continuity tester


CHKNFKR

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Made this ages ago when i was into computers. it was specially made not to interfere with electrically sensitive equipment.

close up of the top side

close up of the bottom side

and clamped together notice it actually works

sensitive enough to light up by touching both probes

and a schematic if anyone is interested in making one. I'm decent at wiring and reading schematics, terrible at drawing them so i do apologize.


if you're interested it only took about half an hour and cost me less than $2.00, i had everything but the board just laying around.
 


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pillen140

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pretty cool. looks like something the unibomber made in his shed though, lol.
 

alwaysFlOoReD

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I think this belongs in the homemade tools thread sticky
:icon_thumby:

Richard
 

shane96ranger

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That brings back memories of my high school electronics classes. Back then there were only 3 colors of LED's (at least that's what our teacher told us) which were red, yellow, and green. We built several circuits like this on a breadboard that had 5 volts, 12 volts, and a function generator built in.

I have an old power supply somewhere I built that I used to use to repair car stereo's. It has a range of something like 2vdc to 16vdc. It only puts out 1-1.5 amps, so it's only enough to power it up for testing function and such.

It's cool to see stuff like that. Thanks for posting!
 

Viva*the*Ranger

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Clever, very clever. That's cool stuff right there.
 

CHKNFKR

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I think this belongs in the homemade tools thread sticky
:icon_thumby:

Richard
I remember stumbling upon this thread but have since lost track of it. could you direct me there?
 

feellnfroggy

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As long as it doesnt put out more than 5 volts +- tehn you wont have a problems with electronic scanning. The old analog meters used more power and burnt out alot of electronics.
 

CHKNFKR

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i don't have a volt meter handy but i can tell you this, the probe voltage is in the hundredths scale, if not less.
 

CHKNFKR

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Thank you Richard!
 

cody93

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ahaha, i was gona build something like this for my truck, a touch pad under the car handle linked to a relay going to the car horn, a dead man switch in the door jam would work better. those transistors amplify the current so it can light up the led, im guessing the transistors are there so you can lower the probe voltage to something very low to prevent damage to the electronics being tested.
 


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