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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th June 2009, 04:54 PM   #121
riktw is offline riktw  Netherlands
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well mine amp is somewhere between hong kong and the netherlands atm, but its for a new PC amp.
only problem is that i want it small and the only transformer i have for it is 500VA, bit overkill
but what kind of transformer would i need for it?
2 times 100 watt means 200VA, and loss is 8%, so 16 watts max(8% of 100 = 8 watt, 2 channels means 16 watts.
so 225VA or 250VA looks ok to me, or do i need more or less?
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Old 6th June 2009, 11:17 PM   #122
vaughn is offline vaughn  United States
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I've got one on the way as well, so I will be able to participate in any modding experiments...

I went with sureelectronics 24v Meanwell power supply for mine. I am hoping they will do better than my Behringer A500 driving my Usher 2-ways. The Behringer is good but not as good as tube amps if have tried in the mids and treble.
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Old 7th June 2009, 12:41 PM   #123
kankara is offline kankara  Hungary
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Quote:
What about the output inductors though? Maybe thats why you have no bass?
the inductors are the original 220. that the number write on the inductors.
i have 4 inductors extrapolated from the Hlly ta2024, but i don't know if will be ok for the 2*100W sure electronics.
16 coils of enameled copper cable(O,6/0,8mm diameter) on a toroid ferrite 14 mm diameter.
the electric schematic of the 2*100W show the value of inductors: 10uH(L1 L2 L3 L4).
i'm not able to make myself the inductors. sorry.
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Old 7th June 2009, 03:11 PM   #124
youp is offline youp  Netherlands
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Default heat problem

I found a nice case and I solved the "heatproblem" with an aluminium block and a 12V fan. The heatsink doesn't get warm at all now.
On the picture you can see the progress so far.........
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Old 7th June 2009, 06:49 PM   #125
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If anyone thinks that amp has too much highs, then he should put zobel filter on the output 10ohm resistor and 470nF cap in series(cap is on positive side).

Regards Aleš
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Old 8th June 2009, 07:20 AM   #126
konman is offline konman  Australia
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Default Re: heat problem

Quote:
Originally posted by youp
I found a nice case and I solved the "heatproblem" with an aluminium block and a 12V fan. The heatsink doesn't get warm at all now.
On the picture you can see the progress so far.........

Thats looking good there,

what type of power supply are using?

How did you construct your case?
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Old 8th June 2009, 07:22 PM   #127
youp is offline youp  Netherlands
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I am currently using a philips 450W 32V smps. but the fan makes too much noise. I was lucky and had the case lying around. I made it very simple with a switch to select between 2 audio-channels and a potentiometer for the volume. I used a 7812 to make 12V out of the 32V for the fan.

Joep
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Old 8th June 2009, 09:12 PM   #128
blamus is offline blamus  United States
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hmmmmmmmmmmmm sounds perfect as a car amp with tiny footprint?

maybe 2 of the 2*100W to bi-amp a 2-way front stage running off the car battery?

What about the 4*100W version? or is that the noisy one?

Once I see an 'official' list of mods and a bit more feedback I'm gona get these to make a set of active home speakers, if that works out then the next step would be a battery powered portable boombox for carrying around, and then i can start thinking about ripping my car amps out.....................
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Old 10th June 2009, 05:07 PM   #129
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Can you bridge the two outputs to get 200W mono? Also you can chain multiple boards together to get even more watts?
Thanks,
CP
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Old 10th June 2009, 08:17 PM   #130
Nisbeth is offline Nisbeth  Denmark
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No, the 100W boards are already bridged.


/U.
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