100W+ amp needed desperatly!

[hernanstafe]

Ok i've tried to build a tda7294 based amp using 2 different pcb's and all i got is to burn 3 of these IC's. I need a 100W amp which uses a 60+60V PSU and FAST! Anyone have schematic/pcb for this?

PD: I can't use stk amps cause i can't get them here!

[neutron7]

The maximum voltage for tda7294 is +-50V maybe that why they burn up?

[hernanstafe]

oops! for some reason i was sure mas voltage for it was 70v!! i don't know why i thought that? now i feel really stupid. Ok still, is there any amp which can stand 70 + 70v or so?

[lukio]

Hi Hernanstafe,,

You probably should find high rail voltage amp in solid state main thread for that kind of amp you looking for. I never heard chip amp that can withstand rail voltage that high..



cheers,,

lukio.

[Elkaid]

Ok i've tried to build a tda7294 based amp using 2 different pcb's and all i got is to burn 3 of these IC's. I need a 100W amp which uses a 60+60V PSU

In fact, the TDA7294 is +/-50V when no signal is applied. It's +/-40V Max when signal is applied.

Last time I played with TDA7294, I had to unwind my 30+30V toroidal transformer because once rectified/filtered, the supply was too high and the chips were blowing up.

TDA7294 has a little brother with slightly higher specifications. The TDA7293 can go up to +/-50V with signal applied.
According to the datasheet, you'll get 100W for a 8ohm load with a 10%THD. I would go for 80 Watts instead in order to keep THD value at an acceptable level.


If you absolutely need 100W+, maybe you should consider for bridged/parallel LM3886 amplifier. National semiconductor has a whitepaper describing it.
AN192

However, even the amplifiers described in the application note cannot withstand +/-60V

[hernanstafe]

well the stk4241 does for example it can handle up to 80V actually, but it's stereo and i need a mono one, plus it's very very expensive

[Minion]

Why Not just drop the +/-60v Idea and Build PSU of more reasonable Voltages to run a Chip amp?? Or maybe you can Mod your PSU to put out lower Voltages....

If you don"t want to drop the +/-60v idea then you will most likely have to drop the Chip amp Idea and go for a Discrete Solid state amp useing BJT"s or Mosfets which should allow for a +/-60v PSU.....

It is sad But True.....

[hernanstafe]

well i'm trying to find a solid state amp, i seriously don't care about the amp type (chip, solid state, etc) i just want it to work properly. The PSU is made using a 110V transformer, with a "fake" ground rectifier to have about 70 +70v...i wonder if i can like downgrade the voltage to 50+50? i can think of resistors but they'll be HUGE! I don't have any other transformers to do a better psu around, so i have to fix the problem with that one

[stahlight]

Sir,

May I suggest a... monster

http://eportal.apexmicrotech.com/mai..._amps/pa04.asp

The Apex Microtechnology PA04. It's a hybrid chip, and it packs a punch. Audio up to 400W RMS. Also check out their other amplifiers.

I have used them before, excellent amplifiers. A word of warning: they are EXPENSIVE!

Hope this can help you!

[NUKE89]

Where can we buy those hybrid ics you say from internet?I cant find them here in greece.

And how much do they cost?