hi i just made my first project with the tda 2003.But i dont know were i must put the pot so i can control tha volume.I used this schematic.

 

C1 to pot terminal 1, pot terminal 2 (wiper) to pin 1, pot terminal 3 to ground will work. What's the TDA amplifying??

 

thank you
this moment my mobile phone but i might try it with a guitar.
It should work right?

 

Guitars need to see a high input impedance...1MΩ or more. If your pot is less resistance than that, it might work, but it won't sound good. The TDA may also not provide enough gain to make the guitar loud...you can solve both problems by adding a simple op-amp stage before C1.

 

have you something simple to suggest?

 

C1 to pot terminal 1, pot terminal 2 (wiper) to pin 1, pot terminal 3 to ground will work. What's the TDA amplifying??

This was wrong.
Pot volume control : if the left number is pin 1 then the middle is pin 2, and the right is pin 3, the pin 1 connecting to GND, so when you turn to the left side, the sound will be weak, the pin 2 connecting C1, the pin 3 is the input, so when you turn to the right side then the sound will be loud.

 

How to Wire a Potentiometer.

 

so

1->in
2->c1
3->ground

right?

 

so

1->in
2->c1
3->ground

right?

If the pins according to what I linked and you doing that then when you turn to the left side, the sound will be loud, turn to the right side the sound will be weak.

 

no prob,i like it this way

can i use this as an op-amp?

 

no prob,i like it this way

can i use this as an op-amp?

Why you want to use LM386 as an op-amp?

 

then what to use?

 

The LM386 is a power amp. It doesn't have a high input impedance (at least, compared to op-amps) because it has built-in 50KΩ resistors. Try a TL071 or TL072...they're the common choice for guitar circuitry and usually work well.

 

a lot of discussion of wherfe to put the pot, but not any on the pot. it should be a log taper pot, linear taper pots change resistance differently, half total resistance in the center, log taper pots have their resistance tapered to more suit the sensativity of the human ear.