This how to recognize the original LM1875
I am shopping for the IC, and I couldn't find any directives on this site to get for sure original ones. So I share my investigation.
An excellent website is LM1875 manual with 100% guaranteed detection of a fake chip.
UTC manufactures also genuine ones under D1875 old versions and LM1875L new. Both have also fake ones. TI has old version with big letters in the center, forget it, and the new version with small letters on the top.
Looking on pictures, I noticed that the original new one, not the old has non-uniform upper tab and the back is wide and rectangular. On Aliexpress I found only one proposition for 18$/10pcs, to know that TI sells 1190$/1000pcs.
I am shopping for the IC, and I couldn't find any directives on this site to get for sure original ones. So I share my investigation.
An excellent website is LM1875 manual with 100% guaranteed detection of a fake chip.
UTC manufactures also genuine ones under D1875 old versions and LM1875L new. Both have also fake ones. TI has old version with big letters in the center, forget it, and the new version with small letters on the top.
Looking on pictures, I noticed that the original new one, not the old has non-uniform upper tab and the back is wide and rectangular. On Aliexpress I found only one proposition for 18$/10pcs, to know that TI sells 1190$/1000pcs.
Farnell, Digikey, Mouser and RS Components have genuine stock.
LM1875T/NOPB | LM1875T/NOPB Texas Instruments, Audio Amplifier 5.5MHz, 5-Pin TO-220 | RS Components
https://nz.element14.com/texas-instruments/lm1875t-nopb/ic-op-amp-single-70khz/dp/3116856?ost=lm1875
Search results for: LM1875 – Mouser New Zealand
Blocked
LM1875T/NOPB | LM1875T/NOPB Texas Instruments, Audio Amplifier 5.5MHz, 5-Pin TO-220 | RS Components
https://nz.element14.com/texas-instruments/lm1875t-nopb/ic-op-amp-single-70khz/dp/3116856?ost=lm1875
Search results for: LM1875 – Mouser New Zealand
Blocked
Mouser does not offer free shipping in USA , Newark wants 150$ spent in order to get free shipping , plz don’t buy your chips from AliExpress !!!!
That seems ridiculous, free shipping all the way across the pacific to little old New Zealand but no free shipping domestically? That strikes me as the opposite of normal....
That seems ridiculous, free shipping all the way across the pacific to little old New Zealand but no free shipping domestically? That strikes me as the opposite of normal....
i wrote in some pages before...as i remember...
Digikey 20 pcs 52 euro + VAT and deliver...---> 66 euro
Slow but steady progress on my little Ebay LM1875, did some more wiring tonight...
View attachment 900077
Hi Davefred,
Do you have a link for the SMPS?
Denis
Hi Denis
i bought the same...important is that it is dual = +/- 24V etc.
.i what tot try a SMPS vs unregulated power supply...
dual group output +-24V and DC12V 300W power board MX50 L20 audio amplifier board power supply instead toroidal transformer|AC/DC Adapters| - AliExpress
chris
i bought the same...important is that it is dual = +/- 24V etc.
.i what tot try a SMPS vs unregulated power supply...
dual group output +-24V and DC12V 300W power board MX50 L20 audio amplifier board power supply instead toroidal transformer|AC/DC Adapters| - AliExpress
chris
Hi Denis
i bought the same...important is that it is dual = +/- 24V etc.
.i what tot try a SMPS vs unregulated power supply...
dual group output +-24V and DC12V 300W power board MX50 L20 audio amplifier board power supply instead toroidal transformer|AC/DC Adapters| - AliExpress
chris
I have only powered up the SMPS to see that the voltages measure correctly, I have not put it under load, but it makes a funny sound.
Does yours make a funny sound? A high pitched sound?
Thank you,
David.
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