0.5-1.5W mono chip amp

[trzn]

Originally Posted by pacificblue

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.

Originally Posted by pacificblue

If low noise is your main concern

Yes, low noise and low quiescent current.

Originally Posted by pacificblue

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.

Originally Posted by pacificblue

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.

[nightanole]

Cimarron Technology, Inc.

Could help you with some of the smt ones and convert them to usable.

[trzn]

So, which chip should I choose?

[nightanole]

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.

[trzn]

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.

Originally Posted by nightanole

It sounds like a battery run time requirement, but a 12vdc battery that needs a really low idle current?

Correct.

Originally Posted by nightanole

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.

Originally Posted by nightanole

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.

[nightanole]

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.

[johnr66]

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

[trzn]

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.

[nightanole]

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.

[pacificblue]

Originally Posted by trzn

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