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Here you can find useful circuits with description, schematics and PCB, electronics articles and other electronic engineering resources. Projects hosted in our website are contributed by our visitors and partners around the world. We also blog daily about open hardware news. Look around and feel free to comment on anything. Also join the mail list to receive update notifications. - Electronic circuits

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DATASHEET PDF or ZIP
AACircuit1 28 6 AACircuit1 28 6 : AACircuit (ZIP)
Sloa024b - Sallen-Key Filter Design Sloa024b : Sallen-Key Filter Design (PDF)
Sboa081 - Current Feedback Amplifiers Sboa081 : Current Feedback Amplifiers (PDF)
Sloa063 - Filters For Digital Communications Sloa063 : Filters for Digital Communications (PDF)
REF - Electronics Reference Book REF : Electronics Reference Book (PDF)
Op-amps-for-everyone - Op Amps For Everyone (Texas Instruments) Op-amps-for-everyone : Op Amps for everyone (Texas Instruments) (PDF)
Nickelmetalhydride Appman - NiMH Battery Manual Nickelmetalhydride Appman : NiMH Battery Manual (PDF)
BatteryIR - Internal Resistance (IR) BatteryIR : Internal Resistance (IR) (PDF)
Temperat - Temperature Effects Temperat : Temperature Effects (PDF)
Typical Characteristics Typical Characteristics (PDF)
Alkaline Appman - Handbook – Alkaline Alkaline Appman : Handbook – Alkaline (PDF)
Alkalineminiature Appman - Handbook – Alkaline Miniature Alkalineminiature Appman : Handbook – Alkaline Miniature (PDF)
Carbonzinc Appman - Handbook – Carbon Zinc Carbonzinc Appman : Handbook – Carbon Zinc (PDF)
Lithiuml91l92 Appman - Handbook – Lithium – (L91-L92) Lithiuml91l92 Appman : Handbook – Lithium – (L91-L92) (PDF)
Lithiumcoin Appman Lithiumcoin Appman : Coin (PDF)
Silveroxide Appman - Handbook – Silver Oxide Silveroxide Appman : Handbook – Silver Oxide (PDF)
Zincair Appman - Handbook – Zinc Air Zincair Appman : Handbook – Zinc Air (PDF)
Alkalinecylindrical Psds - Battery Safety – Alkaline Manganese Dioxide Zinc (Cylindrical) Alkalinecylindrical Psds : Battery Safety – Alkaline Manganese Dioxide Zinc (Cylindrical) (PDF)
Alkalineminiature Psds - Battery Safety – Alkaline Manganese Dioxide Zinc (Miniature) Alkalineminiature Psds : Battery Safety – Alkaline Manganese Dioxide Zinc (Miniature) (PDF)
Alkzincairmercury Psds - Battery Safety – Alkaline Zinc-Air (Mercury) Alkzincairmercury Psds : Battery Safety – Alkaline Zinc-Air (Mercury) (PDF)
Alkzincairnomercury Psds - Battery Safety – Alkaline Zinc-Air (No Mercury) Alkzincairnomercury Psds : Battery Safety – Alkaline Zinc-Air (No Mercury) (PDF)
