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Old 13th October 2012, 11:19 AM   #11
diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour
Originally Posted by Shelah View Post
....can you help me find a mosfet amplifier that has similar specs as the one in the link?
There are few large lateral mosfet designs anywhere in the last 20 years. They use expensive parts which were not readily available with Vds more than 200V, so serious manufacturers moved to Vertical or HEXFETs many years ago.
The only remaining application is High-end audio and smaller musical instrument amplifiers, even though they have great qualities like bullet-proof self limiting, fair linearity and low Ciss for low base charging current. The reference to the ELEKTOR Crescendo (A large hi-fi amp) is about the most common design available in Europe. Use Google. Donpetru has actually been developing one, like that 2001 design you linked. Perhaps he has more useful leads to follow.

However, if your requirement is for PA, Disco or Pro. work, as you indicated in your previous thread, it needs to be a lot tougher specified to deliver the massive current peaks necessary in that line of application. Hi-fi amplifiers often struggle to deliver the 8R maximum rated power and can't continuously drive lower impedances if required. I note that many DIY builders rate their amplifiers by the power supply voltage without a care about whether they can do what they should because no-one is going to use them beyond 10% of the rating in domestic use. You will need to define your usage, because the cost and complexity is usually quite different for each application.

There is a search button at the top of every DIYAudio page. You can enter "Lateral Mosfet amplifier" for example and select "search threads" option. Obvious answers don't always appear but you can refine the search words and you will turn up some leads and these will find some info. in some unlikely places. Searches are best done by you, otherwise you still have the same problem of needing help at every stage.

If you are going to rely on free information though, it's likely to be very difficult to find that which is reliable or current. Good information, like a good book, is seldom free.
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Old 13th October 2012, 04:31 PM   #12
Shelah is offline Shelah  Zambia
diyAudio Member
Join Date: Oct 2010

this is another amplifier i found after the 360w one was disqualified. does it look good for building and is it mathematically correct to have 5 sets of c5200/a1943 at the output?
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Old 13th October 2012, 05:24 PM   #13
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
you don't need to search the web.
There are many good and very good designs here on the Forum.
Most have been built and tested by the Members.
Most will get good support from the Members.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 13th October 2012, 06:42 PM   #14
diyAudio Member
Join Date: Apr 2010
Location: Coffs Harbour
Originally Posted by Shelah View Post
.....does it look good for building and is it mathematically correct to have 5 sets of c5200/a1943 at the output?
The design you linked to used 7 pairs for its rating but the fact is that we have taken you over this all before. AndrewT has given you reasonable advice to use a forum design as it is clear that you are going to need a lot of assistance. A bare bones schematic means nothing without PCB layout, full documentation and parts lists etc.
Start Here and read the thread carefully from the beginning, ignoring the social chat and later kid stuff.
There are more designs by Apex and others and as you see, others build them and get them working within the specifications the designers lay down. Of course, some say "I like your design, now can you do one for me that does something else?" Now you can only accept what is history or select another design, where possible.
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