Its purely the frequency response at the top end I find lacking. If you say they are similar I had better check other components first, like the speakers.
P.S.
I realise this is hijacking Tubes4e4 thread, so sorry Tubes4e4 I will start a new thread.
Is there any of the LM1875 boards/kits on the net that is OK to buy?
+/- power please...
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Every good technical product must have some design margin. So why not use TDA7293 or LM3886 and then adjust volume. That's easy, isn't it?
It is possible to argue that overall costs are higher but potential savings are marginal in this price range. And is it worth save few bucks and end-up with an order of magnitude higher TDA?
A LM1875 can do 20w into both 4ohm & 8ohm very nicely although OP wants only 10watts. On the other hand the price of Tda7293 is almost double & in current situation forget about getting lm3886 from a reliable source.
Thanks - I was more thinking a kit with components or stuffed. I see the LM component cost 5-6 € at professional outlets. Playing board goes for 10 - is the LM then fake (and bad) for sure, or?
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TI LM1875 is about 4 Euros here, with further price breaks for bulk purchases at Mouser India.
Chinese ones are 0.20 Euro retail here, same as 2030A made in China.
Profusion has a bulk price on UTC 2050A, which is about 60% of the small quantity price. About 1 Euro, IIRC, please check.
The UTC chip is legally licensed from ST.
Chinese ones are 0.20 Euro retail here, same as 2030A made in China.
Profusion has a bulk price on UTC 2050A, which is about 60% of the small quantity price. About 1 Euro, IIRC, please check.
The UTC chip is legally licensed from ST.
Only 1, grab it while you can
https://www.diyaudio.com/community/threads/various-stuff-free-or-for-sale.392629/post-7221935
dave
https://www.diyaudio.com/community/threads/various-stuff-free-or-for-sale.392629/post-7221935
dave
Ask ST, UTC, or Profusion.
I did read about it somewhere, forgot.
Bear in mind that UTC are using the TDA series numbers, which is sort of used by ST alone (maybe Philips as well), and their products are sold in Europe, for many years, without any objection from ST.
In any case, Europe is known for stringent enforcement against copies, so if sellers in UK and Germany are active, they are not likely to be fake chips, some authority must have been provided.
I did read about it somewhere, forgot.
Bear in mind that UTC are using the TDA series numbers, which is sort of used by ST alone (maybe Philips as well), and their products are sold in Europe, for many years, without any objection from ST.
In any case, Europe is known for stringent enforcement against copies, so if sellers in UK and Germany are active, they are not likely to be fake chips, some authority must have been provided.
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NareshBrd
you said that TDA2050 from UTC is manufactured under ST license, but I cannot find that kind of info online, that's why I asked you to show it to me if possible.I read datasheet from UTC http://www.unisonic.com.tw/datasheet/TDA2050.pdf and I cannot find any of the information regarding this license.
I believe that no license is required to manufacture TDA2050 because patents have expired a long time ago, and ST listed this chip as obsolete in 2011 already. It is a 30+ years old IC. The 2022 UTC company presentation lists several old wokhorses from TI, ST, NXP and the equivalent parts from UTC. It is unlikely that the silicon manufacturing is done the same way, or that a license of any kind has been negotiated with the original manufacturer.
But as far as i know UTC also makes 1875T, an ACTIVE TI product(last of its kind, by original manufacturer).
1875 is also a old product, patents are expired, anyone can produce it as they like, without license. The ordering number for the UTC part is different from the TI part to further avoid any issue: the TI part is LM1875T while the UTC part is LM1875L or LM1875G ,but they add some extra characters ending with a T on the full ordering number. This is common practice for old semiconductors and does not mean that the copy is worse than the original. It might even be better on some parameters, although unlikely. It only means that it is a different part and it is best to do a revalidation if there is a component change request. A new lab test is mandatory if the part has been listed as safety critical. This does explain why some ancient parts are still manufactured by the original vendor despite cheaper competition.
You surely must be built different than us.
TI claims:
anybody hearing 70kHZ as lacking does not belong to this world.
PCAN
You got my point ,
anyone could make an 2030/2040/2050 but that should not imply they will be identical with the original ST TDA2030/2040/2050.
But, when I was very young, RFT was producing electronic components and electronics in Germany(East Germany), they were making a2030V/H chips 30+ years ago.
Attachments
I think @thyristor44 was complaining about counterfeit LM1875 which comes with cheap amplifier kits, where according to @NareshBrd there is no point obtaining original LM1875 paying $7 each because they sounds quite 'similar'.
I said UTC 2050 is similar, and cheaper.
Also, in post# 20, I did say I use flea market amps.
And that there is no point in spending more than $20 to build a 1875 stereo amp, when ready boards are available.
Class D and discrete options are available as well.
Adason has one piece available for $40, if you are so inclined.
NanoFarad / Nirupam, please tell us what test equipment you use to draw the sonic conclusions you claim.
For 10W, Philips used uPC1238 from NEC in older Powerhouse series, TDA2030 is direct substitute if that chip is to be replaced.
Check the data sheets, at 10W output, no difference exists between (original) 1875, 2030 and 2050.
Also, the UTC part is said to be of good quality, so why not?
And for one kit costing $40 at most, we have spent a lot of time over it.
Also, in post# 20, I did say I use flea market amps.
And that there is no point in spending more than $20 to build a 1875 stereo amp, when ready boards are available.
Class D and discrete options are available as well.
Adason has one piece available for $40, if you are so inclined.
NanoFarad / Nirupam, please tell us what test equipment you use to draw the sonic conclusions you claim.
For 10W, Philips used uPC1238 from NEC in older Powerhouse series, TDA2030 is direct substitute if that chip is to be replaced.
Check the data sheets, at 10W output, no difference exists between (original) 1875, 2030 and 2050.
Also, the UTC part is said to be of good quality, so why not?
And for one kit costing $40 at most, we have spent a lot of time over it.
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