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-   -   A Bridged TDA2050 for Single Supply (http://www.diyaudio.com/forums/chip-amps/195315-bridged-tda2050-single-supply.html)

palstanturhin 25th August 2011 02:26 PM

A Bridged TDA2050 for Single Supply
 
Need to make one for car use. No virtual ground possible...
Running from single +24V...

Will it:
A) Explode?
B) Smoke?
C) Do nothing?
D) WORK?

Yes, the zobbels...

Thanks for your help!http://www.elisanet.fi/ch/2xTDA2050.png

sregor 26th August 2011 03:27 AM

Should work fine. Looks like Rod Elliots simple bridge circuit, with supply voltage divider for inputs. Simplest Ever Bridging Adapter for Amplifiers
I am presuming you used a separate supply circuit - seems it would have been just as simple to make a minus 12 supply as a +24. Just my 2 cents. Good luck.
BTW I like your connection of the cross resistor to the other side of the coupling cap.

palstanturhin 2nd November 2011 05:16 PM

Decided to go the "hard way" and build an SMPS for this.
SMPS works fine but does anyone see any problem with this?

http://www.elisanet.fi/ch/2xTDA2050_2.png

Its a subwoofer amplifier...

And it's oscillating - a lot!

AndrewT 2nd November 2011 05:59 PM

Can you attach an active filter to a chipamp?
I think you may have to do those separately.

palstanturhin 3rd November 2011 02:56 PM

Ok...

Andrew is once again right!
I made the filter passive, and ofcourse it works perfectly!

Thanks!

sreten 3rd November 2011 03:50 PM

Quote:

Originally Posted by AndrewT (Post 2767543)
Can you attach an active filter to a chipamp?
I think you may have to do those separately.

Hi,

Yes you can. But typically you take a unity gain active filter circuit,
and change the connection from the output to the unity gain point
of the feedback loop, i.e. connect the 3.3u to - in of the amplifier.

As shown the amp gain will make it oscillate like crazy.

To work accurately the lower feedback resistor has to be quite a bit
lower in value than the resistors in the active filter network I recall.

rgds, sreten.

AndrewT 3rd November 2011 04:24 PM

Thanks.
I'll try to draw that out and see what it looks like.

sreten 3rd November 2011 05:38 PM

Quote:

Originally Posted by AndrewT (Post 2768731)
Thanks.
I'll try to draw that out and see what it looks like.

Hi Andrew,

we have been here before I think :

http://www.diyaudio.com/forums/solid...-topology.html

rgds, sreten.

naxilla100 19th February 2012 06:01 PM

check this out
just change the power ic to 2040 or 2050
YOUR ic can be an active filter by its self.....

http://205.196.123.77/veyca8b6hcig/3...+2040+2050.jpg

sregor 20th February 2012 02:11 AM

Quote:

Originally Posted by naxilla100 (Post 2913584)
check this out
just change the power ic to 2040 or 2050
YOUR ic can be an active filter by its self.....

http://205.196.123.77/veyca8b6hcig/3...+2040+2050.jpg

The schematics are doing exactly what sreten suggested - using the signal from the inverting input for the Sallen and Key circuits.

Another possibility would be to use a voltage divider (two resistors) on the output - especially if you wanted to change the Q of the circuit by adjusting the signal fed back. (if signal fed back is greater than twice the signal in, with equal resistors and equal capacitors, you get an oscillator.) YMMV


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