Hello,
I bought cheap DAC to convert toslink coming from my TV to analog.
Because output of this DAC was way to low I added single stage preamplifier based on NE5532.
Now my question is, what would be better, I`m worried about ground loop noise problems.
1.) DAC on it`s cheap smps 5v 1500mA and amplifier on seperate linear regulated power supply.
2.)DAC and preamp on same transformer diode bridge, smoothing caps, then 5v linear regulator for dac and 12v linear for preamp? -This one sims like a good option to me, but I am affraid that I will get digital noise on preamp.
3.) DAC and preamp on different linear regulated power supplies?
On both devices audio gnd is gnd (not shifted) if this plays any rolle.
I bought cheap DAC to convert toslink coming from my TV to analog.
Because output of this DAC was way to low I added single stage preamplifier based on NE5532.
Now my question is, what would be better, I`m worried about ground loop noise problems.
1.) DAC on it`s cheap smps 5v 1500mA and amplifier on seperate linear regulated power supply.
2.)DAC and preamp on same transformer diode bridge, smoothing caps, then 5v linear regulator for dac and 12v linear for preamp? -This one sims like a good option to me, but I am affraid that I will get digital noise on preamp.
3.) DAC and preamp on different linear regulated power supplies?
On both devices audio gnd is gnd (not shifted) if this plays any rolle.
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You can use separate isolated DC-DC converters to power the DAC and the preamp. This way you eliminate the ground loops entirely.
Will try with 1 transformer and 2 linear regulators and solve from there if I get noises.