Battkit Msds - Battery Safety – Battery Kit (MSDS) Battkit Msds : Battery Safety – Battery Kit (MSDS) (PDF)
Carbonzinc Psds - Battery Safety – Carbon Zinc Carbonzinc Psds : Battery Safety – Carbon Zinc (PDF)
Doubwalllight Psds - Battery Safety – Double Wall Flashlight (2AA) Doubwalllight Psds : Battery Safety – Double Wall Flashlight (2AA) (PDF)
Nickelcadmium Psds - Battery Safety – Nickel Cadmium (NiCd) Nickelcadmium Psds : Battery Safety – Nickel Cadmium (NiCd) (PDF)
Nickelmetalhydride Psds - Battery Safety – Nickel Metal Hydride (NiMH) Nickelmetalhydride Psds : Battery Safety – Nickel Metal Hydride (NiMH) (PDF)
Leadacid Psds - Battery Safety – Lead Acid Leadacid Psds : Battery Safety – Lead Acid (PDF)
Lithiumirondisulfide Psds - Battery Safety – Lithium Iron Disulfide Lithiumirondisulfide Psds : Battery Safety – Lithium Iron Disulfide (PDF)
Lithiummangdioxide Psds - Battery Safety – Lithium Manganese Dioxide Lithiummangdioxide Psds : Battery Safety – Lithium Manganese Dioxide (PDF)
Lithiumion Psds - Battery Safety – Lithium Ion Lithiumion Psds : Battery Safety – Lithium Ion (PDF)
Mercuricoxidezinc Psds - Battery Safety – Mercuric Oxide-Zinc Mercuricoxidezinc Psds : Battery Safety – Mercuric Oxide-Zinc (PDF)
Silveroxidezinc Psds - Battery Safety – Silver Oxide-Zinc Silveroxidezinc Psds : Battery Safety – Silver Oxide-Zinc (PDF)
AN1016-D - Infrared Sensing And Data Transmission AN1016-D : Infrared Sensing and Data Transmission (PDF)
5965-7160E - Digital Modulation In Communication Systems 5965-7160E : Digital Modulation in Communication Systems (PDF)
APR8-sigma-delta - Sigma Delta Principles APR8-sigma-delta : Sigma Delta Principles (PDF)
AC Circuits AC : AC circuits (PDF)
DC Circuits DC : DC circuits (PDF)
DIGI - Digital Circuits DIGI : Digital Circuits (PDF)
REF - Reference REF : Reference (PDF)
EXP - Experiments EXP : Experiments (PDF)
SEMI - Semiconductors SEMI : Semiconductors (PDF)
Abbreviation - IEEE Symbols And Prefixes Abbreviation : IEEE Symbols and Prefixes (PDF)
Opto-couplers - Isolation Techniques Using OptoCouplers Opto-couplers : Isolation Techniques Using OptoCouplers (PDF)
Pictutorial - A PIC16F87X Tutorial Pictutorial : A PIC16F87X Tutorial (PDF)
28123-Whats-a-Micro-v3.0 - What’s A Microcontroller? 28123-Whats-a-Micro-v3.0 : What’s a Microcontroller? (PDF)
AN1057 - Selecting The Right Microcontroller AN1057 : Selecting the Right Microcontroller (PDF)
AN-558 - Introduction To Power MOSFETs AN-558 : Introduction to Power MOSFETs (PDF)
An-1084 - Power MOSFET Basics An-1084 : Power MOSFET Basics (PDF)
Opamp - Introduction To Operational Amplifiers Opamp : Introduction to Operational Amplifiers (PDF)
