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Citizens' Band radio
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Electrician's reference book
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Free online library on electronics Useful articles and background materials:
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Big encyclopedia for children and adults
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Life of great physicists
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Free online library on electronics Free magazines:
A Radio. Prakticka Elektronika magazine
Amaterske Radio magazine
Circuit Cellar magazine
Electronique et Loisirs magazine
Electronique Pratique magazine
Elektor Electronics magazine
Elektronika dla Wszystkich magazine
Elektronika Praktyczna magazine
Everyday Practical Electronics magazine
Evil Genius magazine
Funkamateur magazine
Nuts And Volts magazine
QEX magazine
QST magazine
Radiotechnika Evkonyve magazine
Servo magazine
Stereophile magazine
Радио Телевизия Електроника magazine

Free online library on electronics Free audio, video, tvs schematic diagrams and service manuals:
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Beko TVs
Elenberg, Cameron, Cortland domestic radio electronics
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Gorizont TVs
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Rubin TVs
Vestel TVs
Vitjaz TVs

Power supply units for TV sets and video equipment

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LG mobiles
Maxon mobiles
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Sharp mobiles
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Voxtel mobiles

Free online library on electronics Free household appliances schematic diagrams and service manuals:
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Braun household appliances
Candy household appliances
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Elica household appliances
Gorenje household appliances
Hansa household appliances
Merloni household appliances
SEB household appliances
Snaige household appliances
Stinol household appliances
Universal household appliances
Whirpool household appliances

Free online library on electronics Free electric tools schematic diagrams and service manuals:
Bocsh electric tools
Makita electric tools

Free online library on electronics Free electric tools schematic diagrams and service manuals:
Bocsh electric tools
Makita electric tools

Free online library on electronics Free reference books:
Collection of dumps
Correspondence of models and chassis
Horizontal-output transformers by HR company
Horizontal-output transformers by Konig company
Integrated circuits, microcontrollers and transistors
Mechanisms of audio and video equipment
Radio components by Atmel
Radio components by Cirrus Logic
Radio components by Maxim
Radio components by Microchip
Radio components by Mitsubishi
Radio components by Motorola
Radio components by National Semiconductor
Radio components by Panasonic
Radio components by Philips
Radio components by Rohm
Radio components by Samsung
Radio components by Sharp
Radio components by Sony
Radio components by Toshiba
Remote controls for TV sets and monoblocks

News of science and technology




Order of schematic diagrams and service manuals Order of diagrams

Schematic diagrams to order:
World air conditioners
World audio
World car audio
World DVDs
World faxes
World fridges
World microwave ovens
World monitors
World monoblocks
World phones
World photo cameras
World projectors
World TVs
World video cameras
World video recorders
World washing machines

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Assembling the Rubik's Cube
Did you know?
Entertaining experiments at home
Funny puzzles
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Optical illusions
Spectacular tricks and their solutions


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Free online library on electronics

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Free online library on electronics Free online library on electronics, Free encyclopedia of electronics and electrical engineering

All articles of the Free encyclopedia of electronics and electrical engineering are listed in alphabetical order. For automatic translation of articles into your native language, please use Translate it! form in the top left corner of the page.



Telephony. Articles with illustrations and detailed explanations:

