Picture of Make a simple LED tester.
This is a very simple but useful LED tester that lets you test, compare and check the colour of just about any two pin LED.

To make it you will need the following:-

A PP3 battery connector.
A 470 ohm resistor.
A bit of heat-shrink sleeving to cover the resistor.
A two pin Molex style 0.1" (2.54mm) pitch miniature socket.
Two contacts for the socket.
A PP3 9V battery. Alkaline preferred.

And some LEDs to play with.

Step 1: The battery connector.

Picture of The battery connector.
The main part of this instructable is a cheap and common PP3 battery connector used to connect to the small rectangular 9V batteries.

Simple, direct and easy to build. A suggestion and a question.

Using a 9V Battery holder, and gluing the molex to the plastic battery holder would make a more compact tester, no? I believe that there are holders(sockets) made for LEDs that you could use as well (Smaller, easier to solder to) but (on dialup) I can't locate them on the web just know.

Do you know if there are LEDs 'out there' that might be damaged by the 9V power source? I assume you added the resistor to prevent this. I ask because I have salvaged LEDs from various boards and have no idea of the specs for them and was looking for a test device that would serve without possibility of burning up the subject LED.

OR, why use a socket/holder at all!

Multimeter Probes - Tweezers


Description: Testing surface-mount components with
standard test leads is anything but easy. Everyone has their own method:
some people tackle it with teamwork and have a friend (or grad student)
hold the probes, some people have adapted a sort of chopsticks-like
technique, but the best way by far is probably just to buy these handy
tweezer probes! Tweezer probes connect to your existing instrumentation
with shrouded banana connectors and allow you to easily test small parts
with one hand. The large plastic tweezers are easy to grip and are
marked for polarity.

Dimensions: Tweezers are 6" long with 10mm open clip distance. Wire lead is 16" from tweezers to jacks.


Jenn Nelson5 years ago
Really easy, and super useful.
Mudbud5 years ago
Nice job dude.****
Goodhart6 years ago
Simple and elegant. I like this. :-)