STUDENTS FROM "THE LAND OF PURE": Electronic Projects 4

ELECTRONIC PROJECTS

Alarm and Security

Amplifiers

Audio and Music

Optimized Semiconductor Noise Source
Symmetric Noise Source
US-Style Siren
Multi-Sound For Guitars
General Purpose Oscillator
Oscillation Monitor
Pan Pot
Mini Audio Signal Generator
Sounds From The Old West
Guitar Control
Cheapskate's Headset Adapter
Dual Input-Combining Stereo Line Amplifier
Steam Whistle
Audio Level Threshold Control
Multi-Melody Generator With Instrumental Effect
IR Music Transmitter and Receiver
Multi-tone Siren
Sound Source Locator Uses PreChamp
Audible Flasher Warning
Surf Simulator Circuit Diagram
When The Siren Sounds - A Useful Circuit
Simple White Noise Generator
Balanced-Unbalanced Converter For Audio Work
Automatic Loudness Control
Cuckoo Sound Generator
Cricket Chirping Generator
Bells Ring Generator
Melody Generator
4 Channel Portable Audio Mixer
Music Generator Schematic Using UM66
Laptop Audio-Out Splitter
Three Channel Audio Mixer
Digital Volume Control
Stereo to Mono Converter Based on FET
Three Channel Audio Splitter

Automotive

Battery and Chargers

Battery Juicer
Li-Ion Battery Charger
Lead Acid Battery Charger #1
Lead Acid Battery Charger #2
Deluxe Charge Rate Limiter for Small Capacity NiCad Batteries
Electric Window/Fence Charger
Versatile Micro-power Battery Protector
Battery Equality Monitor
12 Volt Battery Guardian
Battery Saver
PC-Powered Battery Charger
A 12V Car Charger For ASUS Eee Notebook
Simple Battery Discharger Using Discrete Components
Battery Charger Display Using LT1639
Battery Switch With Low-Dropout Regulator
Motorcycle Battery Monitor
NiCd Battery Charger
Float Charger For NiMH Cells
Simple Battery Isolator
Simple NiCd Battery Charger
NiMH Charger For Up To Six Cells
Nicad Charger Uses Voltage Cut-Out
Battery Desulphation Progress Monitor
Storage Battery Exerciser
Switch-less NiCd-NiMH Battery Charger
Solar-Powered High Efficiency Battery Charger
Low-Voltage Cutout For 12V SLA Batteries
Bike Battery Charger
Simple Battery Charger - Charges Upto 12 NiCD Cells
Solar Battery Protector Prevents excessive Discharge
Low Cost Battery Condition Indicator
12V Lead Acid Battery Desulphator
High-Current Battery Discharger
Solar Panel Based Charger And Small LED Lamp
Battery Charger Regulator
Low-Power Car/Bike USB Charger
Lithium-Polymer Peak Charger
In-Car Charger And Switcher For SLA Battery
Mobile Phone Travel Charger
NiCd Battery Charger With Reverse Polarity Protection
NiMh and NiCd Battery Charger
USB Powered Mobile Phone Battery Charger
12 Volt Car Battery Charger
A Friendly Charger for Mobile Phones
Low Cost Universal Battery Charger
Mobile Cell phone Battery Charger
Mobile Phone and iPod Battery Charger
Mobile Phone Battery Charger
Dry Cell Battery Charger Using LM741

Boosters

Step-Up Booster Powers Eight White LEDs
Input Impedance Booster II
Input Impedance Booster
10,000x With One Transistor
Low-Power Voltage Doubler (Booster)
Pump it up: Mp3 Booster
Ampere or Current Booster Circuit
Bass Booster Circuit
Audio Booster

Clock and Timers

Computer Related

Filters and Oscillators

Baud Rate Generator
Comparator Based Crystal Oscillator
HQ Notch Filter Without Close-Tolerance Components
Simple Function Generator
Very Low Power 32kHz Oscillator
Voice Bandwidth Filter

Health and Hobby

Home and Garden

Indicators

IR (Infra-Red)

