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| Contents | |||||||||||||||||||
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| Free PCB Design Tools | |||||||||||||||||||
| FreePCB | Freeware open-source printed circuit board layout editor for Windows. | ||||||||||||||||||
| PCB | An interactive printed circuit board editor for Unix/X11. It includes a rats nest feature, auto-router, trace optimizer, design rule checking, and can provide RS-274-X (Gerber), NC drill, and centroid data (X-Y data) output for use in the board fabrication and assembly process. | ||||||||||||||||||
| PCB Artist | A free schematic capture and PCB Layout program for Windows. | ||||||||||||||||||
| Free Circuit Design/Simulation Tools | |||||||||||||||||||
| LT Spice | Free simulation and design software for analog an mixed signals. Runs on Windows. | ||||||||||||||||||
| OrCAD Demo | Free OrCAD Demo program, which includes demo versions of: OrCAD Capture CIS, PSpice A/D, OrCAD Layout, and SPECCTRA for OrCAD. The limitations of this demo are in the size and complexity of the design. | ||||||||||||||||||
| Solve Elec | Freeware program for MAC and Windows to draw and analyze electrical circuits. | ||||||||||||||||||
| Spice model index | Large alphabetical list of links to sites having spice models. | ||||||||||||||||||
| Spice models | Various spice models and (sub)circuits. | ||||||||||||||||||
| TinyCAD | Freeware open-source program for drawing circuits running on Windows. It includes drawing libraries, a SPICE template engine and can export to PCB design programs. | ||||||||||||||||||
| XCircuit | Open-source circuit-design program for Unix/X11. | ||||||||||||||||||
| Free Electronic Circuits | |||||||||||||||||||
| Bowden's Hobby Circuits | Over 100 circuit diagrams, links to related sites, commercial kits and projects, newsgroups and educational areas. | ||||||||||||||||||
| CXI | CXI stands for "Circuit Exchange International". CXI contains ten categories of schematics, a unified circuit analysis, design and theory page, and also a practical electronic section. | ||||||||||||||||||
| delabs | Free Electronics Circuits Archive with some Technical Documents | ||||||||||||||||||
| Discover Circuits | A collection of 11,000+ electronic circuits or electronic schematics cross-referenced into 500+ categories to find quick solutions for electronic design problems. | ||||||||||||||||||
| Electronic Surveillance | Free schematics for electronics surveillance and intelligence, free RTF (video/audio) wireless transmitter circuits. | ||||||||||||||||||
| Electronics and Radio Today | Free information, articles, and projects for the radio and/or electronics hobbyist. | ||||||||||||||||||
| Electronics Lab | Free electronics circuits with full description, diagrams and PCB, electronics articles, links, downloads, electronic community. | ||||||||||||||||||
| Electronics Project Design | Practical electronics project schematics, parts list, component descriptions, product testing and other references for electronics hobbyist and electronics designer. | ||||||||||||||||||
| FC's Electronic Circuits | Free Circuit Archive | ||||||||||||||||||
| Homo ludens electronicus | Free electronics projects including schematics. | ||||||||||||||||||
| Laurier's Handy Dandy Little Circuits | Free circuits and projects complete with instructions and schematics by Laurier Gendron. | ||||||||||||||||||
| Sam Electronic Circuits | Free schematics of electronic circuits for the hobbyist. The site is in Greek and English. | ||||||||||||||||||
| Simple Circuit Diagram | Various circuits organized by category: audio and music, oscillators, power supply, radio fequency, security, test and mesaurement and more. | ||||||||||||||||||
| Techlib.com | Recommended! Free electronics circuits organized by category, hobby ideas, science, reference, etc. | ||||||||||||||||||
| Connector and Pinout reference | |||||||||||||||||||
| Chipdir | Numerically and functionally ordered chip lists, chip pinouts and lists of manufacturers, electronics books, CDROM's, magazines and links. | ||||||||||||||||||
