I am building a project where I plan to have a current controlled oscillator based on a 555. The oscillator is controlled using current source I1 (a current mirror) charging capacitor C2 in lieu of the usual charging resistor. The current provided by I1 varies depending on some other parts of the circuitry and is supposed to affect the frequency of oscillation at the 555's output.
My questions are:
- Is this circuit correct and suitable for building a current controlled oscillator? I am also interested in better circuits if any.
- How can I compute the frequency and duty cycle depending on the current delivered by I1 and the values of R1 and C2?