555 Timer? Input sawtooth 0-8 volts, Output pulse variable duration

555 Timer? Input sawtooth 0-8 volts, Output pulse variable duration

This is what I want to do.

Input: sawtooth from 0-8 volts with freq of 30 Hz to 60 Hz

Output: a pulse when input is at a user set voltage between 1-7 volts.
The pulse output is adjustable voltage (3-9v) and duration (5uS to 2mS)

I'm flexible, it is not super critical. I just need a stable trigger even if it has some delay.

If some one can draw out a circuit I would appreciate it.
The 555 timer seems to be the way to go?

Thanks

Here is my hack. The pulse height is 8.2V. I'll let you figure out how to make it variable.

I don't see the need for a 555, surely two comparators could do the job?