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-   -   Tda7265 (http://www.diyaudio.com/forums/chip-amps/162340-tda7265.html)

thetube0a3 1st March 2010 04:45 PM

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?

thetube0a3 1st March 2010 05:16 PM

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.

mjf 1st March 2010 05:41 PM

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

pacificblue 1st March 2010 05:53 PM

Quote:

Originally Posted by thetube0a3 (Post 2103196)
Does this thing have any hope of sounding good?

As long as you don't push it. At moderate volumes it will sound okay.

thetube0a3 1st March 2010 06:53 PM

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.

pacificblue 1st March 2010 08:27 PM

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.

thetube0a3 1st March 2010 08:30 PM

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. :)

sexya 2nd March 2010 06:33 AM

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

pra3718 2nd March 2010 09:41 AM

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 ?

wahab 2nd March 2010 10:39 AM

Quote:

Originally Posted by thetube0a3 (Post 2103339)
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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