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Detonator apparatus, such as a blasting machine detonator, is provided with a miniature transformer having multi-turn primary and secondary coils. The transformer feeds a bridge wire detonator element, and has sufficient impedance to permit impedance matching with a carrier that may be as long as 75

Detonator apparatus, such as a blasting machine detonator, is provided with a miniature transformer having multi-turn primary and secondary coils. The transformer feeds a bridge wire detonator element, and has sufficient impedance to permit impedance matching with a carrier that may be as long as 7500 m. The impedance of the detonator is such that the detonator resists firing when subject to stray currents or commonly present power or communications signals. A blasting machine is provided that is specifically designed to provide a signal having a frequency in the range in which the detonator is sensitive. The blasting machine relies upon semi-conductor switching and timing circuits to control the discharge from a pair of capacitors, rather than upon an output transformer.

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1. A blasting machine for producing an electrical multi-pulse detonation signal for setting off a signal selective detonator, comprising:a charge storage system including a capacitor; an output port from which the multi-pulse detonation signal can be sent to the signal selective detonator; a switchi

1. A blasting machine for producing an electrical multi-pulse detonation signal for setting off a signal selective detonator, comprising:a charge storage system including a capacitor; an output port from which the multi-pulse detonation signal can be sent to the signal selective detonator; a switching system including a semi-conductor switch connected between said capacitor and said output port, said semi-conductor switch being operable to control current flow between said capacitor and said output port; and a discharge control system including a wave generator connected to said semi-conductor switch, said wave generator being operable to cause said semi-conductor switch repeatedly to conduct and to interrupt discharge of current from said capacitor through said output port to produce the multi-pulse detonation signal.