Miracle electronics devices pvt. Ltd. An iso 9001: 2000 certified company is offering volume control audio attenuator. The company is the manufacturer of all types of toroidal transformers, ferrite core transformers ,laminated transformers, flat - ui transformers, smps and other voltage controlled devices. This volume controller is made of using 100v transformers. It consists of 11 volume steps including 10 regulator steps and 1-zero position. It is also provided with a 24vdc e/m relay , by which emergency announcements are done even if at position `0`. This is available in various models like vc - 025 [25 w], vc - 030[vc - 030], vc - 036[36 w], vc - 050[50 w] and vc - 060 [60 w].