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Old 31st May 2004, 01:28 PM   #1
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Default TDA1543 resistor i/v

experiment

sounds realy bad:
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Old 31st May 2004, 01:30 PM   #2
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sound better :
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Old 31st May 2004, 01:46 PM   #3
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you have to put something between vref and gnd

http://jwg.student.utwente.nl/fedde/images/nonoz3.gif
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Old 31st May 2004, 02:02 PM   #4
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Hereby a pdf of what's been discussed to death. It was explained excellent by Rbroer:
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Old 31st May 2004, 02:49 PM   #5
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"you have to put something between vref and gnd"

my datasheet say " R bias - optional " what should mean i dont need it it the shown config.
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Old 31st May 2004, 03:00 PM   #6
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I think it's optionnal with an opamp IV, not with a passive IV
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Old 31st May 2004, 03:55 PM   #7
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till, with passive I/V, it's very critical the value you use between Ref and ground.
You have to use a resistor there.
I always use a 2.2k trimmer and it's so critical that you can tune it by ear.
Sound goes away, hiss, comes back distorted and finally clear (in both directions this happens).
There's a sweet spot thats not wide.
In the end you can measure the trimmer and put a resistor of that value there.
Unfortunately, the position where it sounds best is not the one with lower DC.
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Old 31st May 2004, 04:11 PM   #8
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but there's no advantage in having a low DC, since you have a cap at the output
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Old 31st May 2004, 04:13 PM   #9
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Of course.
Better with no cap, but not here.
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Old 31st May 2004, 10:55 PM   #10
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I did the trimmer at Vref some time ago, and i ended up with very low resistance there.

The reason for this attempt was i wanted without the resistor, and i´m sure it will work without. (datasheet)

Following the information in posting above and the datasheet i would need to set the voltage with the divider to about 2,3V, and use 650R/760R resistors.
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