Do you want to make something cool for a party? This is the circuit for you.
This is a simple way of blinking many lights at the same time. If you add the LEDs to a long wire, you can hang them in a window or use them to decorate a tree.
The circuit uses a 555 Timer, which is a classic integrated circuit that makes is really easy to make things turn on and off repeatedly. R1, R2, and C1 set the blinking speed while R3 sets the current that goes out to the LEDs.
Here’s the pinout of the 555 timer IC:
You can add or remove LEDs by changing the value of the resistor R3. For example, if each LED needs 10mA and you want to use 5 LEDs, you need 5 x 10mA = 50 mA through the resistor. You can use Ohm’s law to figure out the correct resistor value:
In our 5-LED example, that translates to:
Note: A standard 555 Timer can only give out up to 100 mA in total.
The Circuit Diagram
Find the components used in the table below. Click here to buy the complete kit.
|R1||10 kΩ||Standard Resistor|
|R2||100 kΩ||Standard Resistor|
|R3||100 Ω||Standard Resistor|
|C1||4.7 μF||Polarized Capacitor|
|L1 to L6||Red, yellow or green||Standard output light-emitting diode|
|U1||NE555||555 Timer IC|
Are You Stuck?
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