class H chip kit,unsuccessful

[mikee12345]

So a mate at tech built on of these-

and he said it distorts HEAPS, how can they sell a kit that doesnt give satisfactory performance!

link

"Based on the Philips TDA1562Q IC, this compact audio amplifier module can deliver up 70W into a 4-ohm load when powered from a 12V car battery. The perfect audio amplifier module for use in a portable PA, a tiny sub-woofer amplifier, a busking amplifier, or a car audio amplifier
"

Notice its 35watt rms, so its not much of an improvement over class a/b

Did the designers make a fundamental error/
i ask this because its not likely to be bad soldering, the tutor checked it over..

EDIT: data sheet here

[AGGEMAM]

It's impossible to tell whether there is something wrong with the scematics if you can't post a diagram. And also, what is the audio source you use?

[phase_accurate]

Notice its 35watt rms, so its not much of an improvement over class a/b

What do you expect you will get with class A/B out of 12 Volts ???????

Regards

Charles

[mikee12345]

bridged,the class a/b can output ~20w

im just saying,its not really worth it

I dont have the schematics right here,but i was wondering if ANYONE has completed one of these kits successfully!

what is the audio source you use?

He wouldve used one of techs sinewave generators.

[AGGEMAM]

Originally posted by mikee12345
He wouldve used one of techs sinewave generators.

Ah, that's probably the reason then. TDA1562Q is a integrated class G chip where the higher voltage is drained from a capacitor in peaks.

See it wont do sine waves very well, but it's probably another thing if you actually listen to it.

The TDA1562Q is designed for music not test signals. (I'm not saying whether the chip is good or bad, but whole design of the chip is based upon common music signals and not continious sine waves.)