Academic Antics
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ReneCardenas
Like this story, reminds me of my first electrical circuit, it was a ...
Sanjib.Acharya
That was one my first few circuits too. Much before I studied engineering, since ...
The wheelchair siren
David Bley
8/17/2011 1:17 PM EDT
Early in my career, I knew a woman who had a medical condition that confined her to an electric wheelchair and made her speech quiet and hard to understand. When she was in a crowd, it was hard for her to navigate through it because people did not see or hear her.
I built her a simple two transistor siren that could be attached to the chair and was operated by pushing a momentary push button. When people heard that siren (it was not loud) they moved out of her path. She was tickled with it.
I built her a simple two transistor siren that could be attached to the chair and was operated by pushing a momentary push button. When people heard that siren (it was not loud) they moved out of her path. She was tickled with it.
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agk
8/20/2011 3:33 AM EDT
That is good idea and design. Now it can be done with simple piezeo buzzer.
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Sanjib.Acharya
8/21/2011 4:05 AM EDT
That was one my first few circuits too. Much before I studied engineering, since my childhood I was passionate about building small electronic gadgets by referring to books/magazines which used to publish hobby circuits. Even though I did not fully understand how that circuit worked, I built that circuit with two transistors and a small speaker form an old radio. My friends and I had fun with that for some time.
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ReneCardenas
9/30/2011 12:49 AM EDT
Like this story, reminds me of my first electrical circuit, it was a high-voltage generator, using a battery and couple of transistors, it was an interesting challenge to hold on to thiose metal bars!
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