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Old 25th February 2004, 08:17 PM   #11
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Ups!
I just realized that the schematic is not correct..... bad design..... Sorry
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Old 25th February 2004, 08:24 PM   #12
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I just realized that the schematic is wrong. The current that is flowing through the 2k2 resistor is transformed into 3,5V. And I have 3,5V at the cathode of the tube so I must remove 2k2 (and 50k as well) resistor and add the current from the TDA1543 pins 6 and 8 to the current of the cathode resistor and then calculate my resistance of the cathode resistor.
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