timer circuits

ANY Timer Switch
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Tony asked Connecting a 555 astable with a 4017 timer circuit, How do I boost my outputs?

I have connected the two above circuits together and have the right sequence of outputs that I want, but the output current is still too low. Is there a way I can boost the current through each LED? Would I use a transistor between to connect the 555 and the 4017? Or would that blow the 4017 IC? Or would I need a transistor after every output pin of the 4017? Am I even right to use a transistor?? WOULD BE A BIG HELP IF YOU CAN CLEARLY STATE WHERE TO CONNECT THE COMPONENT TO BOOST THE CURRENT AS I AM A REAL BEGINNER TO ELECTRONICS Thank you

And got the following answer:

You would need to boost EACH output of the 4017 using a transistor. Simplest drive method would be npn transistors, collectors wired to +v, each base to a 4017 output and each emitter to a current limiting resistor and LED in series to ground. Because that is an "emitter follower" configuration, the gain of the transistor will limit the drive current demanded from the 4017.


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