High current capable Class D amplifier
Experimentonomen, Sat Sept 15 2012, 11:42AMThis is a project i started last weekend after doingf class AB for some time.
This is the basic circuit of this project:
And this is what it looks like in reality:
This power stage can handle up to 47A continous into any load impedance, in the video its driving a 1ohm load.
Re: High current capable Class D amplifier
Josh Campbell, Mon Sept 17 2012, 03:12AM
Very nice, do you plan on cleaning this up into a usable package or was this just a learning project? What is the THD approximately? I'm asking because this is a project I've wanted to do for a while. Not sure if a class D would be right for me, quite a few possible draw backs, like power supply noise qualified by the power supply rejection ratio (PSRR) and by the power supply induced intermodulation distortion (PS-IMD). Would love to see more on this as you progress, keep us updated! :)
Josh Campbell, Mon Sept 17 2012, 03:12AM
Very nice, do you plan on cleaning this up into a usable package or was this just a learning project? What is the THD approximately? I'm asking because this is a project I've wanted to do for a while. Not sure if a class D would be right for me, quite a few possible draw backs, like power supply noise qualified by the power supply rejection ratio (PSRR) and by the power supply induced intermodulation distortion (PS-IMD). Would love to see more on this as you progress, keep us updated! :)
Re: High current capable Class D amplifier
Experimentonomen, Mon Sept 17 2012, 04:43PM
It was mostly for fun as well as intended for subwoofer use only.
THD, IMD and that is completely totally unknown.
Experimentonomen, Mon Sept 17 2012, 04:43PM
It was mostly for fun as well as intended for subwoofer use only.
THD, IMD and that is completely totally unknown.
Re: High current capable Class D amplifier
Experimentonomen, Thu Jan 17 2013, 08:28PM
This amplifier is now running off 2x85VDC and capable of over 1800 watts peak into a 2 ohm load(tested).
This is the schematic:
A video:
A pic:
Experimentonomen, Thu Jan 17 2013, 08:28PM
This amplifier is now running off 2x85VDC and capable of over 1800 watts peak into a 2 ohm load(tested).
This is the schematic:
A video:
A pic:
Re: High current capable Class D amplifier
E.TexasTesla, Thu Jan 17 2013, 09:14PM
Very nice. By the way your work bench looks alot like mine after a project. ;) I need more space.
E.TexasTesla, Thu Jan 17 2013, 09:14PM
Very nice. By the way your work bench looks alot like mine after a project. ;) I need more space.
Re: High current capable Class D amplifier
Experimentonomen, Fri Jan 18 2013, 04:23PM
I'll see if i'll start working on building a housing for this amp this weekend.
Experimentonomen, Fri Jan 18 2013, 04:23PM
I'll see if i'll start working on building a housing for this amp this weekend.
Re: High current capable Class D amplifier
teravolt, Fri Jan 18 2013, 07:16PM
What is the frequency of your triangle wave generator? Is it a triangle wave or is it a sawtooth and could you post a picture of it on the scope. thanks.
teravolt, Fri Jan 18 2013, 07:16PM
What is the frequency of your triangle wave generator? Is it a triangle wave or is it a sawtooth and could you post a picture of it on the scope. thanks.
Re: High current capable Class D amplifier
Experimentonomen, Fri Jan 18 2013, 08:20PM
Its approx 250kHz and i dont remember the amplitude, but a line signal from a cd player is barely enough to clip the amp.
Experimentonomen, Fri Jan 18 2013, 08:20PM
Its approx 250kHz and i dont remember the amplitude, but a line signal from a cd player is barely enough to clip the amp.
Re: High current capable Class D amplifier
teravolt, Sat Jan 19 2013, 03:15AM
I built the triangle wave generator for a PWM but I noticed that some choose a saw tooth or a triangle is the best one to use or does it matter? N.B.
teravolt, Sat Jan 19 2013, 03:15AM
I built the triangle wave generator for a PWM but I noticed that some choose a saw tooth or a triangle is the best one to use or does it matter? N.B.
Re: High current capable Class D amplifier
Goodchild, Sat Jan 19 2013, 06:58AM
Your workbench is epic....
You are a credit to the engineering race and I salute you!
Goodchild, Sat Jan 19 2013, 06:58AM
Your workbench is epic....
You are a credit to the engineering race and I salute you!
Re: High current capable Class D amplifier
Experimentonomen, Sat Jan 19 2013, 08:46AM
A triangular wave is preferred, a sawtooth wave produces a nonlinear pwm and hence distortion.
Experimentonomen, Sat Jan 19 2013, 08:46AM
A triangular wave is preferred, a sawtooth wave produces a nonlinear pwm and hence distortion.
Re: High current capable Class D amplifier
Experimentonomen, Sat Jan 19 2013, 03:44PM
The boxing has begun:
Experimentonomen, Sat Jan 19 2013, 03:44PM
The boxing has begun:
Re: High current capable Class D amplifier
teravolt, Sat Jan 19 2013, 07:45PM
my bench has more stuff on it. good work Experimentonomen and thanks
teravolt, Sat Jan 19 2013, 07:45PM
my bench has more stuff on it. good work Experimentonomen and thanks
Re: High current capable Class D amplifier
Experimentonomen, Sat Jan 19 2013, 09:39PM
The work continues:
Experimentonomen, Sat Jan 19 2013, 09:39PM
The work continues:
Re: High current capable Class D amplifier
teravolt, Sat Jan 19 2013, 11:53PM
what is the outputs of the transformer
teravolt, Sat Jan 19 2013, 11:53PM
what is the outputs of the transformer
Re: High current capable Class D amplifier
Experimentonomen, Sun Jan 20 2013, 08:37AM
4x30VAC or 2x60VAC 1500VA.
Experimentonomen, Sun Jan 20 2013, 08:37AM
4x30VAC or 2x60VAC 1500VA.
Re: High current capable Class D amplifier
teravolt, Sun Jan 27 2013, 08:16PM
hows your project going
teravolt, Sun Jan 27 2013, 08:16PM
hows your project going
Re: High current capable Class D amplifier
Josh Campbell, Sun Jan 27 2013, 10:02PM
Great progress! How's the case coming along?
Josh Campbell, Sun Jan 27 2013, 10:02PM
Great progress! How's the case coming along?
Re: High current capable Class D amplifier
Experimentonomen, Sun Jun 16 2013, 08:01PM
Dug this beast outta storage and did some more work on it:
Testing the psu:
Some 5V regs and it might live again, however im contemplating rebuilding it to self oscillating post filter feedback UcD based rather than the current clocked topology as i generally dislike having to deal with triangular wave generators.
Experimentonomen, Sun Jun 16 2013, 08:01PM
Dug this beast outta storage and did some more work on it:
Testing the psu:
Some 5V regs and it might live again, however im contemplating rebuilding it to self oscillating post filter feedback UcD based rather than the current clocked topology as i generally dislike having to deal with triangular wave generators.
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