Introduction: Tester for the Weekend Mechanic
Very simple tester that allows us to test continuity on a wire or printed circuits,also positive,negative,alternative and even binarie canbus signals. That is almost everything of the electric sistem of a car.
The tester lights green or red according to level of voltage ,if 0volt(ground) lights green ,if more than 5volt it lights red
We must avoid to test the high tension sistem because could burn the tester
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Step 1: Parts of the Tester
1 used A-27 battery
1 bicolor two legs led
1 ac connector
1 crocodile clamp
about 60 cms or more of wire
1 broken sewing machine needle
1 300 ohms resistor
Step 2: Disarming the Battery
With a small screwdriver disassemble the battery and you get 8 button cells and 2 litle hats
Step 3: Preparing the Components
Twist the led's leg in order to obtain a plain contact,sold the little hat to the wire and cut a plastic little circle
Step 4: Part's Deployment
This is the way we have to place the components inside the a-c connector,four cells with negative pole contacting the flat side's leg of the led,then a plastic separetor and the oher leg contacting the little hat
Step 5: Ensambling the Tester
Drill a hole on the lower side of the connector and then place the wire in it.
Put the led in the side hole with the flat side opposite to the wire.
Rise a little bite the led's leg in order to let us to put the separetor in betwen the legs
Straighten the led and introduce the cells in the a-c connector
Step 6: Tester Tip
Solder the needle in the inner side of the connector and cut the outer side's little sheet ,then screw it in the the other part of the connector
Step 7: Time to Test
working good,when the point touches the negative pole the led lights green,when touches the the positive pole then ligths green
Step 8: Fixing the Crocodile Clamp
Solder the resistor to the crocodile and then to the wire,cover them with the tube and shrink it
Take some soft wire make a ring around the crocodile end and solder it, in a way to let the pin slide in betwen
Pinch the crocodile coverage with the pin and slide it all the way through
Then we have the other point to test circuitry
Step 9: Testing a Printed Circuit
Sorry for my basic english,hope you understood the steps,ask any question I would be happy to answer.BR
Participated in the
Hand Tools Only Contest 2016
Participated in the
Full Spectrum Laser Contest 2016