About the article

LEDitron Scoreboard

With discrete 7 segment displays

Based on a Labs project | August 2017 | Find it here
LEDitron Scoreboard
Believe it or not, there was a time when hobbyists found 7-segment displays with red LEDs (cutting-edge technology at that time) hard to come by and virtually unaffordable. If you absolutely needed a 7-segment display, you had to make it yourself from cardboard, translucent red film and incandescent lamps.
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Relevant websites
Extra info / Update
  • Scoreboard and timer
  • Microcontroller driven
  • LEDitron displays
  • No SMD components
  • 12 VDC supply voltage
Component list
From the Store
150448-1 LEDitron display PCB (4 required)
150448-71 LEDitron kit including acrylic parts, without filaments (4 required)
160205-1 Scoreboard motherboard PCB
160205-41 Pre-programmed microcontroller

Component List
Display board
R1 = 220Ohm
LED1 = 5mm
K1 = 10-pin SIL pinheader, angled
PCB # 150448-1
Default: 5%, 0.25W
R2,R5,R8,R11,R14,R17,R20,R22,R24,R28,R32,R38,R39,R40,R41,R42 = 4.7kOhm
R23,R25,R29,R33 = 100kOhm
R1,R3,R4,R6,R7,R9,R10,R12,R13,R15,R16,R18,R19,R21,R27,R31,R35,R37 = 1kOhm
R26,R30,R34,R36 = 47kOhm
R43,R45 = 27kOhm
R46,R49 = 2.2kOhm
R47 = 10Ohm
R48 = 390kOhm
R44 = 3.3kOhm
P1 = 4.7kOhm trimpot, horizontal
C1,C2 = 470µF 63V
C3,C5 = 100nF
C4 = 10µF 63V
C6,C7 = 18pF
C8 = 330pF
C9 = 4.7µF 100V
L1 = 47µH
D1 = MUR160G
IC1 = LM78L05
IC2 = ATMega328P, programmed
IC3 = ICM7555

X1 = crystal 16MHz
K1 = 2-way PCB screw terminal block, 5mm pitch
K2 = 4-way SIL socket header
K3 = 5-way SIL socket header
K4–K7 = 10-way SIL socket header
K8 = 6-pin (2×3) pinheader
JP1 = 3-pin jumper
S1–S4 = pushbutton switch, NO
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