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8
11. NPN transistor (Q2):
Build the mini-circuit
shown here. The LED
(D2) should only be on
if the press switch (S2)
is pressed. If otherwise,
then the NPN is
damaged.
12. PNP transistor
(Q1): Build the
mini-circuit shown
here. The LED (D1)
should only be on
if the press switch
(S2) is pressed.
Otherwise, the PNP
is damaged.
13. Adjustable resistor (RV): Build project #65, the resistor control
can turn the Lamp (L2) on and off.
14. 100WK resistor (R5) and 0.02mF (C1), 0.1mF (C2), and 10mF (C3)
capacitors: Build project #147, it makes sound unless the resistor
is bad. Place the 0.02mF capacitor on top of the whistle chip (WC)
and the sound changes (pitch is lower). Replace the 0.02mF with
the 0.1mF and the pitch is even lower. Replace the 0.1mF with the
10mF and the circuit will “click” about once a second.
15. 100mF (C4) and 470mF (C5) capacitors: Build project #120,
press the press switch (S2) and turn on the slide switch (S1). The
LED (D1) should be lit for about 15 seconds then go out (press
the press switch again to reset this). Replace the 470mF with the
100mF and the LED is only lit for about 4 seconds now.
16. Power Amplier IC (U4): Build project 124, adjusting RV should
change the sound.
17. Microphone (X1): Build project #23, blowing into the microphone
should turn off the lamp (L2).
18. Variable Capacitor (CV): Build project #113 and place it near an
AM radio, tune the radio and the capacitor to verify you hear the
music on your radio.
19. High Frequency IC (U5): Build project #52 and adjust the variable
capacitor (CV) and adjustable resistor (RV) until you hear a radio
station.
Advanced Troubleshooting (Adult supervision recommended)
150 Carpenter Avenue
Wheeling, IL 60090 U.S.A.
Phone: (847) 541-3800
Fax: (847) 520-0085
e-mail: [email protected]
Website: www.elenco.com
You may order additional / replacement parts at:
www.elenco.com/replacement-parts/
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