Hack night 6/21 ATTN: Scott

Ryan

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Jun 20, 2012, 10:37:43 PM6/20/12

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Scott, if you have a function generator can i borrow it from you for this thursday's meeting? If you're not going to be able to make it i can come pick it up from you. i need a sine wave between 60-120hz that i can feed into an amplifier for an experiment i want to do at the meeting.

Ryan

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Jun 20, 2012, 11:26:03 PM6/20/12

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To clarify, I plan on putting a non-newtonian fluid (cornstarch and water) on a speaker. I've seen videos of this experiment online and i figure its time for us to do it ourselves. I waterproofed a speaker i had laying around with spray on plasti-dip. It almost looks like a reverse cerwin vega speaker.

Scott Kovaleski

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Jun 20, 2012, 11:53:41 PM6/20/12

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Ryan

Good news, I do have a function generator.

Bad news, I am not going to be at the meeting because I am in Iraq until the weekend (I'll have lots of stories for the next hack night I can get to.)

You could try making a waveform with a 555 perhaps?

S

Dr. Scott Kovaleski

Associate Professor

Electrical and Computer Engineering

University of Missouri

349 Engineering Building West

Columbia, MO 65211

P: 573-882-8377

F: 573-882-0397

Matthew Little

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Jun 21, 2012, 12:01:20 AM6/21/12

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Hey Ryan, I'll be at the meeting tomorrow and can bring mine for you to borrow.

- Matthew

Ryan

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Jun 21, 2012, 3:34:11 PM6/21/12

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Thanks! I should have adapters here to amplify its output. Travel safely scott! Checking hackerspace boards in iraq... hope you're using tor

Ryan

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Jun 21, 2012, 11:39:11 PM6/21/12

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Everything went as planned with one exception. The speaker finally died around 9:15 pm. At first we weren't getting a pure sine wave into the speaker and it was getting hot too quickly. After we fixed that problem we did a few more experiments with it and had much more success with the ability to push the amplitude up further. We forgot to check the speaker temperature towards the end of the experiment and decided to go all out. The speaker is seized and will not budge. curiously what was previously an 8 ohm speaker (which read 6.5 ohms on a multimeter) is now showing 14 ohms.

I'll try to have a video posted in the next few days. Keep an eye out for it!

Scott Kovaleski

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Jun 22, 2012, 12:07:32 AM6/22/12

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Can't wait to see the video.

S

Dr. Scott Kovaleski

Associate Professor

Electrical and Computer Engineering

University of Missouri

349 Engineering Building West

Columbia, MO 65211

P: 573-882-8377

F: 573-882-0397

Message has been deleted

Ryan

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Jun 22, 2012, 5:55:30 PM6/22/12

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I was watching the last video i made from the take apart night backwards (don't ask) and i realized the word series sound almost identical backwards as it does forwards.

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