Electronics

Hydroponics is all about growing without soil. In many ways this simplifies the lot of the gardener, but it gives them added responsibility for providing plants with the right level of nutrients. As water with nutrients tastes, feels and looks much the same as plain water, a testing instrument called an “EC meter” or “CF meter” is used.

Don’t try this at home. In the town of Niagara Falls, you are heading along a street. You suddenly overfly a car, then a bicycle travelling along a path near the water. In an instant you are over the lip of Niagara Falls. In a scary moment you find yourself looming over the precipice and then zooming away across the face of the thundering water.

When I left school I took on an apprenticeship at William Cable in Wellington. Unknown to me at the time, this opportunity would lead to a life-long interest in model engineering. My apprenticeship gave me a wonderful grounding in all aspects of engineering.

When Karl Bishop had finished fixing and painting the fence on his newly acquired house he knew he needed to finish it with a gate. A gate would allow the dog to roam safely and it would add an element of security.

STEPPER MOTORS are to conventional DC motors as computers are to calculators – in other words, much moresophisticated. The ability of stepper motors to specify rotation precisely both by velocity and angle opens new doors for movement control. The downside is that to get the most out of these little beauties, you need ancillary digital-pulse control circuits, a fact which may deter some sheddies from exploiting their numerous advantages.