| Packaging Information | A large number of IC and transistor packages and their dimensions. For example: PDIP, SPDIP, QFN, BGA, metal can, etc. | ||||||||||||||||||
| The Hardware Book | Free collection of connector pinouts and cable descriptions. | ||||||||||||||||||
| Calculators | |||||||||||||||||||
| Resistor Calculator | Calculates the color code from the resistor value and vice versa. It can also calculate the required resistor value for LED circuits. | ||||||||||||||||||
| Vacuum Tubes | |||||||||||||||||||
| Frank's electron Tube Data sheets | Vacuum tubes datasheets. | ||||||||||||||||||
| Vacuum Tube Amplifiers | Tutorial on how do tube amplifiers work. | ||||||||||||||||||
| Hand-Made Vacuum Tubes | Claude Paillard constructs his own vacuum tubes by hand. The site is in french but it contains a lot of photo's and a 17-minute video where you can see him constructing a Vacuum tube from scratch. | ||||||||||||||||||
| Space Charge Tubes | 12-V vacuum tubes and related projects. | ||||||||||||||||||
| Steve's Tube Pages | Schematics, datasheets and other tube-related information. | ||||||||||||||||||
| The Supereheterodyne receiver | A beginner's guide to the superheterodyne principle using Vacuum Tubes. A follow-up article on this subject can be found here: Receiver Technology. | ||||||||||||||||||
| Vacuum tube biasing methods | Tutorial which describes the most common methods of obtaining negative bias voltages in vaccum tube circuits. See also the introductory article What's inside Vacuum tubes. | ||||||||||||||||||
| CRT Tubes | |||||||||||||||||||
| Cathode Corner | Various clock-related electronics projects including a digital clock on a CRT. | ||||||||||||||||||
| Homemade Cathode Ray Tubes | Page by Nyle Steiner on making CRT's including images and descriptions. | ||||||||||||||||||
| Tesla Coils | |||||||||||||||||||
| Information Unlimited | Tesla coil plans, parts and kits (non-free). | ||||||||||||||||||
| Small Tesla Coil | How to design a small tesla coil. | ||||||||||||||||||
| Solid state Tesla coil | Tesla coil schematics and pictures using Mosfets, transistors and a TL494 (pulse-width modulation controller IC). | ||||||||||||||||||
| Solid state tesla coil with 555 timer | Small Tesla coil circuit using a 555 timer IC and a power transistor. | ||||||||||||||||||
| Tesla Coil Construction Guide | Tutorial for building your own Tesla coil. | ||||||||||||||||||
| TeslaMap | Free Telsa Coil design program for Windows | ||||||||||||||||||
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| Radio | |||||||||||||||||||
| Crystal Radio Circuits | Various projects, like a simple crystal radio, one-transistor amplifier/detector, LF and RF amplifier, very high gain crystal earphone amplifier, two-transistor radio, experiments with detector diodes. | ||||||||||||||||||
| Dave's Homemade Radios | Schematics, part-lists, photo's and descriptions of Dave's homemade radios, amplifiers and antennas. | ||||||||||||||||||
| FM Crystal Radio | Detailed instruction and photographs on building an FM crystal radio. | ||||||||||||||||||
| Gollum's Crystal Receiver World | Crystal receivers construction projects, schematics, tips and tricks. | ||||||||||||||||||
| Home made radio | Very clear and practical page on building (crystal) radios and how they work. | ||||||||||||||||||
| Homemade Coherer | A coherer is a type of radio-signal detector which was used around 1900. This article shows how to create your own coherer using just metal filings and a few pieces of metal. | ||||||||||||||||||
| The XTal set society | Website dedicated to building (and experimenting with) radios and crystal receivers. | ||||||||||||||||||
| Special Oscillators | |||||||||||||||||||
| Neon Relaxation Oscillator | An oscillator consisting of a neon bulb connected across the capacitor in an RC circuit. | ||||||||||||||||||
| Carbon Arc RF Oscillator | A radio frequency oscillator using a capacitor, a coil and a carbon arc (it functions using 450V DC but without any active components such as tubes or transistors). | ||||||||||||||||||
| Electronics parts | |||||||||||||||||||
| 4 Star Electronics | Supplier of obsolete electronics components. | ||||||||||||||||||
| Conrad | Big online shop for electronics components and related products. | ||||||||||||||||||
| Digi-Key | Online shop for electronics parts. USA-based. | ||||||||||||||||||
| electronics-eom | A large index of electronics manufacturers on the Net, ordered by category or alphabetically. | ||||||||||||||||||
| Electronix Express | Online electronics store based in New Jersey, USA. | ||||||||||||||||||
| Electrospec Obsolete Electronic Parts | Supplier of discontinued end of life electronic parts | ||||||||||||||||||
| FindChips.com | Search engine, which searches the inventory of over 20 distributors for all types of electronics, including passives, connectors, optoelectronics, chips, and more. | ||||||||||||||||||
| Radio Rotor | Online shop based in the Netherlands. | ||||||||||||||||||
| Segor-electronics | Online shop for electronics components in Germany. | ||||||||||||||||||
| Sphere | Lots of interesting used electronics parts and test equipment. | ||||||||||||||||||
| The Electronics Source Book | Search engine for finding electronics components, manufacturers and distributors. | ||||||||||||||||||
| WireTronic | Specialized in all types of wire, including resistance wire, tungsten wire, magnet wire, litz wire, nickel alloys, copper silver, platinum, palladium, tungsten, titanium, stainless steel, etc. | ||||||||||||||||||
| Datasheets | |||||||||||||||||||
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| Music and Electronics | |||||||||||||||||||
| E-Music DIY Archive | Schematics, manuals, reference, information related to electronic music. | ||||||||||||||||||
| Marjan's Synthesizer Schematics | Various synthesizer-related schematics. | ||||||||||||||||||
| musicsynthesizer.com | "Dedicated to those intrepid souls who build their own electronic musical instruments". | ||||||||||||||||||
| Synth DIY | Site dedicated to synthesizers and do-it-yourself synthesizer building. | ||||||||||||||||||
| Synthesizer DIY pages | Free electronics cicruits for analog synthesizers, such as: VCO's, VCA's, filters, a noice generator, ADSR envelope generators, etc. | ||||||||||||||||||
| Digital Signal Processing | |||||||||||||||||||
| dspGuru | Online reference information, tutorials for beginners, tips and insights of interest to intermediate and advanced DSPers, DSP-related links, open source software for use in Digital Signal Processing. | ||||||||||||||||||
| Microprocessors, Microcontrollers, Embedded | |||||||||||||||||||
| Arduino | An open-source processing platform based on the Atmel AVR microcontroller. | ||||||||||||||||||
| AVR Freaks | Website devoted to the popular AVR microcontroller family. | ||||||||||||||||||
| Beagle Board | Low-cost, single-board computer with an ARM processor, 128 Mb, memory, SVideo, USB and a number of standard PC peripherals. | ||||||||||||||||||
| eg3 | Information related to embedded systems, fpga's, rtos, etc. | ||||||||||||||||||
| Hawk Board | Low-cost, single-board computer with an ARM processor, 128 Mb, memory, VGA, USB (OTG), ethernet, serial port, Sata, MMC/SD, audio in/out, video in. | ||||||||||||||||||
| I2C Bus Overview | Useful site containing lots of information on the I2C bi-directional 2-wire bus. | ||||||||||||||||||
| I2C-Bus.org | The I2C-bus home page. | ||||||||||||||||||
| Lakeview Research | A developer's resource for computer interfacing, especially USB, mass storage, serial (COM) ports, Ethernet and Internet communications for embedded systems, and parallel port. | ||||||||||||||||||
| Microcontroller.com | Various projects for AVR- and M16C - Microcontrollers. | ||||||||||||||||||
| Propeller | Low-cost, high-performance processor containing eight (32-bit, 80 Mhz) processors, 32Kb Rom and 32Kb Ram on one chip which allows for real simultaneous multi-processing.
