ucd 25 watts to 1200 watts using 2 mosfets - Page 233

CPX · 17th August 2012, 03:46 PM

Something VERY bad is happening there

.I didn't have this problems even on test board.Post board layout.

sweetperfume · 17th August 2012, 03:53 PM

Quote:

Originally Posted by CPX

Something VERY bad is happening there

.I didn't have this problems even on test board.Post board layout.

adjustments were made as said by thienchay

CPX · 17th August 2012, 03:56 PM

I know this board,i allready commented on it.
Distance between output transistors and buffering capacitors is huge!!,but it should work at 1 or 2 amps.You should remake it for full power.

sweetperfume · 17th August 2012, 04:04 PM

Quote:

Originally Posted by CPX

I know this board,i allready commented on it.
Distance between output transistors and buffering capacitors is huge!!,but it should work at 1 or 2 amps.You should remake it for full power.

i dint get u.....exactly what u wanna say,,,the capacitors on the supply rails????????

at fulll power means??????????/

CPX · 17th August 2012, 04:15 PM

Yes,those capacitors,they should be very close to output transistors.And ground is very bad,it has loops and and is it long and thin.You can somewhat fix this by using a ground plane on the other side conectata in 10 points butthe capacitors have to be moved.

sweetperfume · 17th August 2012, 04:20 PM

Quote:

Originally Posted by CPX

Yes,those capacitors,they should be very close to output transistors.And ground is very bad,it has loops and and is it long and thin.You can somewhat fix this by using a ground plane on the other side conectata in 10 points butthe capacitors have to be moved.

can this be the cause for my problem....even with no loads...i got distorted square wave...if i would have got distorted sine wave i would have said there is ground problem...i used 33uh coil and 0.47uf cap for output filtering

sweetperfume · 17th August 2012, 04:23 PM

Quote:

Originally Posted by CPX

You can somewhat fix this by using a ground plane on the other side (conectata in 10 points butthe capacitors have to be moved).

what does this means????????

manojtm · 17th August 2012, 04:25 PM

Hi CPX

EMI 4.3mV only no problem for 2CH

see my DSO Picture

Regards
MANOJ

sweetperfume · 17th August 2012, 04:28 PM

Quote:

Originally Posted by manojtm

Hi CPX

EMI 4.3mV only no problem for 2CH

see my DSO Picture

Regards
MANOJ

the freq response is before output inductor or after output inductor

CPX · 04:36 PM

Quote:

Originally Posted by manojtm

Hi CPX

EMI 4.3mV only no problem for 2CH

see my DSO Picture

Regards
MANOJ

Where is that measured..on the supply or with the probe shorted at a certain distance?
Please post a picture of your amplifier(of both modules)
Please post your syncronizing schematic or explian how you did it.
Thanks.

17th August 2012, 03:46 PM	#2321
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	Something VERY bad is happening there.I didn't have this problems even on test board.Post board layout.

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17th August 2012, 03:56 PM	#2323
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	I know this board,i allready commented on it. Distance between output transistors and buffering capacitors is huge!!,but it should work at 1 or 2 amps.You should remake it for full power.

17th August 2012, 04:15 PM	#2325
CPX diyAudio Member Join Date: Nov 2004 Location: Cluj	Yes,those capacitors,they should be very close to output transistors.And ground is very bad,it has loops and and is it long and thin.You can somewhat fix this by using a ground plane on the other side conectata in 10 points butthe capacitors have to be moved.