DIY Good Class D amplifier

[Acca]

Hi Aleks,this is the waveform i measure on both out of Ka before 1N4148, 5 V/div. @ 5us,please check.

Waveforms is OK.

 

[don2007ksa]

d amp by Acca

With 1khz sine wave input signall,wave form measured at input pin of IR2184

 

[Acca]

My waveform is same as your.This is ok now.Measure voltage at output,before filter.

 

[don2007ksa]

Hi aleks,the voltage before the coil is 20 to 60 mv,but after a couple of minutes the voltage goes to negative value (-100mv ) and continue to it's negative reading,i remember this senario on class A amplifier something like (thermal run-away)but my output FET'S is in normal temp,less than 40 deg,my frequency set to 160khz any solution?hope to hear more from you.thank's.

 

[Acca]

Maybe your pot. have temp. drift?
Or input capacitor?
And what's purpose of many LED's?
What is that blue cap's on right?
Where's fet's,under board?

 

[don2007ksa]

d amp by Acca

Green at the upper part is a 12V indicator,red lower right osc. indicator,red on lower left OCP,blue caps for snubber if ever needed, by the way Aleks please post a schematic with feedback, how can it be implemented on this circuit?thanks.

 

[Acca]

I'll post later.........

 

[kanon]

good amp.

what do you think of this layout, it will arm how it works for me is the best of the best in the class d diy maplificadore..
theam translater no good..

 

[kanon]

good amp.

what do you think of this layout, it will arm how it works for me is the best of the best in the class d diy maplificadore..
theam translater no good..

 

[Acca]

See post #24 for sugestions....

 

[don2007ksa]

Hi kanon please post a layout with buffer (totem pole or TC42XX series) to drive more output's,and if you had an idea of feedback on this design please include it on your layout,hope to hear more from you.(buenas dias).

 

[Acca]

Feed back can be make same as classic amp. (for example tda7294)
On SG IC you have op-amp.Try to wire it in inverting or noninverting op amp.Speaker + pole can be used for feedback,instead internal output of op-amp.Simple

 

[kanon]

Totem pole + IR2110

I'll try in the next week.
No feedback signal.!
will wait and not have much emi.
Not much going to do bummmm.
I love when they explode the mosfets.

 

[Acca]

Oh 90N20,90A 200V
This can be music welding inverter

 

[kanon]

Oh 90N20,90A 200V
This can be music welding inverter

those are the only mosfet, I have
and pure igbt
if it works maybe buy irb4227

the kicker amp uses 6 of these in single subwoofer IXGQ90N33TCD1 and are very power.
that's why I like this design in order to vary the freq. for use with these IGBTs.
and are not amp. welding if not for ears popping
thanks.
: Wave2s:: Wave2s:: Wave2s:: Wave2s:

 

[Cresnet]

Any oscilloscope waves of frequency response?

 

[don2007ksa]

hi kanon please post a design with feedback,cause the original schematic will produce dc at higher output,thank's

 

[Acca]

those are the only mosfet, I have
and pure igbt
if it works maybe buy irb4227

the kicker amp uses 6 of these in single subwoofer IXGQ90N33TCD1 and are very power.
that's why I like this design in order to vary the freq. for use with these IGBTs.
and are not amp. welding if not for ears popping
thanks.
: Wave2s:: Wave2s:: Wave2s:: Wave2s:

 

[Acca]

hi kanon please post a design with feedback,cause the original schematic will produce dc at higher output,thank's

???

 

[PetruV]

I have almost finished this,only need ir2184 and toroid inductor.i couldnt find them
Is there anything wrong with using 3.3k for dc offset pot and uf4007 instead of 1n5819??
mosfets are irfp250n