How does this specific boost converter work?
how it works:
current builds up in the inductor until it's enough to turn Q3 on  this activate the 555's ~RESET  turning off the 555 out and turning off Q1, the 555 discharge pin is used to turn the Q1 off rapidly, this helps produce the hiogh voltage.
C3 now discharges through R3 until the voltage on TRIG is low enough to turn the 555 output back on.