Firstly, the class-d sub-forum nowadays is full of repair or purchase related queries, so congratulations on your decision to build something. Some 10 years ago, things here were so different.
I'd recommend the Philips UM10155.
https://handsontec.com/pdf_files/UM10155_2_Discrete_ClassD_Amp.pdf
I'd recommend the Philips UM10155.
https://handsontec.com/pdf_files/UM10155_2_Discrete_ClassD_Amp.pdf
i should say i don’t know much about class d, i’ve only built A, A/B etc, i’ve read a little so understand the basics. One thing i’m not sure about is the low pass filter, if i understand correctly this is there to take out the high frequency switching noise and is not the same as the low pass filter blocking the signal high frequency, sorry if this is a basic question
I found this, appreciate any input:
https://www.allaboutcircuits.com/projects/how-to-build-a-class-d-power-amplifier/#loginModal
https://www.allaboutcircuits.com/projects/how-to-build-a-class-d-power-amplifier/#loginModal
This is quite a basic schoolbook attempt to a class-D amp, useless in practice and with many drawbacks:
-Input comparators LM393 will yield poor noise and distortion figures
-The external triangle generator (not shown) will add to distortion
-absence of global feedback to correct any nonlinearities of the pwm-modulator
-absence of overcurrent-, shootthrough- overtemperature protection
Besides these drawbacks there is the general problem of bus pumping with half-bridge topology.
So I recommend a full bridge-configuration instead that does not have this problem
and requires a simple unipolar supply only.
Building a full bridge from scratch may be done with TPA3255 yielding up to ca 200W/4 Ohms.
Above this power level the drivers from IR/Infineon may be an option.
You will find readily built modules at sure-electronics.
-Input comparators LM393 will yield poor noise and distortion figures
-The external triangle generator (not shown) will add to distortion
-absence of global feedback to correct any nonlinearities of the pwm-modulator
-absence of overcurrent-, shootthrough- overtemperature protection
Besides these drawbacks there is the general problem of bus pumping with half-bridge topology.
So I recommend a full bridge-configuration instead that does not have this problem
and requires a simple unipolar supply only.
Building a full bridge from scratch may be done with TPA3255 yielding up to ca 200W/4 Ohms.
Above this power level the drivers from IR/Infineon may be an option.
You will find readily built modules at sure-electronics.
I like to build all my gear if I can, but for a sub amp, I’d just buy this one.
https://a.co/d/en8Ii79
https://a.co/d/en8Ii79