greetings, I am building a 10mhz xtal frequency standard and am looking for a circuit diagram for a simple temperature regulator. I have the oscillator running in a small cast aluminum box and my idea was to bolt a power transistor to the case and use that as the variable heating element. I would then mount the whole unit inside a block of foam insulation. I would like to hold the crystal at a non critical temperature between 35-50C. Any ideas? cheers -- ===================================================================== Lawrence Glaister VE7IT mailto:lg@jfm.bc.ca 1462 Madrona Drive http://jfm.bc.ca/ Nanoose Bay, B.C. http://members.home.com/cncstuff Canada V9P 9C9 http://gspy.sourceforge.net ===================================================================== -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu