A question about TDA2822M

[Haytham-Sief]

I'm working on a project including an audio circuit, The circuit consists of two stages: The 1st is a voltage amplifier using BJT tansistor, The 2nd is also voltage amplifier using op-amp. The output is only heard when it is connected on speakers with external electrical source( like computers speakers) but when it's connected directly to walkman speaker the sound is very very weak. Plzz I need a solution for such problem. Also if any one can tell me how to use the TDA2822M IC on the output of such circuit.

 

[IanP]

How to use TDA2822 you will find in its data sheet; link here:
https://www.st.com/stonline/books/pdf/docs/1462.pdf

As opamps have limited output current to mAs you will not be able to drive a speaker directly from them. If you connect your voltage amplifier to a computer speacer, it is different case because the input impedance of such a speaker (with built-in amplifier) is >10kΩ and it will accept levels from of typical audio standard ..