Elenco Snap Circuits SOUND &reg - Manual (Page 39)

Use the circuit from project 43,
but replace the 100
W resistor
(R1) with the color LED (D8, “+”
to the left). Now when you press
S2 to play the recording, the
color LED will be flashing.
Project 43 Your Music Speed Changer
MP3 player
Project 44
Your Music
Speed Changer
(II)
Project 46 Sound On Light
Project 45
Your Music
Speed Changer
(III)
Build the circuit as shown. Set the 500k W adjustable resistor
(RV3) to mid-range, turn OFF the left slide switch (S1), and then
turn on the right slide switch. Connect a music device (not
included) to the audio jack (JA) as shown, and start music on it.
Now turn on the left slide switch, you hear a beep signaling that
recording has started. Wait until you hear a beep (signaling that
recording time is over), then turn off the left slide switch to exit
recording mode. Push the press switch (S2) to play back the
recording, and turn the knob on RV3 to change the playback
speed. You can play your recording faster or slower by changing
the setting on RV3. Try with different music, or with the touch-
tones on your cell phone.
To adjust the volume, adjust it on your music device before
recording, or see the next project.
Recording time is 6 seconds at normal speed, but this can be
changed depending on the setting of RV3 when you are making
the recording.
Use the preceding circuit, but
replace the 100
W resistor (R1)
with a 3-snap wire to make the
sound louder, or with the 5.1k
W
resistor (R3) to make the sound
quieter.
Build the circuit as shown
and turn on the slide switch
(S1). Set the lever on the
adjustable resistor (RV) so
the color LED (D8) just
shuts off. Talk loudly into the
microphone (X1), blow on it,
or clap near it to make the
LED flicker on.
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