Russian: Russian version English: English version
Translate it!
Search the Site

+ Search the Archive of technical magazine articles free 10,000 articles!
+ Search the Catalogue
+ Search the Data sheets Archive
+ Search the chassis and models Archive

Free online library on electronics Free library:
Encyclopedia of electronics and electrical engineering
Books and magazines
Schematic diagrams and service manuals
Reference books
News of science and technology

Free online library on electronics Free encyclopedia of electronics and electrical engineering:
Alternative energy sources
Assemblies of amateur radio equipment
Audio equipment
Audio-fidelity and speaker volume controls
Ballasts of fluorescent lamps
Bells and audio simulators
Chargers, accumulators, galvanic cells
Citizens' Band radio
Clocks, timers, relays, load commutators
Consumer electronics
Current controllers, voltage and power regulators
Data communication
Digital equipment
Electric installation work
Electric meters
Electric motors
Electric power supply
Electrical safety, fire safety
Electrician's reference book
Electrician's tools
Electricity for beginners
Equipment protection from emergency operation, uninterrupted power supply units
Field intensity detectors
Fluorescent lamps
For a musician
For an electrician
For an inexperienced radio amateur
For radio amateur constructors
For students
Frequency synthesizers
Grounding and neutral grounding
Halogen lamps
High-frequency power amplifiers
Home, garden, farmland, hobbies
Household appliances
Indicators, detecting devices, metal detectors
Infra-red equipment
Lightning protection
Measuring equipment
Microphones, wireless microphones
Mobile communication
Portable radio stations
Power amplifiers
Power controllers, thermometers, thermostabilizers
Power supply units
QRP equipment
Radiation indicators
Radio amateur computation
Radio amateur technologies
Radio control
Radio reception
Radio stations, transceivers
Reference materials
Security and alarm system using mobile communication
Security devices and alarm systems
Sound systems
Sound-to-light units
Upgrade of radio stations
Use of microcircuit chips
Various electronic devices
Voltage stabilizers
Voltage transducers, rectifiers, inverters
Welding equipment

Free online library on electronics Useful articles and background materials:
Art of audio
Art of video
Batteries and rechargeable batteries
Big encyclopedia for children and adults
Biographies of great scientists
Children's scientific lab
Entertaining experiments in chemistry
Entertaining experiments in physics
For builders and handymans
For lovers of travel. Tips for tourists
Fundamentals of health and safety
Fundamentals of medical first aid
History of engineering, technology, objects around us
Home workshop
Industrial technology at home - simple recipes
Labor protection
Lecture notes, cheat sheets
Life of great physicists
Miracles of nature. A fascinating journey around the globe
Spectacular tricks and their solutions
Personal transport: land, water, air
Riddles, puzzles, trick questions
Scale modeling
The most important scientific discoveries
Tools and mechanisms for agriculture
Typical labor protection instructions (Job descriptions)
Visual illusions

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:
Popular audio
Popular car audio
Popular DVDs
Popular faxes
Popular monitors
Popular monoblocks
Popular phones
Popular TVs
Popular video cameras
Popular video recorders and video players

Avest TVs
Beko TVs
Elenberg, Cameron, Cortland domestic radio electronics
Erisson TVs
Gorizont TVs
Rainford TVs
Rekord TVs
Roadstar TVs
Rolsen TVs
Rubin TVs
Vestel TVs
Vitjaz TVs

Power supply units for TV sets and video equipment

Free online library on electronics Free mobiles schematic diagrams and service manuals:
Benq-Siemens mobiles
Eastcom mobiles
Ericsson mobiles
Fly Bird mobiles
LG mobiles
Maxon mobiles
Mitsubishi mobiles
Motorola mobiles
Nokia mobiles
Panasonic mobiles
Pantech mobiles
Samsung mobiles
Sharp mobiles
Siemens mobiles
Sony-Ericsson mobiles
TCL mobiles
Voxtel mobiles

Free online library on electronics Free household appliances schematic diagrams and service manuals:
Beko household appliances
Braun household appliances
Candy household appliances
Elenberg household appliances
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

Have fun! Have fun!
Assembling the Rubik's Cube
Did you know?
Entertaining experiments at home
Funny puzzles
Interactive flash games
Optical illusions
Spectacular tricks and their solutions

© 2000-2021

Design and support:
Alexander Kuznetsov

Technical maintenance:
Mishell Bulah

Daniel Monchukin

Tatyana Anastasyeva

Natalya Kuznetsova

Contact us

When using materials of the website, link to https://www.diagram.com.ua is a must

created in Ukraine
created in Ukraine

Free online library on electronics

Search the Site

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.