AN-31 - Op Amp Circuit Collection AN-31 : Op Amp Circuit Collection (PDF)
555AN - Phillips 555 Application Notes 555AN : Phillips 555 Application Notes (PDF)
Fundamental Characteristics Of Thyristors Littelfuse Thyristor Fundamental Characteristics Of Thyristors Application Note : Fundamental Characteristics of Thyristors (PDF)
An31 - Linear Circuits For Digital Systems An31 : Linear Circuits for Digital Systems (PDF)
TupperTank - The TupperTank (A Cheap And Easy To Make Hobby Etching Tank) TupperTank : The TupperTank (A Cheap and Easy to Make Hobby Etching Tank) (PDF)
Pcb Tutorial EN - Make Your Own PCBs Form A To Z Pcb Tutorial EN : Make your own PCBs form A to Z (ZIP)
AN535 - Phase-Locked Loop Design Fundamentals AN535 : Phase-Locked Loop Design Fundamentals (PDF)
MT-086 - Fundamentals Of Phase Locked Loops (PLLs) MT-086 : Fundamentals of Phase Locked Loops (PLLs) (PDF)
19583-pdf Only - Switching Regulators Demystified 19583-pdf Only : Switching Regulators Demystified (PDF)
Feat1-jan03 - Antenna Diversity Feat1-jan03 : Antenna Diversity (PDF)
Antenna - Antennas For Low Power Applications Antenna : Antennas for Low Power Applications (PDF)
Gerber - 1.2V-32V @3A Variable Switching Regulator Gerber : 1.2V-32V @3A Variable Switching Regulator (ZIP)
Gerbers-1 - 5V To 12V @1.2A Regulated Power Supply Using LM2587 Gerbers-1 : 5V to 12V @1.2A regulated power supply using LM2587 (ZIP)
Silk - 5V To 12V @1.2A Regulated Power Supply Using LM2587 Silk : 5V to 12V @1.2A regulated power supply using LM2587 (PDF)
Top - 5V To 12V @1.2A Regulated Power Supply Using LM2587 Top : 5V to 12V @1.2A regulated power supply using LM2587 (PDF)
Bottom - 5V To 12V @1.2A Regulated Power Supply Using LM2587 Bottom : 5V to 12V @1.2A regulated power supply using LM2587 (PDF)
Gerber Files - Gerber files - 12V @ 120mA Transformerless Power Supply Gerber Files : 12V @ 120mA Transformerless Power Supply (ZIP)
PCB-Bottom-1 - 12V @ 120mA Transformerless Power Supply PCB-Bottom-1 : 12V @ 120mA Transformerless Power Supply (PDF)
PCB-SILK - 12V @ 120mA Transformerless Power Supply PCB-SILK : 12V @ 120mA Transformerless Power Supply (PDF)
Gerbers - 12V @ 80mA Transformerless Power Supply Gerbers : 12V @ 80mA Transformerless Power Supply (ZIP)
PCB-SilkScreen - 12V @ 80mA Transformerless Power Supply PCB-SilkScreen : 12V @ 80mA Transformerless Power Supply (PDF)
PCB-Top - 12V @ 80mA Transformerless Power Supply PCB-Top : 12V @ 80mA Transformerless Power Supply (PDF)
PCB-Bottom - 12V @ 80mA Transformerless Power Supply PCB-Bottom : 12V @ 80mA Transformerless Power Supply (PDF)
4-DIGIT-7-SEGMENT-MULTIPLEXED-DISPLAY-1 - 4 Digit 7 Segment 0.5″ Multiplexed Display Module 4-DIGIT-7-SEGMENT-MULTIPLEXED-DISPLAY-1 : 4 Digit 7 Segment 0.5″ Multiplexed Display Module (PDF)
