All items tagged with phone and Gerber (31)

1-01-2004 | A headphone amplifier with outstanding sound quality can be built using readily available modern components. Omitting the output transformer...

1-11-2003 | The directional microphone published in the July-August 2002 issue of Elektor Electronics does its job, but does not have the right directio...

1-10-2003 | It is not just power amplifiers that can deliver the much sought-after warmth of the ‘valve sound’ — headphone amplifiers can too. What is s...

1-09-2003 | In spite of alternatives based around the Internet, SMS and e-mail, the good old DTMF remote switch still has its place, and, thanks to the...

1-07-2003 | A fieldstrength meter is all you need for a quick go/non-go check on the transmitter section (TX) in a GSM phone (900 MHz or 1800 MHz), a DE...

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...

1-05-2002 | 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...