On Wed, 25 Oct 2000 08:58:08 +0800 robsymmans writes: > Hi All, thought I'd try to draw on the groups experience. > > I need some heaters to warm some optical elements. A long time ago I > remember seeing some small heaters which were fitted to crystals in > radio > gear for temperature stabilisation. I know this can be done using > power > resistors, pwr transistors etc but I am really looking for a compact > "made > for the job" solution. > Does anyone know of a manufacturer of these heaters. > best regards > rob > > -- I recall someone, perhaps CTS or murata, making self-regulating thermistor heaters (PTC thermistors that heat to some set temperature when across a voltage source). It just clipped onto the crystal. Pretty neat. Another approach might be to get an LM399H, take it out of its little plastic case, then use it as a constant temperature heater (assuming it's the right temperature). Harold > FCC Rules Online at http://www.hallikainen.com/FccRules/ ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERNET! Juno now offers FREE Internet Access! Try it today - there's no risk! For your FREE software, visit: http://dl.www.juno.com/get/tagj. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics