Input Output Transformer - What is Impedance?
Impedance is how easy a circuit conducts current when a voltage runs through it. Impedance is measured in ohms and provides a way to tell how much of the voltage introduced at one end will really make it to the other end. Impedance can be effected by such things as resistance, reactance, inductance, and capacitance. Transformer themselves do not have impedances, they have impedance ratios. The impedance specification of output transformers sometimes confuse many people. The transformer has no intrinsic impedance, it simply reflects impedances, modified by the square of the turn ratio, from one winding to another. Why their so much confusion stems from the fact that transformers can concurrently reflect two different impedances. One is the impedance of the driving source and the other is the impedance of the load, as seen from the primary.
As we stated above transformer transform impedances as a pure ratio. A example is a 4400 PP to 8 ohm transformer makes any load on its secondary look like it 550 times bigger to a tube at the primary. Power tubes have a power output that needs to be match. This is called the "sweet spots load" and it refers to where their do the best on, most power out, and other loads will get less power because the tube itself limits how much power it will transfer out.
Input Output Transformer - What is a Input Transformer
An input transformer is typically loaded by the input of an amplifier state and is driven by the balanced line. In a output transformer the primary must have a high impedance to the differential voltage between the lines. To accomplished this it requires more turns of smaller wire producing relatively higher resistance windings. A Faraday shield, connected to ground, is used to prevent common-mode voltage from primary to secondary. To maintain impedance balance of the input line, the capacitance of the primary to the Faraday shield must be uniformly distributed across the winding. The secondary load on these transformer must be carefully controlled because of the high impedances and relatively high leakage inductance. This generally means physically placing the input transformer as close as possible to the input amplifier stage.
We have just given you the basic overview of a input output transformers, for more information and for the different makes and models contact TEMCo. Their friendly and highly trained staff can assist you in all your questions and needs of an input output transformer. A family owned business for over 40 years their pride themselves in offering quality products backed by excellent customer service and the best warranties in the industry. For all your output transformer call TEMCo today and find out why so many people trust TEMCo for all their transformers needs.
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