IIRC, some Wien bridge oscillator circuits use an incandescent bulb as a ballast to control their oscillation rate. Maybe that would be a good place to start looking for information? Mike H. On 1/4/07, Harold Hallikainen wrote: > I'm considering using an incandescent light bulb as a current limiter in a > circuit, but having trouble finding voltage versus current data for light > bulbs. All my Google searches turn up consumer info on people that want to > sell me light bulbs. Using the term ballast turns up stuff on fluorescent > lamps. Using constant current turns up stuff on LEDs. So, anyone know > where such data may exist? > > THANKS! > > Harold -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist