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Old 2nd February 2005, 03:51 PM   #1
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Default Updated schematic of my class D amp

So, here it is, with all the components values.
Features are balanced input, dc, over and under voltage protections, constant delayed turn on/off delay with muting relay, controled by a 4mhz pic microcontroler. All on board supply and control.

I will post the gerbers for the pcb as well.
It sounds good, and works 100% perfect for now, powered with 37v rails.
Balanced input let me bridge two modules together without any additional components outside of the boards, wich i havent try yet. Power output wil be scary i guess.

cheers !!
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File Type: pdf damp_.pdf (89.7 KB, 1164 views)
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Old 2nd February 2005, 05:16 PM   #2
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And the gerber files...
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File Type: zip damp1.zip (81.3 KB, 390 views)
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Old 2nd February 2005, 05:19 PM   #3
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Second part of the gerbers...
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File Type: zip damp2.zip (37.4 KB, 244 views)
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Old 2nd February 2005, 05:20 PM   #4
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And 1:1 .PDF for copper top, bottom and top silk.
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File Type: zip damp3.zip (92.4 KB, 395 views)
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Old 2nd February 2005, 08:27 PM   #5
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...and .hex file for the pic.
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File Type: zip audampctrl1.zip (436 Bytes, 297 views)
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Old 4th February 2005, 07:42 PM   #6
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Hi Pat,

Excellent work! I'm new to class D but I must say you have inspired me to give a try. But instead of using a half bridge I'm thinking of using a full bridge. The addition of another gate driver, two mosfets, and some additional components doesn't seem to complicated, but I'm not sure if the integrator feedback circuitry would need to be modified for it to work? Possibly a feedback for the upper and lower mosfets. Any suggestions?

Thanks,

Al
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Old 4th February 2005, 07:54 PM   #7
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yep, i have tough about that too. I am still fidling the pcb for eventual order from baree bone pcb's.

I think that if you only add the IR part from the hex inverter, but that you invert the signals, i think it may work. Only concern is the added bootstrap cap, it have to be charged before starting the oscillation...
Other than that, i dont think it is necessary to run another feedback path.
I will give it a try in a near future, maybe just a bare bread board test. It could be implemented into my pcb easely, maybe keeping the same size as well...ohhh my...bridged modules already...tons of power !!
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Old 4th February 2005, 08:38 PM   #8
AAK is offline AAK  United States
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Thanks for the quick reply. Keep us all posted on your full bridge, and thanks for sharing your work. I'll keep you posted on how things are go on my end. BTW last year in March i spent a few days in Quebec City. I had a great time, a little cold for me being from Florida but I'd go back in a heart beat. Maybe in the summer this time.

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Old 4th February 2005, 08:43 PM   #9
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good, thanks for the good comments.
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Old 19th March 2006, 11:01 PM   #10
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Hi everyones.

I was a bit out of this project, i am mostly a car enthusiast and have way too much projects...

Anyway, i ordered 4 set of PCB of my latest design of this IR amp.

This last one got a microcontroler on each board to monitor the activity, i think i have explained most of this in another thread...

I will let you know how it goes, and will post pictures soon.

thanks

Pat Allen
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