sequence in the operating cycle of the engine 40 fig2 illustrates an ignition system constructed according to the invention for supplying timed spark discharges from spark plug 11 to an internal combustion engine 40 any number of spark plugs 11 may be used and electrical energy may be distributed to the spark plugs in timed relation to the engine through a distributor not shown as described in u s pat no 3 240 198 direct current power 13 for the system may be supplied by a magneto or generator through a full wave rectifier or any other suitable source such as a battery the voltage may also be regulated by zener diode 15 and diode 17 connected in series across leads 19 and 21 lead 19 is connected to source 13 through a diode 23 and lead 21 is connected to source 13 through an inductor 25 a main storage capacitor 27 connected between leads 19 and 21 is periodically charged by dc source 13 through diode 23 and inductor 25 capacitor 27 discharges when a silicon controlled rectifier 29 is triggered to conduct by a triggering pulse from trigger circuit 50 the capacitor 27 upon discharging will provide sufficient energy through transformer 33 which has a primary winding 35 connected in series with silicon controlled rectifier 29 across leads 19 and 21 and a secondary winding 37 connected in series with spark plug 11 to provide a suitable spark at spark plug 11 an electromagnetic pulse generator similar to that shown in u s pat no 3 252 024 is shown generally as 30 the generator includes a trigger wheel 39 having a plurality of projections or vanes 41 equal.