For an inexperienced radio amateur

For an inexperienced radio amateur

For an inexperienced radio amateur. Articles with illustrations and detailed explanations:

160-meter antennas

1-stage audio frequency Amplifier (1)

A beginner radio amateur. Detector radio

A beginner radio amateur. First construction

A beginner radio amateur. Radio

A beginner radio amateur. Theory

A beginner radio amateur. Tools

A biophysometer for diagnosing a personís functional state

A brief glossary of technical terms

A little about circuit boards

A method for measuring the saturation current of an inductor core, transformer or choke

A sampler generator - Amplifier

A simple Amplifier for a receiver with free energy

A simple generator for learning the telegraph alphabet

A simple photo relay

A simple signal generator

A simple way to check the thyristors

About oscillations and waves

About power, W, decibels. Explanation of Terms

About the binary system and codes

Accompany light

Acoustic Relay

Acoustic sensor for Christmas tree lights

Active probe to the oscilloscope


AL307 highlights the scale

Alarms on the flashing LED

Amateur radio call signs

Amateur ranges

Amplitude, average, effective

Animated pictures on the LED matrix

Antenna and grounding

Audible alarm on dynistor

Audio Frequency Generator (1)

Audio Frequency Generator (2)

Audio frequency with telegraph filter


Automatic fan switch

Automatic for the formation of light effects

Automatic Light Switch

Automatic shooting range from a DENDY pistol

Automatic switch LED

Automatic switching of LED garlands

Automatic switch-on incandescent lamps

Automatic Telegraph Key

Auto-reversing running lights

Avometer - the first measuring device

Baretter and urdox

Basic parameters of transmitters and receivers

Beacon light for pets

Bicycle Power Plant

Bugs, transmitters and receivers: basic terms

Calculation of AC circuits

Calculation of Amplifiers with feedback

Calculation of complex and branched chains

Calculation of inductors

Calculation of LC-filters

Calculation of nonlinear circuits

Calculation of power supplies

Calculation of RC-filters

Calculation of transistor Amplifiers

Calculation of tube Amplifiers

Calibration of wavemeters for short waves

Call signs of Russian radio stations

Canary trill simulator

Capacitors and applications

Children's electric car with pulse-width motor control

Chinese watches - timer

Christmas tree lights with flashing LEDs

Circuit Designations

CMOS chip generators

Code Converter (encoders, multiplexers, etc.)

Code Lock

Combined radio

Compact Oscilloscope Probe

Conditional graphic and letter designations of radio radio elements

Conversions between number systems - easy and with a smile


Counters and frequency dividers

Crossing Game

Crystal Amplifier to the detector receiver

Daltometer for determining the response time to light stimuli

DC Amplifier

Design of the receiver

Designs based on a computer mouse

Detector and Detection

Development board for chips

Device Eternal alarm

Devices on Logic Elements

Digital Audio Amplifier

Digital ICs. Types of logic, body

Digital Integrated Circuit

Dimensional lights of aliens


Direct Gain Radio (1)

Direct Gain Radio (2)


Do you believe the game - do you not believe?


Dual-frequency generator with flashing LED

Dynamic Indication

Electric motor - with your own hands

Electronic bicycle call

Electronic Bone

Electronic Call

Electronic clock without ... electronics

Electronic cube (1)

Electronic cube (2)

Electronic Drum

Electronic flasher

Electronic fuse, 5-25 V

Electronic Game Store (1)

Electronic Game Store (2)

Electronic judge for the game Who is faster?

