Tag Archives: electronics

Dual Poster Exhibition

Yesterday saw the culmination of three years of hard work for our soon-to-be graduands. Final year Media Technology​ students presented their final year projects to the academic team and industry representatives during our annual technology exhibition “poster day”.
Poster Exhibition in The Spark. Photo Credit: Sean Lancastle
We had a new location this year based in the atrium of the new Spark Building; the exhibition benefited from a more spacious feel and was much more visible to passersby. The exhibition was well received by a number of professionals from a range of related industries. This gave the students excellent opportunities to network as well as practising their communication skills!
As usual there was an eclectic mix of sound, vision and acoustics based projects including design and build as well as research projects. It’s great to see what the students have achieved and to hear then talking so knowledgeably and passionately on a professional level.
This year we also held the second years’ ‘managing projects’ exhibition at the same time. The second years have spent the last six weeks intensively completing a group project having planned it earlier in the year. Each group produced a poster summarising their findings and was able to discuss their thoughts with our industry visitors. This was a great opportunity for the second years to get inspiration for their own final year projects and to discuss them with the third years and professionals.
Congratulations to all those involved for an excellent day. Special thanks have to be extended to the technicians and staff that worked tirelessly to prepare the venue and to issue all of the equipment.

A Guest Speaker in Audio Systems

Today students studying Audio Systems were treated to a visit from a guest speaker. The Extron SI 26CT Ceiling Speaker dropped by to show off its coaxial dual driver design and switchable transformer for line distribution applications. The 6.5 inch woofer is situated directly behind a 1 inch titanium-coated dome tweeter in an attempt to provide accurate sound reproduction over a wide angle.

The unit houses a passive crossover to protect the tweeter from higher-power low frequencies whilst allowing its light weight diaphragm to concentrate on the fast turnaround required by higher frequencies. The woofer explains: “I can’t keep up with the rapid movements of HF and simply end up distorting the sound; I’m far more comfortable taking the power of LF and generating the longer wavelengths needed for bass”.

Key to SI 26CT’s visit was the concept of 100 V line distribution systems. A specialist amplifier is used to create high voltage, but low current signals to reduce losses over long cable runs. This is useful in applications such as shopping centres and airports where numerous loudspeakers are spread over a large area resulting in enormous cable runs. Each loudspeaker has its own step-down transformer to reduce the voltage and increase the current so that classic drivers can be used. The transformer reflects a high impedance to the amplifier, hence the current is reduced, but the same power is delivered to the load. Furthermore the SI 26CT features multiple taps on the secondary of the transformer which allows it to produce between 7.5 W and 60 W from the same amplifier. This means that the same amplifier and cable run can be used to supply louder and quieter loudspeakers depending on the throw distance and volume of the space. SI 26CT has found application in Europe at 100 V and in America where they tend to use 70 V systems.

There are alternative systems available, for example active loudspeakers could be used with a separate amplifier combined with each driver. This would allow more control over the output level from each driver but means every loudspeaker unit requires a power supply, which is expensive.

It was great to see an alternative style of audio installation and I’m sure we’ll see SI 26CT and his peers soon in classrooms and shopping centres around the local area.

Get A Taste Of Electronics Fundamentals At Solent

Studying media technology based courses at Solent is not just about learning how equipment is used, we also need to have some understanding how the equipment functions and works. This involves learning basic electronics. Electronic labs are conducted with both lectures and seminars, with the key theoretical information being delivered via lectures which are followed up with labs, helping with hands-on understanding and bringing the theory and practise together.

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