In message <01bd785e$874ef6c0$922cccd0@gcouger>, Gordon Couger writes >From time to time I have thought soft x-rays should erase OTP chips. >has anyone tried it. A soft x-ray source can be made from a vacuum >tube. If any one thinks it is sound I can probably set up a trial. > >Gordon This has been discussed several times on the sci.electronics.design NG. Some people have actually tried it, using dental X-ray sources, for instance but I can't remember if it worked. You should be able to dig the posts up from the archives. Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/dds.htm for details of my AD9850 DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.