My discrete class d project

[nigelwright7557]

I reckon Savu means the same as I'm going to say.

Can you show your circuit diagram with a WHITE background, not black, please.🙂

It's a complete pain in the eyeballs to examine, as you have it.

Sandy

My software doesnt allow a white background.

I use black backgrounds because white ones give me migraine.

 

[Th3 uN1Qu3]

@ savu: I'd totally forgot about this... Maybe because i didn't need it yet. I will build it sometime, but no idea on the ETA.

 

[Pafi]

Here is a similar project with discrete parts,

+/-45Vdc supply, 150W RMS into 4 ohm, 250khz, 0.31% THD @ max power, 1.6W dissipated per Mos Fet.

It only exists in LTspice, I never built it.

Regards,
savu

Savu!

Amasingly simple, and it may wouldn't have blown, if D1 had a higher voltage rating. Decoupling capacitors are needed on supply rails. (I would call negative rail Vss instead of Vcc.)

 

[savu]

hello Pafi.

i know that the caps are missing but i never use them in simulations.
i wish i could have the time to build this and see how it behaves. 🙁

regards,
savu

 

[nigelwright7557]

I found my output filter inductor was cooking at 200 degrees C at idle.

Found the oscillator frequency to be too low at 140KHz.
Increased the speed of the oscillator to 220KHz and the inductor doesnt get so hot.

Noticed a faint whistle in the background of the audio and this was fixed with better decoupling on the IR2113 VCC rail close to the regulator.