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Class D Switching Power Amplifiers and Power D/A conversion

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Old 26th August 2012, 06:07 PM   #3171
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Originally Posted by chris661 View Post
Been thinking of getting one of those batteries for a while, but nobody's come back to me WRT whether they're actually any good.
For the price they're very good. If you remember the limitation that actual capacity is around 65% of nominal capacity with a C/20 load. Less with an even higher load.

The supplied (float) charger is utter crap though. And I can't stress enough the importance of getting a real charger that will not degrade the batteries with every charge.

Current limit is about C/2. Remember this. It will shutdown and you have to toggle the on-off switch if exceeded which is annoying if it's inside a cabinet.

Last edited by Saturnus; 26th August 2012 at 06:09 PM.
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Old 26th August 2012, 07:18 PM   #3172
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The supplied (float) charger is utter crap though. And I can't stress enough the importance of getting a real charger that will not degrade the batteries with every charge.

Current limit is about C/2. Remember this. It will shutdown and you have to toggle the on-off switch if exceeded which is annoying if it's inside a cabinet.
What charger would you recommend? And what does "Current limit is about C/2" mean?

Some more questions about the qubinator:
Why the closed cabinet? wouldn't it be better vented, considering it is so small?
Why TA2024 II instead of Amp6? Price? If so, will it be a big upgrade going for an amp6? (I can solder).
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Old 26th August 2012, 09:18 PM   #3173
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What charger would you recommend?

Some more questions about the qubinator:
Why the closed cabinet? wouldn't it be better vented, considering it is so small?
Why TA2024 II instead of Amp6? Price? If so, will it be a big upgrade going for an amp6? (I can solder).
Smart Chargers for Li-Ion / LiMnNi / LiNiCoMn Batteries

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Originally Posted by Kasper Jack View Post
And what does "Current limit is about C/2" mean?
Real Ah rating (C=capacity) divided by 2.

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Originally Posted by Kasper Jack View Post
Why the closed cabinet?
To make it as small as possible

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Why TA2024 II instead of Amp6?
The TA2024 is fine to drive 8 ohms loads
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Old 26th August 2012, 09:39 PM   #3174
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Smart Chargers for Li-Ion / LiMnNi / LiNiCoMn Batteries



Real Ah rating (C=capacity) divided by 2.
Ahh ok, thanks

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To make it as small as possible
I dont see how making a hole in the cabinet will make it bigger?

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The TA2024 is fine to drive 8 ohms loads
Ok, but the Amp6 is 25W vs. the 15W TA2024. Wont this give a bit more output?
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Old 26th August 2012, 11:41 PM   #3175
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I dont see how making a hole in the cabinet will make it bigger?
Then you have to re-read basic physical principles. Specifically you need to understand that a bass reflex is not "a hole in the cabinet". It's a carefully calculated Helmholtz resonator.

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Ok, but the Amp6 is 25W vs. the 15W TA2024. Wont this give a bit more output?
No. Again, you need to understand the basic physical principles. If impedance and supply voltage is the same then 2 amplifiers based on the same chip have the same output. The TA2020 and TA2024 is exactly the same chip internally. The only difference is the housing. The housing dictates it's thermal properties, and thereby how low impedances the chip can be loaded with (and to some degree how high voltages it can be supplied with). At 8 ohms load and 12V supply voltage both chips are well within their thermal limits and therefore will have exactly the same output power.

Last edited by Saturnus; 26th August 2012 at 11:46 PM.
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Old 27th August 2012, 08:37 AM   #3176
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Then you have to re-read basic physical principles. Specifically you need to understand that a bass reflex is not "a hole in the cabinet". It's a carefully calculated Helmholtz resonator.



No. Again, you need to understand the basic physical principles. If impedance and supply voltage is the same then 2 amplifiers based on the same chip have the same output. The TA2020 and TA2024 is exactly the same chip internally. The only difference is the housing. The housing dictates it's thermal properties, and thereby how low impedances the chip can be loaded with (and to some degree how high voltages it can be supplied with). At 8 ohms load and 12V supply voltage both chips are well within their thermal limits and therefore will have exactly the same output power.
Ok thanks for the help. Now i just need to find a way of getting my hands on some HP-10T's. Road trip to Sweden anyone?
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Old 27th August 2012, 08:54 AM   #3177
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Ok thanks for the help. Now i just need to find a way of getting my hands on some HP-10T's. Road trip to Sweden anyone?
Ljudia ships to Denmark. Just enquire by e-mail for the procedure.
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Old 27th August 2012, 09:22 AM   #3178
rubennn is offline rubennn  Denmark
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Ljudia ships to Denmark. Just enquire by e-mail for the procedure.
AND: Ljudia is a great company with great service. I've bought my HP-10W and grills there every time I needed them. Shipping costs are also decent. I would recommend buying from them.
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Old 27th August 2012, 10:51 AM   #3179
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Ljudia ships to Denmark. Just enquire by e-mail for the procedure.
Thats funny, i wrote an email to them a week ago, and still haven't received a reply.
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Old 27th August 2012, 11:13 AM   #3180
rubennn is offline rubennn  Denmark
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Thats funny, i wrote an email to them a week ago, and still haven't received a reply.
It ususally doesn't take that long. Try writing them another e-mail and wait for a couple of days.
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