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-   -   400 Watt in 8ohms/ 800 watt in 4 Ohms (http://www.diyaudio.com/forums/solid-state/223753-400-watt-8ohms-800-watt-4-ohms.html)

samp78 17th November 2012 02:21 PM

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

Tekko 17th November 2012 02:36 PM

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.

samp78 17th November 2012 02:43 PM

Thanks Tekko, I will consult Google, have you got any designs you could suggest?

Ricdelros 17th November 2012 02:50 PM

Try Holton..He has 400w into 8 Ohms and 800w into 8 Ohms also.

samp78 17th November 2012 03:07 PM

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

samp78 17th November 2012 03:13 PM

scratch that it is 200 watt @ 4 Ohms (Music Power) Not RMS

samp78 18th November 2012 11:13 PM

Hi Ricdelros, could you give me a link to said amp?
Thanks

Ricdelros 19th November 2012 01:13 AM

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

CBS240 19th November 2012 01:36 AM

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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