1x5 Telephone Microprocessor Switch

A device for checking telephone sets

A simple adapter for recording a conversation from a telephone line

A simple device for checking phones

A simple indicator of a busy telephone line

Adaptation of imported phones

Adapter for AVU

Against telephone pirates

Amateur radio telephone RTF-92

Amplifier for a modem

Amplifier for Phone

Amplifier to the Spectrum

Amplifier to the telephone

And again about paired telephones

Another Phone Watchdog

Another telephone Amplifier

Another version of the antenna for a cell phone

Answering machine in telephone sets with CLI

Answering machine reporting time


Automatic recording of a telephone conversation

Backup power for a phone with CLI

Bug. Micro Power Radio Transmitter

Busy phone line indicator

Caller ID device

Calling a Parallel Phone

Calling device for hubs

CLI based on the Panasonic KX-T2365 phone

CLI based on the PANASONIC KX-T2365 telephone

CLI console to computer Electronic Secretary

CLI power source

CLI working principle

CLI-Z80 Interface

Completion of the telephone

Connecting the sound card to the phone

Connecting the sound card to the telephone line

Conversation node for a telephone set

Cordless phones and all about them

Design and repair of the power supply unit of the PANASONIC KX-F50 fax machine

Device for automatic reset of the processor in CLI

Dialer IC Protection

Diode Disconnect Prefix for Phone

DTMF standard number identifier

Electronic call for a telephone on a chip

Electronic Pulse Corrector

Electronic Secretary

External antenna for a GSM cell phone

External antennas of cell phones

Fax machine - printer and scanner

Finalizing the CLI on the Z80

FSK standard number determinant

Generator of the musical phrase on integral timers

Hours of telephone conversations

How to connect several devices via RS-232 interface

How to connect the ADSL splitter correctly

How to replace an imported microcircuit in a telephone set

Indicator of listening to a conversation on a parallel phone

Indicator of telephone calls

Indicator of telephone calls

Indicator of the busy telephone line

Indicators for a paired phone

Intercity Censor

Intercity Code Exit


Intercom - hands-free communication console

Intercom Director-Secretary

Intercom from old phones

Intercom on LM386 chip

Intercom via 220 V network

Intercom with automatic call

Intercom with time division channels

Interlock with light indication

ISDN Network

Light instead of a call

Light Phone

Line Hold Prefix

Load Management with CLI

Method for connecting a parallel telephone

Miniature radio telephone

Mobile Features

Modem and Phone Protection

Multi-functional telephone master device Berkut

Music Phone Call

Narrowband filter detector

Negotiating machine

Optical fiber lines and communication

Optical telephone

Organization of access to the networks of satellite operators

Outgoing Call Registration and Charging System

Owners of paired phones

Parallel Phone Interlock (1)

Parallel Phone Interlock (2)

Parallel Phone Lock

Parallel telephone lock on thyristors

PBX is a prefix to the computer

Phone Call Timer

Phone Message Auto-Record Adapter

Pirate phone locker

Power switch with remote control

Prefix for recording telephone conversations (1)

Prefix for recording telephone conversations (2)

Prefix selector for phone

Prefix to telephone for paired lines

Prefix with CLI for radiotelephone and mini PBX

Protection against telephone pirates

Protection of imported telephones

Protection of the telephone

Pulse Stabilizer for a Telephone

Pulse Stabilizer of a Capacitor Power Supply

Radio connection of two faxes

Radiotelephone from a radio station

Radiotelephone from a telephone tube

Receiver-decoder of DTMF signals

Refinement of imported telephones

Refinement of the calling device for phones

Repair imported phone-tube

Repair mobile phone charger

Repair of cordless phones

Repair of imported telephones

Replacing the carbon microphone

Replacing the carbon microphone in your phone

Restoration of the battery of cordless telephones

Schematic diagram of the Ukrtelecomov device

Second call for a phone

Simple Intercom System

Simple Phone

Simple telephone dialing lock

Small intercom

So is it possible to protect the CLI from crashes?


Speech coding in digital cellular systems

Telemechanics for switching loads by phone

Telephone adapters for auto-recording information

Telephone Amplifier with inductive sensor

Telephone Answering System

Telephone Dialing

Telephone informer

Telephone Interface (1)

Telephone Interface (2)

Telephone interface for a CBS radio station

Telephone Line Controller

Telephone Line Hold Device

Telephone Line Protection

Telephone Line Splitter

The infrared light phone

The principle of telephone cards

The radiotelephone interface for simplex radio stations

The telephone operator

Three options for homemade Anti-CLI

Three phone locks

Three prefixes to telephone sets

Time counter for outgoing telephone conversations

Time counter for telephone conversations

Turning an external device on and off using a modem

TV aerial for a cell phone

Two options for muting the microphone

Two-tone Multi-Frequency (DTMF) AVR Generator

Two-way communication

Using an optocoupler in a telephone call device

VHF Microtransmitter to the telephone


We repair the CLI on our own

What is a DECT

Work of one phone with CLI on parallel lines