It's shown here being driven by the Group's MBE expert, Dr Grant Griffiths. (See page 100) On the cover A major tool used by CSIRO Radiophysics Division's pioneer- ing Solid State Group is the MBE system, which grows gallium arsenide and other exotic semiconductor crystals one atomic layer at a time. Much cheaper than sending your meter back for recalibration. Great for the armchair gardener! (See page 90) DC voltage reference Another of this month's projects is a simple unit which provides an accurately maintained source of 8.192V DC, to calibrate your DMMs and other meters. It mates with either one or two mechanical 'distributor taps', to achieve virtually the same result as commercial system costing many times more. 3 Volume 51, No.10 AUSTRALIA'S LARGEST SELLING ELECTRONICS MAGAZINE - ESTABLISHED IN 1922 October 1989 Timer/controller for garden sprinklers t i -,winkier Timmer n., Among our construction projects this month is an ingenious design for a unit to control your garden watering system.
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