built pt2323/2322 processors as a preamp for my 350w amplifiers
( Ampcontrol
first schematic used second pt2322 insted of tda Electro help: 12/01/13 )
. As they(350w amps) need quite high input voltage, processors by them self are to weak to drive them so i aded tl071 per channel with 2x or so amplification.
i`m having this problem of white noise coming from pt processors which is amplified quite to much thrue tl071...
Have anyone played with theese processors and can asist me with info on are they supposed to have such white noise even with no input or volume set to -79db. its like pt2322 has op amp in its back end with high amplification.
Maby these processors are not meant to be in "hifi" systems. or maby i should put op amps in front of pt because they can take close to 4v input.
maby i`m missing something?
btw i`m 100% sure that this noise originates in pt processors because connecting amp directly to usb dac noise is like 10- 20 times smaller even at max volume i can barely hear it with head close to speakers. noise is not digital pt and atmega has different power supply's. osciloscope doesnt show anything while using atmegas functions.
as i understand white noise is noise that you hear when amp is set to max volume and nothing is playing. soft sssssssssss sound
( Ampcontrol
first schematic used second pt2322 insted of tda Electro help: 12/01/13 )
. As they(350w amps) need quite high input voltage, processors by them self are to weak to drive them so i aded tl071 per channel with 2x or so amplification.
i`m having this problem of white noise coming from pt processors which is amplified quite to much thrue tl071...
Have anyone played with theese processors and can asist me with info on are they supposed to have such white noise even with no input or volume set to -79db. its like pt2322 has op amp in its back end with high amplification.
Maby these processors are not meant to be in "hifi" systems. or maby i should put op amps in front of pt because they can take close to 4v input.
maby i`m missing something?
btw i`m 100% sure that this noise originates in pt processors because connecting amp directly to usb dac noise is like 10- 20 times smaller even at max volume i can barely hear it with head close to speakers. noise is not digital pt and atmega has different power supply's. osciloscope doesnt show anything while using atmegas functions.
as i understand white noise is noise that you hear when amp is set to max volume and nothing is playing. soft sssssssssss sound