Step 2: The Video

We offer optional video segments of each step for this project in the actual exhibit. Here is a compilation of all the steps.


<p>Cool project. Kids will learn so much from this DIY project.</p>
<p>Would a piezo buzzer work in place of the speaker? Thank you in advance...</p>
I couldn't get this working with the copper tape either. Has anyone figured out how to make this circuit without solder?
Sorry you're having problems. Three possible issues and solutions: <br>1. We've discovered is that sometimes people get the transistors in the wrong place or backwards. Check to make sure they are put in correctly. <br>2. Sometimes leads are corroded or otherwise don't have good conductivity. Sand them gently to remove any corrosion and make sure to tape them on tight. <br>3. Some tape is conductive on both sides while others are conductive on one side (sadly, no packaging to tell us). So, where the tape must overlap to create a completed circuit, it doesn't work (I'm hoping that makes sense). My suggestion to solve this is to use wire to connect separate strips of tape instead of overlapping strips of tape. <br> <br>I hope one of these solutions works out!
<p>Actually the 3904 transistor on your build sheet is in backwards. The circuit is a type of relaxation oscillator, the collector of the 3904 should be connected to the base of the 3906. I tried it both ways and it is much louder if you flip the 3904 180 degrees, pin 3 to middle pin of 3906 and pin 1 to ground.</p>
I REALLY wanted this to work! Auugh, I'm sitting here with my attempt at this project and it is not working. Would love to do it with Middle School students, but if I can't do it, I can't expect a classroom to do it. <br> Would love to see how you do this project with museum participants.
Super instructable! <br> <br>One question though: can you give me more specifics about the photocell? <br> <br>I can only find really expensive ones online. <br>And I don't know much about electronics.. <br>So can you help me out?!
Great Instructable. Well done mate.

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Bio: More than 14 pulsating exhibits make the Children's Museum of Houston one of the top rated in the country. Packed with daily activities and ... More »
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