PICASO Datasheet R 1 2 - 4Duino – An Introduction And A Weather API Demo PICASO Datasheet R 1 2 : Picaso (PDF)
4Duino Demo API-1 - 4Duino – An Introduction And A Weather API Demo 4Duino Demo API-1 : 4Duino – An Introduction and a Weather API Demo (ZIP)
PROTOTYPE-BOARD-FOR-MICRO-CONTROLLER-DEVELOPMENT-BOARD - Proto Board With On Board 10X Box Header Connector PROTOTYPE-BOARD-FOR-MICRO-CONTROLLER-DEVELOPMENT-BOARD : Proto Board with On Board 10X Box Header Connector (PDF)
1.2V-to-35V-Adjustable-Regulator-Board 1.2V-to-35V-Adjustable-Regulator-Board (PDF)
12V-TO-28V-stepup-converter 12V-TO-28V-stepup-converter (PDF)
12V-TO-24V-BOOSTER 12V-TO-24V-BOOSTER (PDF)
Laser-Diode-Driver-using-OPA2350 Laser-Diode-Driver-using-OPA2350 (PDF)
9V-TO-60V-PWM-SOLENOID-VALVE-DRIVER 9V-TO-60V-PWM-SOLENOID-VALVE-DRIVER (PDF)
Magnetic-field-sensor-SCHEMATIC Magnetic-field-sensor-SCHEMATIC (PDF)
PCB-dimensions PCB-dimensions (PDF)
ADXL203-Accelerometer-Board ADXL203-Accelerometer-Board (PDF)
2.5A-BIPOLAR-STEPPER-MOTOR-DRIVER 2.5A-BIPOLAR-STEPPER-MOTOR-DRIVER (PDF)
FLEX-SENSOR-TO-BAR-GRAPH-MONITOR FLEX-SENSOR-TO-BAR-GRAPH-MONITOR (PDF)
Function Gererator EAGLE - Function Gererator EAGLE - DDS Function Generator Function Gererator EAGLE : DDS Function Generator (ZIP)
Function Generator - Function Generator - DDS Function Generator Function Generator : DDS Function Generator (ZIP)
VirtualWire VirtualWire (ZIP)
ASK TX DHT22 - Arduino Code For Tx End ASK TX DHT22 : Arduino code for Tx end (ZIP)
ASK RX DHT22 - Arduino Code For Rx End ASK RX DHT22 : Arduino code for Rx end (ZIP)
EgyDuino PDF Files - EgyDuino PDF files EgyDuino PDF Files (ZIP)
EgyDuino Gerber Files - EgyDuino Gerber files EgyDuino Gerber Files (ZIP)
Cdc232.2011-06-24 Cdc232.2011-06-24 (ZIP)
Gerber Files2 - Gerber files2 Gerber Files2 (ZIP)
Clock.sch - Clock.sch Clock.sch (PDF)
Clock.brd - Clock.brd Clock.brd (PDF)
Eagle Eagle (ZIP)
Firmware3 Firmware3 (ZIP)
Gerber Gerber (ZIP)
Code Code (ZIP)
Arduino Solar Day Night Switch Arduino Solar Day Night Switch (ZIP)
L298-DUAL-DC-MOTOR-MODULE L298-DUAL-DC-MOTOR-MODULE (PDF)
Dual-DC-Motor-driver-for-robot-using-L293D Dual-DC-Motor-driver-for-robot-using-L293D (PDF)
AMP Eagle Files - AMP eagle files AMP Eagle Files (ZIP)
AMP Gerber Files - AMP gerber files AMP Gerber Files (ZIP)
Church Bell Controller - Church Bell Controller Church Bell Controller (ZIP)
Bell Controller Manual - Bell Controller manual Bell Controller Manual (ZIP)
Halloween Scare - Halloween Scare Halloween Scare (ZIP)
Motion Activated Led Dice - Motion Activated Led Dice Motion Activated Led Dice (ZIP)
