Reducing Gain of TDA8233

Dec 18, 2007 4 Replies
A

Hi,



I was wondering if anyone knows if its possible to reduce the gain of a TDA8233? The data sheet is a bit light on...

formatting link
I would like to run one at 9V and feed in 1Vrms to get 1W into 8R. I know I could reduce the input with an R-R network but it seems silly to attenuate it only to amplify it again. Perhaps someone could recommend a better IC? I have also been looking at the TBA820 but am also confused about how to adjust the gain of that as well.



Any help appreciated.



Best regards,


Adrian


Vote
Twitter Facebook LinkedIn
T

TDA7052A may do what you want. only the 'A' version has a gain adjust. The

7052 doesn't.
Vote
Twitter Facebook LinkedIn
W

Have you tried some resistance in series with pin 7.

Vote
Twitter Facebook LinkedIn
A

Thanks heaps, looks interesting, I can set the lower gain with the volume control which is nice. I don't understand how to calculate the power dissipation though? And in the text it says the volume control is 80dB range but on the graph in figure 3 it shows > 100dB. Am I missing something?

Regards,

Adrian

Vote
Twitter Facebook LinkedIn
A

Thanks for the reply Win. I Don't actually have a TDA7233 (not TDA8233) to play around with yet as im still trying to choose the best one. I am from Australia and I think Digikey is the only place I can get these parts from easily so I want to choose carefully.

I have noticed on the TBA820 (that I can get from Farnell) they use a resistor but I don't really understand what's going on there and it not very well documented. It would be nice to have an amp that I could run from

9-12V with a gain of 6dB so I could get around 1W in my speaker.

Regards

Adrian

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required