Electronic ignition with advance

摘要

A trigger circuit comprises first, second and third triggerable switches each being rendered conductive when a signal at its control terminal reaches the threshold level. The first switch is connected to accept a timing pulse signal. The first and second switches are connected in series with each other and a control terminal of the third switch to activate the third switch when both the first and second switches have become conductive. A delay circuit is in series with the first switch and in parallel with the gate and one other terminal of the second switch. A time delay is introduced after the first switch is activated by the timing pulse signal and before the second switch is activated to thus trigger the third switch.