On Thu, 18 Apr 2013 09:24:47 -0500, Richard
wrote:

On 4/18/2013 9:09 PM, PrecisionmachinisT wrote:
wrote in message
...
On 4/18/2013 6:34 PM, PrecisionmachinisT wrote:
http://www.ramseyelectronics.com/sit...search&x=0&y=0


Probably more like:
http://www.simplecircuitboards.com/Timer%20Boards.html
An LM-555 and a couple of caps and resistors.

I know about the 555...it's covered extensively in the cmos cookbook..

Home made, untraceable (and no count down display like in the movies).

Not if it was triggered by cell phone...you don't want a telemarketer
setting it off, what you want an access code.




Still, I doubt it was a cell phone.
(besides the simple problem that the components in the pictures are not
phone parts)

A cell phone detonator would be great for a command detonated device.

But if that were the case, it seems like they would have had a much
higher body count.


One of the devices went off right in the middle of a crowd. You would
need to use bigger shrapnel and a higher order of explosive to get
more damage.

In one of the videos..the first blast went off..and hardly fazed any
of the runners..except for one guy..who evidently took a hit..and
dropped and rolled in pain.

The other device was in a stack of Stuff, next to a mail box..which
deflected the blast a great deal and it was out between the runners
and the crowd. Poor placement. To have done it right..it should have
been placed against the face of one of the stone buildings behind the
fans. It would have acted like a claymore.

Amatures..

Shrug

Gunner