Electronic Level Gauge

Electronic Stick - High Vage Converter

Electronic Swing

Electronic switch

Electronic switch on field-effect transistors

Electroscope with sign indication

Entertaining experiments: a dynamic head - a toy dance floor

Entertaining experiments: a family of thyristors

Entertaining experiments: familiar with the diode

Entertaining experiments: some possibilities of a field-effect transistor

Entertaining experiments: some transistor professions

Evaluation of the thickness of the paint coating

Field Indicator

First computers

First Radio

Flashing light - direction indicator

Flashlight Pen

Fortune slot machine

Four-way traffic lights

Fractional Quantum Hall Effect

Framework - from ballpoint pen

Fundamentals of Boolean Algebra

Gaming machine Reaction

Garland fault seeker with indicator light

Garland Fault Seeker with Sound Indicator

Garland on the flashing LEDs

Garland with a smooth change in brightness

Generators and pulse shapers

Geotronics: electronics in geodesy


Hidden wiring seeker based on a digital multimeter

High Frequency Generators

High Power Timer

High-current electronic key with touch controls

History of metal detectors

Home exercise bike

Homemade electric burner

Homemade iron

How the TV (sweep) works

How to check a triac

How to check the triristor and triac

How to determine the base of the bipolar transistor

How to present information in digital devices?

How to read your receiver's circuit

Humidity is controlled by the cellular phone

Improved indicator of the coming year

Improvement of the parametric Vage regulator

Indicator of hidden wiring

Indicators on neon lamps

Infrared Indicator

Instead of a switch - a carnation

Intercom (1)

Intercom (2)

Intercom for two subscribers

Introduction to digital electronics

Is everything a detector?


Jukebox for the New Year Tree

Key to the transistor footprint

Laboratory Instrument for Auto-Training Sessions

Laser light phone

Laser phone based on a laser pointer

Laser shooting gallery

Laser telephone

Learn the telegraph alphabet

LED beacon

LED beacons

LED Dimmable Nightlight

LED indicator in the switch

LED line of running lights

LED Night Light

LED probe p-n transitions

LED Running Lights

LED string switch

LED Vage indicator

LEDs and their application

Lekherov line

Let's get acquainted with ... SW

Let's talk about number systems

Light controls the model

Light effects automatons with randomly turning on lamps

Light pulse generators

Linear Ohmmeter

Logic elements and their electrical counterparts

Logic Elements and Truth Tables

Logic elements from the inside

Logic elements outside

Loud radio reception

Low Vage Power Vage Indicator

Luminous disk

Magnetostriction effect

Manipulation without clicks

Measuring mini-laboratory

Melodious call

Memory simulator

Metal Detector

Metal Object Indicator


Mine Detector

Mini color music

Miniature radio

Mini-probe on discrete elements

Model of the traffic light


Moisture indicator

Multivibrator - flasher (1)

Multivibrator - flasher (2)

Multivibrator on field-effect transistors

Musical Garlands

Musical play of light

Musical Toy Svetofon

Network enable indicator on a two-color LED

New features of chip Vage stabilizers

New laser pointer professions

New Year's Eve

Novice programmers of PIC microcontrollers

One-stage audio frequency Amplifier (2)


Oscillating circuit

Overcurrent warning device (1)

Overcurrent warning device (2)

Overheating indicator

Owl eyes

Period and frequency of oscillations

Photoelectronic alarm

Phototir based on a laser pointer

Phototir from a laser pointer

Physics of aeroionization

Possible faults

Power supply for any design

Powered by a flashlight

Practical acquaintance with a digital chip

Practical use of operational Amplifiers. Part 1

Practical use of operational Amplifiers. Part 2

Practical use of operational Amplifiers. Part 3

Prefix - capacity meter

Prefix Color sound

Prefix for testing transistors

Prefix to the multimeter for temperature measurement

Prefix to the soldering iron

Prefixes of World Territories

Probe based on a miniature relay (1)

Probe based on a miniature relay (2)

Probe for montage dialing (1)

Probe for montage dialing (2)

Probe for mounting verification

Probe for testing oxide capacitors

Probe generator for testing radio equipment

Pseudo-printed montage

Pulse Extenders

Pulse generators (multivibrators, autogenerators)

Push-Pull Audio Power Amplifier (1)

Push-pull audio power Amplifier (2)

Radio Game Find a mine

Radio receiving antennas

Radio Reception

Radio Uninterruptible Power Supply

Radio Wave Distribution

Radio waves. Radio wave ranges

Radio with a candle flame detector

Radio with field-effect transistors

Radio with power from a ... multimeter

Receive SW to the detector

Receiver for walking

Rectifiers. How and why?

