Resistor curiosity

Alex_D_Steak · Joined: Feb 17, 2005 Posts: 40 Location: Switzerland

I know I may be dumb, but then I ask anyhow...
what if I change the 1% resistor with 5%?

Maths tell me that I'm adding tolerance to the resisting force, but the real
question is: has anyone tried and checked the results? did your PCB set
on fire? did you hear voices from the "other side"? Very Happy

if anyone knows.. tell me! Very Happy

A more tolerant Alex Smile

mosc · Posted: Thu Mar 31, 2005 10:29 am Post subject:

In general, the precentage used on resistors tells you the manufacturers testing tollerence. For example a 1% 10000 ohm resistor would be expected to have values of between 9900 and 10100 ohms. A 5% resistor would be between 9500 and 10500 ohms. Your circuits will not catch fire. For accurate tracking, symetrical waveforms, and precise filters, designers prescribe resistors of tight tolerances.

jksuperstar · Posted: Thu Mar 31, 2005 12:42 pm Post subject:

If you have a multi-meter, you can check the resistance of the component in question (ie- your 5% resistor) and see how close it is. Many parts today that are "5%" are really pretty darn close.

Alex_D_Steak · Joined: Feb 17, 2005 Posts: 40 Location: Switzerland

I omitted to say that I've tested many of my resistors (various values) and
most of them are at max 0.5%...
Ok, since I have already the 5% values in place of the 1%, I'll start
using them. I'll get a random-acting cartonbox then Very Happy

mosc · Posted: Thu Mar 31, 2005 6:44 pm Post subject:

Well, if you measure it to be within %1 then it is 1% even if it is rated at 5% or 10%.