Led Effects Bottom - Led effects bottom Led Effects Bottom (PDF)
Led Effects Top - Led effects top Led Effects Top (PDF)
LED Effects Software - LED effects software LED Effects Software (ZIP)
Led Effects Hardware - Led Effects Hardware Led Effects Hardware (ZIP)
MICROPHONE-PREAMPLIFIER MICROPHONE-PREAMPLIFIER (PDF)
BALANCED-AUDIO-PRE-AMPLIFIER BALANCED-AUDIO-PRE-AMPLIFIER (PDF)
VOICE-RECORD-PLAYBACK-MODULE VOICE-RECORD-PLAYBACK-MODULE (PDF)
LM3886-Audio-Amplifier LM3886-Audio-Amplifier (PDF)
Mini-electret-mike-preamplifier Mini-electret-mike-preamplifier (PDF)
Mini-electret-mike-preamplifier-schematic Mini-electret-mike-preamplifier-schematic (PDF)
SOUND-TO-LIGHT-EFFECT SOUND-TO-LIGHT-EFFECT (PDF)
LM386 Audio Amplifier - LM386 Audio Amplifier LM386 Audio Amplifier (PDF)
Light To Audio Oscilator - Light to Audio Oscilator Light To Audio Oscilator (PDF)
3W-Stereo-Amp-TDA7266D 3W-Stereo-Amp-TDA7266D (PDF)
Voice Changer - Voice Changer Voice Changer (PDF)
Schematic1 Schematic1 (PDF)
Gear Indicator EAGLE Files - Gear Indicator EAGLE files Gear Indicator EAGLE Files (ZIP)
Gear Indicator V1.3 - Gear Indicator v1.3 Gear Indicator V1.3 (ZIP)
PCB Top - PCB Top PCB Top (PDF)
PCB Bottom - PCB Bottom PCB Bottom (PDF)
PCB Silk - PCB Silk PCB Silk (PDF)
MultiSpark MultiSpark (ZIP)
8-PIN-PIC-DEVELOPMENT-BOARD 8-PIN-PIC-DEVELOPMENT-BOARD (PDF)
PIC-16F-28-40-PIN-DEVELOPMENT-BOARD PIC-16F-28-40-PIN-DEVELOPMENT-BOARD (PDF)
PIC18F-DEVELOPMENT-BOARD-USING-PIC-18F4550-18F2550 PIC18F-DEVELOPMENT-BOARD-USING-PIC-18F4550-18F2550 (PDF)
40-Pin-28-Pin-dsPIC-Development-Board 40-Pin-28-Pin-dsPIC-Development-Board (PDF)
PIC16F-28-PIN-PIC-DEVELOPMENT-BOARD-WITH-LCD PIC16F-28-PIN-PIC-DEVELOPMENT-BOARD-WITH-LCD (PDF)
18PIN-PIC-TWOVOLT 18PIN-PIC-TWOVOLT (PDF)
18PIN-PIC-DEVELOPMENT-BOARD 18PIN-PIC-DEVELOPMENT-BOARD (PDF)
ATMEGA8L-Doc ATMEGA8L-Doc (PDF)
ATMEGA8L-PCB ATMEGA8L-PCB (PDF)
ATMEGA8L-SCHEMATIC ATMEGA8L-SCHEMATIC (PDF)
AT89C2051 DEV STICK DOC - AT89C2051 DEV STICK DOC AT89C2051 DEV STICK DOC (PDF)
AT89C2051 DEV STICK PCB - AT89C2051 DEV STICK PCB AT89C2051 DEV STICK PCB (PDF)
AT89C2051 DEV STICK SCHEMATIC - AT89C2051 DEV STICK SCHEMATIC AT89C2051 DEV STICK SCHEMATIC (PDF)
DIGITAL-POTENTIOMETER-USING-OPTICAL-ENCODER DIGITAL-POTENTIOMETER-USING-OPTICAL-ENCODER (PDF)
Quadrature-Clock-Converter Quadrature-Clock-Converter (PDF)
4-Channel-Opto-Isolated-Module 4-Channel-Opto-Isolated-Module (PDF)
64-Key-Infrared-Remote-Controller-Using-PT2222M 64-Key-Infrared-Remote-Controller-Using-PT2222M (PDF)
STEP-DIR-SIGNAL-TO-CW-CWW-SIGNAL-CONVERTER STEP-DIR-SIGNAL-TO-CW-CWW-SIGNAL-CONVERTER (PDF)
8-RELAY-BOARD-WITH-ONBOARD-5V-REGULATOR 8-RELAY-BOARD-WITH-ONBOARD-5V-REGULATOR (PDF)
