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Old 20th January 2006, 08:16 PM   #11
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LM4756.
DC controlled volume.
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Old 21st January 2006, 12:53 PM   #12
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LM4756.
DC controlled volume.

Cool chip but the voltage requirements pushes the project into relatively more expensive surplus power supplies.
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Old 21st January 2006, 03:13 PM   #13
lineup is offline lineup  Sweden
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How about TDA7266 in my post above?

For 2x7 Watt I would recommend a DC supply
minimum rated 12VDC and 1.5-2 Ampere.


If you buy a trafo for 2x7 Watt at like 12 VDC
I would say you should buy
one transformer 9-12 Volt AC, rated 30VA or more
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Old 21st January 2006, 03:48 PM   #14
paulb is offline paulb  Canada
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Quote:
Originally posted by lineup
If you manage to find it

TDA7266 from SGS-Thomson
7+7W DUAL BRIDGE AMPLIFIER

Digikey sells it. That's a good choice too.
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Old 21st January 2006, 05:46 PM   #15
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Quote:
How about TDA7266 in my post above?
I ordered a couple... Mouser has them also... six bucks & in stock

Thanks!
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Old 21st January 2006, 05:52 PM   #16
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The suggestion of ac supplies is OK but this project has to be completed in 2 x 2 hour sessions... lest it drag on in perpetuity. The addition of AC/DC PS would lengthen the project time and add a little somethin'-somethin' to the lethal voltage quotient. It's not exactly electronics that young men devote their thoughts to... at least I do recall that to be my personal experience.
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Old 21st January 2006, 06:38 PM   #17
lineup is offline lineup  Sweden
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I understand, chipco3434.

Whatever 12 Volt you use, and if use of 8 Ohm speakers,
supply should be able to give 1.5 Ampere of current.
If you have to use 4 ohm speakers I would say 2.0 Ampere.

If you read datasheet of TDA7266, it is internally limited at 2.0 A (probably per channel)
and short circuit protected..

Heatsink for mounting IC does not have to be big.
1 mm thick aluminium and size like 3" x 6" might do.
I am sure you will find something.
Chip is also thermally overload protected.
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Old 22nd January 2006, 11:58 PM   #18
digi01 is offline digi01  China
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tda1521
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Old 23rd January 2006, 02:02 AM   #19
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Thanks to everybody for the great suggestions!
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Old 23rd January 2006, 05:18 AM   #20
JesseG is offline JesseG  Canada
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Hey Chipco:
Since nobody has yet mentioned it, I suggest you take a look in just about any IC mfgr's list of Automotive audio devices.

National, Pillips, TI, you name it... they about all make single-chip audio pwr stages for car stereos. Some of them have some pretty sophisticated features, too.

They are generally cheap (due to large numbers made) and easily implemented. I have seen a few with only 6 or 7 external components.

Best part - they are all made to run reliably off nasty, unstable power sources.

Good luck

Jess
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