Resistor wattage question

DeadSpeaker · 16th March 2008, 07:48 PM

Hi,
Does anyone know if 1/4 watt resistors can be used in Project 27? The schematics show that some resistors should be 1 watt or 5 watts, but most have no wattage listed. Does not listing a wattage mean that it one should use some kind of a standard? Thanks for the help.

Andy L. Francis · 16th March 2008, 08:34 PM

You mean ESP-P27?
Then the answer is yes. Use 1/4W resistors, except R16...R21 (5W).

DeadSpeaker · 17th March 2008, 12:57 AM

Yes and thanks. I suppose I can use 1/2 as well?

xiphmont · 17th March 2008, 01:34 AM

Quote:

Originally posted by DeadSpeaker
Yes and thanks. I suppose I can use 1/2 as well?

Yep.

DeadSpeaker · 17th March 2008, 01:48 AM

awesome. I have this whole thing planed out so now i'm just freaking out about the little things.

Andy L. Francis · 17th March 2008, 02:38 PM

Sorry, for R9 position 1/4W rated resistor is not enough, there 1/2W rated is needed.

DeadSpeaker · 17th March 2008, 07:39 PM

Thanks. I was going to use 1/4 watt metal film, but I found that I have quite a few 1/2w carbon films that will work. So I will not be using any 1/4w ones.

cabbagerat · 17th March 2008, 08:36 PM

Quote:

Originally posted by DeadSpeaker
Thanks. I was going to use 1/4 watt metal film, but I found that I have quite a few 1/2w carbon films that will work. So I will not be using any 1/4w ones.

Most metal films are 1%, and most carbon films are 5%. Metal films also have less excess noise, and better temperature stability. I would stick to the metal films in positions where 1/4w is enough.

peranders · 17th March 2008, 09:13 PM

Quote:

Originally posted by Andy L. Francis
Sorry, for R9 position 1/4W rated resistor is not enough, there 1/2W rated is needed.

I hate to tell you that this is not correct. Only a couple of nA will flow through this resistor. 1/4 W will certainly do.

DeadSpeaker · 17th March 2008, 09:14 PM

Thanks for the tip. I just noticed that c14 is 10uf and it is non-polar. Is it possible to use electrolytic here, and if so how would it be oriented? Thanks.

16th March 2008, 07:48 PM	#1
DeadSpeaker diyAudio Member Join Date: Jul 2007	Resistor wattage question Hi, Does anyone know if 1/4 watt resistors can be used in Project 27? The schematics show that some resistors should be 1 watt or 5 watts, but most have no wattage listed. Does not listing a wattage mean that it one should use some kind of a standard? Thanks for the help.

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16th March 2008, 08:34 PM	#2
Andy L. Francis diyAudio Member Join Date: Feb 2008	You mean ESP-P27? Then the answer is yes. Use 1/4W resistors, except R16...R21 (5W).

17th March 2008, 12:57 AM	#3
DeadSpeaker diyAudio Member Join Date: Jul 2007	Yes and thanks. I suppose I can use 1/2 as well?

17th March 2008, 01:48 AM	#5
DeadSpeaker diyAudio Member Join Date: Jul 2007	awesome. I have this whole thing planed out so now i'm just freaking out about the little things.

17th March 2008, 02:38 PM	#6
Andy L. Francis diyAudio Member Join Date: Feb 2008	Sorry, for R9 position 1/4W rated resistor is not enough, there 1/2W rated is needed.

17th March 2008, 07:39 PM	#7
DeadSpeaker diyAudio Member Join Date: Jul 2007	Thanks. I was going to use 1/4 watt metal film, but I found that I have quite a few 1/2w carbon films that will work. So I will not be using any 1/4w ones.

17th March 2008, 09:14 PM	#10
DeadSpeaker diyAudio Member Join Date: Jul 2007	Thanks for the tip. I just noticed that c14 is 10uf and it is non-polar. Is it possible to use electrolytic here, and if so how would it be oriented? Thanks.