More about phone (291)

1-02-2003 | Today’s GSM phones have some many bells and whistles that many of us are confused (to say the least) by the plethora of menus and submenus....

1-02-2003 | In this semiconductor age, we find valves being used increasingly often for hi-fi and guitar amplifiers, top-end condenser microphones and s...

1-01-2003 | Using a simple SMS message sent from your GSM phone, two mains powered loads may to be switched on and off independently, or programmed to d...

1-12-2002 | Premium rate numbers (in the UK, generally those starting with 09) are often used as a way of extracting payments from telephone users and I...

1-11-2002 | The usefulness of baby monitor alarms using (FM) radio has always been limited by poor range and its susceptibility to interference. This no...

1-07-2002 | This simple circuit will tell you, by sounding a buzzer and flashing a LED, that a telephone line is in use. If the telephone line is free,...

1-07-2002 | Compared to the other instruments in a band the mouth organ is often not loud enough. Turn up the amplifier, and you risk feedback. What is...

1-05-2002 | A programmed BasicCard is used as the starting point in this article. We show how this ‘SIM card emulator’ can be adapted to test the most i...

1-05-2002 | In some situations and locations, the use of a mobile phone is forbidden. You may be discussing sensitive information in a closed meeting or...

1-03-2002 | The SMS Chip checks incoming text for a password, switches outputs interactively or at preset times, controls an LCD and sends status inform...