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Old 14th April 2006, 04:18 PM   #1
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Default D REX1200 schematics

Hi everyone,

I got D REX1200 class d amplifier schematics (subwoofer car amplifier):
SMPS 12V---60V 1.2kW
class d amplifier : 600WRMS/4 ohms
1200WRMS/2ohms

Iy you're interested let me know !
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Old 14th April 2006, 04:23 PM   #2
Eva is offline Eva  Spain
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I'm interested. I've had to repair a couple of these amplifiers and I remember some black big potted box whose contents I want to know (if I'm not mistaking models).
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Old 14th April 2006, 04:58 PM   #3
edl is offline edl  Hungary
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Hi,

You wrote that the PSU rails are 60V.
600W on 4ohm or 1200W on 2ohm requires 140Vpp, so the rails need to be about 280V.
Anyway I am so interested, shall you upload the documentation?

Thanks, regards,
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Old 14th April 2006, 05:08 PM   #4
Eva is offline Eva  Spain
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In the first batches of these amplifiers, the internal supply voltage was around 75V while PSU capacitors were just 63V units. That caused some capacitor failures from time to time (I replaced them with 80V types). Also, if I remember properly, the output stage is a full bridge with 2 n-channel and 3 p-channel TO-220 devices paralleled on each leg, and output current is sensed through small and thick shunts, so rail efficiency should be very high. An HIP4080 was used as a driver if my memory doesn't fail.
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Old 16th April 2006, 03:10 AM   #5
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Yes , i get intresting .
I try to make a Class-d amp for car using.
But I still get some question in desinging.
So , could you send me the circuit to me ??
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Old 17th April 2006, 12:51 AM   #6
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Hi alexclaire !!
Please could you send me diagram schematic.
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Old 17th April 2006, 08:38 AM   #7
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Default DREX 1200

here are the files...
Attached Images
File Type: gif drex1200_amp_1g.gif (66.0 KB, 828 views)
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Old 17th April 2006, 08:43 AM   #8
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Default DREX1200

and...
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File Type: gif drex1200_smps_1g.gif (68.8 KB, 770 views)
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Old 17th April 2006, 08:59 AM   #9
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Do you post here ,or send me a schematic of this amplifier not smps.
Thx.
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Old 17th April 2006, 09:30 AM   #10
kartino is offline kartino  Indonesia
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I think he post only half pages, the first is the Amp, the second is the smps.

Is he realize that?
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