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Old 17th November 2012, 02:21 PM   #1
samp78 is offline samp78  United Kingdom
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Default 400 Watt in 8ohms/ 800 watt in 4 Ohms

Hi, don't know if this is already a thread or not? But I'm looking for a 400 Watt into 8 Ohms Or 800 watt into 4 ohms MOSFET amp preferably not too high voltage. This is not my first electronic project however it is my first high power project and if anyone has a design to suggest, or some advice to offer please don't hesitate to throw them my way. Thanks in advance

Sam
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Old 17th November 2012, 02:36 PM   #2
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Look for a BTL (bridged) amp that runs from a single 60-70V psu.

That will get you 800W into 4 ohms without requiring the high rail voltages of the commonly used amplifier topologies.
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Old 17th November 2012, 02:43 PM   #3
samp78 is offline samp78  United Kingdom
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Thanks Tekko, I will consult Google, have you got any designs you could suggest?
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Old 17th November 2012, 02:50 PM   #4
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Try Holton..He has 400w into 8 Ohms and 800w into 8 Ohms also.
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Old 17th November 2012, 03:07 PM   #5
samp78 is offline samp78  United Kingdom
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I have found a 200watt amp kit on CPC, so if I got two of these I could then bridge them yes? What are the risks of bridging? I know to invert one signal so it 180 degrees out of phase
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Old 17th November 2012, 03:13 PM   #6
samp78 is offline samp78  United Kingdom
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scratch that it is 200 watt @ 4 Ohms (Music Power) Not RMS
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Old 18th November 2012, 11:13 PM   #7
samp78 is offline samp78  United Kingdom
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Hi Ricdelros, could you give me a link to said amp?
Thanks
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Old 19th November 2012, 01:13 AM   #8
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Holton AV800 is actually a 450w into 8 Ohms, AV1000 is actually 550w in 8 Ohms..Links are scattered in the internet..try these.

diyaudio.com/forums/solid-state/164531-another-one-build-av800-av1000.html
diyaudio.com/forums/solid-state/19903-holton-av800-schematic.htm

If it's not satisfied, drop me a mail to send you some compiled.. Here, there is not
enough space to do this.

Rick

Last edited by Ricdelros; 19th November 2012 at 01:15 AM.
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Old 19th November 2012, 01:36 AM   #9
CBS240 is offline CBS240  United States
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You should consider a balanced amplifier circuit, i e full bridge output stage. This is not exactly the same as two seperate single end amplifiers driven at 180 degrees and bridged. Search for balanced amplifier circuits. Note that although the voltage is half, the power supply must have twice the filter capacitance to handle the full bridge output stage.
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