If you’ve ever looked into making your own blinking LED light, you have probably seen this tutorial. However, if you follow that schematic, you won’t be able to power many LED’s because the power source they will be using is the 555 timer. So, for this modified project, a transistor was used to allow a much higher number of LED’s to be used. This way, the LED’s are powered directly from the power source instead of the 555 timer.
The transistor’s middle pin is wired to the output of the 555 timer (pin 3). The LED’s get their positive voltage from the battery, and the negative side of the LED’s goes to the transistor. The third pin of the transistor goes to the negative on the battery.
Here are some photos of the process, including the end result. This won’t be a tutorial because the Instructables instructions are very easy to follow. However, feel free to ask any questions in the comments below. Also note that you can change the blinking speed by putting in a different capacitor.