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Old 9th June 2012, 09:33 AM   #1971
manojtm is offline manojtm  India
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hi cpx
my old design the same problem found. what i did was 10ohm connect heatsink with GND main and all the gnd connected to main GND(signal&spk)and +&-supply through 10uH coil

RGDS
MANOJ
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Old 9th June 2012, 11:25 AM   #1972
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hi cpx

look my attch. file
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Old 9th June 2012, 01:31 PM   #1973
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Ok,thanks alot for the schematic
But what to do if i must use only one heatsink?
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Old 9th June 2012, 02:08 PM   #1974
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Im have seen irs2092 modules with 1 or 2 chanels with one heat sink and even no ground plane like irdaamp7 which work ok,how is that posble,is
irs2092 or pre filter feedback less susceptible to rf noise?

Last edited by CPX; 9th June 2012 at 02:14 PM.
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Old 9th June 2012, 02:30 PM   #1975
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hi cpx

10E with 2KPf parallel connected to GND and use small ferrite with 3turns connected from main GND to signal gnd noise will reduce.

cpx my old thread i mentioned ground plane is creating problem for me but nobody supported.avoid ground plane on MOSFET & Filter side OR do not use ground plane,its my opinion other side i don't know.

RGDS
Manoj
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Old 9th June 2012, 02:53 PM   #1976
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Default triell amp 3200 d

triell dclass anyone have its schematic pcb can be made but some parts
can not be seen clearly

warm regards
andrew lebon
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File Type: jpg amplificador digital de 3200 wats 08 06 2012.jpg (35.5 KB, 804 views)
File Type: jpg costa do amplifiador digital de 3200 wats.jpg (289.6 KB, 795 views)
File Type: jpg DSC07047.jpg (543.7 KB, 729 views)
File Type: jpg DSC07051.jpg (854.0 KB, 641 views)
File Type: jpg DSC07052.jpg (962.8 KB, 331 views)
File Type: jpg DSC07060.jpg (640.6 KB, 330 views)
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Old 9th June 2012, 02:54 PM   #1977
manojtm is offline manojtm  India
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hi cpx

my new design (you said its BAD PCB Design) i used yellow/white core with 30Turns 16SWG wire and 3x IRFP240, core temp. is 35-38deg.c MOSFET Temp. 38-40deg.c low EMI
tested voltage with +42V,-42V DC load 5E 50W resistor stead @full volume for 1hr.
i never taken THD measure,DC offset is -18mV to -24mV.
everyone said IRFP240 & yellow/white core not good for class D. My curiosity is practically what happen in this components
IRF240 is Qg is affordable rate clamp diode not good solving this connect good diode externally,my way like this

RGDS
Manoj
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Old 9th June 2012, 03:03 PM   #1978
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hi manojtm
greetings how does your yellow core not heat just finished my dclass 3 pairs
90n20 have to use 2 cores together sendust coolmu cores yellow cores dont work

warm regards
andrew lebon
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Old 9th June 2012, 03:06 PM   #1979
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Default 2 cores together

for HIGH POWER you can see 2 sendust cores and i have made this amp clone
one core heats up
warm regards
andrew lebon
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Old 9th June 2012, 03:08 PM   #1980
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Quote:
triell dclass anyone have its schematic pcb can be made but some parts
can not be seen clearly
hi andrew

i think its your first schematic used with 2x IRFP250

RGDS
Manoj
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