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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th February 2013, 10:33 PM   #51
xrk971 is offline xrk971  United States
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Quote:

You never said if a filter network and all that is necessary for the amp you're building. Or does it run directly from a DC source like most Class D amps?
Direct, no filters needed if supply is fairly clean like laptop brick.
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Old 25th February 2013, 11:34 PM   #52
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x,

No big filter caps or toroids? Aren't these class D's just tossing out all the rules? Crazy!

I screwed up and bought that other supply. I thought those were the good ones and the computer ones not so good. Who knew you could run an amp off something like a laptop power supply and have it sounding good?

It's hard to find one that's 24VDC and with any kind of amperage ratings. Many are around 17-18 VDC.

It's a crazy world from what things were when I started in this hobby 40 years ago!

I hope you keep me informed about the progress of your amp. Looks interesting.

Mark
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Old 26th February 2013, 12:30 AM   #53
xrk971 is offline xrk971  United States
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Class D amps are a paradigm shift. Everything is smaller and done without 'big iron' or heat wasted. They will work with good linear supplies but the whole point was to get away from linear regulators that make heat or require huge transformers because the freq is now high in Mhz. Small inductors small transformers, same power.

Check out ps from here if you want power without heat.
http://hifimediy.com/index.php?route...&product_id=73

Their amps are nice too.

http://hifimediy.com/index.php?route...&product_id=77

Last edited by xrk971; 26th February 2013 at 12:39 AM.
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Old 26th February 2013, 10:56 AM   #54
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X,

Ha! I was just looking at that HIFIMEDIY site last night. Ran across it by chance. [Or was it the power of suggestion by our Microsoft friends? :0 ]

$25! That's a couple of lunches. A give-away.

Mark
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Old 26th February 2013, 11:30 AM   #55
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Mark2727 View Post
X,

Ha! I was just looking at that HIFIMEDIY site last night. Ran across it by chance. [Or was it the power of suggestion by our Microsoft friends? :0 ]

$25! That's a couple of lunches. A give-away.

Mark
It will be tough to DIY that for less $ I have not bought from them myself but hear good things. Components look very nice.
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Old 12th March 2013, 04:54 PM   #56
xrk971 is offline xrk971  United States
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Mark2727,
Did you ever try to fix this with the cap and resistor approach - did it work?
X
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Old 12th March 2013, 07:59 PM   #57
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Default Not yet

Hey there X,

No, I have not yet attempted that fix. I wrote to Jerry of Jerry's Electronics, and pointed him to this discussion. He said he was working on a circuit almost identical to the one you proposed.

I am kind of waiting on him to take the lead and determine a final "fix" before I jump in. But if I don't hear back from him soon I'll just try it.

I did receive one of those sort of open cage, regulated, switch mode power supplies for this amp however. The kind you hook your own wires to. That totally solved the minor hum problem I was experiencing before (when using a salvaged wall wart type power supply). 24VDC, 2.1 amp. It's spanking good for $13 shipped. It's dead quiet and puts out no discernable heat.

So, no I haven't scraped the connection between pins 1 and 2 and tried your fix yet. But I do appreciate it and certainly will.

Mark
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Old 12th March 2013, 08:22 PM   #58
xrk971 is offline xrk971  United States
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Can you get me the link for the nice PS that you got? Is it a big transformer type or switch mode?
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Old 12th March 2013, 09:25 PM   #59
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Default cheapie power supply

Quote:
Originally Posted by xrk971 View Post
Can you get me the link for the nice PS that you got? Is it a big transformer type or switch mode?

Hello X,

Here's one from my seller just like I got. Switch mode.

Mark

24V DC 2 1A 50W Regulated Switching Power Supply | eBay
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