Electronics Projects


electronics projects

Projects

Batteries
How to Recharge Batteries with a DC Power Supply
How to Recharge Batteries with Solar Cells
How to Build a Battery Tester
How to Build a Battery Eliminator

Switches
How to Build a Reed Switch Circuit
IC Switches
How to Build a 4066 Bilateral Switch Circuit

Resistors
How to Connect a Pull Up Resistor
How to Connect a Pull Down Resistor
How to Divide Voltage in Half with Resistors

Inductors
Inductive Sensors
How to Build an NPN Inductive Proximity Sensor Circuit
How to Build a PNP Inductive Proximity Sensor Circuit

Capacitors
How to Charge a Capacitor
How to Use a Charged Capacitor to Light an LED
How to Discharge a Capacitor

Diodes
General Diodes
How to Build a Diode Clipper Circuit
How to Build a Diode Clamper Circuit
Protection Diodes
How to Connect a Protection Diode in a Circuit
Germanium Diode
How to Build a Germanium Diode Circuit
Laser Diodes
How to Build a Laser Diode Circuit
Zener Diodes
How to Build a Zener Diode Voltage Regulator
How to Build a Voltage Level Indicator with a Zener Diode
How to Build a Voltmeter Circuit with Zener Diodes

LEDs
Plain LED
How to Vary the Brightness of an LED
How to Build an LED Driver Circuit
How to Build an LED Flasher Circuit
LED Bar Graph
How to Build a 10 Segment LED Bar Graph Circuit with Manual Pushbutton Control
How to Build an LM3914 Dot/Bar Display Driver Circuit
Blinking LED
How to Build a Blinking LED Circuit
Infrared LED
How to Build an IR LED Circuit
How to Build an Infrared Receiver Circuit with an IR Phototransistor
How to Build an Infrared Detector Circuit
How to Build a Proximity Detector Circuit
UV LED
How to Build a UV LED Circuit
RGB LED
How to Build a Common Cathode RGB LED Circuit
How to Build a Common Anode RGB LED Circuit
LEDs/Lamps
How to Build a Light Dimmer Circuit

Buzzers
How to Build a Buzzer Circuit
How to Vary the Volume of a Buzzer
How to Make a Buzzer Produce a Chirping Sound
How to Make a Buzzer Produce a Warbling Sound

Photoresistors
How to Build a Simple Photoresistor Circuit
How to Build a Dark-activated Switch
How to Build a Dark-activated Light Circuit
How to Build a Dark-activated Buzzer Circuit
How to Build a Dark-activated Motor Circuit
How to Build a Night Light Circuit with an LM741 Op Amp
How to Build a Night Light Circuit with a NAND Gate Chip
How to Build a Light-activated Motor Circuit
How to Build a Light-activated Buzzer Circuit
How to Build a Light Detector Circuit with a NAND Gate Chip


Transistors
How to Connect a Transistor as a Switch in a Circuit
How to Build an Inverter with a Transistor
How to Connect a Transistor in a Circuit for Current Amplification
How to Build a Voltage Amplifier Circuit with a Transistor
How to Build an Emitter Follower Circuit
How to Build a Buffer Circuit with a Transistor
BJTs
How to Connect a PNP Transistor in a Circuit
MOSFETS
How to Build an N-Channel MOSFET Switch Circuit
How to Build a P-Channel MOSFET Switch Circuit
JFETs
How to Build an N-Channel JFET Switch Circuit
How to Build a P-Channel JFET Switch Circuit
Phototransistors
How to Build a Simple Phototransistor Circuit

Flex Sensor
How to Build a Flex Sensor Circuit with a Voltage Comparator

Thermistors
How to Build Simple (NTC and PTC) Thermistor Circuits

Varistors
How to Build a Simple Varistor Circuit

Buffer Circuit
How to Build a Buffer Circuit with a 4050 Chip
How to Build a Buffer with NAND Gates

Peak Voltage Detector
How to Build a Peak Voltage Detector Circuit
How to Build a Precision Peak Detector Circuit
How to Build a Peak-to-Peak Detector Circuit

Transformer Circuit
How to Build a Transformer Circuit

Power Inverter Circuit
How to Build a Power Inverter Circuit

Overvoltage Protection Circuit
How to Build an Overvoltage Protection Circuit

Transient Voltage Suppressors
How to Build a Transient Voltage Suppressor (TVS) Circuit

