| The boom in camera phones means you can now pick up tiny snap-on flash guns for a couple of pounds if you know where to look. And if you loo...
All items tagged with light and phone (6)
| To many hi-fi enthusiasts and musicians, the thermionic valve (electron tube), the sound of a valve amplifier cannot be bettered by that...
| The delay circuit ensures that a car's intertor light remains on for about five seconds after all the doors have been closed. This enable...
| In most telephone networks, a direct voltage of 48-60 V exists at terminals a and b. When the call signal comes in, a 50-60 V alternating...
| doorbell — or telephone - operated flash-light elektor november 1983 It was, of course, known before the outbreak of disco fever that flas...
| see the phone ringing In many instances it is not only the hard of hearing who are unable to hear the telephone ringing: even with normal he...