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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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DIY HiFi Forum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Re: DIY DAC posted by mamu on January 10, 2005 at 10:43:16:
Hi,> Any "glimmer" if Yeo's DAC will sound better than
> Scott Nixon's TDA1543 based one?Reasonably well implemented the TDA1545 will sound a little smoother and relaxed, but I am not sure how well the kit does.
BTW, with diodes from my "junk box" I measure around 0.65V at 50mA current, this suggests that 9 diodes are best suited, giving 5.85V +Vdd.
If we tap off the nominal 2/3 Vdd at the 5th diode (NOT the 6th) we get 3.25V as common voltage. We can swing 1.25V towards the ground and 1.6V towards +Vdd, pretty much as good as it gets.
Now we can swing 1.25V max and the worst case current is 2.2mA. Thus we would need around 1K2 I/V conversion resistance. It seems advisable to make the Reference resistor adjustable (at least intially) and to adjust it with a 'scope and a 0dbfs sinewave to give just no clipping with a 1K2 I/V resistor, a 22k multiturn trimmer should do.
One might consider experimenting with the exact settings for the I/V resistor a little more and seek the best compromise between dynamic range and clipping, but I suspect that 1K5 will be the absolute limit.
One would really have to build a DAC and test it to get this down to a "T".
Ciao T
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Follow Ups
- Re: DIY DAC - Thorsten 13:25:22 01/10/05 (1)
- Re: DIY DAC - mamu 22:37:27 01/10/05 (0)
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