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Old 19th April 2010, 06:41 PM   #11
trzn is offline trzn  Lithuania
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Quote:
Originally Posted by pacificblue View Post
Is that a list of available ICs where you live or do you also want advice on others?
I want advice on others. DigiKey, Mouser, Farnell - places where I can order stuff.

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Originally Posted by pacificblue View Post
If low noise is your main concern
Yes, low noise and low quiescent current.

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Originally Posted by pacificblue View Post
Lower noise is available from newer designs. That usually means SMD as in nightanole's proposals, so maybe not the best choice for a beginner.
I agree. Those chips are very old, more than 10 years old.
I could try SMD as long as it is not something like TQFN or similar to it.

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Originally Posted by pacificblue View Post
Newer designs in that power range are also usually class D and work form low supply voltages of 3..6 V, e. g. the LM48xx series.
That's why I sadly cannot use class D amps, they operate on low voltages. And there is no point in using voltage regulators as they are not energy efficient.
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Old 19th April 2010, 08:03 PM   #12
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Cimarron Technology, Inc.

Could help you with some of the smt ones and convert them to usable.
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Old 20th April 2010, 01:40 PM   #13
trzn is offline trzn  Lithuania
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So, which chip should I choose?
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Old 20th April 2010, 03:27 PM   #14
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Well your kinda flaky on your requirements. Its hard to do 1-2watt, 12v, very low noise. Why dont you relist your requirements alittle better then just "low".

1. quiescent/idle current requirement for the chip and power supply
2. sn ratio minimum
3. distortion maximum at 1.5 watt
4. package requirements. aka thru-hole, smt pads, sockets
5. minimum speaker impedance
6. B+ voltage source. I believe you said 12vdc

What gets me is the 12vdc source, yet wants low idle current. It sounds like a battery run time requirement, but a 12vdc battery that needs a really low idle current? You would think the rest of the system would be sucking 10x more then even a "high" idle current setup. Hell if you think about it, a solution with a 5-8vdc rail via a voltage regulator, would have a low idle current, since the chip is running at a lower voltage, and the regulator is doing almost nothing while the chip idles.
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Old 20th April 2010, 03:58 PM   #15
trzn is offline trzn  Lithuania
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1. quiescent/idle current requirement for the chip and power supply -> the lower the better (<=30mA would be great)
2. sn ratio minimum -> reasonable (don't know much about it).
3. distortion maximum at 1.5 watt -> reasonable (don't know much about it).
4. package requirements. aka thru-hole, smt pads, sockets -> thru-hole would be the best option.
5. minimum speaker impedance -> 8ohms.
6. B+ voltage source. I believe you said 12vdc -> yes.

Quote:
Originally Posted by nightanole View Post
It sounds like a battery run time requirement, but a 12vdc battery that needs a really low idle current?
Correct.
Quote:
Originally Posted by nightanole View Post
You would think the rest of the system would be sucking 10x more then even a "high" idle current setup.
Each element powered from the battery consumes not more than 40mA.
Quote:
Originally Posted by nightanole View Post
Hell if you think about it, a solution with a 5-8vdc rail via a voltage regulator, would have a low idle current, since the chip is running at a lower voltage, and the regulator is doing almost nothing while the chip idles.
All I care is idle power consumption (so, if 5V amp + voltage regulator gives that, I am happy), no obvious hiss and reasonable distortion.
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Old 20th April 2010, 05:27 PM   #16
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Go with your TDA7052A or TDA7052. However use a 6vdc regulator to drop the 12v down to half. Idle current will not change from the stock 4ma with a regulator. It will just be 12vdc at 4ma instead of 6vdc at 4ma. I would also glue a hunk of aluminum to the top of it with jb weld or some other thermally conductive epoxy. I would want to push 1 watt through a unheatsinked dip8.


Hell now that i think about it you could just use a 6 volt zener to drop the voltage down to 6volts.

Last edited by nightanole; 20th April 2010 at 05:33 PM.
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Old 22nd April 2010, 06:03 PM   #17
johnr66 is offline johnr66  United States
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I still say to go with the TDA7276A.
No voltage regulation needed
Easy to heat sink
Minimum parts
Low noise
Will deliver 1.5 watts into 8 ohms with 12 volt supply (no clipping at this output)
Watch this video:
YouTube - vegmatic1966's Channel
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Old 22nd April 2010, 06:13 PM   #18
trzn is offline trzn  Lithuania
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At the moment I am trying to do it with 7052A.
That's what I got for now: http://img535.imageshack.us/img535/8213/7052av2.png.
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Old 22nd April 2010, 10:02 PM   #19
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The problem with the tda7267a (tda7276 is a motor speed control) is it idles at 35ma, vs 5ma of his 7052a. Hes going for an extended run time option. I think all it does is beep every once in awhile or something.
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Old 23rd April 2010, 05:13 PM   #20
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Quote:
Originally Posted by trzn View Post
That's what I got for now:
If you have more capacitance on the 7806's output than on the input, you should add a flyback diode.

Shouldn't there be an input resistor to ground?

The symbol you used for the input is the ground symbol
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