When using the transistor only use the
emitter and collector. cut the base off or just bend it out of your way.
I will do a little cut and paste from the site I got the circuit from for those that are interested in why and how it works.
In this implementation, a common NPN transistor is used. In the circuit, a 1k resistor charged the 330 uf capacitor until the voltage became large enough to get the emitter-base junction to conduct. In the oscilloscope image, it can be seen that the peak voltage (yellow trace) was a little bit less than 9 volts. At this point transistor turned on quickly and partially discharged the 330 uf capacitor through the LED and the 100 Ohm current limiting resistor. The current wavform, which is the voltage drop across the 100 Ohm resistor, is shown in the blue trace on the scope image. Peak current was 26 milliamps, and the transistor continued to discharge the capacitor until conduction suddenly ceased at 60 milliamps. After the transistor stopped conducting, the capacitor began charging again, thus starting a new cycle.
To see oscilloscope image go to Simplest LED Flasher Circuit
What I did is no rocket science I used a common positive and a common negative and added more transistors. I also mixed and matched different combinations of resistors and capacitors so each LED blinks different then the others. In my mind the best blink fade in fade out combo is a 10K with a 2200 UF capacitor. it only blinks about once every three seconds but it looks more like a real firefly.
The image on this step is copyrighted by Richard Cappels at http://cappels.org/
, and is republished here with permission on this web page.