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Old 6th September 2013, 03:23 PM   #1
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Default Small class D inside the PC cabinet

This is a self designed Class D amplifier intended to be used inside the PC cabinet, from the +12V and -12V lines of the PC SMPS. It has been done using components at hand usually in my job. For play music for Internet streaming, is sufficient. Loaded with cheap 4R speaker.
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Old 6th September 2013, 04:12 PM   #2
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Very cool, but a question for you - isn't the -12V rail in a computer PSU quite low power? I seem to recall it's for getting the pc out of standby and as such has stuff all current capability... Happy to be corrected as I'm working from old memories of a project I researched once.

I wish my veroboard builds were that neat!
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Old 6th September 2013, 04:15 PM   #3
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On reflection I may be thinking about the -5 rail.

Off a googling we go for clarity...

Last edited by aspringv; 6th September 2013 at 04:17 PM. Reason: clear meaning for flippancy
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Old 6th September 2013, 04:17 PM   #4
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My supply is capable of source up to 1/2 amper, but changing the diodes (1A) and the electrolytics in the -12V rail it performs well. Don't forget that it is for background music only, it is currently driving 4" 4R small speakers. I didn't search high power nor high fidelity, it is made with things at hand in the job, and made while boss isn't present‼ ;-)
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Old 9th September 2013, 12:47 PM   #5
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No opinions??? No comments???

No news, good news.
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Old 9th September 2013, 06:29 PM   #6
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Quote:
Originally Posted by Osvaldo de Banfield View Post
..made with things at hand
It's always great to see things going with components you have on hand


Quote:
Originally Posted by Osvaldo de Banfield View Post
...in the job, and made while boss isn't present‼ ;-)
Bad boy


Quote:
Originally Posted by Osvaldo de Banfield View Post
No opinions??? No comments???
Don't bother, once and a while writing postings here feels like talking with a wall.
My congrats.
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Old 9th September 2013, 06:43 PM   #7
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Quote:
Originally Posted by ChocoHolic View Post
It's always great to see things going with components you have on hand
Yes, repairing electronic industrial stuff, MOSFET's and IR's are at hand. And 4000 series CMOS too.

Quote:
Bad boy
Don't worry, boss never know it, nor that components had been paid by him :-D. And thanks for "boy", I'm actually 44. (Un)fortunatelly, he knows very few of electronic. The only legally Engineer here am I.

Quote:
Don't bother, once and a while writing postings here feels like talking with a wall.
My congrats.
Yes, but it happen too often. And it is very unpleasant.
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Last edited by Osvaldo de Banfield; 9th September 2013 at 06:47 PM.
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Old 9th September 2013, 06:57 PM   #8
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I want to add some comments on this amplifier, which is currently working pretty fine, but only I measured DC offset at output, and temperature rising in MOSFET "at finger thermometer", no more than 10C.

No one performance tests I did with instruments as I have no one more than a 20MHz oscilloscope, needed to see the "squeareness" of the signals at MOSFET and logic signals in the board. Simply at ear it sounds nice, and better than the previous STK amplifier in the same machine, the same signal source (The PC itself) and same speakers.
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Old 9th September 2013, 08:19 PM   #9
xrk971 is online now xrk971  United States
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You should take this design modify it to something that makes in range of at least 200 watts/ch - people here will eat it up if the parts are run of the mill and don't cost more than $20 in pieces. Nice job! Hope your boss doesn't get into DIY audio someday...
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Old 9th September 2013, 09:17 PM   #10
redjr is offline redjr  United States
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Cool! Seems like it would be subjected to 'digital noise' inside the computer - if not properly shielded. Any issue there? I like the application though.
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