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  • Telephone Tapping Indicator

    2016-02-16 22:31:3578

    This simple circuit can indicate a misuse or tapping of Telephone line through a loud alarm. The circuit is too simple and can be easily assembled on a...

  • FM transmitter microphone

    2016-02-16 21:53:10109

    An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D...

  • Nokia 7710 cell phone internal

    2016-02-16 21:31:5274

    pinout 9 pin Nokia 7600 cellphone specialconnector at the mobile phone Pin Signal Description 3,7 Gnd 4 MBUS 5 Vpp 8 F-Bus Rx 9 F-Bus Tx A Vbat B BSI C...

  • FM telephone line bug transmitter CIRCUIT (BC109)

    2016-02-16 20:57:3373

    This article describes the FM telephone line bug transmitter CIRCUIT (BC109). The content is very simple, very helpful. Components in this article can ...

  • Off-Hook Telephone Line Indicator

    2016-02-16 20:43:0372

    Figure 1 The circuit is designed to connect in parallel with the telephone line, to monitor and detect if any telephone in the same line is busy, with ...

  • Nokia 3320, 3220, 7260, 3360, 3560 TDMA cell phones interna

    2016-02-16 20:16:0677

    full pinout 5 pin Nokia semi-round cellphone specialconnector at the cellular phone Pin Signal Description 1 GND 2 MBUS 3 Vpp 4 Rx 5 Tx For Nokia 3220,...

  • Phone Busy Indicator electronic circuit diagram

    2016-02-16 20:03:3671

    Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection? Well, this simple circuit should put an end to ...

  • Headphones with Noise-Canceling Feature

    2016-02-16 19:58:0773

    Figure 1 The project produces noise-canceling headphones which allow the background noise to be minimized while listening to music. To keep the microph...

  • Cellular phone detector circuit schematic

    2016-02-16 19:14:3891

    Radio Circuits Using this electronic schematic , can be designed a very simple cellular phone detector circuit which can sense the presence of an activ...

  • NEC 606, 808 cell phones

    2016-02-16 19:08:5961

    10 pin cellphone specialconnector at the mobile phone Pin Signal Description 8 Tx 9 Rx 10 GND Source:www.pinouts.ru Reprinted Url Of This Article: http...

  • Telephone line simulator CIRCUIT (BC549)

    2016-02-16 19:08:5093

    This article describes the Telephone line simulator CIRCUIT (BC549). The content is very simple, very helpful. Components in this article can help you ...

  • Preamp for Speaker as a Microphone

    2016-02-16 18:42:03105

    This Microphone Preamp circuit shows that it is possible to use the speaker as a microphone, and is specifically designed to beginners because of its s...

  • Circuit Diagram of Cordless Phone Battery Backup(LM317L)

    2016-02-16 18:27:1164

    This article describes the Circuit Diagram of Cordless Phone Battery Backup (LM317L). The principle is very simple, very practical. The circuit compone...

  • Sony CMD C1 cell phones

    2016-02-16 17:42:1663

    for data/flash cable only 5 pin cellphone specialconnector at the cellular phone (keypad up) Pin Signal Description 2 GND 4 Tx 5 Rx Source:www.pinouts....

  • Phone Busy Indicator (BC148)

    2016-02-16 17:15:0471

    This article describes the Phone Busy Indicator (BC148). The content is very simple, very helpful. Components in this article can help you understand b...

  • Door Phone

    2016-02-16 16:52:4380

    LM 386 is just right for a door phone application. It is very useful application in the present urban households. One condenser microphone and a speake...

  • A Smartphone Dock Built Inside Man

    2016-02-16 15:57:1063

    Prosthetic Arm with Smartphone Trevor Prideaux, a fifty year old man from United Kingdom was born without his left forearm. Years later he was given a ...

  • Panasonic GD35 cell phone

    2016-02-16 15:27:3564

    for data/flash cable only 7 pin Panasonic cellphone specialconnector at the cellular phone Pin Signal Description 3 Rx 4 Tx 5 GND 5,6,7 batt pins Sourc...

  • Cut Phone Line Detector

    2016-02-16 15:14:3564

    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 ...

  • Infrared headphones receiver circuit

    2016-02-16 14:31:1169

    Use this infrared headphones receiver with the ir headphones transmitter. Use 600Ω headphones. BPW41N and BP104 have a filter for visible light and ar...

  • 3 channel microphone mixer circuit with IC741

    2016-02-16 14:06:5870

    Mic mixer circuit Welcome back to Free circuit dot com again,today we have still audio circuit for your build . The circuit is a basic 3 input mic mixe...

  • Ac Signal Telephone Tone Ringer Circuit

    2016-02-16 13:07:3381

    The MC34017Tone Ringer derives its power supply by rectifying the ac ringing signal. It uses this power to activate a tone generator and drive a piezoc...

  • Sharp GX1, GX10, GX10i, GX20, GX21, GX22 cell phones

    2016-02-16 12:49:5362

    for data/flash cable only 16 pin Sharp GX10 cellphone specialconnector at the cellular phone (keypad up) Pin Signal Description 1,9,14 GND 2 link to 10...

  • Phone ring circuit schematic (BC848)

    2016-02-16 12:05:5882

    This article describes the Phone ring circuit schematic (BC848). The content is very simple, very helpful. Components in this article can help you unde...

  • FM Wireless Microphone(MAX4467)

    2016-02-16 11:42:4270

    This article describes FM Wireless Microphone (MAX4467). The principle is very simple, very practical. The circuit components can help you understand b...

  • Spy Telephone circuit Schematic

    2016-02-16 11:09:0267

    ThisFM spy telephone circuitis mounted serrial with the phone line. When is signal on the wires thistransmitterwill radiate airwaves thru the wires wic...

  • Doorphone intercom (LM386)

    2016-02-16 10:58:0370

    This article describes the Doorphone intercom (LM386). The content is very simple, very helpful. Components in this article can help you understand bet...

  • Nokia N-Gage QD cell phones internal

    2016-02-16 08:37:4261

    for data/flash cable only 5 pin cellphone specialconnector at the mobile phone (batt pins are up) Pin Signal Description 1 Gnd 2 Rx 3 MBUS 4 Tx 5 Vpp S...

  • Samsung S100, S105 cell phones

    2016-02-16 08:22:5861

    for data/flash cable only 23 pin Samsung S100 cellphone specialconnector at the cellular phone Pin Signal Description 16 Data out 15 Data in 18,20,22 G...

  • Mobile Phone Portable Charger Circuit Diagram

    2016-02-16 07:13:2595

    Do you worry that charging the mobile phone when you want to travel,Mobile Phone Travel Charger can help you. This is an cell phone travel charger util...

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