All items tagged with Construction and Theory (17)

| Last month we examined the basic theory of loop antennas, and demonstrated some of the basic forms of loop antenna, resonating methods and...

| Although it is bound to be replaced within a foreseeable period by environmentally safer types, the nickel-cadmium (NiCd) battery is still...

| 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...

| 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...