Instructables

DIY Emergency resistor - an electronic circuit component

Picture of DIY Emergency resistor - an electronic circuit component
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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!
 
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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

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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

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

Step 4: Measure the resistor

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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.
billbillt1 year 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!