A simple SAWtooth wave generator:
Schematic is from VK2ZAY and the current source my contribution. Incidentally I didn't tested the original design so don't know which is better...probably not mine!
Now the output of the schematic:
Wave form with an 10uF capacitor:
here with 4.7uF capacitor and final configuration for now:
DC out is 2 to 7V approx (Vcc 9V).
The last wave feeding the oscilloscope horizontal circuit
Here the assembly:
designs using discrete components I might test.
Have a nice week!