REGISTER | LOGIN
Breaking News
Blog

Engineering practical jokes: A shocking trick

NO RATINGS
View Comments: Newest First | Oldest First | Threaded View
15019 Rattlesnake Road
User Rank
Author
re: Engineering practical jokes: A shocking trick
15019 Rattlesnake Road   10/6/2011 7:52:27 AM
NO RATINGS
Good grief, all you have to do is interrupt current in the primary circuit when the door opens. The conducting path for the primary is between the door frame and the door hardware. The secondary (HV) side attaches to the doorknob on the inside. When you expect your roommate, you simply energize the primary with a hefty battery. The door frame is circuit 'common.'

David Ashton
User Rank
Author
re: Engineering practical jokes: A shocking trick
David Ashton   10/5/2011 11:38:24 PM
NO RATINGS
Did you watch the video Rene? still not much detail there though.

David Ashton
User Rank
Author
re: Engineering practical jokes: A shocking trick
David Ashton   10/5/2011 11:37:40 PM
NO RATINGS
You could do it with a 555 and a transistor. I once made a friend an electric fence driver with an old valve radio transformer and an ignition coil. On one half cycle the HV winding charged up a cap. On the next half cycle the 6.3v winding triggered an SCR which put the cap across the coil. You just had to get within half an inch and a spark would jump across onto you. My friend was called Frank, so we called my device Frank's Zapper...

ReneCardenas
User Rank
Author
re: Engineering practical jokes: A shocking trick
ReneCardenas   10/5/2011 4:04:40 PM
NO RATINGS
Did I miss link or additional text?, 2 sentences is all I cn read on this plot. No enough meat to go either way.

WKetel
User Rank
Author
re: Engineering practical jokes: A shocking trick
WKetel   10/5/2011 12:23:37 PM
NO RATINGS
There are a few details missing here, since, in the era that he plated this trick, automotive ignition coils did not include any interrupting means integral with the coil assembly. So we could assume that it was probably one of the very old Ford Sparking coil devices. If not, then it could be useful to know just how a more current coil was driven to work in this application.

More Blogs
If you are looking to make a switch from hardware engineering to software programming, Facebook and Udacity have created a shortcut for you.
Market researchers predict a high-end car will contain more than $6,000 worth of electronics in five years, driving a $160 billion automotive electronics market in 2022.
TechInsights continues to dig into the process, cell structure and materials analysis of the Intel Optane XPoint memory.
The history of computing is not complete without the acknowledgement of mathematicians, scientists, and engineers like the African American women of NASA.
Amazon’s $13 billion bid to buy Whole Foods is a big-data deal that begs the question: What’s the future of the digital grocery store?
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed