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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 13th January 2013, 08:11 AM   #111
PetruV is offline PetruV  Romania
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The project im building is a 2 tda 2003 with dc jaack for powering from usb,9v battery ,car batery for max power or power plug also for max power
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Old 13th January 2013, 08:43 AM   #112
blu_glo is offline blu_glo  England
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if you can find an old laptop supply 12 to 18V they usually give out several amps and would be ideal!
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Old 13th January 2013, 09:38 AM   #113
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by blu_glo View Post
if you can find an old laptop supply 12 to 18V they usually give out several amps and would be ideal!
yep but i cant find not event a crt monitor thrown out these days
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Old 14th January 2013, 05:26 PM   #114
PetruV is offline PetruV  Romania
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Please help me with something,find me a chip that is high power when powered at higher voltage but still turn on and work at 5v
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Old 14th January 2013, 05:42 PM   #115
johnr66 is offline johnr66  United States
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Authentic TDA2050 ICs turn on at 3 volts. The LM1875 turns on at 9 volts. The TDA2050 has a slightly higher output swing at a given supply voltage than the 1875 and it has 5 amps of peak current vs 4 for when you really push it. It sounds just as good to my ears. The TDA2050 is all around a better chip in my book.

BTW, if you want people to help you, you need to focus on one chipamp and design. Stop bouncing all over the place. Most people have stopped replying to this thread. Too many questions and no focus.
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Old 14th January 2013, 06:01 PM   #116
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by johnr66 View Post
Authentic TDA2050 ICs turn on at 3 volts. The LM1875 turns on at 9 volts. The TDA2050 has a slightly higher output swing at a given supply voltage than the 1875 and it has 5 amps of peak current vs 4 for when you really push it. It sounds just as good to my ears. The TDA2050 is all around a better chip in my book.

BTW, if you want people to help you, you need to focus on one chipamp and design. Stop bouncing all over the place. Most people have stopped replying to this thread. Too many questions and no focus.
I really agree but I need to find the schematic for the preamp in that amp,im going to take a photo of the bottom of the board and someone coud figure out what schematic it is, or most better i wil do it.
But that tda 2050 turns on and works at 5 v in single supply?
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Old 14th January 2013, 06:25 PM   #117
PetruV is offline PetruV  Romania
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Even more pics of the sittuation on the lm1875
Attached Images
File Type: jpg DSCF2892[1].JPG (610.0 KB, 57 views)
File Type: jpg DSCF2893[1].JPG (612.6 KB, 53 views)
File Type: jpg DSCF2894[1].JPG (602.1 KB, 45 views)
File Type: jpg DSCF2895[1].JPG (592.4 KB, 42 views)
File Type: jpg DSCF2896[1].JPG (618.9 KB, 42 views)
File Type: jpg DSCF2897[1].JPG (612.1 KB, 18 views)

Last edited by PetruV; 14th January 2013 at 06:28 PM.
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Old 14th January 2013, 06:49 PM   #118
blu_glo is offline blu_glo  England
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I'd say if you ever give up on finding the schematic for that board, google 3 band tone control and rebuild it salvaging (carefully) the pots from that board. There seems to be delay line circuits amongst others involved on that board but without schematic it's almost impossible to tell whats going on....
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Old 14th January 2013, 06:51 PM   #119
PetruV is offline PetruV  Romania
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I would remove the preamp crap but my mom would be pissed because she liked that amp and we paid a lot for it
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Old 14th January 2013, 07:31 PM   #120
PetruV is offline PetruV  Romania
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Id say ,i wll jut make a pot volume contol for now, i will be using an 1k pot,is it useefull for this. I also have 100r ,33k ,1m.Sadly thats all i have
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