Instructables

DIY Emergency resistor - an electronic circuit component

Picture of DIY Emergency resistor - an electronic circuit component
1.jpg
2.jpg
3.jpg
4.jpg
Your in a cabin in the woods, your circuit is due tomorrow and the parts store is closed. You need is a few resistors now!
 
Remove these adsRemove these ads by Signing Up

Step 1: Gather the materials

Picture of Gather the materials
To make resistors you need a volt-ohm meter, some paper clips, slips of paper and a graphite pencil. I prefer a No. 2 pencil as a No. 1 is harder to find in an emergency.

Step 2: Scribble resistance

Picture of Scribble resistance
Applying steady pressure scribble a smudge with no line breaks on a piece of paper. The graphite in a No. 2 pencil has electrical properties. More familiar circuit resistors are made from carefully calibrated graphite wrapped in non conductive shell with connecting  leads protruding. Read http://en.wikipedia.org/wiki/Resistor

Step 3: Add the paper clips

Picture of Add the paper clips
Push two paper clips onto the paper so the metal of each clip is touching the graphite smudge.

Step 4: Measure the resistor

Picture of Measure the resistor
Attach the leads of the volt-ohm meter to the paper clips and measure the resistor value. Move the paper clips closer together to decrease the resistor value.

Beware (mild): Don't let your fingers touch the leads when you are measuring the resistance.  Your human contact to the leads with body resistance will distort the meter reading.

Beware (medium): Don't let the paper clips touch. If the paper clips touch there is an electrical 'short' as there is no resistance and your circuit might get damaged.

BEWARE (HIGH): This is LOW VOLTAGE SOLUTION - - do NOT use this in high voltage circuits.

The results of this DIY resistor vary enormously - - you did it yourself!

Enjoy.
billbillt10 months ago
great idea
"If only we had a resistor we could complete the defense robot and stop the zombies!"

"No problem, I just need a pencil, a piece of paper and two paper clips."
Sassah1221 year ago
Very nice instructable.
Sassah1221 year ago
Very nice instructable.
MikB1 year ago
Add a third paperclip in the middle and make a potentiometer :)
ilpug1 year ago
McGuyver would be proud!
rimar20001 year ago
Clever!
artworker1 year ago
Damn! This works? Nice thought!
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!