Pronunciation intercom system is exploded in this security protection of oil depot

Pronunciation intercom system is exploded in this security protection of oil depot, it relates to a pronunciation intercom system. The utility model discloses a current explosion -proof effect of oil depot intercom system is poor, bulky and heavy in order to solve, the poor problem of communication effect. The utility model discloses a this ampere of converting circuit is connected through mike's input terminal, speaker input terminal and intercom push key input terminal respectively to microphone, speaker and intercom push key, and this ampere of converting circuit's output is switchoverred terminal, speaker switching terminal and intercom push key switching terminal through mike respectively and is connected the extension board, and explosion -proof mainboard passes through to establish bi -directional data transmission between signal processing switching terminal and the extension board and is connected signal processing input terminal connection communication bus. The utility model discloses small, signal transmission is stable, and is undistorted, has good communication effect.