| It’s too good to be true, and the laws of thermodynamics say it isn’t true, but it’s still a persistent dream: free energy. It also seems a...
More about Energy (140)
| If a relay is driven by a transistor switching stage it is usual to connect a flywheel diode in parallel with the coil to short out the back...
| When dealing with relays we distinguish between the pull-in voltage and the hold voltage. Depending on the type of device, the latter is fro...
| Miniature radio controlled cars are great fun for the armchair rally enthusiast but once the novelty has worn off or the car suffers a mecha...
| If the effort of chasing out channels and replastering for a complete new circuit is too much, then this circuit might help. Normal operatio...
| Being mindful of our delicate environment starts at home with a thorough hunt for all electrical equipment large and small that’s wasting en...
| Despite our best efforts, a lot of energy is still wasted imperceptibly. We insulate our homes, install high efficiency boilers and buy low...
| Some relays will become warm if they remain energised for some time. The circuit shown here will actuate the relay as before but then reduce...
| The word ‘free’ is always sure to trigger reader response but we’d say hold your horses. Here, the word should be taken to mean ‘liberated’...
| Apart from the sun, solar power systems cannot work without a reflow protection diode between the solar panel and the energy store. When c...