-15-
Advanced Troubleshooting
(Adult supervision recommended)
11. Strobe IC (U23) and 100kΩ resistor
(R5): Build the mini-circuit shown here,
and turn on the s
witch (S1). The speaker
should make a buzzing sound or U23 is
bad. Next use the 100kΩ resistor in place
of the 5.1kΩ resistor; the sound should be
a beeping sound now or R5 is bad.
12. Infrared module (U24): Build project 41,
the remote control should turn the red LED
(D1) on;
otherwise U24 is bad.
13. 0.1µF capacitor (C2) and 100µF
capacitor (C4): Build this circuit. There
should be a buzzing sound, or C2 is bad.
Ne
xt, replace C2 with C4; now you should
hear beeps every 5 seconds, or C4 is bad.
The setting on RV does not matter.
15. Color organ (U22): Do project 182. If
parts A or B do not work, U22 is damaged.
If part C does not work, then there may be
a problem with U22, with your stereo
cable, with your music device, or you may
not have your music device on the right
settings.
ELENCO
®
150 Carpenter Avenue
Wheeling, IL 60090 U.S.A.
Phone: (847) 541-3800
Fax: (847) 520-0085
e-mail: help@elenco.com
Website: www.elenco.com
You may order additional /
replacement parts at:
www.snapcircuits.net
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