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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 7th January 2013, 09:55 PM   #31
PetruV is offline PetruV  Romania
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Signal ground is not conected to power ground and standby pin is conected to positive,while writing this,i realized!maybe 5v is not enough to get it out of standbyD:
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Old 7th January 2013, 10:03 PM   #32
PetruV is offline PetruV  Romania
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Yep just checked the datasheet and the switch on curent for standby is 8.5v
Now need a circuit that can get me 12v from 5v but not drawn too much current to damage a laptop
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Old 8th January 2013, 08:38 AM   #33
PetruV is offline PetruV  Romania
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would a 55w lightbulb work
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Old 8th January 2013, 08:50 AM   #34
PetruV is offline PetruV  Romania
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Just found an 21w lightbulb
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Old 8th January 2013, 08:54 AM   #35
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Hey, I like the way you take possession of your thread!
I would say : keep the audio things separate from the computer thing!
Or you risk to break both! But the main matter is the power supply: it's much
better in having a linear supply - noiseless and powerful- such a transformer-bridge-reservoir/smoothing capacitors. For USB powered amplifiers, I would
stick to amplifiers based on chips housed in 8 pin-dual in line which may absorb
no more than 1 W. Also find some 4 Ω( or 3.2 Ω ) speakers that may enhance
sinergy between a low voltage supply amplifier and speakers.

OMG! Sinergy !!!
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Old 8th January 2013, 09:53 AM   #36
superR is offline superR  Netherlands
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Maybe this is a better option for a first project;
LM1875 GC Circuit Audio Amplifier Board Kit | eBay
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Old 8th January 2013, 10:06 AM   #37
PetruV is offline PetruV  Romania
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Now testing it with the sinal round hooked up to power ground,i only very distorted audio from just one chanell,why? please answer
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Old 8th January 2013, 10:10 AM   #38
PetruV is offline PetruV  Romania
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Quote:
Originally Posted by picowallspeaker View Post
Hey, I like the way you take possession of your thread!
I would say : keep the audio things separate from the computer thing!
Or you risk to break both! But the main matter is the power supply: it's much
better in having a linear supply - noiseless and powerful- such a transformer-bridge-reservoir/smoothing capacitors. For USB powered amplifiers, I would
stick to amplifiers based on chips housed in 8 pin-dual in line which may absorb
no more than 1 W. Also find some 4 Ω( or 3.2 Ω ) speakers that may enhance
sinergy between a low voltage supply amplifier and speakers.

OMG! Sinergy !!!
This powesuplly is very good and sounds better than some linear supplies.The transformers are very expensive and big and offer not much benefit,Yes im realy afraid of breaking my gaming laptop so any of you can come up with a simple tone generator?
All my spekers are 4 ohms,3.2 ohms are those little crap speakers that i blow up from the moment i see

Last edited by PetruV; 8th January 2013 at 10:30 AM.
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Old 8th January 2013, 10:11 AM   #39
PetruV is offline PetruV  Romania
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I have aleardy used tda 2003 kit in my usb amp and tda 8560 or something like that in my main amp
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Old 8th January 2013, 11:02 AM   #40
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55 and 21 W don't exist as values for 'old type' lightbulbs
I know 25 and 60 W ratings ! So, are you sure that you are referring to
the classic lightbulbs, and not the electronic ones ?
Same for the power supply

RE: I blew those crappy speakers from the moment I see
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