Target Practice (previous article)

[VernGraner]

Hello, I was wondering if anyone could refresh my memory by telling me which issue of Nuts and Volts had an article on building sensors to detect hits and misses of a pellet gun or BB gun? I remember the article but I don't know what issue it was in. I have a project where I need to have a Basic Stamp detect pulses from a sheet of material when it is impacted by a solenoid. The simplest means I think would be to use a piezo glued to the board and then use some sort of filter to make this readable by the stamp, and rather than re-invent the whell, I was hoping someone could point me in the right direction... <p>Vern