For those who never heard about supercapacitor, you can check for more info about supercapacitor here
. Supercapacitor is basically a capacitor with very high capacity, and the capacity rating is normally around few Farads. With the “super” capacity, it basically can store a lot of charge, and I am going to use the “super” capacity to store charges for a 5mm LED. Let’s see how long will the 5mm LED last.
Step 1: Components Needed
The components you will need for this project is basically a supercapacitor (I am using 5.5V 0.1F supercapacitor which I bought from Farnell), a White LED, a 1K Ohm resistor and a USB male connector (I get this from an broken pendrive).
Step 2: Supercapacitor Polarity
Make sure you know the polarity of the supercapacitor, or refer to its datasheet
Step 3: Soldering
The first step is to cut the 2nd and 3rd pin of the USB male connector, we will need only the 1st and 4th pin (5V and 0V pin).
Then solder the negative pin of the supercapacitor to the 4th (0V) pin of the USB male connector.
Now, try to connect the positive pin of the supercapacitor to the 1st pin (5V). For the connection I am using a resistor leg.
Step 4: Soldering
Next, connect the positive pin of the White LED to the 1st pin (5V) of the USB male connector.
Finally, connect a 1K resistor from the negative pin of White LED to the 4th pin (0V) of the USB male connector.
Step 5: Schematic
Please check the diagram below for the complete schematic. You are actually free to use higher Farad supercapacitor, but voltage rating must be larger or equal to 5V, and you can have your creative way to connect all the components together.
Step 6: Testing
Now, plug it to your computer for around 10-30 seconds to charge up the supercapacitor.
You should see the White LED turned on (if it doesn’t turned on, there are some mistake in the connection), then after 10-30 second, you can unplug it and you should have around 10 minutes of the LED light.