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Author Topic: anyone ever build any small class D projects?  (Read 5355 times)

duclon

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anyone ever build any small class D projects?
« on: July 09, 2007, 03:37:51 PM »
I'd like to experiment with a class D design, but I can find anything that is simple or small. Do they exist, i mean any designs for low end or lower power class D amps?
I would be cool to see anything anyone on here has built that is Class D.
Mike

teemuk

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Re: anyone ever build any small class D projects?
« Reply #1 on: July 09, 2007, 06:06:54 PM »
I remember Tripath used to make some chips designed for digital audio applications. They call their technology class-T and I know nothing about that except that it's not ordinary PWM. More info at: http://www.tripath.com/audio.htm
« Last Edit: July 09, 2007, 06:09:35 PM by teemuk »

duclon

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Re: anyone ever build any small class D projects?
« Reply #2 on: July 09, 2007, 08:43:44 PM »
Well, I have found a couple chips that are class D with some basic layouts in the spec sheet. the thing that attracts me is the low heat. there are a couple amp makers that use that technology and the amps are really nice. Both guitar and bass amps. they are able to put 100 to 300 watt amps in small combos. I was just curious if there were any designs for lower end ones out there or if anyone had built something like that in the 25 to 50 watt range.
thanks for the reply.

jfetter

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Re: anyone ever build any small class D projects?
« Reply #3 on: July 11, 2007, 05:15:10 PM »
I have used this eval board/kit to drive a "red fang". Veryy loud.
    http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=UAM2


I have not used this new one:....bridged 50w -> 3ohm
                     http://www.analog.com/en/prod/0,,765_1075_AD1994,00.html



My new project is using a jfet (fetzer) preamp and a dsPic33f dsp for a one chip instrument amp. It is in the software & parts procurement stage. I'm using an Analog Devices 100ksample A2D with a "ucd" dsp "in-the-loop" design. its fun anyway.


duclon

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Re: anyone ever build any small class D projects?
« Reply #4 on: July 13, 2007, 01:15:52 PM »
I have used this eval board/kit to drive a "red fang". Veryy loud.
    http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=UAM2


I have not used this new one:....bridged 50w -> 3ohm
                     http://www.analog.com/en/prod/0,,765_1075_AD1994,00.html



My new project is using a jfet (fetzer) preamp and a dsPic33f dsp for a one chip instrument amp. It is in the software & parts procurement stage. I'm using an Analog Devices 100ksample A2D with a "ucd" dsp "in-the-loop" design. its fun anyway.



i saw the top one a few weeks back, The SMT kind of scared me off, but i think I may try it. It looks like a nice small amp for a combo.

jfetter

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Re: Ramsey class D
« Reply #5 on: July 13, 2007, 02:49:38 PM »
the IC is "presoldered", you have to install the caps and resistors- not too hard.
Bruce

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Re: anyone ever build any small class D projects?
« Reply #6 on: July 14, 2007, 01:59:53 PM »
Does anyone know what chip the UAM2 is using? I cannot tell from the Ramsey site.

duclon

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Re: anyone ever build any small class D projects?
« Reply #7 on: July 14, 2007, 02:31:01 PM »
Does anyone know what chip the UAM2 is using? I cannot tell from the Ramsey site.
It looks like it's a TPA3001D1
http://www.ramseyelectronics.com/downloads/manuals/UAM2.pdf
« Last Edit: July 14, 2007, 02:34:42 PM by duclon »

duclon

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Re: Ramsey class D
« Reply #8 on: July 14, 2007, 02:33:10 PM »
the IC is "presoldered", you have to install the caps and resistors- not too hard.
Bruce
Cool, i've got one coming. Looks like a nice little amp.

jfetter

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Re: anyone ever build any small class D projects?
« Reply #9 on: October 18, 2007, 08:44:05 AM »
How did it turn out?

lefizz

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Re: anyone ever build any small class D projects?
« Reply #10 on: October 18, 2007, 01:16:00 PM »
I am in the middle of building a class D project. It started off with a 41hz.com amp32, which sounded great but simply wasnt loud enough for the application, for home use it would have been excellent. That hasnt been swapped out and a Amp11, over a 70 watts 0.003 % THD into 4 ohm. Thats should be loud enough and all runs off a couple of SLA batteries.