Chip Amps for Record Player

Mihkus

Member
2012-07-22 8:01 pm
Oh woaw! LM1875T ... I know 1876T exists but this...?
It should be more like 1875F (FAKE) But absolutely I might even work.
It mainly depends on the recordplayers output voltage. If its near 2V RMS it should be fine. But I really havent seen any that has it so high. Then yes, you do need a preamp
 

Arty

Member
2011-02-24 5:04 pm
i'm not sure you need pre-amp.
if it ain't as loud as it should be, you can increase the gain .

so for now just build the reference design,
try it.
then try it with your... say computer as a source.
if it louder on your computer than on the record player, then adjust the gain setting resistors a bit. you can download the datasheet of the chip, gain calculation is found within it.
 

tomchr

Member
Paid Member
2009-02-11 12:58 am
Calgary
www.neurochrome.com
Oh woaw! LM1875T ... I know 1876T exists but this...?
It should be more like 1875F (FAKE) But absolutely I might even work.

Bogus! The LM1875T is made by TI. You can convince yourself of this pretty easily by looking at the data sheet and product page available here: LM1875 | Mid/High-Power Class D Amplifiers | Audio | Description & parametrics

Now, whether the eBay kit comes with a real or a fake LM1875 is anybody's guess. If, on the other hand, you buy the parts from the TI distributors (Mouser, Digikey, Newark, et al.) you're 99.9999999 % certain that you'll get a real part.

The LM1875 is a fine little mid-power IC amplifier. Nothing wrong with it.

To use any power amp with a record player (aka turntable), you'll need a RIAA preamp (aka phono preamp).

Tom
 
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