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thanks alot for your reply! i will try it with the lipo battery charger.

i want to use 5V power supply

hi!

here is a description how to setup teensy2 to work with external power:
http://www.pjrc.com/teensy/external_power.html

i am interested in option #3..
but where do i have to put the diodes...

hi!

i want to use the teensy board to control 12 led's.
for the led's i need 5V so i have to use 4 AA batteries (1.2V) to power them.

the teensy itself should be powered by the 4 batteries...