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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th June 2009, 03:54 PM   #141
blamus is offline blamus  United States
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I have another question, sorry I don't know much about power supplies etc. But if I want to use this amp (sure amp board 2*100) in the car, what do I need as the power supply? Can I just wire the amp to the battery which is already 14V? any links/pics on how this amp can be applied in a car would be great.
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Old 14th June 2009, 07:25 PM   #142
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I tried this amp with 12vDC and it worked fine.
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Old 15th June 2009, 12:28 AM   #143
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About 10W/4R on 12V.
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Old 15th June 2009, 04:47 PM   #144
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I think I have taken the board as far as I can?
Changed all the lytic's for Pany FC's, changed all the film caps, better quality, same values.
Removed C1 and C2 and replaced with a single 100nF Wima film cap.
Moved C6 to underside of board. Replaced C5 with a 100nF Wima film cap.
Added a 10uF Pany to the adjust leg of the 5V reg.
Removed D1 and D2 and re-routed the power supply.

PS this is just what I have done and is not necessarily a recommendation.
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Old 15th June 2009, 04:49 PM   #145
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And this is the underside...
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Old 15th June 2009, 07:35 PM   #146
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Does any of this mods affect the sound? Mostly your mods are on the 5V line that controls the preamp chip. I have changed the input resistors all the 22k to metal film and the sound is now more airy.

Regards Aleš
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Old 15th June 2009, 09:22 PM   #147
blamus is offline blamus  United States
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Quote:
40W/4R on 24V
Quote:
10W/4R on 12V
So whats the ideal supply voltage and current for this board to yield maximum power?
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Old 16th June 2009, 01:33 PM   #148
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Great job Audio1st. Can you please spend some words on the sound performance? Did you get a tangible improvement with your mods?
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Old 16th June 2009, 02:45 PM   #149
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I'll second that - great job Audio1st.
A couple followup questions:
1. In the 5V regulator, you put the 10uf cap in parallel with R2, correct?
2. It looks like you'd need to jumper D1 and D2 if removed - I take it your trace cutting and jumpering accomplish that and more?
3. Why move C6 to below the PCB - to get it closer to the chip?
4. You have a large blue PS reservoir cap on the side of your PCB - what value do you suggest?
Thanks again.
Best regards,
Mike
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Old 16th June 2009, 03:24 PM   #150
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My bad luck just continues. Just recieved this amplifier board and it played for 5minutes, with only the right channel working. After about five minutes the whole board muted and the mute/error led went on. I Guess I need to send it back since im not very good with electronics. Dont really trust cheap chinese amps :/. My lepai also broke after few days of use, and i dont really think im abusing them. Been using a 12V 9AH motorbike lead battery as a power supply since the amp is going for my portable ghettoblaster.
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