As the Rb has run for 3 days the light is brightening. Its gained .4 volts and is at 7.7vdc. So thats a very good sign I was concerned it might ramp down as it does when first turned on. I think several things could be done on the next one that starts to fail. Check the oscillator components. Why won't is start reliably in the 85 Mhz region. That would easily add 1 V additional to the lamp. Still not crazy about the 17/22 volt regulator circuit design and method of operation clever as it is. I would change it to a 3 term adjustable regulator and switch in a additional resistor to lower the voltage on lamp ignition. Also add some hysteresis to that circuit to allow the lamps to operate further down the brightness curve.
Curious question why even keep the boards surrounding the oven. Given that we tend to put these things in boxes the boards can be folded out and kept away from the heat. This would also easily allow all boards to be adjusted and repaired. Anyhow I think this wraps this thread up. Thanks for all of your comments and suggestions along the way. Regards Paul WB8TSL On Wed, Feb 16, 2011 at 4:26 PM, paul swed <paulsw...@gmail.com> wrote: > Maybe get a1980s strobe light and some fiber and pipe it in. > If you read through the thread though indeed the heat gun at 300 degrees > did recover the rb lamp nicely and I am burning it in for several weeks to > see if it stays lit or decays. > > > On Wed, Feb 16, 2011 at 2:27 PM, Oz-in-DFW <li...@ozindfw.net> wrote: > >> And cold fluorescent tubes. I can often get my attic fluorescents to >> start with a bright flashlight applied close to an end. >> >> On 1/22/2011 5:05 PM, Bob Camp wrote: >> > Hi >> > >> > Neon bulbs do the same thing. The ignition voltage is light sensitive. >> If you see a place they are being used as a voltage reference, they get >> painted black. >> > >> > Bob >> > >> > >> > On Jan 22, 2011, at 6:02 PM, WB6BNQ wrote: >> > >> >> Paul, >> >> >> >> The LED thing is interesting. Are you sure you were not just seeing a >> reflection >> >> of some sort ? >> >> >> >> Bill....WB6BNQ >> >> >> >> paul swed wrote: >> >> >> >>> Other thing, measuring ignition time. On the first run just for the >> heck of >> >>> it I flashed a led light into the ampule and it ignited instantly. So >> >>> perhaps for old hard starting end of life RB lamps this might be a >> trick to >> >>> at least get it going for a bit longer. >> >> >> >> _______________________________________________ >> >> time-nuts mailing list -- time-nuts@febo.com >> >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> >> and follow the instructions there. >> > >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> >> -- >> mailto:o...@ozindfw.net >> Oz >> POB 93167 >> Southlake, TX 76092 (Near DFW Airport) >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
