Tag: electronics

Radio Shack Files for Bankruptcy

Like most electronic hobbyists, I have an odd relationship with Radio Shack. In our youth it was the one local place you could buy basic components… Resistors, connectors, wire and other parts could be found there, without waiting a week for an order from a mail order catalog. The selection was always pretty sparse, the quality was hit or miss, and the prices were too high. But, if you needed something quickly it was the place.

Radio Shack Waimea
The Radio Shack location in Waimea in the KTA center
I even worked in a store for a summer in high school, learning what it was like on the other side of the counter. An experience that left me wondering why anyone would want to work in retail sales.

Then for many years, through the 90’s and the early part of the 00’s Radio Shack neglected the hobbyist business, concentrating on cell phones and accessories. Recently they have returned to their roots, restoring the kits and components section of the store. This time with Arduinos and other more modern technology. It was a move that many in the electronics community greeted with some enthusiasm.

Still, in recent visits looking for a last minute component I have found the selection just too minimal to be truly useful.

Word that Radio Shack is filing for bankruptcy and closing 1,750 stores is no surprise. According to news report the corporation claims $1.2 billion in assets and $1.4 billion in liabilities.

Apparently our local store in Waimea is not slated for closure in this first round. The future of any particular store is far from certain. Sprint has agreed to purchase many of the closed stores, but details are far from complete. Certainly many of the stores occupy desirable locations and are ripe for acquisition.

What emerges from bankruptcy will be interesting to see. But my guess is that the Radio Shack that has long been a fixture in our lives is gone.

Postcard from the Summit – Supplies

The summit of Mauna Kea is a long way from anywhere on this island. If something breaks we really need to have the parts on-hand to fix it. The result is that just about any unclaimed space in the building is used to store spare parts. We have stuff stashed everywhere!

This goes for the electronics lab too. A little bit of everything we might need is available. Now you just need to spend a few months learning where to find everything…

Supplies
Racks and bins of supplies in the Keck electronics lab.

Yeah, It Was One of Those Days

Can anything go smoothly? Please?

A simple job. Get an 80 pound optical interferometer back under the bench. Nothing like two guys setting the thing on my chest so I can worm my way underneath and heave this beast back onto it’s shelf. Then we have to bolt the fold mirror back in place, another thirty pound piece of awkwardness, just hold it in place to get the bolts in. I hold while Olivier tries to thread the bolts. We also have to replace the pellicle, a bit of ultra-thin optical film that will break if you touch it. Then there is an hour spent aligning the thing. chasing my tail trying to get a properly centered image of the deformable mirror. Sometimes optical alignments just go that way. I finally got a decent image, just to learn there was some vibration in the system. I adjusted some shims to reduce the issue, but there is more to be done.

Much of the remaining day is spent troubleshooting a simple optical shutter in the K1 laser. It fails to completely open. When it fails the safety system detects the failure and shuts down the entire laser. A couple hours of checks later has me convinced that the hardware is working, more or less. The design could have been better. The critical issue is the tight timing requirements. The circuit expects the mechanical shutter to actuate in 50ms, it used to, but as it has been used for a few years, it doesn’t any more. Why they did not simply allow a few hundred milliseconds I have no idea, dumb design, there is no issue with a longer timing window.

One of those days
One of those days on the summit in the K1 laser enclosure
Of course I can not simply change the timing. It is hard coded into a Xilinx CPLD. Give me a few days to setup the Xilinx software, another day or two to understand the code, then maybe I could fix it. I have one day, then the laser is scheduled to be on-sky. Great, time to use my hacking skills to dream up a solution in one day… Tomorrow.

There is a camera in the laser enclosure. We use it for tele-presence. As I worked, Pete, our laser engineer, was on the phone assisting from headquarters. He could run the software remotely and watch as I probed the system to measure the timing. Unbeknownst to me, Pete saved a couple images from the camera and sent them to me. The photo does reveal the day I was having. Thanks Pete… I think.