| Although it is bound to be replaced within a foreseeable period by environmentally safer types, the nickel-cadmium (NiCd) battery is still...
All items tagged with Theory and project (16)
| The circuit presented here is a dual thermometer that indicates the difference between the temperature indoors and out of doors with the a...
| To achieve a comfortable room temperature quickly it is often required to switch on the central heating (CH) boller tor ten minutes or...
| BUILD THE OPTICALOCK
| Combination locks are useful because they can not be picked like a 'key' lock can. If a combination lock could sound an alarm before it wa...
| Clocks, as most of you will be aware, can take many shapes and sizes. Here is one with a fairly unusual read-out, intended as an eye catch...
| This month we present an experimental circuit to demonstrate that visible light can be modulated and used as a carrier to convey informati...
| Those of you who have ever spent a summer's day at the beach will affirm that the sun, the wind, the sand and the water can have a repo...
| This month we tackle a high-frequency project by venturing out into the exciting world of VHF radio amateur communication. Build this conv...
| The test instrument presented here is capable of supplying sine-wave, square-wave and triangular-wave signals with an adjustable amplitude...