Cheap Laser Pointers

I picked up some of these cheap laser pointer in Shenzhen, then proceeded to order a bunch more on eBay, they’re about 5USD each shipped. The purple laser shown above had no mW rating. But they generally claim to be 1 or 5mW. I hooked a purple laser up to a PSU and it drew …

+/- 13V PSU Board Bring up

I received the Power supply boards from OSHPark today and built them up. A few patches were required, but a lot less than the DAC board. The board is designed to provide the 5V reference and +/- rails for the DAC board. The DAC board needs rails 2.5V greater/less than the references. I’m using 10V …

Cheap Shenzhen Inspection Microscopes

Well I finally got round to playing with the inspection microscopes I picked up in Shenzhen. If I remember correctly the whole system came to about 80USD. The purchasing process is almost as exciting as the price, you need to buy the optics from one place, the CCD PCBs from another, and the CCD chassis …