Inverters and Converters

500W Low Cost 12V to 220V Inverter
UPS For Cordless Telephones
Discrete Voltage Inverter
Voltage Inverter Using Switch-Mode Regulator
4-Bit Analogue to Digital Converter
12V Fluorescent Lamp Inverter
Cheap 12V to 220V Inverter
Inverter For Soldering Iron
100W Inverter

Lights and LEDs

White LED Lamp
12 Volt DC Fluorescent Lamp Driver
Fine Control Super Bright LED Pulser
Bar-Mode Lights Sequencer
LED–LDR Blinker
Magic Lights
Picnic Lamp
High-Intensity, Energy-Efficient LED Light
Soft Start For Torch - Increases The Life Of Torch Bulbs
Two-Position Dimmer
220V AC Powered Blinking LED
EL Lamp Driver Using HV832MG
Vehicle Interior Lighting With Switch-Off Delay
LED Flasher
Reflector For Pedestrians
Mains Powered White LED Lamp
Luxury Car Interior Light
Multi-Color LED
Automatic Light Dimmer
6-Channel Running Light
LED Lighting For Consumer Unit Cupboard
Light From Flat Batteries
Flickering Light II
30mA LED Dimmer
Backup Lamp
Dimmer With A MOS-FET
1W LED Driver
UV Torch Light
LED Light Pen
Irregular Flasher
Bluish Flasher
Novel White LED Torch
12V Halogen Dimmer
Automotive LED Timing Light
Economical Desk Lamp For Camping
El-Cheapo Fluoro Ballast
Exit Sign With Battery Protection
Stroboscope Uses White LEDs
Courtesy Light Extender
Model Theatre Lighting Dimmer
Using AC for LED Christmas Lights
LED Lighting For Dual-Filament Lamps
Constant Current LED Drive
Automatic White-LED Garden Light
Interactive Toy Traffic Lights
Traffic Lights For Model Cars Or Model Railways
Neon Flasher Runs From 3V Supply
LED Torch Uses Blocking Oscillator
Grand Prix Starting Lights
Halogen Lamp Dimmer With Soft Start
Thrifty LED Protector
Driver For 20 LEDs
Multicolor HD LED
Automatic Light Controller Using 7806
LED Phototherapy Unit
Using LED As A Light Sensor
Slave Flash Trigger
Ultra Bright LED Lamp
Portable Lamp Flasher
One Of Nine Sequencer
12V Dimmer
Fully Automatic Emergency Light
Solar Lamp Using PR4403
Slave Flash Trigger
Put That Light Out
High-intensity LED Warning Flasher
Smooth Flasher
The Itsy-Bitsy USB Lamp
Midnight Security Light Circuit Schematic
IC Controlled Emergency Light With Charger
Electronic Candle Blow Out
Flashing-LED Battery-Status Indicator
Fading LEDs
Dancing LEDs
Bicycle Back Safety Light
Automatic Low-Power Emergency Light
Two Flashing LEDs
Mains Operated LED
AC 220 Volts Flashing Lamps
Brightness Controller For Small Lamps and LEDs
LED or Lamp Pulsar Circuit
LED or Lamp Flasher
Emergency Light and Alarm
Two-LED Pilot Light
Flashing Eyes
Dark Activated LED or Lamp Flasher
Battery Powered Night Lamp
Courtesy Light
Dark Activated Terrace Lamp

MCU - Microcontroller

PIC Controlled Relay Driver
LCD Module in 4-bit Mode
AVR Dongle
USB-Powered PIC Programmer
Programming The Propeller IC
Contrast Control for LCDs
Simple Universal PIC Programmer
Intelligent Presence Simulator
The Gentle Touch
Multitasking Pins
DCF77 Preamplifier

Microphone

Electronic Ear for Lego RCX Module
Low-Noise Microphone Amplifier (OP270E)
Compressor For Electret Microphone
Speech Eroder
Room Recorder
Spy Ear
Clap Sensitive On-Off Relay
Hearing Aid
A Low Cost Hearing Aid
Amplified Ear

Motor Control

Power (Mains)

Non-Contact Power Monitor
Contact-less AC Mains Voltage Detector
Supply Voltage Monitor
Electrical Isolation For I2C Bus
Simple Electrification Unit
Mains Pulser
Power Flip-Flop Using A Triac
Mains Voltage Monitor
Mains Manager
Mains Slave Switcher II
Mains Slave Switcher
Mains Frequency Monitor
Smart Trailing Socket
Fuse Saver
Mini High-Voltage Generator

Power Supply

Dual Polarity Unregulated PSU For High-End Audio Amps
High Voltage Converter: 90V From 1.5V
Very Low Dropout Adjustable Breadboard Power Supply
3V Supply Splitter
Transformer-less Power Supply
Discrete Voltage Regulator
Simple Pre-Regulator
Dual Power Supply For Amplifiers
Switching Voltage Regulator
Low Power 12V Transformer-less Power Supply
High Input Voltage Linear Regulator
ATX Power Switch Substitute
Compact Switching Step-Down Converter By MAX639
DC/DC Converter From +1.5V To +34V
Dual Polarity 5 Volt Converter Using LM2685
9V DC Adapter With Battery Backup
3 Volts Car Adapter Using LT1074CT
Adjustable 3 Ampere Regulator
78xx Voltage Regulators
12V Glow Plug Converter
DC Control for Triacs
DMM Fuse Protector
Over-voltage Protection
Floating 9V Supply For DVM Modules
RS232 Voltage Regulator
555 DC/DC Converter
Low-Power Voltage Reference
Switch-Mode Power Supply
Low-Drop 5V Regulator
Thrifty Voltage Regulator
Ultra Low-Power 5V Regulator
Soft Start For Switching Power Supply
Alarm Power Supply
Fast Electronic Fuse
Logic PSU With Over-Voltage Protection
Polarity Reverser
Lead-Acid-Battery Regulator For Solar Panel Systems
Fast Voltage-Driven Current Source
Variable PSU
Reset from Multiple Power Supplies
Voltage Regulator Calculation
Reverse Polarity Protector
7.2V Battery Replacement Power Supply For Camcorders
Power Supply For USB Devices
5V Power Supply For On-Train Radio Camera
Negative Auxiliary Voltage
Stable Filament Supply
Voltage Levels Control Relays
Triple Power Supply
SMPSU With A Relay
Inductor-less 3-5 Volts Converter
Buck-Boost Voltage Converter
Adjustable Zener Diode
3.3 V or 5 V Direct from the Mains
100V Regulators
Fully Adjustable Power Supply
Battery Replacement Power Supply
Switch-mode Constant Current Source
Ultra Low Drop Linear Voltage Regulator
Short Circuit Protection For Balanced Supply Rails
Low-Cost Dual Power Supply
High Current Low-Dropout Voltage Regulator
Cheap Switch-Mode DC-DC Converter
8V DC Power Supply With Over-Voltage Protection
Low-Loss Step Down Converter
High-Voltage Regulator With Short Circuit Protection
Alternative Halogen Power Supply
Quad Power Supply For Hybrid Amplifier
Power MOS-FET Bridge Rectifier
Transformer-less 5 Volt Power Supply
Adjustable Current Limit For Dual Power Supply
Step-Down Converter Controlle
Stabilized Power Supply With Short-Circuit Indication
Protection For Voltage Regulators
Solar Cell Voltage Regulator
Low Voltage Step-Down Converter
48V Phantom (Microphone) Power Supply
12V Regulated Inverter Supply
9 Volt 2 Ampere DC Power Supply
3-30V 3A Adjustable Regulated DC Power Supply
Adjustable 1.3-22V Regulated Power Supply
5V Regulated Power Supply
1.5 - 35 Volt DC Regulated Power Supply
Ampere or Current Booster
Discrete Virtual Ground
Stabilized Regulated Power Suppl
Dual-rail Variable DC Power Supply
Dual Opamp Buffered Power Supply
Variable Dc Power Supply

Pulse and Frequency

Pulse Generator
1kH Synthetic Inductor
Frequency Doubler
1.2GHz VCO With Linear Modulation
Pulse Frequency Modulator
CMOS Crystal Frequency Multiplier
Optical Pulse Generator
Long-Interval Pulse Generator

