the conditions is already set so I can only use TDA7052A amp. And as for frq, I was told that the voice is from 300 hz to 3.3k hz and there isnt any need for music filter.
The components which I can use is UA741 (op amp), TDA7052A, LM78L08, transistor 2N3904, SPDT switch...l the rest are resistors are capacitors and LEDs.
Thats the components I have to use. It is actually my first mini project and I am quite lost as I just started learning this subject. I got to hand in my first draft by this friday.
I'm sorry about the bad image of my draft circuit. Attached is the new one...hopefully it is better by using paint.
The circuit for TDA7052A can be found here: (pg 8)
**broken link removed**
The block diagram has been included inside attachment so that there will be better understanding of what i am trying to do. Thanks for your help!