— PROJECTS —

Hi — I am Keith Snook — Since leaving the BBC in 1995 and starting d.c. ~ daylight ltd we have helped many companies big and small with Analogue RF and electro-optic design and have supported many "interesting" projects some of which are listed below
Kanji Wood [Afan Forest] Sound Sculpture Following the laser linked sound installations in the Liverpool cathedrals I was asked by the same "Artist" to design a control and efficient amplifer PCB for a solar powered sound installation hanging in the trees in Kanji Wood — Afan forest South Wales
			Me —up a tree— Fitting a custom regulator I designed to efficiently solar power and control the 3 sound pods [below] with thier separate battery supplies The sound pods are triggered by movement and could be set off by animals or gust of wind during the night so the solar panel is also used to turn off the pods when the battery would become run down
Suspended between a triangle of pine trees [look carefully] 3 stereo sound pods hang ready to emit sounds of the forest and its history to passers by The control system and amplifiers for the pods had to be be very efficient so Class D amplifiers were used and to further increase efficiency the "H" bridge supply was envelope modulated using information from a custom modified MP3 player ahead of the signal output

Hope Street [Liverpool] Project As part of the celebrations for "Liverpool 08 City of culture" I provided design consultancy for the laser links between the two Liverpool Cathedrals and the magneto acoustic drive for the stringed instruments used within the Cathedrals as well as installing the Laser links and and network equipment
			Testing the Visibility of a Photop 50mW Analogue Modulated laser module [designed by d.c. ~ daylight] shinning from the Anglican to the Catholic Cathedral along Hope Street Liverpool Summer 2008 I connected the 2 churches with beams of low power infra red light transmitting audio signals between their sound systems — The intent of the project was "highlighted" in September 2008 when I installed a 2W green laser along the same route — see BBC News — programme
One advantage of working on such an interesting project is that you get to go places and see things that as a member of the public you would not normally see The picture on the right was taken from a balcony inside the Anglican cathedral while we were investigating cable runs between the laser audio link in the tower and the sound booth at ground level
			Even more remote — Inside the tower of the Catholic cathedral can only be reached by climbing the outside of the building and then climbing through a door in one of the glass panels - It's a long climb with safety harness and often a lot of tools but the view both inside and outside is worth the effort This large area of coloured glass makes an ideal termination for the high power green laser which along with safety precautions at the Anglican cathedral end ensure the system cannot cause harm to anybody

ESA ACES— SHM HDO—PA
Feb 2008 — My Space Qualified Engineering Model of the Hydrogen Dissociation Oscillator Power Amplifier (HDO—PA) for the European Space Agency Atomic Clock Ensemble in Space or ESA ACES Project The amplifier powers a coil antenna whose RF field dissociates hydrogen molecules at low pressure into a "plasma" of H atoms which provide the frequency reference for an active Space Hydrogen Maser (SHM) — to create an accurate Atomic clock
			How does a small engineering company test a HDO-PA without access to the rest of the Space Hydrogen Maser Physics Package ? Apart from the usual tests made with RF analysers etc — The final check is — Can it induce a plasma in a low pressure gas vessel — The answer as you can see is yes and it does this with much higher efficiency and in a smaller space than the tight specification required

Laser Diode Modules
	In 1997 I joined Vector Technology ltd. to work on a project for Marconi Communications to design a trackside to moving train laser video link for the Chek Lap Kok Airport railway in Hong Kong
Following successful completion of the project in 1998 I contracted to Vector Technology to give their OEM laser modules linear 100% modulation and to design a range of complimentary optical detectors
		Further work developing laser modules for Imatronic — Vector Technology limited and RGB Uniwave led me to solve many of the problems with linear modulation of green lasers which despite having naturally very non linear characteristics have better than 1% linearity and 100% modulation using my control circuits
Some OEMs or end users that have benefited from my experience with diode laser modules either directly or through my work with Vector Technology ltd. and RGB Uniwave ltd. are — Sick AG — Optos — Photop— Orex medical — Richmond Chemring — Laser Projection Technologies — Sunkist — Corus — Laser modules from the RS catalogue and the majority in Farnell also use my design and concept using some non standard electronics and thermally balanced PCBs If you have application specific requirements requiring Diode Lasers and or associated optical detectors please contact me or RGB Uniwave ltd.



Also see CAPABILITIES