Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 134)

-133-
Project 302 Echo Light Headphone Project 303
Echo Light
Headphone Variants
Headphones
(not included)
WARNING: Headphones performance varies, so use caution. Start with
low volume, then carefully increase to a comfortable level. Permanent
hearing loss may result from long-term exposure to sound at high volumes.
!
Project 304 Press Echo Light
Project 305
Photo Echo Light
+
Use the preceding circuit, but
replace the press switch with the
photoresistor (RP). Adjust the
amount of light shining on the
photoresistor to change the sound
and light. You may need a big
difference in brightness to notice
the effects.
Next, replace the photoresistor with
the microphone (connect the “+”
side to the echo IC (U28)). Talk
loudly directly into the microphone
to flash the light and hear your
voice on the speaker (SP2), but
your voice will be badly distorted.
Build the circuit as shown, and
turn on the slide switch (S1).
Push the press switch (S2) to
see light on the color LED (D8),
and hear a clicking sound from
the speaker (SP2). Adjust the
amount of echo using the lever
on the adjustable resistor (RV).
Use the preceding circuit, but
replace the microphone (X1) with
the press switch (S2). Press S2 to
see light on the color LED (D8),
and hear a clicking sound from
your headphones.
Next, replace the press switch with the
photoresistor (RP), Adjust the amount
of light shining on the photoresistor to
change the sound and light.
You can use a stereo speaker (not
included) instead of headphones.
When using it with the microphone
(X1), you may need to lower the
volume to prevent feedback into
the microphone.
Build the circuit as shown, and connect your
own headphones (not included) to the audio
jack (JA). Turn on the slide switch (S1).
Talk into the microphone, and listen the
echo on your headphones, and see it on
the color LED (D8). Set the 500kW
adjustable resistor (RV3) for most
comfortable sound level (turn to the left for
higher volume, most of RV3’s range will be
very low volume); then adjust the amount
of echo using the lever on the adjustable
resistor (RV). Only the left side of your
headphones will have sound.
SCC-350_Manual_Part_C.qxp 7/25/14 2:10 PM Page 22