speed drills

i don't have any speed bag or double end bag and i was wondering what kind of drills i could do to increase hand speed; bar of course the pretty obvious 'just hit the heavy bag super fast'

 

Not just on the heavy bag, but throw fast combinations while shadowboxing and while sparring.

 

thats it? just punch fast? :think

 

Shadowboxing. Try not to punch hard but relax your arms and let them fly. Work on technique, most of the gains are in things like not cocking your hand back before punching, being in the proper position to punch, etc.