The Propeller chip can be programmed in both the high-level language 'Spin', and assembly. Various low-cost evaluation kits are available for around $ 100, such as the Propeller Starter Kit. See also these links and this Wikipedia article. | ||||||||||||||||||
| SPI - Serial Peripheral Interface | A good introduction on the Serial Peripheral Interface. | ||||||||||||||||||
| Microcontroller & Microprocessor Programming | |||||||||||||||||||
| 8085 SDK | Integrated IDE for 8085 development. It includes an assembler, editor, debugger, simulator, help file and other tools. | ||||||||||||||||||
| AS | Free Macro Assembler supporting a
variety of microprocessors:
- Motorola 68000..68040,683xx incl.
Coprocessor and MMU,
ColdFire,DSP5600x,DSP56300
MPC601/MPC505/PPC403,M-Core,
6800, 6805, 68HC08, 6809,
68(HC)11, 68HC12, 68HC16
- Hitachi 6301, 6309, H8/300(H),
H8/500, SH7000/7600/7700
- Rockwell 6502, 65(S)C02
- CMD 65816
- Mitsubishi MELPS-740, MELPS-7700,
MELPS-4500, M16, M16C
- Intel 4004, MCS-48/41, MCS-51/251,
MCS-96/196(Nx)/296,
8080/8085, i960
- Signetics 8X30x
- Philips XA
- Atmel AVR
- AMD 29K
- Siemens 80C166/167
- Zilog Z80, Z180, Z380, Z8
- Toshiba TLCS-900(L), TLCS-90,
TLCS-870, TLCS-47
TLCS-9000
- Microchip PIC16C54..16C57,
PIC16C84/PIC16C64
PIC17C42
- SGS-Thomson ST6, ST7, ST9, 6804
- Texas Instruments TMS32010/32015,
TMS3202x
TMS320C3x,
TMS320C20x/TMS320C5x
TMS320C6x, TMS9900,
TMS7000, TMS370xxx
MSP430
- National Semiconductor SC/MP, COP8, SC144xx
- Fairchild ACE
- NEC µPD78(C)1x, µPD75xxx (alias 75K0),
µPD78xxx (alias 78K0)
µPD7720/7725,
µPD77230 (alias 75K0),
µPD78xxx (alias 78K0)
µPD7720/7725, µPD77230
- Fujitsu F²MC8L
- Symbios Logic SYM53C8xx
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| ASEM-51 | A two-pass macro assembler for the Intel MCS-51 family of microcontrollers. It is running on the PC under MS-DOS, Windows and Linux. | ||||||||||||||||||
| EASy68K | Editor, assembler, simulator and IDE for the 68000 instruction set. Freeware for Windows. | ||||||||||||||||||
| HXA | Cross assembler supporting 6502-family processors (6502, 65C02, R65C02, W65C02S, W65C816S). | ||||||||||||||||||
| Z390 | Portable mainframe macro assembler, linker, and emulator. Freeware, open-source, created in Java. | ||||||||||||||||||
| FPGA's, Programmable logic | |||||||||||||||||||
| fpga4fun.com | FPGA projects, tutorials and boards. | ||||||||||||||||||
| John's FPGA Page | VHDL reference & tutorials; FPGA boards, design tools & projects. | ||||||||||||||||||
| FPGA links | Links to FPGAs and programmable logic devices. | ||||||||||||||||||
| Robotics | |||||||||||||||||||
| RobotProg | Freeware robot-simulation program for MAC and Windows. First you draw the flowchart, then you run the program and watch one or more robots executing your program. | ||||||||||||||||||
| Electro Mechanics | |||||||||||||||||||
| Cupcake CNC | A 3D printer (or rapid prototyping CNC machine) kit for $ 750. | ||||||||||||||||||
| MikroKopter | Build your own micro helicopter. | ||||||||||||||||||
| Wind powered devices | |||||||||||||||||||
| Chispito Wind Generator | How to guild a Chispito wind generator. | ||||||||||||||||||
| DIY 1000 watt wind turbine | Detailed instructions on how to build a 1000 wat wind turbine including the generator part. | ||||||||||||||||||
| How I home-built an electricity producing Wind turbine | How to build a Wind turbine using an electric motor as a generator. | ||||||||||||||||||
| Scoraig Wind Electric | Numerous plans and articles on creating wind generators. | ||||||||||||||||||
| Human powered devices | |||||||||||||||||||
| Dynamo Flashlight | Schematics of a dynamo flashlight. German language. | ||||||||||||||||||
| Freeplay Energy | Affordable human-powered products with a hand crank to generate electricity: a radio, flashlights, a 12-V generator. | ||||||||||||||||||
