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Class D Switching Power Amplifiers and Power D/A conversion

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Old 28th April 2012, 12:48 PM   #2731
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Here are some more pictures of my amp6-basic:
Uppgraderad boombox (tips sökes) - Sidan 3 - Ljud - SweClockers.com
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Old 28th April 2012, 11:31 PM   #2732
kblnig is offline kblnig  Denmark
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Quote:
Originally Posted by bekutori View Post
Here are some more pictures of my amp6-basic:
Uppgraderad boombox (tips sökes) - Sidan 3 - Ljud - SweClockers.com
Did you do this connect the sleep/mute jumpers? - it does not seem like it from your pictures:

J2 on PCB rev. 1.1 + 1.2
it has 4 pins (sticking up from board), a line around each two pins (a pair)
----1st pair-------
the two pins closest to the TA2020 (the BIG chip) refer to Sleep, an input
when pins are connected (jumper on/placed), AMP is 'Awake', active/working (very low-power mode)
-----2nd pair------
the two pins closest to the J1 (output-connections, for the speakers) refer to Mute, an input
when pins are connected (jumper on/placed), AMP is UN-muted = active/working (unless still 'sleeping')
It is NOT recommended to place/remove jumpers when the amp is powered: use a switch (or two). Switching Mute and Sleep/Awake is not useful; just leave on Awake and switch Mute.
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Old 30th April 2012, 11:13 AM   #2733
blossom is offline blossom  New Zealand
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Default What Batteries???

Hi guys, I'm still way back at the start of this thread but getting though it slowly! I ended up here after deciding to build my self a portable "boombox" to sit on the tractor while i pick fruit into the bins on the trailers behind it...

Heres what i will do, I will either use some 6.5 inch 2 way/components or 6x9s(4ohm car audio gear). Sensitivity will be i supose between 90 and 93 according to manufacturer specs anyway!

Will use an lepai ta2020 amp.(will get moded ect)

I need it to give good performance(close to max output) over a ten hour minimum period and tehn ill take it home for the night and charge it for the next day agaiin.

Will use lifepo4 batteries(as this thing will need to be light enough light enough to sling over your shoulder and walk 15 minutes with it also).

So the big question is how many AH's of battery will i need to achieve this with these speakers and amp.

At first i was thinking along the lines of 10ah but ive read things that indicate perhaps that over kill for my goals??

Thanks in advance.
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Old 30th April 2012, 07:44 PM   #2734
Wubbaz is offline Wubbaz  Denmark
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Quick question:

If I put all my power cables from: cigarette stick, amplifier, solar panels and voltmeter into a single "kronmuffe" (terminal block?), how can I be sure the charge would be running from the solar panels into the battery and not into the amplifier?

Thanks
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Old 30th April 2012, 08:11 PM   #2735
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The batteries will automatically pull the voltage down. Voltage "flows" in all directions.
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Old 1st May 2012, 10:49 AM   #2736
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Would 3 7Ah batteries and 2 of these solar panels Koekraf Alternative Energy: Spezifikationen (12v 6W panel) be enough to run the boominator, in normal danish summer weather?
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Old 2nd May 2012, 08:01 AM   #2737
blossom is offline blossom  New Zealand
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OK let me rephrase my question

How many AH's of LiFePo4 battery will i need to power my Amp6 at full volume for no less than 10 hours?

Kind Regards
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Old 2nd May 2012, 08:04 AM   #2738
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Quote:
Originally Posted by blossom View Post
OK let me rephrase my question

How many AH's of LiFePo4 battery will i need to power my Amp6 at full volume for no less than 10 hours?

Kind Regards
About 3200mAh
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Old 5th May 2012, 11:13 PM   #2739
rubennn is offline rubennn  Denmark
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I was out measuring on my 14 W solar panel I bought from kerychip.dk last year but never got to use. I measured with a really shitty multimeter, but still numbers turned up on the screen. Sadly the multimeter can only measure up to 200 mA, so it's only useful for voltages.

Today was really sunny at around noon when I measured.

1. Measured in complete shade outside behind a building - Voltage was around 12 V.
2. Measured in full sunlight - Voltage was around 21 V.
3. Measure with panel being in only a little bit of sunlight (around 10 squarecentimetres) - 17 V
4. Took the panel inside in the basement and measure - 0.66 V.

All the time I was outside the multimeter couldn't show the current - need a better multimeter for that. It's over 200 mA anyways. Website says 0.87 A. :P

Saturnus, you said something about a diode should be included in a standard retail solar panel. Do you think that's what the 0.6 V on the fourth measurement is? I believe that standard diodes start working in the region 0.6-0.7 V.

If yes, then I should probably not worry about an external diode, right?
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Wohoo...Boominator 2012
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Old 6th May 2012, 03:38 PM   #2740
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Pretty easy to measure if there's a blocking diode present. Measure resistance in reverse, ie. from minus to plus. If it's infinite then there's a blocking diode present.
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