Manual

-102-
T
he digital LED can’t display all 26 letters of the
alphabet, but it’s possible to exhibit many of them.
L
et’s make an LED display that intersperse shows
the initials E and P of our ELECTRONIC
PLAYGROUND. You can show other initials too.
Slide the switch to position B and construct the
circuit. Once you have completed the wiring, slide
the switch to position A to turn on the power, and
you’ll observe the letters E and P lighting alternately
on the LED display.
IC 1 works as an astable multivibrator and exhibits
the letter E. IC 2 is used as an inverter, with an
output that is opposite to that of IC 1; it displays the
letter P.
Now that you’ve successfully displayed the letters E
and P, why not try showing other letters? It should
be easy if you take a close look at the schematic.
N
otes:
EXPERIMENT #83: INITIALS ON LED DISPLAY
Schematic
Wiring Sequence:
o 22-17-18-19-63-131-81
o 20-65-67-90-94
o 21-64
o 83-114-70-25-121
o 66-69-82-84-89
o 93-68-113
o 119-124
o 122-132
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