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4hv.org :: Forums :: Projects
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High current capable Class D amplifier

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Experimentonomen
Sat Sept 15 2012, 11:42AM Print
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		This is a project i started last weekend after doingf class AB for some time.

This is the basic circuit of this project: Link2

And this is what it looks like in reality: Link2

This power stage can handle up to 47A continous into any load impedance, in the video its driving a 1ohm load.
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Josh Campbell
Mon Sept 17 2012, 03:12AM
Josh Campbell Registered Member #5258 Joined: Sun Jun 10 2012, 10:15PM
Location: Missouri - USA
Posts: 119
 		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! :)
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Experimentonomen
Mon Sept 17 2012, 04:43PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		It was mostly for fun as well as intended for subwoofer use only.

THD, IMD and that is completely totally unknown.
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Experimentonomen
Thu Jan 17 2013, 08:28PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		This amplifier is now running off 2x85VDC and capable of over 1800 watts peak into a 2 ohm load(tested).

This is the schematic: Link2

A video: Link2

A pic: Link2
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E.TexasTesla
Thu Jan 17 2013, 09:14PM
E.TexasTesla Registered Member #4362 Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
 		Very nice. By the way your work bench looks alot like mine after a project. ;) I need more space.
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Experimentonomen
Fri Jan 18 2013, 04:23PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		I'll see if i'll start working on building a housing for this amp this weekend.
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teravolt
Fri Jan 18 2013, 07:16PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		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.
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Experimentonomen
Fri Jan 18 2013, 08:20PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		Its approx 250kHz and i dont remember the amplitude, but a line signal from a cd player is barely enough to clip the amp.
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teravolt
Sat Jan 19 2013, 03:15AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		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.
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Goodchild
Sat Jan 19 2013, 06:58AM
Goodchild Registered Member #2292 Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
 		Your workbench is epic....

You are a credit to the engineering race and I salute you!
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