Yes, depending on what you mean by "constant". The 555 and its timing components will drift a bit, especially with temperature. You'd never notice if you're flashing an LED but it won't work for tuning an instrument or running a clock. (You'd use a quartz crystal oscillator for those.)Is the 555 a good choice for this...
So? He's not trying to get a 50% duty cycle, but rather a 97% duty cycle.You can use CD 4093 chip and get a 50/50duty cycle using one gate. And uses less current,voltage. [URL="http://books.google.co.uk/books?id=42CiOxcbCxAC&pg=PA14&lpg=PA14&dq=cd4093+oscillator++circuit&source=bl&ots=2-B_YH6w8K&sig=EaN15tZaPBFGJq1mliqSvFCUQz4&hl=en&sa=X&ei=dtXvUanQA4WN0wXC04HgDg&ved=0CA8Q6AEwAw#v=onepage&q=cd4093%20oscillator%20%20circuit&f=false[/URL"] cd4093[/url]
by Aaron Carman
by Duane Benson
by Duane Benson