Relays
How to Build a Relay Driver Circuit

Comparator Circuits
How to Use the LM741 Op Amp as a Comparator
How to Build a Comparator Circuit with an LM311
How to Build a Comparator Circuit with an LM393
How to Build an LM339 Quad Voltage Comparator Circuit
How to Build a Window Comparator Circuit
How to Build a Modified Window Comparator Circuit

Touch Sensor
How to Build a Touch Sensor Circuit (with a transistor)
How to Build a Touch Sensor Circuit with a NAND Gate Chip
How to Build a Touch Sensor Circuit with a Voltage Comparator Chip

Touch On-Off Circuit
How to Build a Touch On-Off Circuit with a 4011 NAND Gate Chip
How to Build a Touch On-Off Circuit with a 4001 NOR Gate Chip
How to Build a Touch On-Off Circuit with a 7414 Inverter Gate Chip
How to Build a Touch On-Off Circuit with a 4049 Inverter Gate Chip

Tilt Sensor
How to Build a Simple Tilt Sensor Circuit

Accelerometer
How to Build an Accelerometer Circuit

Op Amp Circuits
How to Build a Voltage Gain Op Amp Circuit
How to Build a Non-inverting Op Amp Circuit
How to Build an Inverting Op Amp Circuit
How to Build a Difference Amplifier Circuit
How to Build an Integrator Op Amp Circuit
How to Build a Differentiator Op Amp Circuit
How to Build a Summing Amplifier Circuit

Microphones
How to Build a Simple Microphone circuit
How to Build an Electret Microphone Circuit
How to Build a Microphone Amplifier Circuit
How to Build a Sound Detector Circuit
How to Build a Sound Imitator Circuit

Speakers
How to Build a Simple Speaker Circuit
How to Build a Speaker Circuit with Adjustable Volume
How to Build a Speaker Crossover Network Circuit

Motors
How to Build a DC Motor Circuit
How to Build a DC Motor Driver Circuit
How to Build an H-bridge Circuit with Transistors
How to Build an H-bridge Circuit (with an L293 Chip)
How to Build an H-bridge Circuit to Control 2 Motors
How to Build an H-bridge Circuit to Control 4 Motors
How to Build a Servo Motor Circuit
How to Build an Electric Fan

Peristaltic Pump
How to Build a Peristaltic Pump Circuit

Fans
How to Build a DC Fan Circuit
How to Build an AC Fan Circuit

Hall Effect Sensor Circuit
How to Build a Hall Effect Sensor Circuit

Motion Detector Circuit
How to Build a Motion Detector Circuit
How to Build a Motion Sensor Light Circuit
How to Build a Motion Detector Circuit Using an Infrared Proximity Switch Sensor

Vibration Detector Circuit
How to Build a Vibration Detector Circuit
How to Build a Piezo Knock Sensor Circuit

Vibration Motor
How to Build a Vibration Motor Circuit

Latch Circuit
How to Build a Latch Circuit with Transistors

Alarm Circuits
How to Build a Motion Detector Alarm Circuit
How to Build a Vibration Alarm Circuit
How to Build a Light Alarm Circuit
How to Build a Sound Alarm Circuit
How to Build a Heat Alarm Circuit
How to Build a Tilt Alarm Circuit
How to Build a Door Alarm Circuit
How to Build an Alarm Circuit with Transistors

Logic
Building Logic Gates
How to Build a Diode AND Gate Circuit
How to Build a Diode OR Gate Circuit

Logic Chip Circuits
How to Build a Simple NAND Gate Circuit Using a 4011 Chip
How to Build an AND Gate from NAND Gates
How to Build a Tri-state Buffer Circuit with a 74HC125 Chip
How to Build a Logic Probe

