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Step-up regulator 5V --> 12V using MC34063?

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mip

mip

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mc34063 application note

I'm currently trying to build a step-up regulator from 5V DC to 12V DC.
Datasheet and application notes of MC34063 are quite good, but I don't have a clue what NPN transistor to use to increase output current:

**broken link removed**
Q1 and R2 types/ratings are my problem...

Can you help me or provide me a link to existing schematics?
Thx alot in advance.
 

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