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  • Mobile Cellphone Battery Charger(NE555 )

    2016-02-07 15:20:2373

    This article briefly describes the Mobile Cellphone Battery Charger (NE555). This principle is easy to understand, but also very practical. Depth under...

  • Classroom Microphone(LM380 )

    2016-02-07 12:56:1971

    This article briefly describes the Classroom Microphone (LM380). This principle is easy to understand, but also very practical. Depth understanding of ...

  • Mobile Phone Battery Charger

    2016-02-07 10:07:2167

    Small and portable unit, Can be assembled on veroboard Mobile phone chargers available in the market are quite expensive. The circuit presented here co...

  • Answering service Telephone Message Taker Circuit

    2016-02-07 09:37:3093

    Message takers are a Telephone answering services and virtual office assistant based in the Midlands .Take telephone messages electronically and delive...

  • Cell phone detector aka mobile bug

    2016-02-07 09:29:48310

    This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellpho...

  • Mobile Phone and iPod Battery Charger

    2016-02-07 09:06:3364

    Charge your iPod without connecting it to a computer! Using the USB port on your computer to charge your players batteries is not always practical. Wha...

  • Intercom System with Telephone-Based Door Entry

    2016-02-07 07:41:1563

    Figure 1 The circuit provides a simple illustration of a door phone intercom system having a two-way communication using the features of LM386 amplifie...

  • Nokia 3210 cell phone internal

    2016-02-07 06:21:5465

    full pinout 6 pin Nokia 3210 cellphone specialconnector at the mobile phone Pin Number Pin Name Direction Description 1 BTemp 2 TX --> 3 GND --- 4 MBUS...

  • Telephone Tone Ringer Chip Circuit

    2016-02-07 03:41:2876

    The 34017ATone Ringer derives its power supply by rectifying the AC ringing signal. It uses this power to activate a tone generator and drive a piezo-c...

  • Dual synchronous telephone toll totalizer circuit

    2016-02-07 02:45:5771

    Totalizers are the simplest and most common type of counter, used in a variety of applications where accurate totals are needed.The Telephone loll Tota...

  • An FM Phone Bug

    2016-02-07 02:26:0763

    This article describes an FM call Bug. The circuit is simple, inexpensive, and effective. As long as Duokanjibian The schematic can master the principl...

  • Nokia 8910 cell phone internal

    2016-02-07 00:39:3262

    for data/flash cable only 12 pin Nokia 8910 cellphone specialconnector at the mobile phone Pin Number Pin Name Direction Description 1 Tx 2 Rx 3 Vpp 4 ...

  • Philips 855 cell phone interface port

    2016-02-07 00:25:0564

    3 pin stereo jack maleconnector at the mobile phone cable (2.5 jack used) Pin Signal Description R Tx L Rx GND GND Source:www.pinouts.ru Reprinted Url ...

  • Watch-Dog For Telephones(NE555)

    2016-02-06 23:31:0663

    This article briefly describes the Watch-Dog For Telephones (NE555). This principle is easy to understand, but also very practical. Depth understanding...

  • Ericsson phone to PC serial port interface CIRCUIT (RS232)

    2016-02-06 22:03:3263

    This article describes the Ericsson phone to PC serial port interface CIRCUIT (RS232). The principle is very simple, very practical. The circuit compon...

  • Mobile Phone and iPod Battery Charger(MC34063A)

    2016-02-06 19:43:53290

    This article briefly describes the Mobile Phone and iPod Battery Charger (MC34063A). This principle is easy to understand, but also very practical. Dep...

  • How to build Speaker Microphone Circuit

    2016-02-06 19:29:4969

    Description: This circuit takes an ordinary loudspeaker and allows it to be used in reverse, as a microphone. Circuit diagram Notes: This circuits allo...

  • Panasonic P341i, X11, X70, X80, X88 cell phone

    2016-02-06 18:26:3763

    for data/flash cable only 14 pin Panasonic X70 cellphone specialconnector at the mobile phone (gap between 2 and 3 pin, keypad up) Pin Signal Descripti...

  • Nokia 9110, 9110i, 9210, 9210i, 9290 Communicator cell phone

    2016-02-06 18:17:1661

    full pinout 11 pin Nokia 9210 cellphone specialconnector at the mobile phone Mobile phone interface pin Description 1 GND 2 Charger Input 3 Charger Out...

  • Telephone line for speech voice activity detection

    2016-02-06 17:31:40121

    A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communication system. Typic...

  • How Dynamic Microphone Works

    2016-02-06 17:03:5279

    A dynamic microphone is an example of dynamic transducer. The principle of dynamic transducer is a movement of a thin metallic diaphragm because of sou...

  • How to build A Friendly Charger Schematic for Mobile Phones

    2016-02-06 16:57:1566

    Description Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging t...

  • Phone line in use indicator (BF256B)

    2016-02-06 15:32:4573

    This article describes the Phone line in use indicator (BF256B). The content is very simple, very helpful. Components in this article can help you unde...

  • Remote telephone line extension bell ringer circuit

    2016-02-06 14:16:4971

    The telephone-line extension bell ringer shown will enable you to add a remote ringer in your garage or some other area where a ringing telephone canno...

  • Nokia 5100, 5100a cell phones internal

    2016-02-06 13:33:1265

    for data/flash cable only 12 pin Nokia 5100 cellphone specialconnector at the mobile phone Pin Number Pin Name Direction Description 2 GND 3 MBUS 4 Vpp...

  • Dynamic microphone to electret microphone input (BC547B)

    2016-02-06 11:40:4573

    This article describes the Dynamic microphone to electret microphone input (BC547B). The content is very simple, very helpful. Components in this artic...

  • Samsung A100, A110 cell phones

    2016-02-06 09:54:1264

    for data/flash cable only 6 pin Samsung cellphone specialconnector at the mobile phone Mobile phone interface pin Description 0 GND 1 Vpp 2 Data-In 3 D...

  • 4 microphones mixer circuit with TL081

    2016-02-06 09:01:55115

    A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is abou...

  • Reuse Old Mobile Phone Battery

    2016-02-06 07:49:5081

    This article briefly describes the Reuse Old Mobile Phone Battery. This principle is easy to understand, but also very practical. Depth understanding o...

  • Automatically timed telephone ring silencing circuit

    2016-02-06 07:12:3771

    Apparatus is provided for automatically silencing a telephone ringer. In accordance with one aspect, the apparatus places the telephones ringer under t...

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