Adder Circuits
How to Build a Half Adder Circuit

Flip Flop Circuits
How to Build a D Flip Flop Circuit with a 4013 Chip

Oscillator/Clock Circuits
How to Build a Clock Circuit with a 555 timer
How to Build an Adjustable Square Wave Generator Circuit with a 555 Timer
How to Build an Astable Multivibrator Circuit with Transistors
How to Build a Multivibrator Circuit with a 4047 chip (for astable mode operation)
How to Build an Astable Multivibrator Circuit with a 4049 Inverter Chip
How to Build an Astable Multivibrator Circuit with a 4011 NAND Gate Chip
How to Build an Astable Multivibrator Circuit with an LM741 Op Amp
How to Build a Voltage-Controlled Oscillator Circuit with a 4046 Chip
How to Build a Relaxation Oscillator Circuit with a Transistor
How to Build a Wien Bridge Oscillator Circuit with an LM741 Op Amp IC
How to Build an Oscillator Circuit with a 7414 Schmitt Trigger Inverter Chip
How to Build a Sine Wave Generator Ciruit with a Single Transistor
How to Build a Sine Wave Generator Circuit with a 555 Timer
How to Build a Triangle Wave Generator Circuit with a 555 Timer
How to Build a Triangle Wave Generator Circuit with an LM741 Op Amp
How to Build a Ramp Generator with Transistors
How to Build a Square-to-Triangle Wave Converter Circuit
How to Build a Triangle to Sine Wave Converter Circuit
How to Build a Square-to-Sine Wave Converter Circuit
How to Build a Voltage-controlled Oscillator with a 555 Timer Chip
How to Build an LC Resonant Circuit
How to Build an LC Tank Circuit

Function Generator Circuit
How to Build a Simple Function Generator Circuit (with an LM324 Op Amp chip)

Real-time Clock Circuit
How to Build a Real-time Clock Circuit with a DS1307 Chip

Filter Circuits
How to Build a Passive Bandpass Filter Circuit
How to Build an Active Bandpass Filter Circuit with an Op Amp
How to Build an Active Low Pass Filter Circuit with an Op Amp
How to Build an Active High Pass Filter Circuit with an Op Amp

Delay Circuits
How to Build a 555 Timer Delay Before Turn On Circuit
How to Build a 555 Timer Delay Before Turn Off Circuit

Monostable Circuit
How to Build a Monostable Multivibrator Circuit with Transistors
How to Build a Monostable Circuit with a 555 Timer Chip

Bistable Circuit
How to Build a Bistable Circuit with a 555 Timer Chip
How to Build a Bistable Multivibrator Circuit with Transistors

Decade Counter Circuit
How to Build a Decade Counter Circuit with a 4017 Chip

Decoder/Demultiplexer Circuit
How to Build a 74HC238 Decoder Circuit
How to Build a BCD to 7-Segment Display Decoder Circuit with a 4511 Chip

Counter Circuit
How to Build a Binary Up/Down Counter with a 4516 Chip

Flip Flops
How to Build a D Flip Flop with NAND gates

Register Circuits
How to Build a Register Circuit with a 4094 Chip
How to Cascade 4094 Registers
How to Build a Shift Register Circuit with a 74HC595 Chip
How to Build a Register Circuit with a 74HC165 Chip

Attenuator
How to Build a Simple Attenuator Circuit

Voltage Circuits
How to Build a Voltage Sensor Circuit
How to Build a Voltage Polarity Indicator Circuit
Voltage Multiplier Circuits
DC-to-DC
How to Build a DC-to-DC Boost Converter Circuit
AC-to-DC
How to Build a Voltage Doubler Circuit
How to Build a Voltage Tripler Circuit
How to Build a Voltage Quadrupler Circuit
Voltage Stabilizer Circuit
How to Build a Voltage Stabilizer Circuit Using a Buffer

Current Circuits
How to Build a Current Sensor Circuit
How to Build a Current Source Circuit

Optocoupler
How to Build an Optocoupler (Optoisolator) Circuit

Radio Circuits
How to Build an AM Radio Circuit with a ZN416E Chip

USB
How to Build a USB-powered Device

Talking Toy Circuit
How You Can Build Your Own Talking Toy

Robot Car
How to Build an Object-detecting Robot Car

Metal Detector Circuit
How to Build a Metal Detector Circuit

DC Power Supply
How to Build a DC Power Supply
How to Build a Dual Polarity Power Supply Circuit
How to Build a Switch Mode Power Supply Circuit with an MC34063 Chip

Continuity Tester
How to Build a Continuity Tester Circuit

Projects with Arduino
Arduino Circuits