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Old 1st March 2010, 04:45 PM   #1
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Default Tda7265

hey guys,

I'm throwing together a TDA7265 amp out of parts I have laying around and i'm curious what this thing is going to sound like. The spec sheet shows it having pretty bad specs. Reminds me of a cheap TV output for surround speakers.

Does this thing have any hope of sounding good?
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Old 1st March 2010, 05:16 PM   #2
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Have a 2nd easy question.

Since im building this from parts I already have. I have a bunch of electrolytic caps. Can I throw in two 10uf 25V polarized electrolytics on the input as coupling caps? ive seen where people use caps when its with small signals like this.

When I say two. I mean one per channel, not two back to back.
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Old 1st March 2010, 05:41 PM   #3
mjf is offline mjf  Austria
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hello.
why should it sound bad? this is a chipamp as many others around.............will sound like the others.
a 10uf/25v elco on the input should be no problem (if you do not excess the input volts).
you will have to think about speaker load and psu voltage..........4 or 8 ohm speakers........+-16v or +-20v or so..............
and a good (=big) heatsink (chip mounted with isolation material on it).
greetings
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Old 1st March 2010, 05:53 PM   #4
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Quote:
Originally Posted by thetube0a3 View Post
Does this thing have any hope of sounding good?
As long as you don't push it. At moderate volumes it will sound okay.
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Old 1st March 2010, 06:53 PM   #5
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I'm planning on using two 19V SMPS desktop bricks. We have tons of them here and they are good for 3A a piece. Two together should give me a decent bipolar supply.
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Old 1st March 2010, 08:27 PM   #6
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19 V? Are they for laptops? Then cross your fingers that they are not noisy. And make sure that the output has no connection to PE, before connecting two as split supply.
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Old 1st March 2010, 08:30 PM   #7
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They are for laptops in a way. The output is pretty stable and quiet. They are also isolated.

If they end up being noisy we will find a way to quiet them down. Or just ditch the idea.
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Old 2nd March 2010, 06:33 AM   #8
sexya is offline sexya  India
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hii have m using this chip currnetly and to me they sound ok, not bad, and the only thing is that u need to make the cirucit asper the datasheet, u can keep the mute/standby pin floating , no issues,

i like the sound and mine is running at + - 22v with 8ohm dayton classic shielded 5.25" woofer
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Old 2nd March 2010, 09:41 AM   #9
pra3718 is offline pra3718  India
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Sexya,

Quote:
u can keep the mute/standby pin floating
Are you sure ? because tda7294 does not sound if I keep mute/standby pin floating/not connected.

Did you try for tda7265 bridge ?
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Old 2nd March 2010, 10:39 AM   #10
wahab is offline wahab  Algeria
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Quote:
Originally Posted by thetube0a3 View Post
I'm planning on using two 19V SMPS desktop bricks. We have tons of them here and they are good for 3A a piece. Two together should give me a decent bipolar supply.
Very dangeourous...

Both smps have the minus connected to earth.
So the negative side of your power supply will be
in short circuit to ground , unless you cut the negative supply
earth wire.
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