matthias
Well-known member
when I measure the output of my converter at 0db it is 2,8V AC
it would be perfect if the signal is at 2V AC before the attenuator...
it would be perfect if the signal is at 2V AC before the attenuator...
That's not true. As long as the signal is differential floating the connection works perfectly well. Ground referenced or not doesn't matter.Operating in floating mode (attenuator with no connection to gnd) would only work when not switched to mono as the summing stages have a reference to GND.
That's not true. As long as the signal is differential floating the connection works perfectly well. Ground referenced or not doesn't matter.Operating in floating mode (attenuator with no connection to gnd) would only work when not switched to mono as the summing stages have a reference to GND.
I was wondering how you plan to do the headphone amp with the TPA6120?
I think there is just an SMD version of the opamp or am i missing something here?
Never! That opamp uses a current feedback topology and will turn into an oscillator if you do this. You'll need a feedback resistor, about 2k seems appropriate. Basically a good idea to not leave things floating though.You may join TPAs pin 16 (Rin-) with pin 19 (Rout).
Indeed, they should be placed closer.The 10 Rs could be placed closer to the TPAs output.
One might argue if this chip is really the best solution anyway--I'd rather have used a decent buffer within the OP275 feedback loops. Simpler and likely higher performance as well.Or do you have a different solution?
I'd place some 22 pF or 33 pF across OP275s 47k feedback resistors close to the chip.
I second both statements, as shown it is unlikely that these stages will become stable. It has all been said before in this thread...Rail decoupling at OP275s should be added.
Inverting will surely show lower distortion (though I'm not sure if this is the intention of the author to use inverting), at the cost of much higher noise (at least with these 47k resistors).Still don't get it, why you don't wire them as non inverting voltage followers.
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