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  • Telephone account using a calculator and cob principle

    2016-02-15 05:25:1570

    This article describes a telephone account using a calculator and cob principle. In order to better grasp the principle of combining text, please under...

  • Telephone Hold Button Circuit

    2016-02-15 05:09:4371

    Telephone Hold Button Circuit Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that...

  • Loud ringer for phone (KA2411)

    2016-02-15 02:04:5365

    This article describes Loud ringer for phone (KA2411). The content is very simple, very helpful. Components in this article can help you understand bet...

  • HeadBanger Headphone Amp

    2016-02-15 01:42:1774

    HeadBanger Headphone Amp After the euphoria over receiving my new Sony Minidisc bundle had partially subsided, I noticed that the portable unit, the MZ...

  • FM Telephone Bug

    2016-02-15 01:34:2267

    Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequ...

  • Motorola MC34118 Speakerphone Adapter Circuit

    2016-02-15 00:59:27269

    A pocket speakerphone adapter for a landline-based common telephone to provide the common telephone with speakerphone capabilities.The conventional han...

  • How to build Telephone Ringer

    2016-02-14 21:19:4462

    Circuit diagram: Description If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. It’...

  • Telephone music on hold interface CIRCUIT (BC556)

    2016-02-14 21:06:1074

    This article describes the Telephone music on hold interface CIRCUIT (BC556). The content is very simple, very helpful. Components in this article can ...

  • A JFET-MOSFET Headphone Driver

    2016-02-14 20:18:38293

    This headphone buffer is based on Greg Szekeres MOSFET Headphone Driver. It is a robust and reliable zero feedback, class A circuit. [Editor: And like ...

  • Microphone preamps circuits using 2N4403

    2016-02-14 19:01:32372

    2 inputs Preamps Microphone Mixer circuit using BC549, 2N4403, TL071 5 inputs Preamps Microphone Mixer circuit using TL081 Choosing a good power amplif...

  • Cellphone Charger Using Bike Battery

    2016-02-14 18:43:2268

    This is the simple and easy way to tap current from a Motor Bike battery to charge the Mobile Phone. Most of the Mobile Phone battery pack has three 1....

  • Cut Phone Line Detector electronic circuit diagram

    2016-02-14 18:00:3367

    A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn't take me long to find this circuit in Electronics ...

  • A Friendly Charger Schematic for Mobile Phones

    2016-02-14 17:03:2164

    Charges and protects your mobile phone from voltage spikes and short-circuit Most mobile chargers do not have current/voltage regulation or short-circu...

  • How to build 3.6 Volt cell phone battery meter

    2016-02-14 16:16:4564

    Discription This is a similar circuit to the above and provides a 4 LED bar graph indicating the voltage of a common 3.6 volt Lithium - Ion recharable ...

  • Mobile Phone. How it works?

    2016-02-14 14:46:57156

    A mobile phone is an electronic device used for mobile telecommunications over a cellular network of specialized base stations known as cell sites. A c...

  • Electrodynamic microphone Speech with XR-T5995

    2016-02-14 14:45:51130

    A microphoneis an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.A type of microphone in which incident soundw...

  • Balance Input for Microphone Line

    2016-02-14 14:36:0567

    Figure 1 The circuit was designed for providing a microphone line with a balance input signal to improve the quality of sound with sufficient gain and ...

  • How to build FM Telephone Bug

    2016-02-14 14:34:4863

    Description Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radi...

  • Nokia 9000, 9000i Communicator cell phones

    2016-02-14 14:32:3961

    for data/flash cable only 12 pin plain cellphone specialconnector at the mobile phone Mobile phone interface pin Description 3 MBus 8 FBus TX 9 FBus RX...

  • Wireless Fm Microphone

    2016-02-14 13:15:3167

    A simple FM wireless microphone uses a single BC183C transistor as an audio amplifier. A 2N3565 can be substituted. Ql is an oscillator that is FM modu...

  • Nokia 9300 cell phone internal

    2016-02-14 12:33:5461

    pinout 14 pin Nokia 9300 cellphone specialconnector at the mobile phone (backview) Pin Signal Description 4 Fbus Tx 5 Fbus Rx 6,12 GND 10 Vpp 11 MBus A...

  • Telephone In-Use Indicator(BS108)

    2016-02-14 12:03:1570

    This article briefly describes the Telephone In-Use Indicator (BS108). Although this circuit is very easy to understand, but also very practical. Circu...

  • How to build Phone Busy Indicator

    2016-02-14 11:38:5661

    This circuit may cause problems for some when used. You may want to build a different circuit. Have you ever been using the modem or fax and someone el...

  • Telephone handset tone dial encoder

    2016-02-14 11:20:3898

    This encoder uses a single contact per key keyboard and provides all other switching function electronically. The diode between terminals 8 and 15 prev...

  • Philips SAVY,Fisio 6xx, OZEO, XENIUM, AZALIS cell phones

    2016-02-14 09:59:4163

    for data/flash cable only 12 pin cellphone specialconnector at the mobile phone Pin Number Pin Name Direction Description 8 RX 9 TX --> 12 GND --- Xeni...

  • Telephone transmitter

    2016-02-14 09:00:3069

    Description. This is a simple, but very useful circuit that can be used to transmit telephone conversations. When the telephone receiver is on hook the...

  • Protection For Telephone Line(V250LA4)

    2016-02-14 08:48:5267

    This article briefly describes Protection For Telephone Line (V250LA4). This principle is easy to understand, but also very practical. Depth understand...

  • Analog Signal Transmission Over Telephone Lines

    2016-02-14 04:41:5770

    Telephone line is designed to carry audio signal, which is an alternating current in nature. To transmit measurement signal, which has very low frequen...

  • Sony CMD 1000 cell phone

    2016-02-14 04:27:3863

    full pinout 14 pin Sony CMD cellphone specialconnector at the cellular phone Pin Description 1 Power ( 9V) 2 Battery charge 3 Handsfree sos 4 Handsfree...

  • Telephone ringtone generator circuit

    2016-02-14 03:42:3373

    This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simula...

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