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Class D Switching Power Amplifiers and Power D/A conversion

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Old 30th July 2013, 10:19 AM   #431
manojtm is offline manojtm  India
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Hi,

My new dual layer work,not completed

any suggestions pls

Regarding
MANOJ
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Old 30th July 2013, 01:12 PM   #432
stewin is offline stewin  Kenya
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nice work. decided to go smd.
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Old 31st July 2013, 12:18 AM   #433
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Originally Posted by manojtm View Post
Hi,

My new dual layer work,not completed

any suggestions pls

Regarding
MANOJ
Nice all in one layout.

You decided to go SMD, since there's a lot of space maybe you should include totem pole buffer? and TO-247 mosfets? Gate drive should be 1/2W type. So that the DIYers can use higher current capable mosfets.

Also bridge rectifier is insufficient for high power. And the parallel relay for speaker protect is not good for class D because they will not turn on/off simultaneously. The speaker should be connected to ground when the relay is off so that when there's DC out and an arc is formed it will be redirected to ground and not to the speaker. Speaker DC protection with relays

Also put various LED indicators for easier troubleshooting.
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Old 31st July 2013, 05:21 AM   #434
manojtm is offline manojtm  India
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Hi Jlister,

Thank you for your good information regarding speaker protect. i will change the circuit and i feel relay paralleling not a big issue, i used a mosfet for driving relays(15Ax2 or 20Ax2).

High drive and inverter using normal IC(300mil)with base(for easy service) not a SMD one

Quote:
nice work. decided to go smd.
Thank you stewin

Regards
MANOJ
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Old 1st August 2013, 06:23 PM   #435
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hi all pictures of the smps

i added the primary turns so as to cool the outputs . i pushed it a bit hard without a heatsink both for the outputs ,the 7815,and the diodes rbv5006 and the mur1560 except a small heatsink to the mje350
Great work Stewin! Those pcbs look awesome, you've come a long way for sure.
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Old 1st August 2013, 07:50 PM   #436
stewin is offline stewin  Kenya
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Great work Stewin! Those pcbs look awesome, you've come a long way for sure.
thanks man and welcome back . a much thanks also to GOD and the diy world for the support.
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Old 3rd August 2013, 11:33 AM   #437
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hello sir manoj .. can u pls share ur aud 1000 ??
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Old 5th August 2013, 06:17 AM   #438
manojtm is offline manojtm  India
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Quote:
hello sir manoj .. can u pls share ur aud 1000 ??
Hi Aman,

obviously i will do but it was an old carrier based design huge EMI and little noise.delta sigma design is good.

Regards
MANOJ
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Old 5th August 2013, 06:20 AM   #439
stewin is offline stewin  Kenya
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hi manoj have you ever connected 4 aud600 amps with a single power supply(same power supply e.g one +/-75 for the 4 chanels )? and did they work perfectly even though one channel was disconnected from load/speaker?

ucd 25 watts to 1200 watts using 2 mosfets
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Old 5th August 2013, 06:37 AM   #440
manojtm is offline manojtm  India
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Quote:
hi manoj have you ever connected 4 aud600 amps with a single power supply(same power supply e.g one +/-75 for the 4 chanels )? and did they work perfectly even though one channel was disconnected from load/speaker?
Hi,

AUD600 rev1.1 x 3Nos(AUD600 amp and AUD600 power) connected with DC +/- 72V /20A(AC 52v-0-52v/20A) supply rail no problem found.

Regards
MANOJ
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