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...
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...
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...
This article describes the FM telephone line bug transmitter CIRCUIT (BC109). The content is very simple, very helpful. Components in this article can ...
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 ...
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,...
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 ...
Figure 1 The project produces noise-canceling headphones which allow the background noise to be minimized while listening to music. To keep the microph...
Radio Circuits Using this electronic schematic , can be designed a very simple cellular phone detector circuit which can sense the presence of an activ...
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...
This article describes the Telephone line simulator CIRCUIT (BC549). The content is very simple, very helpful. Components in this article can help you ...
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...
This article describes the Circuit Diagram of Cordless Phone Battery Backup (LM317L). The principle is very simple, very practical. The circuit compone...
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....
This article describes the Phone Busy Indicator (BC148). The content is very simple, very helpful. Components in this article can help you understand b...
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...
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 ...
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...
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 ...
Use this infrared headphones receiver with the ir headphones transmitter. Use 600Ω headphones. BPW41N and BP104 have a filter for visible light and ar...
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...
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...
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...
This article describes the Phone ring circuit schematic (BC848). The content is very simple, very helpful. Components in this article can help you unde...
This article describes FM Wireless Microphone (MAX4467). The principle is very simple, very practical. The circuit components can help you understand b...
ThisFM spy telephone circuitis mounted serrial with the phone line. When is signal on the wires thistransmitterwill radiate airwaves thru the wires wic...
This article describes the Doorphone intercom (LM386). The content is very simple, very helpful. Components in this article can help you understand bet...
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...
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...
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...
- Phone ring circuit schematic (BC848)
- Nokia 6170 cell phone internal
- FM Telephone Bug CIRCUIT (BC107)
- Nokia 3310, 3315, 3330, 3350, 3390, 3410, 5510 cell phones
- Ring detector telephone ringer circuit
- Mobile Phone Travel Charger Circuit Diagram
- Soft Musical Telephone Ringer
- Doorphone intercom (LM386)
- Soft musical telephone ringer CIRCUIT (1N5819)
- Mobile Phone and iPod Battery Charger(MC34063A)
- Protection For Telephone Line(V250LA4)
- Cut telephone line detector CIRCUIT (LM311N)
- Pulse dialing system for interfacing telephone circuit
- Long range directional microphones-myth and reality
- Siemens S10 S11 S1088 cell phones
- Electret Microphone Pre-amp based NE5532
- Parallel Phone Tap Circuit Diagram
- How to build Phone Busy Indicator (2N3392)
- Telephone privacy adapter
- Nokia 5100, 5100a cell phones internal
- Doorphone Intercom by IC LM386
- Telephone Ringer Using Timer ICs(NE556)
- FM Telephone Bug circuit (1N4001)
- Cellular Phone calling Detector CIRCUIT (D438)
- Hop-On 1800 $10 GSM Cell Phone ??? Would You Mind to Buy One
- Sony CMD 1000 cell phone
- Hearing impaired visual ring indication telephone
- Telephone Hold Button Circuit
- Telephone Tone Ringer Chip Circuit
- Telephone Tapping Indicator(BC547)
- Telephone Guard circuit
- Ring Indicator of Telephone Line Circuit by LM555
- Solar Based Mobile Phone Charger Circuit
- Phone Busy Indicator
- Telephone line vigilance principle
- Nokia 9500 cell phone internal
- Nokia 3300 cell phones internal
- Nokia 6800, 6810 cell phones internal
- Stereo Mixer for Microphone with 2 Channels
- Mobile Phone Battery Charger
- Computer Microphone (BC413B)
- Door Phone Intercom (LM386)
- Computer Microphone by BC547
- Automatically Telephone Call Record Circuit
- Wireless infrared headphone transmitter
- An infrared head phones display
- How Dynamic Microphone Works
- Wireless Telephone Line Spy CIRCUIT (C828)
- Telephone off-hook indicator
- CMOS RAM poewed repertory dialer phone circuit
- Single Transistor Wireless Microphone (FM Transmitter)
- Sony CMD CD5, Z5, Z18 cell phones
- USB Cellphone Charger circuit
- Telephone operated remote
- Mobile Phone Portable Charger Circuit For Traveling
- Ac Ringing Voltage Extension Phone Ringer
- Remote telephone line extension bell ringer circuit
- Telephone Bell Simulator Circuit
- Telephone Recorder
- Cellular Phone Calling Detector electronic circuit diagram
- Telephone Party intercom circuit
- Panasonic G60, X100, X500 cell phone
- Mobile Phone Travel Charger (BC548)
- Phone Incoming Call Flasher
- Watch-Dog For Telephones(NE555)
- Remote Telephone Ringer
- Dynamic Microphone Preamp Mono by Transister C945 (with PCB)
- Telephone Ringer
- Nokia 9000, 9000i Communicator cell phones
- Cassette automatically telephone recording circuit
- How to build A Friendly Charger Schematic for Mobile Phones
- How to build Telephone Ringer
- Nokia Cell Phone circuit diagram
- Two Transistors Wireless Microphone FM Transmitter Circuit S
- Nokia 8887 cell phone
- Solar cell phone charger
- MS Stereo Microphone (LM5532)
- Cellular Phone calling Detector (1N5819)
- HowTo: Make a LoFi Mic from an Old Telephone
- Samsung SPH-I330 cell phone
- Phone Busy Indicator (BC148)
- Cordless Phone Backup principle
- Loud ringer for phone (KA2411)
- Panasonic GD55 cell phone
- Cellphone Charger Using Bike Battery
- Nokia 16xx, 3110, 8110 cell phones
- Universal mobile phone battery charger circuit (BQ2057)
- Nokia 7610 cell phone internal
- Telephone Spy Conversation Recording Circuit
- Telephone in use indicator.
- Samsung z105 cell phone
- Ericsson phone to PC serial port interface CIRCUIT (RS232)
- FM transmitter microphone
- Mobile Phone Universal Charger Electronic Circuit Diagram An
- Intercom System with Telephone-Based Door Entry
- NEC N610 cell phone
- Sagem My-C2 cell phones
- Cell-Phone calling Actuator (TS555CN)
- FM telephone bug.
- Wireless Headphone Circuit Diagram