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Class D Switching Power Amplifiers and Power D/A conversion

1st DIY amp build
1st DIY amp build
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Old 25th March 2019, 11:35 PM   #1
fidel1890 is offline fidel1890
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Default 1st DIY amp build

Hi, I am new to diy audio and thinking about building a 2 channel class D amp. I want roughly 50-100 w per channel. Someone previously suggested a wondom aa-32313. I am not sure what else I need in order to turn this into a stereo receiver.. (power supply, etc?). Does anyone have any suggestions? Build plans, good diy kits or any other recommendations are appreciated.

I am new to diy audio, but I am a mechanical engineer. I have semi decent knowledge of electronics. Things like soldering, designing a sheet metal chassis are not a problem.

Thanks.
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Old 28th March 2019, 01:17 PM   #2
chermann is offline chermann  Austria
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Hi

Welcome here...

your inputs are not much (butgete, amp and then "just" modding, or boards,...) but maybe look and read this threads to get an idea of different way fo an amp:
TPA3116D2 Amp
TDA7492 Amp
Ebay cheap TDA7498 boards
200W IRS2092 Amp for $20

chris
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Old 28th March 2019, 04:28 PM   #3
fidel1890 is offline fidel1890
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Quote:
Originally Posted by chermann View Post
Hi

Welcome here...

your inputs are not much (butgete, amp and then "just" modding, or boards,...) but maybe look and read this threads to get an idea of different way fo an amp:
TPA3116D2 Amp
TDA7492 Amp
Ebay cheap TDA7498 boards
200W IRS2092 Amp for $20

chris
Thanks, some of what Iím reading online / YouTube makes building a Class D amplifier sound incredibly easy... almost suspiciously easy.

YouTube

This link above for example, it seems pretty legitimate. But almost as if itís too easy / cheep? Or is this really all there is to it?
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Old 28th March 2019, 04:34 PM   #4
mikejennens is offline mikejennens  United States
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1st DIY amp build
Quote:
Originally Posted by fidel1890 View Post
Hi, I am new to diy audio and thinking about building a 2 channel class D amp. I want roughly 50-100 w per channel. Someone previously suggested a wondom aa-32313. I am not sure what else I need in order to turn this into a stereo receiver.. (power supply, etc?). Does anyone have any suggestions? Build plans, good diy kits or any other recommendations are appreciated.

I am new to diy audio, but I am a mechanical engineer. I have semi decent knowledge of electronics. Things like soldering, designing a sheet metal chassis are not a problem.

Thanks.
When you say "building an amp" are you referring to actually soldering the components to the circuit board or are you referring to getting the assembled amp, power supply, pre-amp, etc.?
Both are a lot of fun and very doable but are different approaches to a similar outcome. I've done both ways and really enjoy the projects.
Mike
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Old 28th March 2019, 04:44 PM   #5
fidel1890 is offline fidel1890
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Originally Posted by mikejennens View Post
When you say "building an amp" are you referring to actually soldering the components to the circuit board or are you referring to getting the assembled amp, power supply, pre-amp, etc.?
Both are a lot of fun and very doable but are different approaches to a similar outcome. I've done both ways and really enjoy the projects.
Mike
Iím really not sure which direction to go. Basically I want to build a stereo receiver. To run off 115VAC standard household power. 100+ watts per channel. Preferably less than $400. I have the ability to follow any instruction in terms of soldering, and putting components together. But Iím not knowledgeable in terms of electrical engineering enough to design one on my own. Designing a chassis is pretty easy for me, so thatís one thing Iím not too concerned with.

Iíll take any recommendations you have.
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Old 28th March 2019, 05:05 PM   #6
mikejennens is offline mikejennens  United States
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I'm using a Hi-FiMeDIY T3S amp and an SMPS300R power supply at the moment. I love it. I don't have a tuner integrated, so it's not a "receiver," but I'm sure there are tuners available. Other than the amp and power supply, you'll need a power switch, power cord, volume control, speaker terminals, and RCA input jacks. It was a fun project and it sounds great.
I run it from a DAC connected to my computer, all through a 10-band graphic equalizer. It's a very simple system, and I love it. I ordered a pre-amp with volume, bass, treble, and balance to try with it.
One issue to watch for with the Wondom and the like is the power rating. Many times it's listed "@10% THD." Other than that, they can be a part of a fun decent system.
I can post more photos of mine if you'd like, but here's a simple one.
ENJOY YOUR PROJECT, whichever direction you choose,
Mike

HiFiMeDIY Amp
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File Type: jpg HiFiMeDIY Amp.jpg (281.2 KB, 79 views)
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Old 28th March 2019, 05:08 PM   #7
fidel1890 is offline fidel1890
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Quote:
Originally Posted by mikejennens View Post
I'm using a Hi-FiMeDIY T3S amp and an SMPS300R power supply at the moment. I love it. I don't have a tuner integrated, so it's not a "receiver," but I'm sure there are tuners available. Other than the amp and power supply, you'll need a power switch, power cord, volume control, speaker terminals, and RCA input jacks. It was a fun project and it sounds great.
I run it from a DAC connected to my computer, all through a 10-band graphic equalizer. It's a very simple system, and I love it. I ordered a pre-amp with volume, bass, treble, and balance to try with it.
One issue to watch for with the Wondom and the like is the power rating. Many times it's listed "@10% THD." Other than that, they can be a part of a fun decent system.
I can post more photos of mine if you'd like, but here's a simple one.
ENJOY YOUR PROJECT, whichever direction you choose,
Mike

HiFiMeDIY Amp
Thanks for the advice... hereís an example of how new at this I am: whatís a tuner?
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Old 28th March 2019, 05:10 PM   #8
mikejennens is offline mikejennens  United States
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Quote:
Originally Posted by fidel1890 View Post
Thanks for the advice... hereís an example of how new at this I am: whatís a tuner?
A tuner is what you use to pull in a radio station. If you don't listen to the radio and don't want to add a tuner, you'd technically be building an amp.
Are you in the USA?
Mike
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Old 28th March 2019, 05:13 PM   #9
fidel1890 is offline fidel1890
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Ha, yeah, a tuner. I am not too interested in radio. But I imagine it’s not too hard to integrate. And yes I am in the USA.
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Old 28th March 2019, 05:19 PM   #10
mikejennens is offline mikejennens  United States
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1st DIY amp build
Do you already have speakers?

What would you be using for a source: computer, CD player, MP3 player, etc.?

I'll gladly share as much of my experience as I can, but I'm no engineer and was an electronic tech MANY years ago. Also, what sounds good to me, might not sound good to someone else.
I have seen a lot of great advice on this forum, but it can easily go over my head. It can be overwhelming to the point of desperation sometimes. I'm a very simple guy and I don't judge a new guy to the hobby for not knowing something. It's a hobby, and hobbies should be enjoyed and shared.
Mike
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