Author Topic: trouble with ir pen  (Read 6909 times)

Offline Pavellicus

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on: March 26, 2010, 05:00:34 AM
hi! i'm an italian student and i want to do one ir pen but i have some problems
 :'( :'( :'( :'(

i  have this items:


B3F 1000  Switch

i try to do this little circuit but it doesn't work!


help me!!!!!!!!!!!!!!!!!

i use AA Battery
« Last Edit: March 26, 2010, 05:03:58 AM by Pavellicus »

Offline boonjin

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Reply #1 on: March 26, 2010, 08:11:09 AM

How are you testing it?

The IR emitted is not visible to the naked eye. You can use your mobile phone's camera to test.

Also, please do check the polarity of the connections as the IR LED is a diode which only passes current on one direction.

Boon Jin

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Offline Pavellicus

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Reply #2 on: March 27, 2010, 06:09:48 AM
now i try wity telephone camera...but i see anything...

 :'( :'( :'( :'(

Offline shakespeare1212

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Reply #3 on: March 28, 2010, 12:31:24 AM
Your circuit should work if you have the correct polarity. Remember that the shorter lead out of the LED is the negative and the longer lead is the positive as it comes from the factory. If you have already cut these then you can look carefully into the bulb.  You will see something like this.

x x x x x x       x x x
x         x        x      x
x      x         x        x
x      x      x           x             <---------- This side is the negative sdie.
x        x      x x      x
x    xxxx          x    x
x    x               x    x
x    x               x    x
x    x               x    x

Also put your battery to a volt meter and make sure that is still is putting out 1.35 volts. You can also make your circuit more powerful by using 2 AA batteries and an 18 ohms current limiting resister. I use this set up in my Mark 5 IR pens.

James Mclain
Owner and Creator of
Whalebone IR and Software

or view and buy our products on ebay:   Search for IR pen or products by shakespeare1212.