(category) – Technical

Alternating current (AC)

Alternating Current or AC refers to a flow of electrons that reverses in direction in a cyclical manner

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Amps

Amps (Amperes) measure the flow of current that a potential difference forces through a circuit. The symbol is always A. The name derives from the French physicist André-Marie Ampère (1775-1836). As with Volts, current can be unidirectional – Direct Current (DC) – or alternating in direction (AC), and the values used can be peak or…

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Audio levels

Analogue audio signal levels have historically been categorised for professional usage in two groups – microphone level (low) and line level (high). Domestic equipment generally falls into a third category, just below professional line level. Signal levels are measured using units based on the Decibel. There are many different types of Level Meter used for…

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Balanced line

Balanced lines are typically – and quite incorrectly – explained as follows. A signal is split into two equal but antiphase parts in a balanced line driver. These signals are connected to each leg of a pair cable and eventually arrive at a balanced receiver. This device inverts one leg of the signal. In doing…

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Bright Eyes (Phantom checker)

This “Bright Eyes” device was described by Hugh Robjohns in this Line Up article (June/July 2006) and uses a circuit designed by Chris Woolf. A Bright Eyes can be a very useful tool to have during rigging or fault finding to check if an XLR cable has active microphone powering. It is simple to construct…

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Broadcast Wave Format (wav)

Broadcast Wave Format was developed by an EBU Project Group (see The Broadcast Wave Format – an Introduction) to provide a product-independent means of exchanging programme material between workstations from different manufacturers. It is based on the Microsoft WAVE audio file format (file extension .wav), which is one of a number of file types specified…

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Connectors

Contents 1 Sex 2 XLR 2.1 3 pin 2.2 4 pin 2.3 5 pin 2.4 6 pin 2.5 7 pin 3 Jack 3.1 ‘A’ gauge 3.2 ‘B’ gauge 3.3 MIL-plug 3.4 Bantam 3.5 3.5mm 3.6 2.5mm 4 Hirose 4.1 4 pin 4.2 10 pin 5 Tajimi 5.1 12 pin 6 DIN 6.1 2 pin 6.2…

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Decibel (dB)

The human ear does not react to changes in sound in a simple, linear way. To double the loudness of a sound, say by turning up the volume control on an audio amplifier, most people find that they need to increase the power produced by the loudspeaker by about ten times. If we were to…

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Digital interfaces

This page lists the most common digital interface standards used to connect between digital mixers, recorders, editing systems and microphones etc. Contents ADAT AES/EBU SPDIF SDIF TDIF-1 Mitsubishi ProDigi MADI Yamaha ADAT ADAT is an acronym for Alesis Digital Audio Tape, a format for recording 8 tracks of digital audio onto Super VHS magnetic tape.…

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Direct Current (DC)

Direct Current or DC refers to the unidirectional flow of electrons from high to low potential, as opposed to Alternating Current or AC where the flow regularly reverses in direction at a specific frequency. By convention this flow is considered to be from positive to relatively negative points; note that this direction is not the…

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