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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th August 2012, 05:07 PM   #1
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Default First audio DIY project: Class D amp from modules

I planning to start my first DIY audio project, and wants to build a Class D amp.

I thinking about buying two L15D, which I understand is pretty good, from reading here on this forum.
Is these the correct ones?
300W IRS2092 IRFI4019H IRAUDAMP7S Amplifier kit L15D | eBay

Also I guess I need a speaker protection circuit, is this OK?
2-channel Stereo Speaker protection board LED assembled | eBay


The PSU I will build from an 2x33V 250VA trafo and two 10000F capacitors, and two 10A rectifier bridges I have laying around.

Does the PSU need to be regulated?


Do you guys think this will be OK? Do I need some more?
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Old 29th August 2012, 05:51 PM   #2
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It will be ok...but no need to use two bridges..the amp works gr8..and all the best
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Old 29th August 2012, 06:22 PM   #3
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Believe L15D-PRO is same amp but with speaker protection relay built in.
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Old 29th August 2012, 06:49 PM   #4
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Quote:
Originally Posted by russc View Post
Believe L15D-PRO is same amp but with speaker protection relay built in.
you mean this?
New L15D-Pro 300W 4ohm IRS2092 IRFB4019 Mono amplifier kit | eBay

is there any other difference?
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Old 29th August 2012, 06:53 PM   #5
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Quote:
Originally Posted by sweetperfume View Post
It will be ok...but no need to use two bridges..the amp works gr8..and all the best
thanks.
my mistake about the rectifiers :-S
But do the PSU need to be regulated?
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Old 29th August 2012, 06:55 PM   #6
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do NOT buy!!! These "kits" are just too cheap, you'll find their riddled with fake components and will blow up in your face.
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Old 29th August 2012, 07:09 PM   #7
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how much heat will such an amplifier create? Do I need cooling holes in the case?
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Old 30th August 2012, 04:43 AM   #8
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Quote:
Originally Posted by Tekko View Post
do NOT buy!!! These "kits" are just too cheap, you'll find their riddled with fake components and will blow up in your face.
Thats true so far....there kits can be bought for testing purpose and with some little alteration it can work fine...
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Old 30th August 2012, 04:46 AM   #9
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Quote:
Originally Posted by bjorkhaug View Post
thanks.
my mistake about the rectifiers :-S
But do the PSU need to be regulated?
A non stabilized power supply will do the job no need to regulate....and the kits are for short term use...they dont have much capacity to handle the heat with that small heatsink...so just look at how there kits works and in thru there measurements and then build your own amp as per your needs...all the best buddy
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Old 30th August 2012, 05:25 PM   #10
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Other people on the forum rate the Zoe & Along supplied Ebay LJM kits/built up modules just fine so is the criticism aimed at this one seller or at LJM kits in general? After all LJM is a forum member and the L15D kits have excellent reviews on this forum. What is the evidence leading to this criticism? Also, class D is supposed to dissipate little heat, the heatsink size appears comparable to other class d amps and they are only single channel.
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