I indeed noticed that too. :o At 22.57 2012.01.08, you wrote: >Am I the only person who saw an attachment to this email which has >nothing to do with this email but rather was supposed to be attached >to the other thread: "[EE]: Single power supply, true-AC-input analog >to digital interface" by Electron? > >I don't know if Gmail messed up (I use Gmail) or if the list did, but >I see a GIF of a schematic attached to BOTH this message and >Electron's. > >Sean > > >On Sun, Jan 8, 2012 at 3:39 PM, Carl Denk wrote: >> I have a standby 240 volt electric resistance furnace with 24 VAC contro= ls. >> Since the electricity costs are large, and usage due to some minor item >> failure on the main fuel supply, I am looking for an brief beep audible >> warning when the unit is powered up. The sound should be very brief (may= be a >> second or less), not an unpleasant tone or high volume. The unit is in t= he >> basement, and should be able to hear it on the 1st floor. This should be >> just barely heard, so as not to startle, or might even choose to ignore = for >> the moment. Cost not a priority since this is one off. >> >> I have thought of using a 555 timer, with a rectifier bridge and a 78XX >> regulator off the 24 VAC circuit and a sonalert sort of noise maker. Als= o >> have thought of a relay that opens it coil circuit when energized, and t= hen >> something to keep the circuit open until next furnace usage. >> >> Any thoughts would be appreciated, and thanking in advance. :) >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> >--=20 >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .