Evo803 Posted August 16, 2009 Report Share Posted August 16, 2009 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 lm386Chris Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 16, 2009 Report Share Posted August 16, 2009 Why didn't you post the schematic or link to it? It is this project:http://www.electronics-lab.com/projects/audio/044/index.htmlThe 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. Quote Link to comment Share on other sites More sharing options...
Evo803 Posted August 17, 2009 Author Report Share Posted August 17, 2009 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? Quote Link to comment Share on other sites More sharing options...
audioguru Posted August 17, 2009 Report Share Posted August 17, 2009 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. Quote Link to comment Share on other sites More sharing options...
The Master Posted September 4, 2009 Report Share Posted September 4, 2009 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 Quote Link to comment Share on other sites More sharing options...
audioguru Posted September 4, 2009 Report Share Posted September 4, 2009 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. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted September 4, 2009 Report Share Posted September 4, 2009 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 Quote Link to comment Share on other sites More sharing options...
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