Need Help Buiding the project using lm386

[Evo803]

The tiny amp schematic calls out a 22E resistor and I have no idea what this means. I have searched and have found nothing. Any help would be greatly appreciated.

The amp is under projects Tiny amp using lm386

Chris

 

[audioguru2]

Why didn't you post the schematic or link to it? It is this project:
http://www.electronics-lab.com/projects/audio/044/index.html

The datasheet for the LM386 shows how to connect it. It does not use a 22 ohm resistor and it does not use a 0.22uF capacitor. It is supposed to be 10 ohms with a 0.05uF (use 0.047uF) capacitor.

The text lies about its output power of 1W. Its power at clipping with a 6V supply is only 0.2W and its power at clipping with a 12V supply is only 0.53W and the IC gets very hot.

 

[Evo803]

That is the project I am trying to build. Is this project wired wrong then.
I am trying to find out what  r-3 / 22E is?

 

[audioguru2]

The value of the 22 ohm resistor R3 is wrong and the value of the 0.22uF capacitor C7 is also wrong.
Look at the correct circuit in the datasheet of the LM386.

 

[The Master1]

22E is the alternative reference of 22 ohms.
Lots of circuits refer to values such as 2E2 = 2.2 ohms, 680E = 680 ohms,
1E5 = 1.5 ohms,  330E = 330 ohms and so on .
I am sure this arises from the missing "omega" (ohm) font in most computers.

Hope that clears that up for you,

Cheers, Jeff

 

[audioguru2]

Why don't you make the circuit that is shown in the datasheet for the LM386? The manufacturer recommends it.

The kid who posted the project maybe never looked at the datasheet.

 

[Hero999]

22E is the alternative reference of 22 ohms.
Lots of circuits refer to values such as 2E2 = 2.2 ohms, 680E = 680 ohms,
1E5 = 1.5 ohms,  330E = 330 ohms and so on .
I am sure this arises from the missing "omega" (ohm) font in most computers.

I don't know where you heard that but it seems wrong to me, perhaps it's foreign? It certainly isn't English.

Normally the letter R is used if it isn't possible to use Ω, for example: 22R = 22Ω, 2R2 = 2.2Ω and 0R22 = 0.22Ω. For larger values the prefix can be used instead of the decimal place, 2k2 = 2.2kΩ = 2,200Ω.

I've seen the letter W used on some foreign articles but never the letter E.

In my view the letter E should never for Ohms be used because it can be too easily be confused with the exponent, for example 125E3 = 125