Two LED's and a pair of headphones. I just am uncertain how to connect the transistors. I really would just like any help showing how to connect the transistors as a darlington pair to see if it will be enough to drive the LED's and headphones. They are 2N2222 transisitors.The "example" you posted is just that, it is an example which is why part numbers for TR1 are not called out. The 555 has a limited output current so is not capable of driving any sort of a heavy load. You start with the data sheet for a LM555 timer or if you prefer a ICM7555 timer, whatever you have. You learn the capabilities of the chip and how it works. Then you look at the load you want to drive and what will be needed to drive the load. That is exactly what the image you posted tells you. So again I'll ask what is the load and what exactly are you trying to do? If you don't know what you want it is pretty difficult for anyone to help you.
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by Jake Hertz