Picking out parts for this schematic

[Seb1929]

I think i have done it right now. I did choose the 0603 (1608 metric). If you find anything that's wrong plz tell me.

 

[Mooly]

I'm assuming (for no good reason) that you are running this amp on 12 volts.

The voltage rating of the caps needs to equal the supply plus a bit more for safety. What supply will this be running on ? I see you have 10 and 6.3 volt caps on your list.

 

[Seb1929]

I'm assuming (for no good reason) that you are running this amp on 12 volts.

The voltage rating of the caps needs to equal the supply plus a bit more for safety. What supply will this be running on ? I see you have 10 and 6.3 volt caps on your list.

I hope to run with 3,3V. The amp can have 1,8 - 5,5V.

 

[Seb1929]

Does the components and everything look okay? Would it work if i bought everything and set them together?

 

[Mooly]

For those supplies the parts are fine... as long as you know how small they are.

I daren't even ask... how are you going to build this ?

 

[Seb1929]

For those supplies the parts are fine... as long as you know how small they are.

I daren't even ask... how are you going to build this ?

Yeah i know how small they are. I will use a microscope and buy many of each. I build until i manage to make one that works lol. I only need one for my first prototype. My hand is also where steady so i think i can do it.

 

[Mooly]

OK. Well good luck... and post some pictures of it when its done

 

[Seb1929]

OK. Well good luck... and post some pictures of it when its done

Thank you i will need it! I will sure post some pictures. Thank you so so so much for your help!

 

[Seb1929]

Does this look right?

 

[Mooly]

Looks basically OK.

Pin 4, the input should be as in your earlier post #1. The audio is AC coupled via the 22k. Not grounded via a 22k

Pin 1. Normal operation is with it grounded ? It probably is but worth just checking the data sheet to be sure.

 

[Seb1929]

Looks basically OK.

Pin 4, the input should be as in your earlier post #1. The audio is AC coupled via the 22k. Not grounded via a 22k

Pin 1. Normal operation is with it grounded ? It probably is but worth just checking the data sheet to be sure.

Oki thank you changed the Pin 4 and removed ground. Pin 1 is not something i'm going to use so i grounded it.
This is how Pin #1 looks in the data sheet.

 

[Mooly]

I haven't just time to look at the data sheet now. What its showing is that pin 1 responds to a voltage input. That will mean the chip will be in sleep mode when its either high or low... so you need to check and wire pin 1 to either the positive supply or ground as appropriate for it to work. Or... it may be normal to leave it floating. Look for examples in the data sheet and/or pin descriptions and what the voltage needs to be so that its not sleeping.

Edit... if your stuck I'll have a look tomorrow

 

[Seb1929]

I haven't just time to look at the data sheet now. What its showing is that pin 1 responds to a voltage input. That will mean the chip will be in sleep mode when its either high or low... so you need to check and wire pin 1 to either the positive supply or ground as appropriate for it to work. Or... it may be normal to leave it floating. Look for examples in the data sheet and/or pin descriptions and what the voltage needs to be so that its not sleeping.

Edit... if your stuck I'll have a look tomorrow

Okay i found this:

I think this is equation to calculate it.

 

[Mooly]

That's it. So it needs to be tied high to the positive supply to be active.

 

[Seb1929]

That's it. So it needs to be tied high to the positive supply to be active.

This looks right?

 

[Seb1929]

I can't find a 8uF Resistor that is surface mount. Can i use others? Like 8.06uF.

 

[Mooly]

That's how I understand it from the data sheet. The voltage needs to be at least 0.8 * supply and up to supply. So the easiest solution is to tie the pin high directly to the rail.

 

[Mooly]

I can't find a 8uF Resistor that is surface mount. Can i use others? Like 8.06uF.

An 8 uF resistor or an 8 ohm capacitor

Do you mean R4 that's marked '8' ? If so then that is the speaker itself (which is nominally 8ohm).

 

[Seb1929]

Yeah i mean that. Why got it the same symbol as a resistor?

 

[Mooly]

It just represents a nominal 8 ohm load although for testing purposes you could use a resistor. Its common practice to use a dummy load when developing a design.