User Manual

Turn on the slide switch (S1). The green
LED (D2) and all LEDs on the disco
motor (DM) light.
Use the preceding circuit, but
replace the green LED (D2) with
the red LED (D1, “+” on left) or the
red/yellow LED (D10, in either
direction).
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 “2” in the display will be
toggling on/off at a varying
rate.
Use the preceding circuit, but add a
second blue jumper between points
A & B. Now both digits on the
display are toggling, but opposite to
each other.
-66-
Project 171
Red or
Yellow &
Lots More
Project 173
Vibrato 21
Project 170
Green & Lots More
Project 172
Vibrato 2
Compare this circuit to project 159. Here
the current through the green LED (D2)
controls the current through the LEDs on
the disco motor (DM) using the NPN
transistor (Q2), making all the LEDs on
the disco motor bright.