Components
K1 = connector for supply voltage 7-2V
K2 = connector for programming
K3 = connector for Hall-effect switch
K4 = common + (positive) connection for LEDs
K5-12 = LED connections
D1 = 1N4007
C1 = 47 µF
C2, C3 = 100 nF
C4, C5 = 27 pF
X1 = 16 MHz quarz crystal
IC1 = AT Mega 8, programmed
IC2 = 7805 Spannungsregler
R1-R8 = 330 Ohm
R9-R6 = 56 Ohm (value dependent on LEDs used)
T1-T8 = BC548