RF (Radio)

Relay

Solar Relay
Reducing Relay Power Consumption
Audio Amplifier Output Relay Delay
Pushbutton Relay Selector
Relay Coil Energy Saver
Handy Time Delay With Relay Output
Momentary Switch Teamed With Latching Relay
Water Pump Relay Controller
Relay Toggle Switch

Sensors and Detectors

Speakers and Subwoofers

Crowbar Speaker Protection
Crossover For Subwoofer
Loudspeaker Protector Monitors Current

Switches

IR On/Off Switch Using Microcontroller
Smart Foot Switch

Time Switch

Telephone and Intercom

Low-Cost Transistorized Intercom
DTMF Receiver IC MT8870 Tester
Cordless Phone Backup
2-Line Intercom-Cum-Telephone Line Changeover
Watch-Dog For Telephones
Telephone Ringer Using Timer ICs
Telephone Call Voice Changer
Telephone Line Indicator
Telephone Free Indicator
Electronic Telephone Ringer
Aviation Intercom
Full-duplex Intercom
Telephone Ringer
Protection For Telephone Line

Test and Measurement

Transistor Tester
Measuring Inductors
High Side Current Measurements
Cheap And Cheerful Transistor Tester
Cable Analyzer
Thyristor Tester
Liquid-Crystal Display (LCD) Tester
Infra-red Remote Control Tester I
Three-State Continuity Tester
Infra-red Remote Control Tester II
Connection Tester
12/24/48 V D.C. Tester
Improved Vibrating Battery Tester
4-20mA Current Loop Tester
Servo Tester Using A 4538
Meter Adaptor With Symmetrical Input
El Cheapo Cable Tester
Four-Channel Oscilloscope Adaptor
Pipe Descaler
Curve Tracer Adaptor
Cable Tester Uses Quad Latch
Frequency Multiplier For LF Measurements
Capacitor Leakage Adaptor For DMM
Internal Resistance Tester For Batteries
Safe Oscillator For Watch Crystals
Simple Cat.5 Network Tester
Cheap AC Current Measurement
Computer Data Cable Tester
Battery Tester For Deaf and Blind Persons
Hyper-Simple Battery Capacity Tester
Harmonic Generator With Single Opamp
IR Remote Control Tester
Low Ohms Adaptor For DMM Based On An LM317 Regulator
Switchable Output Crystal Oscillator
Simple Logic Probe
Minimalist Oscilloscope
A Very Simple LED Tester
Car and Motorcycle Battery
Continuity Tester
LED Tester
Battery Tester
Quick On-Board Junction Tester
Components Voltage Tester
Self-Powered Fast Battery Tester
Circuit Board Checker
220vAC Operated Remote Tester
Infrared Remote Tester III

Tone Control and Preamplifier

Video

VGA to BNC Adapter (Converter)
Video-Out Coupling
RGB To Color Difference Converter
3-Input Video MUX Cable Driver Using LT1399
Video Amplifier
Video Tracer For Trouble-Shooting
NTSC-PAL TV Signal Identifier
Video Isolator

VU Meters

Simple Voltmeter
LED Volt Meter
Linear RF Power Meter
ESR & Low Resistance Test Meter
TV Relative Signal Strength Meter
Electronic Torricelli Barometer
Audio Power Meter
Save Your Ears - A Noise Meter

Miscellaneous

Dimmer Control Voltage Polarity Changer
RMS to DC Converter
Flip-Flop Using CMOS NAND Gates
Electronic Die
Opamp With Hysteresis
PWM Modulator
Cat And Dog Repellent
Reset Sequencer
Discrete Robot
Zero Gain Mod For Non-Inverting Opamp
Simple Under-Voltage Cut-Out
Simple Combination Lock
Logic Probe With Sound
Relative Field Strength Meter For A DMM
Simple 9-Way Cable Identifier
Dual Relay Driver Board

Source: http://www.extremecircuits.net/

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Electronic Projects 4

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