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Old 6th January 2014, 04:52 AM   #91
Gost22 is offline Gost22  Bolivia
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Default Stereo amplifier with TDA7296

Quote:
Originally Posted by esgigt View Post
Daniel, thanks for your answer.

I understand that the resistors in the NFB loop ought to be adjusted when the amp is operating under-volted.
The workings of the protection-circuit inside of the chip-amp where not clear to me, so you probably saved me from disaster. So I have to:
a: use more TDA's in parallel
b: restrict the current capabilities of the power-supply.

The latter seems most wise to me.

So a 2x15V 200VA trafo will probably fit the needs...
Hi esgigt!
For power suplly 2x15Vac or 2x22Vdc/200VA you fit audio amplifier with TDA7296.
See schematic (circuit)!
cheers!
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Last edited by Gost22; 6th January 2014 at 04:58 AM.
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Old 6th January 2014, 10:10 AM   #92
esgigt is offline esgigt  Netherlands
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Quote:
Originally Posted by Gost22 View Post
Hi esgigt!
For power suplly 2x15Vac or 2x22Vdc/200VA you fit audio amplifier with TDA7296.
See schematic (circuit)!
cheers!
Hi Ghost22,

I checked the tda7296 datasheet. But from my point of view the current capabilities of the 7296 will not do. Only 5 Amps where the 7293 does 10A!!
Please take into account that the minimum resistance of the load will be 3.2 Ohms (DC) and that current requirements at full output voltage but with current out of phase, can exceed the 5 Amps of the 7296.

So for load-stability the 7293 fits my requirements better than the 7296.

Anyway, thanks for your response!

Regards, Edwin
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Old 6th January 2014, 08:47 PM   #93
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Edwin, the 15+15vac transformer with the TDA7293 will get you about 10 watts to 8 ohm speaker or 19 watts to 4 ohm speaker. These wattage figures are also at maximum distortion. If you don't want maximum distortion, add some headroom by using a slightly higher voltage transformer, like 18+18vac. It is still possible to use just 19 watts, but with more headroom, it will have less distortion. See how that goes?

Ever turned the volume knob all the way on a car radio? That's the sound of no headroom, with enough watts but not enough quality. Anyway, the 15+15 is fine if the speakers only use 5W~10W@4R, so then there's headroom and you don't get that BLAAAAHHH!!! noise.
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Last edited by danielwritesbac; 6th January 2014 at 08:54 PM.
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Old 6th January 2014, 08:50 PM   #94
esgigt is offline esgigt  Netherlands
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Thanks, Daniel!

In that case I think a 2x20V/22V transformer would be better.
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Old 6th January 2014, 08:56 PM   #95
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A fair estimate indeed. However, remember the on-chip protection adding distortion at past 45W. An 18+18vac transformer can run the amp very close to 45W@4R. A 20+20vac transformer is also applicable.
However, a 22+22vac transformer with a chip amp and 4 ohm speakers is excessive and probably not a good practice.
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Old 7th January 2014, 03:55 AM   #96
Gost22 is offline Gost22  Bolivia
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Hi,
For the TDA7296 datasheet he writes:
Vs = 18V; RL = 4Ω:
Po = 5W; f = 1kHz 0.01%
Po = 0.1 to 20W; f = 20Hz to 20kHz <0.1%
Vs = 22V; RL = 4Ω; Po=60W for d=10%

cheers!
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Old 7th January 2014, 08:47 AM   #97
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Quote:
Originally Posted by Gost22 View Post
Hi,
For the TDA7296 datasheet he writes:
Vs = 18V; RL = 4Ω:
Po = 5W; f = 1kHz 0.01%
Po = 0.1 to 20W; f = 20Hz to 20kHz <0.1%
Vs = 22V; RL = 4Ω; Po=60W for d=10%
cheers!
For 22+22VDC rails we can use 15+15VAC transformer multiplied by 1.46 because of the bridge rectifier and caps in the power supply, resulting in 21.9+21.9VDC.

60W@10%THD is not useful because 10% distortion sounds terrible.
That thing is clipping.
BLAAAHHH!!! he says!!
To make it sound nicer, turn down the volume knob.
Therefore, a smaller figure like 15W@0.1%THD is more useful for music.
Reference: ESP SIM (Sound Impairment Monitor)
Cheers!
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