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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st July 2013, 07:59 AM   #361
PetruV is offline PetruV  Romania
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Shouldnt matter.i had 100mv on one and it barely bothered me
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Old 3rd August 2013, 12:04 PM   #362
stewin is offline stewin  Kenya
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Originally Posted by theAnonymous1 View Post
Here is a simple web tool if all you need to know is the turns required for a specified inductance....

Toroid Winding Calculator ? 66pacific.com
do you have a link for ee cores inductor calculator
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Old 4th August 2013, 05:58 PM   #363
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Well, I think I really screwed up my amp. I finally finished building the simple class D amp, from etching to populating with all the parts, winding my own inductor, (T106-2). All I had was a simple + and - power supply with two 6800uF caps, one on each rail, and a VH248 bridge rectifier, which is a 6 amp, 200 volt rectifier. My transformer was a 17-0-17 toroid transformer, so I figured aprox. +- 23vdc. So, I hooked it up, turned it on, and the bridge rectifier blew within seconds. I turned it off right away. It didn't look like anything happened to the amp, no smoke or heat or anything. I tested the power supply beforehand and it worked fine. I guess I need to build a really decent power supply and not mess around with quicky built supplies. So, what did I possible screw up on the amp? You can yell at me if you want.
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Old 5th August 2013, 05:57 AM   #364
stewin is offline stewin  Kenya
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Originally Posted by tom42107 View Post
Well, I think I really screwed up my amp. I finally finished building the simple class D amp, from etching to populating with all the parts, winding my own inductor, (T106-2). All I had was a simple + and - power supply with two 6800uF caps, one on each rail, and a VH248 bridge rectifier, which is a 6 amp, 200 volt rectifier. My transformer was a 17-0-17 toroid transformer, so I figured aprox. +- 23vdc. So, I hooked it up, turned it on, and the bridge rectifier blew within seconds. I turned it off right away. It didn't look like anything happened to the amp, no smoke or heat or anything. I tested the power supply beforehand and it worked fine. I guess I need to build a really decent power supply and not mess around with quicky built supplies. So, what did I possible screw up on the amp? You can yell at me if you want.
hi please use a 100wt bulb in series with ac to power supply when powering any first project
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Old 5th August 2013, 10:08 AM   #365
Hlaford is offline Hlaford  Croatia
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Slowing down filling of electrolytes is usually beneficial. Go with the bulb next time.
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Old 19th August 2013, 10:33 AM   #366
PetruV is offline PetruV  Romania
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Here's my compact layout based on original schem by ejtagle.
Is it tested ?????
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Old 19th August 2013, 12:18 PM   #367
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Is it tested ?????
ERC and DRC tested in EAGLE. As long as the schematic is correct, the board will surely work.

You have to do manual electrical testing if you etch your own board.
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Old 20th August 2013, 06:07 PM   #368
PetruV is offline PetruV  Romania
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Originally Posted by jlester87 View Post
ERC and DRC tested in EAGLE. As long as the schematic is correct, the board will surely work.

You have to do manual electrical testing if you etch your own board.
then im starting tommorow,can this run at +- 20v?
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Old 4th November 2013, 07:18 AM   #369
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I have Stewin's boards and this is the noise coming out of the speakers with the input grounded. What could be the problem?
Regards.
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Old 5th November 2013, 01:40 PM   #370
PetruV is offline PetruV  Romania
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I have Stewin's boards and this is the noise coming out of the speakers with the input grounded. What could be the problem?
Regards.
It could be a bad opamp,grounding connection,source,or most probably emi
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