Di box Lab Report Example | Topics and Well Written Essays - 500 words

Di box - Lab Report Example The basic function was to enable the sound engineers to lay long lines of three core balanced cable between musicians and the engineer, who might be seated at the far end of the venue. In order to send him proper and noiseless signals, one would require balanced lines with high impedance. But the electric guitar, bass guitar, electric keyboard or the drum machine outputs are all unbalanced and low impedance outputs of around 50 kilo ohms. In order to convert it into impedances of around 3 kilo ohms, DI boxes are employed. They basically consist of an impedance matching transformer. A transformer consists of two coils – the primary and the secondary. The number of turns in each actually determines whether it is a step-up, a step-down or just an isolating transformer. Having a transformer also serves another very important purpose – isolation between the input and output signals. This helps to keep the expensive musical instruments out of the way of damage by the intrusio n of unwanted electrical impulses such as an accidentally switched on phantom power in the mixing console. In DI boxes, however, a step-down transformer is used. The number of turns in the primary coil is more than in the secondary coil. Therefore lesser amount of current is induced in the secondary coil, resulting in a mic level output (around -30dBV), from a line level input (around -10dBV).