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Old 16th March 2008, 07:48 PM   #1
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Default 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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Old 16th March 2008, 08:34 PM   #2
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You mean ESP-P27?
Then the answer is yes. Use 1/4W resistors, except R16...R21 (5W).
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Old 17th March 2008, 12:57 AM   #3
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Yes and thanks. I suppose I can use 1/2 as well?
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Old 17th March 2008, 01:34 AM   #4
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Quote:
Originally posted by DeadSpeaker
Yes and thanks. I suppose I can use 1/2 as well?

Yep.
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Old 17th March 2008, 01:48 AM   #5
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awesome. I have this whole thing planed out so now i'm just freaking out about the little things.
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Old 17th March 2008, 02:38 PM   #6
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Sorry, for R9 position 1/4W rated resistor is not enough, there 1/2W rated is needed.
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Old 17th March 2008, 07:39 PM   #7
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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.
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Old 17th March 2008, 08:36 PM   #8
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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.
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Old 17th March 2008, 09:13 PM   #9
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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.
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Old 17th March 2008, 09:14 PM   #10
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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.
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