Red or green? (game)

Refinement of network adapters

Refinement of the НРА24АХ sound emitter

Reflex Radio

Reflex radio for local reception


Relay Control Under Undervoltage

Repairing New Year's Garland

Resistors and their application

Resonant Volometer

Retro: on a field-effect transistor


Running fire with 10 LEDs

Schmitt Trigger (1)

Schmitt Trigger (2)

Security Device

Self-made detectors

Self-oscillating multi-vibrator

Semiconductor archeology, or Tribute to an unknown predecessor

Short pulse generator

Short waves in wires

Signal Amplifier

Signal disconnect network Vage

Signal Generator

Signal Referee

Simple Frequency

Simple power supply

Simple probes, consoles, meters

Simple telephone

Simple transistor test

Simplest Sensor

Simplest variable capacitor

Simulator of drip sounds

Simulator of firing sounds

Simulator of meow sounds

Simulator of the sound of a jumping ball

Siren (1)

Siren (2)

Siren from Aurora sounder

Slot machine on RS-triggers

Small-sized searcher for hidden wiring

Sniper simulator based on a laser pointer

Soldering for beginners

SOS device

Sound indicator

Sound Keyring

Sound Watchman - tone generator

Soundtrack on a radio channel

Speaker power indicators

Species of the same scheme (single-ended multivibrator)

Standby Multi-Vibrator (2)

Storage devices

Striped resistors

Subtle Errors

Suspended Multivibrator (1)

SW Converter

SW Regenerator

Switch LED garlands

Switch of three garlands on two-color LEDs

Symbolic symbols in electrical circuits

Symmetric Multivibrator

Synthesis of digital circuits

Synthetic indicators and digital display units

Telephone communication between two subscribers

Temperature Indicator (1)

Temperature Indicator (2)

Test probe for testing field-effect transistors

Test probe for testing radio equipment

Test probe for testing transistors

Test probe without battery

Tester of transistors and diodes

Testing transformers and inductors

The light turns on the siren

Theory: Audio Power Amplifiers

Theory: Audio Preamps

Theory: autogenerators

Theory: calculation of oscillatory contours

Theory: frequency synthesizers

Theory: Network Power Supplies with a Transformer

Theory: radio transmitting devices

Theory: Rectifiers

Theory: Sine-Wave Generators

Theory: stabilization of the oscillation frequency

Theory: switching power supplies

Theory: Vage stabilizers

Theory: Volume and Tone Control


This complicated Ohmís law


Three designs of a rural radio amateur

Three devices on an operational Amplifier

Three-level Vage indicator (1)

Three-level Vage indicator (2)

Three-phase current is very simple

Time Relay (1)

Time Relay (2)

Time Relay (3)

Time Relay for the lamp

Touch backlight switch on transistors

Touch switch

Touch time relay for electromechanical toys

Training complex of a beginner radio sportsman

Transistor analogue of a zener diode

Transistor designs of different structure

Transistor Radios

Traveling lights

Triggers (1)

Triggers (2)

Triggers in key and counting devices

Tunable notch filter

Turn indicator for bicycle

TV - color music installation

Two designs with touch controls

Two light beacons

Two options for turning on the flashing LED

Two soldered wiring and replace the battery

Two time relays

Two-level Vage indicator (1)

Two-level Vage indicator (2)

Two-signal power indicator

Two-stage audio frequency Amplifier with transistors of different structure

Two-stage audio frequency Amplifier with transistors of the same structure

Two-transistor radio

Ultrashort Waves

Ultrasonic frequency detector receiver

Umformer and vibrating rectifier

Universal Probe-Indicator

Universal Simulator

Unusual AM Detector

Unusual Detector

Upgrading the sound probe

VHF detector receivers

We catch microns

We control by radio transmitter and receiver

Weigh the variable capacitor

What is decibel

What is decibels

What is DIGITAL?

What is infradin?

What is radio waves?

What the sound looks like

Who is faster?

Who is the first electronic game?

Why amateur radio calculations are needed

Zvitektor and kuproks