My BIG (2x 1.2kW) amp - diyAudio
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Old 18th September 2003, 10:56 PM   #1
skaara is offline skaara  Slovenia
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Default My BIG (2x 1.2kW) amp

I used two 2kW / 2x74V AC trafos which give me about +- 105V rails when rectified and with 80000F capacitors.
It has 20 output transistors per channel.

It weights about 50-60kg and I its very hard/impossible for one man to carry it around (i once carried it 2 floors down and it was very painful). Its measures are: 48cm wide, 20cm high, 70cm deep

The amplifier was tested with sinus signal with loads down to 2 ohm, it gives:

2x 650W RMS @ 8 ohms
2x 1.2kW RMS @ 4 ohms
2x 2kw RMS @ 2 ohms - after 1 hour of full power in that load it becomes very hot:>


Here are the pictures taken at my friends place when we were preparing stuff for the party.. Unfortunately we couldnt get more speakersD


http://www.elektro-n.com/forum2/atta...?download=1216
http://www.elektro-n.com/forum2/atta...?download=1217
http://www.elektro-n.com/forum2/atta...?download=1218
http://www.elektro-n.com/forum2/atta...?download=1219
http://www.elektro-n.com/forum2/atta...?download=1220
http://www.elektro-n.com/forum2/atta...?download=1221
http://www.elektro-n.com/forum2/atta...?download=1222



Now I want to make a class D amp of that power and smps for it, but until this will happen.... any ideas?
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Old 18th September 2003, 11:10 PM   #2
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looks good, any chance of a peek inside of it?
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Old 19th September 2003, 01:33 AM   #3
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Default i want to see nude .

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Old 19th September 2003, 03:30 AM   #4
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nude??? you mean the amp right in that case, me too...

JojoD
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Old 19th September 2003, 04:31 AM   #5
jleaman is offline jleaman  Belgium
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How do you expect to pull 2kw through that little DINKY power cord. ?
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Old 19th September 2003, 04:33 AM   #6
jleaman is offline jleaman  Belgium
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WOOO a carton of smokes that will make it smoggy in there.

COUGH COUGh. id never want to be in there ..
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Old 19th September 2003, 06:30 AM   #7
subwo1 is offline subwo1  United States
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Hi skaara,

See the link at the bottom of this post for ideas on high power SMPS. Also see My very first Class D pwm (switching) amplifier.
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Old 19th September 2003, 07:26 AM   #8
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by JasonL
How do you expect to pull 2kw through that little DINKY power cord. ?
Probably a standard 10 A cord which means at least 2.4kW here in 240 V Europe. running things a bit high he could probably get that through without too much of a problem.
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Old 19th September 2003, 07:55 AM   #9
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inside pics ?

people drool
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Old 19th September 2003, 08:53 AM   #10
matth is offline matth  United Kingdom
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Looks great, I really like the heatsink layout.
I thought my amp was heavy with 2 x 1Kva tranfos in it but 2 x 2Kva

Come on give us some pics of the guts.

What your mains supply? 2 x 2Kw means over 16.5 Amps even at 100% efficiency on 240v. That cable is rated at 10 Amps max and the inlet on the amp is probably only 6 Amps. I thought I was pushing it on my amp.
You may want to try the large IEC connectors rated at 16 Amp:
RS: 16amp
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