Hi, I'm looking for board layout for the LM1876 on a single supply for 48-52v. I've been tasked at work to design an amp for 2 x 15 watt horn speakers to be poe powered the board should preferably be single sided.
This is not exactly what you want, but maybe also of interest ?
It is a small amp used in a table top PC speaker :
Mini DCAAV with Dayton ND91 ?
Sennheiser HD650 vs AKG Q701 QJ
The LM1876 is powered by a 19V notebook supply which has a floating -ve pole (not connected to Mains Earth).
This is of greatest importance.
But there is no reason why you cannot go to 24V given enough heat sinking.
The circuit uses split rails with an active virtual earth from the single supply.
The 1876 is used as a bridged amp for balanced input to maximise output voltage but eliminate output coupling caps.
For single ended input, one can just add a THAT 1646, etc.
We built a total of 30 of these.
Very happy with the sound, considering it is a very simple chip amp.
Patrick
It is a small amp used in a table top PC speaker :
Mini DCAAV with Dayton ND91 ?
Sennheiser HD650 vs AKG Q701 QJ
The LM1876 is powered by a 19V notebook supply which has a floating -ve pole (not connected to Mains Earth).
This is of greatest importance.
But there is no reason why you cannot go to 24V given enough heat sinking.
The circuit uses split rails with an active virtual earth from the single supply.
The 1876 is used as a bridged amp for balanced input to maximise output voltage but eliminate output coupling caps.
For single ended input, one can just add a THAT 1646, etc.
We built a total of 30 of these.
Very happy with the sound, considering it is a very simple chip amp.
Patrick
> LM1876 requires a dual rail supply and will not work correctly with a single supply.
https://www.diyaudio.com/forums/chip-amps/50973-lm1875-lm1876-single-supply.html#post569463
Cheers,
Patrick
https://www.diyaudio.com/forums/chip-amps/50973-lm1875-lm1876-single-supply.html#post569463
Cheers,
Patrick