"The Classic-D" - New Class-D Amp from Silicon Chip - Page 2 - diyAudio
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Old 10th November 2012, 07:03 AM   #11
kpimage is offline kpimage  Australia
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Quote:
Originally Posted by alexcp View Post
An interesting part of the reference design is its scalability.
Yes the scalability is a good feature, designed to operate in the range of +/-40-60V.

A supply of +/-57V will produce 150W into 8ohm & 250W into 4 ohm with THD of 1%, but the filter capacitors used are only rated 63V which gets close or past that value with mains variation.

The another feature, is to bridge two modules to get 500W into 8ohms and run them of one of single supply with a transformer rated at 500VA or more.
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Old 12th November 2012, 02:40 AM   #12
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If you add mosfet gate drivers you can get well over 250 watts.
I have a design that will output 750 watts into 2 ohms.
I use the TC4420 mosfet gate drivers with 2 pairs of irfb4227's.
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Old 15th November 2012, 12:56 PM   #13
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Default Mosfet gate drivers

Quote:
Originally Posted by nigelwright7557 View Post
I have a design that will output 750 watts into 2 ohms.
I use the TC4420 mosfet gate drivers with 2 pairs of irfb4227's.

Hi Nigel, can you post a schematic of your circuit?

Interested amps that can drive difficult speakers with low impedance.
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Old 15th November 2012, 01:13 PM   #14
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Originally Posted by kpimage View Post
Hi Nigel, can you post a schematic of your circuit?

Interested amps that can drive difficult speakers with low impedance.
ITS JUST THE APPLICATION NOTE CIRCUIT WITH tc4420 GATE DRIVERS.
I ALSO SCALED THE OVER CURRENT VOLTAGES TO GET MORE POWER.
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Old 27th November 2012, 03:45 PM   #15
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The project is now on Silicon Chip's website.
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Old 19th December 2012, 12:34 PM   #16
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Default D-Class Kit for Sale

Altronics have the kits in stock. Selling for AU$69.95 complete one channel less power supply.

Altronics - K5181 Classic 250W Class D Audio Amplifier Kit
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Old 25th December 2012, 03:33 AM   #17
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Whilst it's nice to post what we see on the forum, this is the parts forum - why not post it in the Class D forum?
The other no-no is that this is copyright material from recent magazine issues! Guys, there are definite rules about that.
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Old 26th December 2012, 09:47 AM   #18
kpimage is offline kpimage  Australia
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Default Follow up

Quote:
Originally Posted by Ian Finch View Post
Whilst it's nice to post what we see on the forum, this is the parts forum - why not post it in the Class D forum?
The other no-no is that this is copyright material from recent magazine issues! Guys, there are definite rules about that.
Originally I posted it under Class D section, but due to the copyright images the Web-Master move it to the parts section.

I've order two kits, and hopefully if I've receive them early 2013, I can start the building the project and post the result.
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Old 10th June 2013, 09:46 AM   #19
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Just built one of these little buggers, assembling the power supply tomorrow.
Its going to be the bass amp for my computer amp. (5xLM3875) and this Class D module.

Got a 2x10inch sealed sub enclosure already built (4ohms total). I expect lots of boom

I am not using the speaker protected for this module, but making one using arduino. It will also control soft on, remote on / auto power on/off.
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Old 10th June 2013, 09:52 AM   #20
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Quote:
Originally Posted by alexcp View Post
An interesting part of the reference design is its scalability. The reference design documents discuss in detail how the same schematic and PCB can be used to build a 25W, 60W, 125W or 250W (into 8ohm) amplifier. The principal difference is the rail voltage (from 2x25V to 2x70V), which requires right power FETs and some other minor adjustments. This means that the SiliconChip design can easily scale up or down as well.
This is true. You just have to change a few resistors and zener diodes to get the different operating voltages.
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