User Manual

Project 41 Blink Rate Changer
Turn on the slide switch (S1);
the display on the LED-MC
(U29) shows “00”. Press the
A button on the selector (S8)
to increase the ones digit on
the display, and press the C
button on the selector to
increase the tens digit on the
display. When the display
shows “21”, press the B
button on the selector to
start.
The red LED (D1) will be
blinking, and its blink rate will
be changing.
Modify the project 41 circuit to be this one. It works the same way,
except there are two blinking LEDs.
Project 42
Click Rate
Changer
Use the preceding circuit, but
replace the red LED (D1) with the
speaker (SP2). The circuit works the
same way expect that it is clicks at
different rates instead of flashing.
-29-
Project 43 Double Changing
Blinker
The red & yellow LEDs (D1 &
D10) are alternating, and are
never on at the same time.