Elenco Circuit Maker Sound Plus 200 - Manual (Page 64)

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Project #162 Recording LED
Indicator
The circuit uses sound (beep) and light (LED) to indicate that you are
recording. Build the circuit and the red (D1) should light. Now turn on the
slide switch (S1). You hear one beep and the LED turns off. Speak into
the microphone (X1) to record a message. When you turn off the slide
switch, or the circuit beeps twice (indicating the recording is finished), the
red LED turns on again. Make sure that the slide switch is turned off. Press
the press switch (S2) to hear your recording followed by a song.
Remove the press switch (S2) and connect the red and black jumper
wires where it had been. Leave the loose ends of the jumpers
unconnected for now. There is one more part you need and you are
going to draw it. Take a pencil (No. 2 lead is best but other types will also
work). SHARPEN IT, and fill in the shape below. You will get better
results if you place a hard, flat surface directly beneath this page while
you are drawing. Press hard (but don’t rip the paper), and fill in the shape
several times to be sure you have a thick, even layer of pencil lead.
Press the loose ends of the jumpers to the shape and move them around
over the drawing to trigger your alarm. If you don’t hear any sound then
move the ends closer together and move over the drawing, add another
layer of pencil lead, or put a drop of water on the jumper ends to get
better contact.
Project #163
Pencil Alarm
Turn on the slide
switch (S1), the
whistle chip (WC)
sounds and D1 and L4
light. The whistle chip
(WC) and LED are in
parallel. To connect
the speaker in parallel
with the lamp press
S2. Now you have two
parallel circuits con-
nected in series.
Project #164
Two Lights Two Sounds
CM-200_Manual_031914.qxp_CM-200_Manual_031914 4/2/14 12:05 PM Page 64