Elenco Circuit Maker Sound Plus 200 - Manual (Page 10)

Advanced Troubleshooting
(Adult supervision recommended)
-9-
ELENCO ® is not responsible for parts
damaged due to incorrect wiring.
If you suspect you have damaged parts, you
can follow this procedure to systematically
determine which ones need replacing:
Note: Some of these tests connect an LED directly
across the batteries without another component
to limit the current. Normally this might damage
the LED, however, Circuit Maker LEDs have
internal resistors added to protect them from
incorrect wiring, and will not be damaged.
1. Red LED (D1), 4.5V lamp (L4), speaker
(SP2), and battery holder (B3): Place
batteries in holder. Place the red LED
directly across the battery holder (LED + to
battery +); it should light. Place the 4.5V
lamp directly across the battery holder, it
should light. “Tap” the speaker across the
battery holder contacts, you should hear
static as it touches. If none work, then
replace your batteries and repeat. If still bad,
then the battery holder is damaged.
2. Jumper wires: Use this mini-circuit to test
each jumper wire, the lamp should light.
3. Snap wires: Use this mini-circuit to test
each of the snap wires, one at a time. The
lamp should light.
4. Slide switch (S1) and press switch (S2):
Build Project #1; if the lamp (L4) doesn’t light
then the slide switch is bad. Replace the
slide switch with the press switch to test it.
5. 100W (R1), 1KW (R2), and 5.1KW (R3)
resistors: Build Project #10; the red LED
should be bright. If not, then R1 is damaged.
Next use the 1KW and 5.1KW resistors in
place of the 100W resistor; the LED should
be dimmer but still light.
6. Microphone (X1) and photoresistor (RP):
Build Project #13; if blowing into the
microphone does not change the LED (D1)
brightness then the microphone is bad.
Replace the microphone with the
photoresistor. Waving your hand over the
photoresistor (changing the light that shines
on it) should change the brightness of the
LED or the photoresistor is bad.
7. NPN transistor (Q2): Build the mini-circuit
shown here. The LED (D1) should only be
on if the press switch (S2) is pressed. If
otherwise, then the NPN is damaged.
8. PNP transistor (Q1): Build the mini-circuit
shown here. The LED (D1) should only be
on if the press switch (S2) is pressed. If
otherwise, then the PNP is damaged.
9. Adjustable resistor (RV): Build Project
#14, the resistor control lever can turn the
LED (D1) on and off.
10. Recording IC (U6): Build Project #4.
Make an 8 second recording, then listen to
the three pre-recorded songs.
11. Space war IC (U3: Build Project #2, both
switches (S1 and S2) should change the
sound.
12. Whistle chip (WC): Build Project #165.
When you press the press switch (S2) you
should hear sound.
13. 100KW resistor (R5), 0.1mF (C2)
capacitor and 10mF capacitor (C3):
Build Project #120, it makes sound unless
the resistor is bad. Place the 0.1mF
capacitor on top of the whistle chip (WC)
and the sound changes (pitch is lower).
Replace the 0.1mF with the 10mF (“+” on
left) and the circuit will “click” about once
a second.
14. 100mF (C4) capacitors: Build Project #75,
press the press switch (S2) and turn on the
slide switch (S1). The LED (D1) should be
lit for about 5 seconds then go out (press
the press switch again to reset this).
Customer Service
Call toll-free: (800) 533-2441
e-mail: [email protected]
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