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Old 22nd December 2008, 10:27 PM   #71
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You have the REAL book even. perhaps HH stole from that..


OS
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Old 22nd December 2008, 11:00 PM   #72
lineup is offline lineup  Sweden
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The book is one Babani from 1991
by R. Penfold

http://www.babanibooks.com/
Quote:
0 85934 222 0
BP277 High Power Audio Amplifier Construction, R. Penfold
3.99
Buy Amazon:
High-Power-Audio-Amplifier-Construction
http://www.amazon.com/High-Power-Aud.../dp/0859342220
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Old 23rd December 2008, 06:35 AM   #73
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Here is the real >300 watt into 4 ohm version I have never posted before.

I don't make money with it so it really does not matter. What I will say is that I have modified the CCS to that Alex has suggested and it works pretty nicely. Thanks Alex hope you don't mind.

I have Gerbers of the PBCs if anyone is interested. I do not make or sell kits, PCBs, transformers or components, you may do with the circuit as you please.

This one has been made for my friend running the local country club for New Year's eve party, eight channels - installed and cranked up and tested for 5 hours - not bad at all.

I built mono blocks into my standard class A amp very simple case. Heat sinks are for our standard rectifier extrusions used in 500 Amp chargers @ 0.15w/deg C times 4.

Amps are placed at each Altec Lansing 22 inch with horn mid and horn tweeter- Connections to source are mono via RF audio extenders, to the mixing console. These speakers and amps are permanent installations near the ceiling about 3.5 -4 meters high.

The hall is about 60 x 40 m and running all is ******* deafening but he is expecting around 600 people which will change matters dramatically.

You can change this amp, make it better or worse, do whatever you guys please - it is now in the public domain.

Kindest Regards

Nico

Link is below:
http://digisec.co.za/ras/music/300w%20MOSFET%20AMP.pdf
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Old 23rd December 2008, 03:01 PM   #74
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hi nico
what is the slewrate of the amp ?
and damping factor
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Old 23rd December 2008, 03:20 PM   #75
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SR is about 40V/uS and damping factor around 400. Using a quick calculations. I do not have the amps anymore they are installed.

Nico
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Old 25th June 2011, 12:09 PM   #76
masood is offline masood  India
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please show images of nico ras cicuit
thanks
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Old 25th June 2011, 12:15 PM   #77
lineup is offline lineup  Sweden
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Quote:
Originally Posted by masood View Post
please show images of nico ras cicuit
thanks
This is image of 100 WAtt MOSFET, at Nico Ras homepage
.
Click the image to open in full size.
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Old 26th June 2011, 04:44 AM   #78
AKSA is offline AKSA  Australia
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That would sound very nice indeed.... I like it, hats off Nico.....

Hugh
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Old 9th July 2011, 04:00 PM   #79
masood is offline masood  India
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dear lineup,
thanks to send nico ras100watt amp.circuit but i want 300watts amplifier usin npn and pnp mosfets.thanking you masood
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Old 14th October 2011, 07:23 PM   #80
RaviRao is offline RaviRao  India
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Hi Nico,
Looks very interesting and I want to build the 100W amp with your upgrades. Will it be a problem to mail the PCB and the construction details to my mail ID or just share it here on the forum. Would like to have your response as I would like to restore my old Mini0Crescendo Amps which have failed ( After 20 Years -the olde trusty SK135/SJ49....was a great amp till it lasted)
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Ravi Kumar Rao
ravi.rao.kumar@gmail.com
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