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view of imperial probe droid model displayed in the exhibit "Star Wars: Where Science Meets Imagination" at the U. S. Space and Rocket Center in Huntsville, Alabama
Here is a photo of the finished shirt for my nephew Mason. I painted a shadow and snowbank freehand with watered down paint. I then waited 24 hours before washing it.
The British assault force with elements of the 1st Royal Scots (Light Coy) along with the 41st Regiment.
Sony a6000 + SMC Pentax-A 1:4 200mm
universal logic probe using the popular LM393 and NE555 ICs. All the details including schematic, PCB design files and CAD files are available at jayakody2000lk.blogspot.com/2021/08/universal-logic-probe...
Testing a NaI(Tl) probe I got lying around for some time. Using documentation from the company that build these probes, Scionix, I was able to make a voltage divider and solder it to the tube socket. Later I will put it in a proper housing with BNC sockets and a mu metal shield against the Earths magnetic field, which can influence the performance of the probe by bending electrons in the photomultiplier.
Testing is done with a Cs-137 doped spark gap lying on the workbench.
I use my old Hameg 15 Mhz scope to view the pulses. It is fine for general electronics, but the steep pulses from the PMT are difficult for the scope to display properly. I need to get a better scope or just put a RC filter in line with the probe to lengthen the pulses.
The other day I discovered this bee in the act of discovering. Taken with a Canon 60mm USM Macro lens. Type L for a better view.
Our Daily Topic - Discovery - 8/21/13