| Shake it like a Tic-Tac! | Schematics for a rechargeable led flashlight powered by magnets housed in the obligatory mints container. | ||||||||||||||||||
| Shake led flashlight | How to make your own hand powered shake led flashlight. | ||||||||||||||||||
| Retro Electronics | |||||||||||||||||||
| Vintage Calculators Web Museum | Mechanical and early electronic desk calculators, strange hand-held calculators. articles, photographs, and databases from the archives of the International Association of Calculator Collectors. Information and photographs for those interested in the history of technology. | ||||||||||||||||||
| Electronics Tutorials | |||||||||||||||||||
| All About Circuits | A series of online textbox on electricity and electronics for both students and hobbyists. | ||||||||||||||||||
| Basic Circuits of Operational Amplifiers | Operational amplifiers explained, including Java-applets which simluate various opamp principles. | ||||||||||||||||||
| Educypedia: electronics | Large directory of links to electronics tutorials, ordered by category. | ||||||||||||||||||
| Electrolytic capacitors | What makes those "cans" tick, and how not to make them blow up. | ||||||||||||||||||
| Electronics 2000 | A beginners guide to project building, technical data, interactive formulae calculators, software downloads, links to other sites and more. | ||||||||||||||||||
| Electronics Tutorials | Over 120 free individual electronics tutorials covering a very wide range of electronics. | ||||||||||||||||||
| ElectronicsTheory.com | Free online electronics course. | ||||||||||||||||||
| ikalogic Projects and tutorials | Electronics and Robotics projects and tutorials. They are all explained clearly with pictures and schematics. | ||||||||||||||||||
| Lessons In Electric Circuits | A free series of textbooks on the subjects of electricity and electronics. Recommended! | ||||||||||||||||||
| NEETS | Electricity and electronics classes as PDF files. Navy Electricity and Electronics Training Series, free download. | ||||||||||||||||||
| Radio Receivers | Excellent online book on all types of radio receivers, including theory, practial examples and working schematics. | ||||||||||||||||||
| Radio-Electronics.com | Free information, articles, tutorials and data for the radio and electronics industries about all aspects of radio and electronics. | ||||||||||||||||||
| The Basic Soldering Guide | Helps beginners and novices to obtain effective results when soldering electronic components. | ||||||||||||||||||
| the Electronics Club | Very good practical starting point for beginners. | ||||||||||||||||||
| The Play-Hookey Website | Computers, digital logic, dc electronic theory, ac electronic theory, oscillators, op amps, analog circuits, optics. | ||||||||||||||||||
| Tuned circuits | What makes those "cans" tick, and how not to make them blow up. | ||||||||||||||||||
| Understanding Electronics Components | Online book explaining resistors, capacitors, transformers, transistors, integrated circuits, etc. Includes theory as well as practical examples. | ||||||||||||||||||
| Books | |||||||||||||||||||
| Technical books online! | A large number of free electronics books (from the vacuum tube age) as PDF. | ||||||||||||||||||
| Online Electronics Education | |||||||||||||||||||
| World College | Online Bachelor's degrees in computer systems and electronics engineering for $100 per month. | ||||||||||||||||||
| Cleveland Institute of Electronics | Various associate degrees and other courses in Electronics and Information Technology. | ||||||||||||||||||
| Electronics News | |||||||||||||||||||
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| Free Electronics Resources | |||||||||||||||||||
| Audiologica | Articles and tutorials on DIY audio electroncis. | ||||||||||||||||||
| DigiBarn | The DigiBarn Computer Museum | ||||||||||||||||||
| DIY Links Resource | A wealth of electronics-related links organized by category. | ||||||||||||||||||
