-35-
How about some rest? Here’s another circuit for
entertainment. This circuit flashes the numbers 1
and 2 on the display. You might be reminded of
some neon signs with flashing, eye-catching
advertisements on them.
A circuit called a flip-flop controls the LED display in
this project. You will learn more about flip-flop
circuits in later projects. For the moment, try a
different value for the capacitors to see their effects
on the speed of operation. See if you can rewire the
LED to display numbers other than 1 and 2. You can
try different, higher values in place of the 2k
Ω
and
4.7k
Ω
resistors. Do not use lower values for any of
the resistors or you might damage the transistors.
Notes:
EXPERIMENT #22: FLIP-FLOP MULTIVIBRATOR WITH LED DISPLAY
Wiring Sequence:
o
17-19-20-22-41-116-82
o
21-42-45-119
o
23-44-118-84
o
79-81-83-85-25-124
o
80-117-40
o
86-115-43
o
121-122
Schematic
Summary of Contents for EP-130
Page 11: ... 11 I ENTERTAINMENT CIRCUITS ...
Page 26: ... 26 II BASIC SEMICONDUCTOR AND COMPONENTS CIRCUITS ...
Page 36: ... 36 III LED DIGITAL DISPLAY CIRCUITS ...
Page 41: ... 41 IV A TOUR THROUGH DIGITAL CIRCUITS ...
Page 49: ... 49 V MORE ADVENTURES WITH DIGITAL CIRCUITS ...
Page 64: ... 64 VI THE WORLD OF TRANSISTOR TRANSISTOR LOGIC ...
Page 77: ... 77 VII APPLICATION CIRCUITS BASED ON THE OSCILLATOR ...
Page 88: ... 88 VIII BASIC OPERATIONAL AMPLIFIER CIRCUITS ...
Page 116: ... 116 IX MORE ADVENTURES WITH OPERATIONAL AMPLIFIERS ...
Page 129: ... 129 X COMMUNICATION CIRCUITS ...