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Transformer
Hi!
I have a delta-modulator card (Transmitter/receiver in one) for speech application. In the transmitter part there is a transformer (Shell core coil)..whose input (primary of the transformer) is labled with -- 300 to 34,00 HZ --- and -3.5dBr/600 ohm ... I want to know whats this rating? Does that mean that the microphone driving the transformer primary has a 600 ohm output impedance? Before the transformer primary, there is a resistive network like this: A---------470 ohm----- | | | | -3.5dBr/600 ohm 1.2K T/F primary | | B---------470 ohm-----| Now does this mean that the impedance b/w A and B points should be 600 ohms? If the impedance of T/F primary is so selectec that 470+470+Zt= 1.2K then total impedance b/w A and B should be 600 ohm (1.2K || 1.2K)...does this make sense? Can a driving microphone have 600 impedance? What is meant by -3.5dBr? Please help. rider |
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