ARROWER – Our running blinking arrow like LEDs kit is based on
“10 bit counter.” Using the LM555 as a clock generator that consequently
increase the 10 bit counter by one therefore light the next
Arrow shape light together with the last LED. we use additional
NPN transistor to push the necessarily extra current require by
the additional 4 LEDs. This basic kit can work with many
conventional NPN transistors i.e. 2N3904, 2N4401, 2N2222, etc.
150 Ohms resistor determines the 4 arrow's LEDs brightness and limits the
current flow to about 10 to 15mA when running between 9V to 12
ARROWER flash running rate is determined by C1 capacitor and R1
resistor. Increasing C1 while decreasing R1 will slow the
The 9V battery and clip are for demonstration only
and is not included in this kit.