Experiment #79: led flasher – Elenco 130-in-1 Electronics Playground User Manual
Page 98
-98-
Begin by sliding the switch to position B and wiring
the circuit. This LED flasher uses two diodes. As you
build this experiment, be sure to connect these
diodes in the correct direction.
When you finish assembling the experiment, turn on
the power by sliding the switch to position A, and
press the key. The LED starts blinking immediately.
Even if you don’t press the key, this LED flasher
starts flashing shortly after you turn on the power; if
you press the key, it begins blinking right away.
This LED flasher uses an operational amplifier as an
astable multivibrator, but its flashing time is much
shorter because of the two diodes.
Notes:
EXPERIMENT #79: LED FLASHER
Schematic
Wiring Sequence:
81-31-63-131-138
33-67-88-90-76
68-115-137-128-125
69-87-82-84
83-70-116-121
75-127
89-126
119-124
122-132
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