200W Lateral Mosfet Amplifier

macgyver · 7th July 2003, 06:24 PM

Hello!
I have 2*38V / 550VA transformer. I'm plannig to build this amplifier http://www.aussieamplifiers.com/lateral.htm . How much power I will get in to 4ohm?

Freddie · 7th July 2003, 06:33 PM

More than 200W RMS I think, if you use one transformer per channel..

macgyver · 7th July 2003, 06:46 PM

Thanks for your reply. I think so too. I'm plannig to drive this subwoofer http://www.linkwitzlab.com/thor-intro.htm .
So I build two of Lateral Mosfet Amplifiers and bridge them. I know the problem is too small transformer but I will try it :P
How much would I get bridged into 8ohm with that transformer?
I also have two 2*40/150VA transformers. Can I use them with the "main" transformer (2*38/550VA)? Any problems?

millwood · 7th July 2003, 07:03 PM

a 38 rms will get you 53vdc on the rail. Knock 10v off for ops inefficiencies and power supply droop, 40v peak on the load is reasonable. That translates into 140W RMS output on an 8 ohm load.

bridging will double the output in theory. also, don't forget about power dissipation on the output devices (~80w).

peranders · 7th July 2003, 07:35 PM

A trick to get a little bit more power is to drive the gates of the power mosfet's 5-10 volts above the supply rails. How? Feed the driver with 10-20 volts more than the mosfet's. The easiest way to do this is simply to add voltage from a small transformer at each rail. Don't forget to add diodes from the VAS stage to the power rails. This is for a cleaner clipping. When clipping accur the driver won't saturate.

With this trick you can get up to 370 Watts or so, 2-3 dB if we sound level.

jleaman · 7th July 2003, 08:49 PM

here is my lateral amplifier im selling it too.. i need to start my av800's

http://24.69.72.2/view_album.php?set_albumName=album06

7th July 2003, 06:24 PM	#1
macgyver diyAudio Member Join Date: Aug 2002 Location: Finland	200W Lateral Mosfet Amplifier Hello! I have 2*38V / 550VA transformer. I'm plannig to build this amplifier http://www.aussieamplifiers.com/lateral.htm . How much power I will get in to 4ohm?

7th July 2003, 06:46 PM	#3
macgyver diyAudio Member Join Date: Aug 2002 Location: Finland	more questions... Thanks for your reply. I think so too. I'm plannig to drive this subwoofer http://www.linkwitzlab.com/thor-intro.htm . So I build two of Lateral Mosfet Amplifiers and bridge them. I know the problem is too small transformer but I will try it :P How much would I get bridged into 8ohm with that transformer? I also have two 240/150VA transformers. Can I use them with the "main" transformer (238/550VA)? Any problems?

7th July 2003, 07:35 PM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	A trick to get a little bit more power is to drive the gates of the power mosfet's 5-10 volts above the supply rails. How? Feed the driver with 10-20 volts more than the mosfet's. The easiest way to do this is simply to add voltage from a small transformer at each rail. Don't forget to add diodes from the VAS stage to the power rails. This is for a cleaner clipping. When clipping accur the driver won't saturate. With this trick you can get up to 370 Watts or so, 2-3 dB if we sound level. __________________ /Per-Anders (my first name) or P-A as my friends call me

7th July 2003, 08:49 PM	#6
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	here is my lateral amplifier im selling it too.. i need to start my av800's http://24.69.72.2/view_album.php?set_albumName=album06 __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

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7th July 2003, 06:33 PM	#2
Freddie diyAudio Member Join Date: Oct 2000 Location: Sweden	More than 200W RMS I think, if you use one transformer per channel..

7th July 2003, 07:03 PM	#4
millwood Account Disabled Join Date: Apr 2003 Location: US	a 38 rms will get you 53vdc on the rail. Knock 10v off for ops inefficiencies and power supply droop, 40v peak on the load is reasonable. That translates into 140W RMS output on an 8 ohm load. bridging will double the output in theory. also, don't forget about power dissipation on the output devices (~80w).

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