the invention is a firing circuit for an exploding bridgewire explosive detonator which is activated only by application of an alternating current of a preselected frequency . the firing circuit comprises a bandpass filter , a voltage multiplier , and a discharge circuit . the invention can be configured to selectively detonate a plurality of exploding bridgewire detonators by assembling a plurality of firing circuits for each exploding bridgewire , each firing circuit having a bandpass filter with a different preselected frequency .