Resistors on schematics

[m3g4tr0n]

what (tolerance / wattage) resistors should i use on schematics that list only the resistor value.
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eg.
http://www.qsl.net/iz7ath/web/02_bre..._esr/index.htm

R1=10K <--- do i use any tolerance and watts?
R2=4K7
.....
R9,R11=1K 1%
R10,R12=22 1%

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when checking eBay to buy resistors i see. 1w, 1/2w, 1/4w - 1%, 2%, 5%, 10%

[PCBONEZ]

Re: Resistors on schematics

Figure out how many volts are across it then use ohms law to find current and watts.
Then use one rated higher.

5% is the normal/common tolerance.
If it's not marked you can assume it's 5%
1% is usually found in things like test equipment.
-
5% are pretty cheap and common.
Wouldn't buy 10% unless that's all I could find.
.

[romansroad]

Re: Resistors on schematics

Ohm's law is always best, but if you're working on a piece of gear and are replacing a resistor, you can estimate the wattage by comparing sizes on the board. If you're scratch building, then you're back with ohm's law.

[romansroad]

Re: Resistors on schematics

eg.
http://www.qsl.net/iz7ath/web/02_bre..._esr/index.htm

when checking eBay to buy resistors i see. 1w, 1/2w, 1/4w - 1%, 2%, 5%, 10%

Now that I see the circuit you're building (sorry, missed the URL), 1/4 or 1/2 watts would be fine, and 5% tolerance would be fine as well. You probably already have a PCB with these parts on it, so you won't need to buy them. I mean, if you're building an ESR meter, I bet you have some old boards in your junk box....right?