TDA1543 X 4 NOS passive low pass filter I/V. Wow!!! - diyAudio
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Old 8th August 2015, 04:54 AM   #1
ridikas is offline ridikas  United States
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Default TDA1543 X 4 NOS passive low pass filter I/V. Wow!!!

This DAC looks insane! I'm curious to hear feedback if anyone has built anything similar.
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Old 8th August 2015, 06:19 AM   #2
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I'm not seeing much passive filtering there - just several caps to GND on the DAC outputs.

Can't quite understand why so many CM chokes on the secondary side - better economy of copper and core would be achieved by putting those on the primary side. Single inductors would replace CM chokes on the secondaries.
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Old 10th August 2015, 06:16 PM   #3
DF96 is offline DF96  England
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The Rref and I/V resistor values look wrong; that circuit has 390 and 680 respectively. For four TDA1543 in parallel from an 8V supply rail you need Rref between about 250 and 300R and I/V about 250 to 400R. See TDA1543 passive I/V resistors for my understanding of this. Use the wrong values and you get asymmetric peak clipping. The extra 'filter' resistors and caps may be a weak attempt to smooth away the resultant distortion.

Last edited by DF96; 10th August 2015 at 06:17 PM. Reason: shorten
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