Looking For Schematics For...

TomMystery · 10th July 2006, 02:34 PM

Alright, I've been searching the internet for a good DIY amplifier for some time now. While I have found some schematics which appeal to me like the MOFSET Amp off the Elliot Sound Project site, I haven't been able to find exactly what I am looking for.

I am not looking for any modules, I want to build this amp from the ground up.

These are my requirements:
- Around 400W into 4 Ohms
- <1% THD @ 1V
- I would prefer a MOFSET Design
- I would prefer a Class AB Amp

What I have:
- A 52-0-52 toroid @ 1.2 KVA which gives me about 72VDC at roughly 10A per channel (for a stereo amp)
- Enough Caps to make a 100 000 uf power supply.

Any ideas?

richie00boy · 10th July 2006, 03:06 PM

www.ampslab.com
www.aussieamplifiers.com

morpheus82 · 10th July 2006, 04:16 PM

hmm...don't know if it will be good for you but, have you seen the lm4702 from national?seems to have good specs...300w, not 400w but it's simple and...works!

jackinnj · 10th July 2006, 04:40 PM

Quote:

Originally posted by raikkonen
hmm...don't know if it will be good for you but, have you seen the lm4702 from national?seems to have good specs...300w, not 400w but it's simple and...works!

I haven't yet used the LM4702 to drive Lateral MOSFET's -- but I can certainly second RAIKKONEN's enthusiasm for this driver chip -- on my benchtop (not shielded, long power supply leads, RFI all over the place) I have driven about 100 W at 0.01% THD -- and I know that with more care in the layout I can get it down into National's specifications.

The LM4702 has limited current drive capability which lends itself more to LatFets.

Men at Work:

bear · 10th July 2006, 04:54 PM

Check the Borbely site?

http://www.borbelyaudio.com

Not sure he as anything that will run the rail voltage you spec, but given the work and other parts co$t involved in making a real amp, I'd not base everything on the power transformer at hand?

You can certainly bridge his amps for rather significant power, I've tried it myself with a variant of his basic DC coupled design, and to say the least the result was fairly awesome... maybe too much power.

Also, there are a number of threads on here with rather neat and sophisticated schematics/designs discussed and discected in various threads here at DIYaudio.com. Worth a look.

_-_-bear

TomMystery · 11th July 2006, 03:48 PM

The AmpLAB Bi240 design appeals to me, especially because of the quick response time, however paying $90US for the schematics is a little steep.

morpheus82 · 11th July 2006, 03:51 PM

10$ for the board, some for the components and...a free sample from national!much better I think!!

10th July 2006, 02:34 PM	#1
TomMystery diyAudio Member Join Date: Jul 2006	Looking For Schematics For... Alright, I've been searching the internet for a good DIY amplifier for some time now. While I have found some schematics which appeal to me like the MOFSET Amp off the Elliot Sound Project site, I haven't been able to find exactly what I am looking for. I am not looking for any modules, I want to build this amp from the ground up. These are my requirements: - Around 400W into 4 Ohms - <1% THD @ 1V - I would prefer a MOFSET Design - I would prefer a Class AB Amp What I have: - A 52-0-52 toroid @ 1.2 KVA which gives me about 72VDC at roughly 10A per channel (for a stereo amp) - Enough Caps to make a 100 000 uf power supply. Any ideas?

10th July 2006, 03:06 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	www.ampslab.com www.aussieamplifiers.com __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

10th July 2006, 04:54 PM	#5
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	Check the Borbely site? http://www.borbelyaudio.com Not sure he as anything that will run the rail voltage you spec, but given the work and other parts co$t involved in making a real amp, I'd not base everything on the power transformer at hand? You can certainly bridge his amps for rather significant power, I've tried it myself with a variant of his basic DC coupled design, and to say the least the result was fairly awesome... maybe too much power. Also, there are a number of threads on here with rather neat and sophisticated schematics/designs discussed and discected in various threads here at DIYaudio.com. Worth a look. _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

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10th July 2006, 04:16 PM	#3
morpheus82 diyAudio Member Join Date: Oct 2004	hmm...don't know if it will be good for you but, have you seen the lm4702 from national?seems to have good specs...300w, not 400w but it's simple and...works!

11th July 2006, 03:48 PM	#6
TomMystery diyAudio Member Join Date: Jul 2006	The AmpLAB Bi240 design appeals to me, especially because of the quick response time, however paying $90US for the schematics is a little steep.

11th July 2006, 03:51 PM	#7
morpheus82 diyAudio Member Join Date: Oct 2004	10$ for the board, some for the components and...a free sample from national!much better I think!!

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