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Old 3rd August 2013, 07:30 PM   #51
PetruV is offline PetruV  Romania
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no longer quiet,but it seems to distort away after 30 sec on 100w,over a period which speakers go up and up untill it distorts away,sounds as if only one rail is present.
could it be because the rail voltage is going down,and the lm1875t acts weird on low supply voltages,or what. apart from this it works very well.
Tomorow i will start to design an amplifier based on 2sa1943 and c5200,with the help of you guys
yes,the voltage is going down because of huge offsets in both speakers
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Old 4th August 2013, 12:30 PM   #52
PetruV is offline PetruV  Romania
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Works,perfectly just very hot,need new heatsink,very clear sound,it just needed 2 10k pull down resistors from input to gnd and works perfectlly.
Moral of the story? no matter how much you are a professional you will still make mistakes if you dont listen closely to the diagram in the pdf
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Old 4th August 2013, 04:44 PM   #53
PetruV is offline PetruV  Romania
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it sounds a tiny bit better than tda2003,a little brighter in the trebble and more boomy in the bass,unlike tda2003 which is more precise,but lacks sometimes bass. altough the tda2003 keeps the cones in a better grip,lm1875 is a litlle unontrolled,mid end is same.
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Old 4th August 2013, 04:45 PM   #54
Dr_EM is offline Dr_EM  United Kingdom
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Quote:
Originally Posted by PetruV View Post
it ok to use 10r resisistor for zobel?
I think it's meant to be 1 Ohm? Increasing it can cause instability/oscillation and this can certainly lead to the high operating temperatures you're experiencing. It'll impede the sound quality too of course.
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Old 4th August 2013, 05:50 PM   #55
PetruV is offline PetruV  Romania
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Originally Posted by Dr_EM View Post
I think it's meant to be 1 Ohm? Increasing it can cause instability/oscillation and this can certainly lead to the high operating temperatures you're experiencing. It'll impede the sound quality too of course.
yes it wasnt ok,it works better with 1 ohm
Amp is now working,just needs transformer mounts,after some measurement i found out i get 10v ac,so i at least got my 25watts i asked for!
very stiff supply,22vdc or so,but sags maybe 2volts on max load,transformer is salvaged from an amp that is the cheapest you can buy,had it when i was 8 or so,heatsink is also from same amp,barelly warm on maximum load.i like it very much but it is too problematic for a begginer.
next stop?,designing an discrete amp togheter which will run on 20/0/20v dc!
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Last edited by PetruV; 4th August 2013 at 05:54 PM.
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Old 22nd August 2013, 04:45 PM   #56
PetruV is offline PetruV  Romania
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This litlle amp earned my trust,i hooked up my favorite speaker up,and played all day near clipping since i built it,and is still not blown or even went into protection. what a beast,many small amps didnt pass this test and released smoke upon use
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Old 29th August 2013, 10:39 AM   #57
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I have an old beat up Ekco radio and I built a guitar amp in it using a TDA2003. Its was a bit dry and muddy until I added a miniature tube preamp I got from Oatley Electronics. It's a really nice sounding little amp now. The 5x7 Rola speaker is nice too.
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Old 30th August 2013, 09:37 AM   #58
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Interesting option is to use TDA2005. It's two TDA2003 in bridge configuration, double the power and no need to use output elco. Probably there will be some DC offset, but should not be too high.
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Old 24th September 2013, 05:37 PM   #59
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Anyone know about the LG variety ... i.e., TDA2003LG ?
It's description and specs are a bit different from TDA2003A.
TDA2003LG Single ended output power amplifier - STMicroelectronics
http://www.st.com/st-web-ui/static/a...DM00060994.pdf
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Old 25th September 2013, 07:32 PM   #60
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Originally Posted by hollowman View Post
Anyone know about the LG variety ... i.e., TDA2003LG ?
It's description and specs are a bit different from TDA2003A.
TDA2003LG Single ended output power amplifier - STMicroelectronics
http://www.st.com/st-web-ui/static/a...DM00060994.pdf
Basically, it's the same thing.
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