A useful auto tester that everyone can do

A car tester that everyone can do

It will be very cool if you make this mini tester and always carry it with you in the car. After all, with the help of it you can: check the functionality of lamps and fuses without removing them from their seats, find out the polarity and presence of voltage in the conductor without even removing the insulation from it, check any circuit for a short circuit and much more. A very necessary thing that can be useful not only in the car, but anywhere.

Will need


  • Two LED different color.
  • Two resistors of 200 Ohm and 1 kOhm.
  • 3 V coin cell battery with connector.
  • A piece of wire.
  • Alligator clip.
  • Small plastic case.

Battery with block:
A useful auto tester that everyone can do

Plastic case from an old telephone headset:
A useful auto tester that everyone can do

Tester circuit


A useful auto tester that everyone can do

The scheme includes two LED back-to-back parallel with each other, with which the battery is connected in series. As a result, when two contacts are closed, green lights up Light-emitting diode, and when connecting power from outside, the red light is on Light-emitting diode. Below you will see how all this can be useful.

Manufacturing


So, we install the battery in the block. Next, glue it into the body using hot glue.
A useful auto tester that everyone can do

In the window from under the button we insert two LED and solder it according to the diagram.
A useful auto tester that everyone can do

A useful auto tester that everyone can do

Add resistors.
A useful auto tester that everyone can do

To make a probe, take a medical syringe needle with a wide hole so that the resistor leg fits into it.
A useful auto tester that everyone can do

We bite off the stem from any unnecessary resistor and insert it into the opposite direction of the needle. We fix everything with hot glue. The resistor contact should stick out.
A useful auto tester that everyone can do

Solder the probe to the tester.
A useful auto tester that everyone can do

We solder a small wire to the second contact of the battery and check the operation.
A useful auto tester that everyone can do

Fill all the voids with hot glue.
A useful auto tester that everyone can do

Close the back cover and you can use it. We fasten the clamp to the wiring.

How to use?


The tester is already ready for use; to “ring” something, insert an object between its probe and clamp. And if, say, the fuse is good, the green LED will light up.
A useful auto tester that everyone can do

To check the presence of power, connect the clamp to the common wire and use a probe to check the source. If there is a “+” there, the red light will turn on.
A useful auto tester that everyone can do

And if it’s a minus, then it’s green.
A useful auto tester that everyone can do

The needle pierces the wires perfectly and does not need to be stripped.
A useful auto tester that everyone can do

To take the tester with you, put a protective cap on the probe needle and take it with you for your health, it will not run out of charge and will always be ready for work.

Watch the video


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Comments (2)
  1. Gyadas
    #1 Gyadas Guests 30 January 2020 23:32
    2
    There is something missing from a normal tool. Namely, the ability to check a specific power or signal circuit. You need to add a 1.2w light bulb and a microbutton - then you will get a device that is perfect.
  2. Petrovich
    #2 Petrovich Guests 16 April 2020 15:44
    3
    On the diagram LEDs on the contrary, they should be in color!