About 15-20 years ago, I received an old electronics kit from Radio Shack, back when they still made interesting things. The diodes it came with were in a glass package, and the book that the kit came with even included an experiment to demonstrate this phenomenon exactly. Jean-Paul, note that your messages are getting aggressively flagged by gmail as spam, to the point where I had to create a filter for your email to never send to spam. No matter how many times I mark as "not spam", it still thinks they're spam for some reason. On Thu, Mar 19, 2015 at 10:59 AM, Jean-Paul Louis wrote: > MELF package used for diodes and resistors is a glass tube, so the die is > visible and can be affected by light. > > > Jean-Paul > AC9GH > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .