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  • How to build Cellular Phone calling Detector

    2016-02-04 09:33:4764

    Flashes a LED when detecting an incoming call Powered by one 1.5V cell Circuit diagram Parts: R1 100K 1/4W ResistorR2 3K9 1/4W ResistorR3 1M 1/4W Resis...

  • Microphone pre amp and Stereophone Drive Circuit Diagram com

    2016-02-04 09:26:0767

    Reprinted Url Of This Article: http://www.seekic.com/circuit_diagram/Audio_Circuit/Microphone_pre_amp_and_Stereophone_Drive_Circuit_Diagram_composed_by...

  • Door Phone Intercom (LM386)

    2016-02-04 08:53:2371

    This article describes the Door Phone Intercom (LM386). The content is very simple, very helpful. Components in this article can help you understand be...

  • Wireless Telephone Line Spy

    2016-02-04 07:38:3965

    This is a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit...

  • Balanced Low Noise Microphone Preamp CIRCUIT (TL071)

    2016-02-04 06:49:53144

    This article describes the Balanced Low Noise Microphone Preamp CIRCUIT (TL071). The content is very simple, very helpful. Components in this article c...

  • Phone Jewelry principle

    2016-02-04 06:43:1765

    Next is the phone jewelry works. The most effective way is to grasp the principle of combining schematic view text, combined with text to understand th...

  • Wireless Microphone

    2016-02-04 06:24:1865

    Ql amplifies the output from an electret microphone MIC1. Audio is fed into oscillator Q2, which modulates the signal. LI CI is a tank circuit for oper...

  • Long range directional microphones-myth and reality

    2016-02-04 05:42:2193

    There are a lot of myths about directed long range microphones. You can here like they can reach distances of 100, 200 and more meters, other say that ...

  • Cell Phone Jammer Circuit Diagram

    2016-02-04 05:18:2979

    This is a mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobile phone network...

  • XR-T8205 and SL2411 telephone tone ringer circuit

    2016-02-04 04:29:2481

    A compact tone ringer with audio visual indicator is for internal or protected use in noisy ambient conditions in residential, commercial and industria...

  • Panasonic GD55 cell phone

    2016-02-04 04:05:0965

    full pinout 3 pin Panasonic GD 55 cellphone specialconnector at the mobile phone Pin Signal Description 1 Rx 2 Gnd 3 Tx Source:www.pinouts.ru Reprinted...

  • Cut telephone line detector CIRCUIT (CA3140)

    2016-02-04 04:02:1273

    This article describes the Cut telephone line detector CIRCUIT (CA3140). The content is very simple, very helpful. Components in this article can help ...

  • Balanced Low Noise Microphone Preamp (2N4403)

    2016-02-04 03:25:4572

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

  • TCA3388 telephone line interface circuit

    2016-02-04 03:05:57106

    The TCA3388 is a telephone line interface circuit which performs the basic functions of a telephone set in combination with a microcontroller and a rin...

  • Telephone Party intercom circuit

    2016-02-04 02:10:2992

    The circuit to make two phones work as an intercom is extremely simple. You can see in the picture below, all you really need is a little bit of spare ...

  • Pantech cell phones

    2016-02-04 01:08:0362

    G500 and others 24 pin Pantech cellphone specialconnector at the mobile phone, looking into cable-side connector 1(24) Vcharge 2(23) Vcharge 3(22)* CTS...

  • How Condenser Microphone Works

    2016-02-04 00:11:4662

    A condenser microphone is different from dynamic microphone. The condenser microphone, the diaphragm is assembled close to a rigid backplate. This micr...

  • USB Cellphone Charger circuit

    2016-02-03 23:19:5969

    Now you can charge your Mobile Phone from the USB outlet of PC. This simple usb cellphone charger circuit can give regulated 4.7 volts for charging the...

  • Automatically Telephone Call Record Circuit

    2016-02-03 20:53:4192

    This circuit is used to record the calls automatically. A idle tape recorder at home connected with the telephone to record the phone calls automatical...

  • Computer Microphone (BC413B)

    2016-02-03 20:51:1365

    This article describes a Computer Microphone (BC413B). The content is very simple, very helpful. Components in this article can help you understand bet...

  • Cellular Phone Calling Detector Circuit (1N5819)

    2016-02-03 20:32:51173

    This article describes Cellular Phone Calling Detector Circuit (1N5819). The principle is very simple, very practical. The circuit components can help ...

  • Automatic telephone conversations recording circuit

    2016-02-03 19:50:5093

    Sometimes it is useful to record telephone conversations. The easiest way is to go to a shop and buy a telephone conversation recording adapter which i...

  • OP37 low noise microphone preamp circuit design

    2016-02-03 19:39:2469

    Audio Circuits This microphone preamp schematic electronic circuit project is designed using the OP37 operational amplifier manufactured by Analog Devi...

  • Universal mobile phone battery charger circuit (BQ2057)

    2016-02-03 19:01:54124

    Universal mobile phone battery charger circuit (BQ2057) The 2N5401 is designed as a general purpose amplifier and switch for applications requiring hig...

  • Telephone number display principle

    2016-02-03 18:25:5975

    This article describes the principle of the telephone number is displayed. In order to better grasp the principle of combining text, please understand ...

  • How to build The Original 2 Phone Link Design (NE556)

    2016-02-03 18:25:2566

    This article describes the How to build The Original 2 Phone Link Design (NE556). The content is very simple, very helpful. Components in this article ...

  • Telephone Hold Button electronic circuit diagram

    2016-02-03 16:29:0565

    Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will f...

  • A Friendly Charger Schematic for Mobile Phones(CA3130)

    2016-02-03 15:41:40134

    This article describes the A Friendly Charger Schematic for Mobile Phones (CA3130). The principle is very simple, very practical. The circuit component...

  • Samsung E720, E810, P730 cell phones interface port

    2016-02-03 14:17:5062

    may be connected to the computer USB port 24 pin Samsung cellphone specialconnector at the mobile phone pinout suggested for E720 Pin Signal Descriptio...

  • Analog Signal Transmission Over Telephone Lines (TC9400)

    2016-02-03 13:40:1870

    This article describes the Analog Signal Transmission Over Telephone Lines (TC9400). The content is very simple, very helpful. Components in this artic...

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