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Old 24th September 2008, 01:56 AM   #41
BWRX is offline BWRX  United States
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Default Re: Re: Tripath Chips

Quote:
Originally posted by mhouston
I thought the Tripath was Class T?
Class "T" is marketing mumbo jumbo. There is no such class. Amplifiers that utilize Tripath chips are class d.

There are tons of ICs one can use to build a class d amp. Search the websites of well known manufacturers - TI, ADI, ST Micro, National Semi, etc. If you want to dig deeper, search this forum for a while. There are some older threads that get pretty technical regarding design.
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Old 24th September 2008, 10:01 AM   #42
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Quote:
Originally posted by Pashley


There's one at http://sound.westhost.com/articles/pwm.htm. It was written by someone from Coldamp, a vendor of class-D amp modules.

For another module vendor's take, go to http://www.hypex.nl/ and click on "technology".

The link is a no show!
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Old 24th September 2008, 10:40 AM   #43
Pashley is offline Pashley  Canada
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Quote:
Originally posted by mhouston



The link is a no show!
Sorry, the period I typed after the link screwed it up. Works without the period

http://sound.westhost.com/articles/pwm.htm
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Old 24th September 2008, 10:44 AM   #44
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Can you build your own class D from scratch? Any schematics.
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Old 24th September 2008, 11:10 AM   #45
Pashley is offline Pashley  Canada
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Quote:
Originally posted by mhouston
Can you build your own class D from scratch? Any schematics.
Tripath make class-D amps on chips. You can get development boards from them. Companies like 41Hz.com sell kits for Tripath-based amps.

Quite a few of the big semiconductor companies -- at least TI, Cirrus Logic, Analog Devices, and National -- have class D products. Some are amp-on-a chip, others are controllers that expect external transistors to do the heavy work. Freescale (Motorola's embedded CPU business spun off into a separate company) have a controller that does six channels.
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Old 25th September 2008, 02:22 AM   #46
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you can make chip based amps from scratch easily. discrete amps are much more difficult. there were some made in the 70's. they were only mildly successful. the earliest ones had very low switching frequencies of about 40-50khz. board layout is one of the biggest challenges in discrete designs.
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Old 25th September 2008, 10:34 PM   #47
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Default Re: Class D amps - chips/modules

Quote:
Originally posted by mhouston
Is there a single Class D chip or module I can purchase, commercially, to make a complete amp from?

If so, from a musical point of view, what is the best chip or module?

You can try this website. www.amplifier.co.uk

Have heared that this amp was put up against some Krell monoblocks driving Wilson Watts and it blew the Krells away.
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Old 25th September 2008, 11:16 PM   #48
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Great link, thanks.
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Old 6th January 2009, 03:12 AM   #49
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What is a Pulse Width Modulator? correct me if i spelt it wrong? i'm currently having some issues with a class D amp my self.
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Old 12th January 2009, 11:57 AM   #50
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Default class D. Is it hifi?

Would be interested to hear comments on this article:

http://www.hificritic.com/downloads/Class-D.pdf

Anthony
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