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Old 15th October 2012, 11:01 AM   #1
diyAudio Member
Join Date: Nov 2009
Location: Lincolnshire UK
Default Resistors

Been going through my component mountain and have come accross some large resistors that send my multimeter mental.

I have one 4 bands green, blue, yellow, gold.... my pc resistor colour guide says 560k.... my multimeter just jumps about like its on drugs. All my smaller resistors have worked fine.

Now some of these resistors could be upto 45 years old as they all came from my father in laws shop before he died. Do they have a shelf life and will a dodgy resistor do this to multimeter.
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Old 15th October 2012, 11:05 AM   #2
DF96 is online now DF96  England
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Join Date: May 2007
Some old components can develop intermittent contacts, or have tarnished leads. Either can confuse a meter. The former means bin it; the latter means just clean the leads.
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Old 15th October 2012, 11:13 AM   #3
diyAudio Member
Join Date: Nov 2009
Location: Lincolnshire UK
ok thanks... better get a cloth ready eh... got bloody thousands of the things. Also got some that are made from some sort of clay or pot. Are they any good for regular applications or are they for a particular job?
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Old 15th October 2012, 11:20 AM   #4
DF96 is online now DF96  England
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Some pictures might help.
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Old 15th October 2012, 11:43 AM   #5
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
if the leads are silver plated or tinned then a dab with a hot soldering iron completely removes the oxidation and replaces it with a thicker soldered (tinned) end that conducts properly.

gold is 5% tolerance. be prepared to do matching when you build.
regards Andrew T.
Sent from my desktop computer using a keyboard
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