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10. PICAXE 18X Double Seven Segment Display Circuit Diagram
Double seven segment display:
The circuit uses two 4026
decimal counters to index two
seven segment displays.
With the addition of a number of
switches as inputs we can
increment a score board.
By sending out pulses at the rate
of one per second we have a stop
watch.
Suggested Applications: 



Golf scoring
Football scoring
Tennis scoring
Timing
PAXE_C99 Component List
SW1 = 12 x 12 mm Tactile Switch
R1 (Resistor) = 10k ohm
R2 (Resistor) = 22k ohm
R3 (Resistor) = 4k7 ohm
R4 (Resistor) = 10k ohm
R5 (Resistor) = 10k ohm
R6 (Resistor) = 10k ohm
R7 (Resistor) = 10k ohm
R8 (Resistor) = 10k ohm
CN1 = 2.1mm DC Power Socket
CN2 = 3.5mm Stereo Jack Socket
C1 (Capacitor) = 100nF (0.1uF)
C2 (Capacitor) = 220uF
C3 (Capacitor) = 220uF
C4 (Capacitor) = 100nF (0.1uF)
TB1 - TB5 = (2 way Terminal Block)
D1 = (Diode) 1N4001
D2 = (Diode) 1N4148
IC1 = 7805 Voltage Regulator
IC2 = PICAXE18 / 18A / 18x
IC3 = 4026 Counter
IC4 = 4026 Counter
DS1 = 1" Common Cathode 7 Segment Display
DS2 = 1" Common Cathode 7 Segment Display
PAXE_C99 Artwork Print 170mm x 120mm
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