usually by having many turns and usually smallish cores.

It is quite possible to make a "universal" 10K:10K Transformer which performs admirably as "600R" output transformer and which when driven by a suitably low impedance source will drive 600 Ohm fine and with wide bandwidth and which will shine equally as 10K input transformer, but such a device must be huge and expensive (at least the single one I am aware of is).

By trageting the transformer narrowly at a given application better economics tend to accrue.

Ciao T

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