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Class D Switching Power Amplifiers and Power D/A conversion

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Old 14th February 2014, 11:54 AM   #1741
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Originally Posted by hajj View Post
Or you could use a blue LED and make Jean-Paul go nuts
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NEIN, not blue !

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Old 14th February 2014, 02:01 PM   #1742
Qbert25 is offline Qbert25  Italy
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Green is ok, but 8k2 resistor seems to be too high.

I=(19-2)/8200=2mA

I think "I" should be around 15-20 mA that means R=1000 ohm, isn't it?

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Old 14th February 2014, 02:05 PM   #1743
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2 mA is enough for a very soft glowing standard green 3 mm LED. Or it must be that you like to wear sunglasses while listening.

6k8 is OK for a normal glowing standard green 3 mm LED. Older generation LEDs needed 10 to 20 mA. Please try out what you like. IMO the equipment itself should not distract from listening but you might think otherwise and that's OK.
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Old 14th February 2014, 02:17 PM   #1744
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Using a power LED that requires 15-20mA seems extraordinarily excessive as it would double the idle power consumption of the amp.
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Old 14th February 2014, 02:24 PM   #1745
skrstic is offline skrstic  Serbia
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If it's green it's OK.
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Old 14th February 2014, 04:11 PM   #1746
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Using a power LED that requires 15-20mA seems extraordinarily excessive as it would double the idle power consumption of the amp.
In that light (ha ha ) given that these are extraordinarily efficient amps, what would be the most efficient way of making an 'on' light/led ?

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Old 14th February 2014, 05:03 PM   #1747
Qbert25 is offline Qbert25  Italy
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Ok, here are my tests:

- green led with a 5k resistor works well!

- 100F capacitor doesn't work.... bumps still there

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Old 14th February 2014, 05:27 PM   #1748
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In that light (ha ha ) given that these are extraordinarily efficient amps, what would be the most efficient way of making an 'on' light/led ?

Not to have one at all. Don't really see the point of it but you are welcome to explain why you'd want one.
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Old 14th February 2014, 05:51 PM   #1749
rsavas is offline rsavas  Canada
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LEDs
Hint: Use a constant current source set at a low value such as 2-5mA or what ever brightness you like. Use the SDZ control to disable the CCS so that idle I is only that of the 3116.
The CCS allows for constant LED brightness regardless of the supply V.

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... even we designing our boards we cant compete with that
Sure you can but you have the mfg over there where people work for a bag of rice and you have to buy the comps in bulk. It is a numbers game.
I worked for a lighting ballast mfg recently, where Philips was our biggest customer. We could sell ballasts to them cheaper than they could make their own,Advance brand. We are talking shipping containers of them. Why, cheap mfg and comps, where every penny counted. With this method came some real reliability headaches. I know I heard the complains from irate customers.
Back to the hockey game.

Cheers
Rick
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Old 14th February 2014, 08:23 PM   #1750
xrk971 is online now xrk971  United States
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Does anyone know if the Feixiang 2.1 board with 4 trimpots have an adjustable sub woofer XO frequency?

2.1 TPA3116 Hifi Class D Digital Amplifier Board 100W + 50W + 50W 50mA 12V 25V-in Consumer Electronics on Aliexpress.com

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