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  • Telephone privacy adapter

    2016-02-10 04:08:1273

    Additions to article made January 2005 Summary of circuit features Brief description of operation: Prevents telephone call to be heard form other teleh...

  • Nokia 8800 cell phone internal

    2016-02-10 02:11:4962

    pinout 7 pin Nokia 8800 cellphone specialconnector at the mobile phone (backview) Pin Signal Description 1 Vpp 2 Tx 3 Mbus 4 Rx 5 GND 6 BSI A GND short...

  • Telephone Ringer

    2016-02-10 01:13:2576

    If you are lucky enough to have a big house, a large garden, and small children, this project just might interest you. Its actually a telephone ringer ...

  • Telephone Ringer Piezoelectric Sound Components

    2016-02-09 21:15:4471

    The Piezoelectric sound components introduced here is also a production utilizing natural oscillation of piezoelectric ceramics. Today, piezoelectric s...

  • How to build Phone Busy Indicator (2N3392)

    2016-02-09 18:45:1164

    This article describes the How to build Phone Busy Indicator (2N3392). The content is very simple, very helpful. Components in this article can help yo...

  • Protection For Telephone Line

    2016-02-09 18:33:5464

    A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed surge protec...

  • How to build Mobile Phone Travel Charger Circuit Diagram

    2016-02-09 18:05:4866

    Description Here is an ideal Mobile charger using 1.5 volt pen cells to charge mobile phone while traveling. It can replenish cell phone battery three ...

  • Telephone in use indicator.

    2016-02-09 17:05:1164

    Description. Here is a simple circuit that can be used as a telephone status indicator. When the telephone is in use (off hook) the transistor Q1 switc...

  • How to build Mobile Phone Battery Charger Circuit

    2016-02-09 16:51:4667

    Description Mobile phone chargers available in the market are quite expensive. The circuit presented here comes as a low-cost alternative to charge mob...

  • BiPAC 6404V(G)P Datasheet for Your Cheap Telephone Calls

    2016-02-09 14:48:5062

    The process that provides customers withcheap telephone callsis known as Least Cost Routing (LCR). One of the best VoIP call which used the world stand...

  • Cellular Phone calling Detector CIRCUIT (D438)

    2016-02-09 14:42:1495

    This article describes a Cellular Phone calling Detector CIRCUIT (D438). The content is very simple, very helpful. Components in this article can help ...

  • Wireless Telephone Line Spy CIRCUIT (C828)

    2016-02-09 14:15:10164

    This article describes the Wireless Telephone Line Spy CIRCUIT (C828). The content is very simple, very helpful. Components in this article can help yo...

  • Nokia 8587 cell phone

    2016-02-09 13:19:1061

    for data/flash cable only 24 pin cellphone unspecified specialconnector at the mobile phone (keypad DOWN) Pin Signal Description 12,19 Gnd 13 Tx 14 Rx ...

  • Ring detector telephone ringer circuit

    2016-02-09 12:55:3876

    Telephone ringer is an electromagnetic device that actuates a clapper which strikes one or more gongs to produce a ringing sound; used with a telephone...

  • Cellular Phone calling Detector (1N5819)

    2016-02-09 11:34:2169

    Flashes a LED when detecting an incoming call Circuit diagram: Parts: R1____________100K 1/4W ResistorR2______________3K9 1/4W ResistorR3______________...

  • DTMF generators dial tone telephone circuit

    2016-02-09 10:29:08290

    A dial tone (in British English often dialling tone) is a telephony signal used to indicate that the telephone exchange is working, has recognized an o...

  • FM telephone bug.

    2016-02-09 10:17:3963

    Description. Asimple telephone transmitter circuit that is ideal for transmitting the telephone conversation through small distances.The circuit is ver...

  • Soft Musical Telephone Ringer

    2016-02-09 10:03:2762

    Circuit diagram The normal telephone bell, at times (specially during night when one does not want to be disturbed), appears to be quite irritating. Th...

  • A Telephone Scrambler Conversations Circuit

    2016-02-09 09:59:3674

    In telecommunications, a scrambler is a device that transposes or inverts signals or otherwise encodes a message at the transmitter to make the message...

  • Remote Telephone Ringer

    2016-02-09 09:18:3470

    This remote telephone bell ringer allows you to use a large (and loud) external bell in place or in addition to the built in (and rather wussy) ringer ...

  • Dynamic Microphone Preamp Mono by Transister C945 (with PCB)

    2016-02-09 08:55:5087

    This circuit Dynamic Microphone Preamp,Pre MIC 3 Transister mono. By Transister Part C945= 3 part.(TR1-TR3) OR C828 OR C458 Supply Volt 12V 24V. Easy t...

  • How to build PIC Security System Dials Your Cell Phone

    2016-02-09 05:24:5663

    Description Do-it-yourself phone dialer security system calls your cell phone, office etc.whenever a door or window is opened, or panic button is press...

  • Telephone operated remote

    2016-02-09 04:42:2369

    Description. The circuit given below is of a telephone operated DTMF remote. The circuit can be used to switch up to 9 devices using the keys 0 to 9 of...

  • Wireless Ir Headphone Receiver Circuit

    2016-02-09 04:06:1868

    IR detector diode D1 intercepts the IR signal at around 40 kHz and feeds it from Ul, a high-gain preamp, to PLL, U2, a 4046 configured to serve as an F...

  • 1W stereo Headphone Amp (TDA2822)

    2016-02-09 03:50:34104

    A stereo power amp designed for use in portable players and radios. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel....

  • NEC N610 cell phone

    2016-02-09 00:57:4562

    pinout 18 pin NEC N610 cellphone specialconnector at the cell phone Pin Signal Description 5,6 5v ? 3,8 GND 17 Tx 18 Rx Source:www.pinouts.ru Reprinted...

  • Boundary Layer Dish Microphone (MAX232)

    2016-02-09 00:57:3766

    This article describes the Boundary Layer Dish Microphone (MAX232). The content is very simple, very helpful. Components in this article can help you u...

  • Creating A Microphone From A Speaker

    2016-02-09 00:40:3070

    Figure 1 The circuit design utilizes a regular speaker to be converted into a microphone Although it seems strange to think that a loudspeaker can be u...

  • Mobile Phone Travel Charger Circuit Diagram

    2016-02-08 23:15:2796

    Charge Your Mobile Phone While Enjoying The Journey Here is an ideal Mobile charger using 1.5 volt pen cells to charge mobile phone while traveling. It...

  • Low Noise Balanced Microphone Preamp (2N4403)

    2016-02-08 23:06:5085

    This article describes the Low Noise Balanced Microphone Preamp (2N4403). The content is very simple, very helpful. Components in this article can help...

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