Electrical circuit for firing mines - has transistors diodes and resistors to protect against short circuits due to mine firing

摘要

An electrical circuit for firing mines is protected against overvoltage. It is fed by 27 volts DC and the negative terminal is connected between the output terminal (12) and earth. a PNP type transistor (Q1) limits current between the + terminal and the output terminal(12). A resistance(R1) between the transistor emitter and the + feed terminal, has a low value and the base of the transistor is polarised to block it at low potential. Several diodes(D1, D2, D3, D4) are blocked also. Diodes(D1-D4) have controlled polarisation and there are further transistors(Q2, Q3). The circuit protects against short circuits after firing the mine, which can occur in the firing element.