lm1875 fizzing away probelm - Page 20 - diyAudio
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View Poll Results: Was a good idea to use two lm1875 or a big stk chip
Use stk 8 27.59%
use lm1875 21 72.41%
Voters: 29. You may not vote on this poll

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Old 3rd February 2013, 05:19 PM   #191
PetruV is offline PetruV  Romania
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that hum is very loud and getting on my nerves how can i atenuate it
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Old 3rd February 2013, 05:30 PM   #192
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Quote:
Originally Posted by PetruV View Post
Adios hiss from tda2003,hello 50hz hum from transformer psu

If you followed what I said in my first reply


Hum from a *normal* trafo ?
You should rotate and move in space or the trafo or the circuit ( that may caption some noise by some groovy intercapacitance intersections-and resistive-the paths to ground ) to keep sensible parts away from some flux dispersion....force ?
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Old 3rd February 2013, 06:54 PM   #193
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by picowallspeaker View Post

If you followed what I said in my first reply


Hum from a *normal* trafo ?
You should rotate and move in space or the trafo or the circuit ( that may caption some noise by some groovy intercapacitance intersections-and resistive-the paths to ground ) to keep sensible parts away from some flux dispersion....force ?
Normall trafo but too weak far away from electonics.As its an wall wart
Maybe some diodes in the bridge rectifier died from overtemperature from when i salvaged it from the old board,the bridge wasnt new
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Old 3rd February 2013, 07:03 PM   #194
PetruV is offline PetruV  Romania
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Not for long ive been using stereo speakers,i really love the stereo efect,but my tda2003 i mono ,th sound system on my old comp has an burned chanell,and my tda 8560 had a sub on one chanel and satelites on the other now its all stereo ,havent heard any stereo sounf for at least 5 years,and the stereo image on my speaakers i grea
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Old 3rd February 2013, 07:04 PM   #195
PetruV is offline PetruV  Romania
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Tomorow will try after coming home from school to relace the bridge rectifier and use another transformer,maybe parallel em up and use another bridge rectifier
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Old 4th February 2013, 06:09 PM   #196
PetruV is offline PetruV  Romania
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Btw have you even seen a cd that has that shiny part very red,when i was 5 i was taking apart a pc(at thaat time i was finding a lot of dumped computers but my mom kept thowing them out)and i didnt know a thing about computers.Took a computer cd drive apart and found a red cd inside,the shiny bottom was red not silve,and it looked awesome,I wold like some now



Anyone knows a good chip that runs at 12v to 5v,is powerfull and single chanell

Last edited by PetruV; 4th February 2013 at 06:11 PM.
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Old 4th February 2013, 07:19 PM   #197
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Originally Posted by PetruV View Post
Anyone knows a good chip that runs at 12v to 5v,is powerfull and single chanell
Not too much output power with such low supply voltage, but I guess you can try the TD2822 in BTL mode.
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Old 4th February 2013, 07:24 PM   #198
PetruV is offline PetruV  Romania
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Originally Posted by ezavalla View Post
Not too much output power with such low supply voltage, but I guess you can try the TD2822 in BTL mode.
Fine then just at 12 v but like 20w or so
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Old 4th February 2013, 09:23 PM   #199
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Originally Posted by PetruV View Post
Fine then just at 12 v but like 20w or so
Well... you can try a TDA2005 en BTL mode for just one channel (be careful, there are plenty of such chips badly fake). The chip is a bit sensitive to GND layout and decoupling, but there a lot of good PCBs in the market...
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Old 5th February 2013, 07:09 AM   #200
PetruV is offline PetruV  Romania
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Originally Posted by ezavalla View Post
Well... you can try a TDA2005 en BTL mode for just one channel (be careful, there are plenty of such chips badly fake). The chip is a bit sensitive to GND layout and decoupling, but there a lot of good PCBs in the market...
i think il stay with the tda 8560q, but i want something like 4x50w that cn be bridged in 2x50w +100w
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