Hello,
Can you give me good arguments for using a specific value for such a resistor? The most common in between 270 and 380 ohm, but you can also find values like 25ohm and 900ohm. I.like to use it with 1:2 or 2:1 transformer (digital-analog board).
Currentaly I'm using 2:1 trnasformer with 550 or 380ohm resistor. I prefer the sound of 550ohm, but I faced the very strong pressure for advocates of using very small resistor with a huge step-up transformer (like 1:18). The chip linearity is the most common argument here. At the same time I here about the problems with chip heat dissiparion of such a configuration and a problem with chip current source efficiency. For me lowering the resistor value gives the hard sound. Any comments will be appraciated.
Regards
Maciek
Can you give me good arguments for using a specific value for such a resistor? The most common in between 270 and 380 ohm, but you can also find values like 25ohm and 900ohm. I.like to use it with 1:2 or 2:1 transformer (digital-analog board).
Currentaly I'm using 2:1 trnasformer with 550 or 380ohm resistor. I prefer the sound of 550ohm, but I faced the very strong pressure for advocates of using very small resistor with a huge step-up transformer (like 1:18). The chip linearity is the most common argument here. At the same time I here about the problems with chip heat dissiparion of such a configuration and a problem with chip current source efficiency. For me lowering the resistor value gives the hard sound. Any comments will be appraciated.
Regards
Maciek
Salut
I've built a DAC (differential in my case) using this chip. It differs from the more usual current o/p DACs in that the o/p impedence is given at 1k7 - so up to 1k should be OK and my first proto had just that - a 1k I/V resistor. You'll find that you can easily hear the difference between a good and bad resistor here - I didn't really believe that one could hear the difference between resistors before.
BTW with the +/-1mA current output you'll theoretically get a +/-1V peak to peak o/p.
@+
Vernon
I've built a DAC (differential in my case) using this chip. It differs from the more usual current o/p DACs in that the o/p impedence is given at 1k7 - so up to 1k should be OK and my first proto had just that - a 1k I/V resistor. You'll find that you can easily hear the difference between a good and bad resistor here - I didn't really believe that one could hear the difference between resistors before.
BTW with the +/-1mA current output you'll theoretically get a +/-1V peak to peak o/p.
@+
Vernon
Hi!
I was onced in Lyon going to Le Trois Vallees🙂 Nice place!
Do you think, that using I/V resistor as a shunt to primary windings of transformer changing the thinking of a proper value of I/V resistors? For sure, the primary inductance should be adjusted to this value, but in general which approach looks better? Small resistor-step-up transformer or big resistor and 1:1 ratio?
I was onced in Lyon going to Le Trois Vallees🙂 Nice place!
Do you think, that using I/V resistor as a shunt to primary windings of transformer changing the thinking of a proper value of I/V resistors? For sure, the primary inductance should be adjusted to this value, but in general which approach looks better? Small resistor-step-up transformer or big resistor and 1:1 ratio?
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