Hi all, first , great site where I will no doubt now spend vast portions of my life. I'm a virtual beginner in electronics but not too stoopid. After a spectacular motorcycle crash I was helped by a great physio who I'd like to repay with a project. Tabata - is a 4 minute exercise program consisting of 20 secs work 10 secs rest 8 times before collapsing. Following my accident I have played with audio circuits and preamp but I'd really like to make a Tabata timer for my physio. I have looked at 555, 4017 and RC circuits and am bemused slightly about flip flops but before experimenting I must admit I'm a bit conceptually lost in getting the WHOLE project to be automatic. I'd really like some pointers if possible. I would like my timer to do the following: Switch start (SPST) then 17 sec silence and 3 warning beeps (or a continuous 3 sec alarm)-total time 20 secs. After that the 10 sec timer begins, 7 secs silence then 3 more beeps (or a continuous 3 sec alarm). This repeats 8 times then stops (I imagine a boxing round type bell going off.) The projects may then be built into a Kendo type stick (or hand grenade!) or something bizarre. Many thanks.