PDF-DOC PDF-DOC (PDF)
DC Motor Direction Controller - DC Motor Direction Controller DC Motor Direction Controller (PDF)
AC-MOTOR-CONTROLLER-USING-LS7311 AC-MOTOR-CONTROLLER-USING-LS7311 (PDF)
BRUSHED-DC-SERVO-MOTOR-DRIVER-1 BRUSHED-DC-SERVO-MOTOR-DRIVER-1 (PDF)
H-Bridge-DC-Motor-Driver-Module H-Bridge-DC-Motor-Driver-Module (PDF)
L298-Dual-DC-Motor-Driver-Board L298-Dual-DC-Motor-Driver-Board (PDF)
DC-MOTOR-SPEED-DIRECTION-CONTROLLER DC-MOTOR-SPEED-DIRECTION-CONTROLLER (PDF)
Half-Bridge-Based-on-IR2104-SCHEMATIC Half-Bridge-Based-on-IR2104-SCHEMATIC (PDF)
Half-Bridge-Based-on-IR2104 Half-Bridge-Based-on-IR2104 (PDF)
4.5A-Bipolar-Stepper-Motor-Driver-TB6600 4.5A-Bipolar-Stepper-Motor-Driver-TB6600 (PDF)
4.5A-Bipolar-Stepper-Motor-Driver-SCH 4.5A-Bipolar-Stepper-Motor-Driver-SCH (PDF)
Half-Bridge-Driver-based-on-IR2104 Half-Bridge-Driver-based-on-IR2104 (PDF)
5A-H-Bridge-Module-using-MC33886-SCHEMATIC 5A-H-Bridge-Module-using-MC33886-SCHEMATIC (PDF)
5A-H-Bridge-Module-using-MC33886 5A-H-Bridge-Module-using-MC33886 (PDF)
2-Digit-Kitchen-Timer 2-Digit-Kitchen-Timer (PDF)
LM35-THEMOMETER-PIC16F676 LM35-THEMOMETER-PIC16F676 (PDF)
Bargraph-RC-Signal-Reader-RC-Switch Bargraph-RC-Signal-Reader-RC-Switch (PDF)
8-CHANNEL-RS485-DRIVEN-RELAY-BOARD 8-CHANNEL-RS485-DRIVEN-RELAY-BOARD (PDF)
8-CHANNEL-OPTICALLY-ISOLATED-IO-BOARD 8-CHANNEL-OPTICALLY-ISOLATED-IO-BOARD (PDF)
8-TACTILE-SWITCH-INPUT-BOARD 8-TACTILE-SWITCH-INPUT-BOARD (PDF)
7-SEGMENT-LED-BASED-SPI-DISPLAY-USING-74HC595 7-SEGMENT-LED-BASED-SPI-DISPLAY-USING-74HC595 (PDF)
16-Channel-Tiny-Infra-Red-Remote-Controller-NEC 16-Channel-Tiny-Infra-Red-Remote-Controller-NEC (PDF)
2-Digit-Digital-Up-Counter-Using-PIC16F1825 2-Digit-Digital-Up-Counter-Using-PIC16F1825 (PDF)
2-Digit-Digital-Up-Counter-Using-PIC16F1825-DSP 2-Digit-Digital-Up-Counter-Using-PIC16F1825-DSP (PDF)
8-TACTTILE-SWITCH-WITH-HIGH-OR-LOW-OUTPUT-JUMPER-1 8-TACTTILE-SWITCH-WITH-HIGH-OR-LOW-OUTPUT-JUMPER-1 (PDF)
8-LED-OUTPUT-DISPLAY-MODULE-FOR-MICRO-CONTROLLER-DEVELOPMENT-BOARD 8-LED-OUTPUT-DISPLAY-MODULE-FOR-MICRO-CONTROLLER-DEVELOPMENT-BOARD (PDF)
10-PIN-Box-Header-to-Single-Line-Header-Connector 10-PIN-Box-Header-to-Single-Line-Header-Connector (PDF)
Modules-Breakout-Board-001 Modules-Breakout-Board-001- (PDF)
SLIDE-SWITCH-1-2-3 SLIDE-SWITCH-1-2-3 (PDF)
Dual-Relay-Board-SMD Dual-Relay-Board-SMD (PDF)
4-CHANNEL-RELAY-BOARD 4-CHANNEL-RELAY-BOARD (PDF)
LED-Based-Strobe LED-Based-Strobe (PDF)
LARGE-CURRENT-RELAY-DUAL-DC-DC-CONVERTER LARGE-CURRENT-RELAY-DUAL-DC-DC-CONVERTER (PDF)
4-CHANNEL-LARGE-CURRENT-RELAY-BOARD 4-CHANNEL-LARGE-CURRENT-RELAY-BOARD (PDF)

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