| Electronics Hobbyist | Articles, tutorials, links, etc. | ||||||||||||||||||
| Electronics Symbols: wikibooks | Wikibooks page containing electronics symbols. | ||||||||||||||||||
| Electronics Symbols: wmf and gif | Electronics symbols which you can download as WMF or GIF files. | ||||||||||||||||||
| ePanorama.net | Useful, large electronics portal and reference site. | ||||||||||||||||||
| FreePatentsOnline.com | Free, fast and easy-to-use access to millions of patents and patent applications, including a patent search engine, an ever-expanding data collection. | ||||||||||||||||||
| Leroy's Engineering Web Site | An Indexed listing of Electronic Engineering Web Sites of Component and OEM Equipment Manufactures: Analog and Digital Integrated Circuits [ICs]; Memory, Processor and Programmable Logic IC's, Bus Interface IC's, Passive, and Mechanical components; Resistors, Capacitors, Inductors and Sensors, EDA Software vendors, Electrical Engineering Standards and Specifications, On-Line Publications, Computers, Power Supplies, Electronic Enclosures, Chassis, Racks, Backplanes, Mother Boards, and Test Equipment manufacturers. Provides detailed design information regarding Interface, Computer, Cable, Processor and Embedded Buses. | ||||||||||||||||||
| Tangentsoft Electronics | Electronics projects, articles, tutorials and book reviews. | ||||||||||||||||||
| The Hobby Electronics from Japan | Circuits, tutorials, resources, electronics software, etc. | ||||||||||||||||||
| TKB-4u | "The Technical Knowledge Base for You": articles, information and news related to electronics. | ||||||||||||||||||
| US Patent Search | Enter the US patent number and download full issued patents and patent applications for free. | ||||||||||||||||||
| WebEE | Schematics, tutorials, online calculators, newsgroups, magazines, etc. | ||||||||||||||||||
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| Free Office Software | Free office suites, word processors, desktop publishing, text editors, personal databases, diagram software, presentation programs, fonts, document viewers, PDF utilities, thesauri, spellcheckers, document converters, etc. | ||||||||||||||||||
| Free CAD software | Free Mechanical Engineering software for a variety of platforms. | ||||||||||||||||||
| Free Computers | Free used and recycled computers, mostly for schools, non-profit organisations and disadvantaged individuals. | ||||||||||||||||||
| Free eBooks | Free ebooks, free eBook authoring tols, free photo albums. | ||||||||||||||||||
| Free File and Disk utilities | Various file and disk utilities. | ||||||||||||||||||
| Education On-line | Online courses, education for kids, online university education, educational resources. | ||||||||||||||||||
| Free Programming Tools | Free programming tools for Windows, Linux, etc. Free C++, C, Delphi, Basic, Assembler, Cobol, Pascal, Java, SQL, Databases; links to free compilers, databases, interpreters, IDE's, installers, components, libraries, languages, helpfile generators and more. | ||||||||||||||||||
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| Freebyte Music Zone | Free MP3 files, midi files, free music videos, free sheet music, free samples and loops, online music lessons, music and audio search engines, etc. | ||||||||||||||||||
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| Freebyte Reference Desk | Free online encyclopedias, maps, satellite images, electronics, computing, physics, science, etc. | ||||||||||||||||||
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| Information wanted! | |||||||||||||||||||
| If you know of any good free and/or interesting Electronics software, directories and other resources, which are not listed here, please let us know! | |||||||||||||||||||
| About this page | |||||||||||||||||||
| Last updated on August 23, 2010
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