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IC Datasheet catalog
Article in electronics
Simple version. Full version located here
LED boost switcher - Single AA cell powers two LEDs at constant current
LED buck PFM - Powers LED with constant current starting at 100mV over Vf
Constant Brightness LED Stroboscope - For measuring the speed of small motors
Stud Sensor Automatic - This is the old discrete component design, now superceded by a PIC.
Unusual Radar Detector - This unique anchient design uses a chopper amplifier
Flashlight Timers - Children's flashlights often have timers to preserve battery life
Ultrasonic Pest Repeller - These emit noise to confuse or agitate insects or animals
Photo Flashes at 1.5 volts
Sound Activated Toys
Wall Clock Governor Drivers - These were common before the advent of quartz controlled stepping motor clocks.
Tiny RC Cars TX and Charger
Simple RC Cars - Single channel Transmitters and Super Regenerative Receivers at 27MHz and 49MHz
Four/Five Channel RC Cars - TX and RX circuits using metal gate CMOS instead of custom chips.
Bathroom Deoderizer Control - That box you see on the wall in public washrooms. This is the type that has a little DC motor fan positioned above a small container containing a deoderant liquid or jelly, and runs off a D cell. The photocell turns off the fan when it gets dark. The LED flashes if the battery is good.
Ceiling Fan Speed Control - For one of those 3 or 4 blade decorative fans.
Color Organ Light - Flashes coloured christmas type lightbulbs to music. This circuit works REALLY well. Notice how it will fire even in complete silence. This provides a sort of automatic gain control.
Delayed Off Light Switch - Rated for use with incadescent loads. This is an unusual design in that it uses plain metal gate CMOS logic instead of the usual PIC or a custom chip. The 22uF capacitor charges up during one half of the ac cycle, and supplies trigger current to the triac on both halves.
Deoderizer Fan Pushbutton Timer - A battery operated fan blows air accross a stinky pad. For use in a bathroom or car. I've seen similar circuits used in plastic pot-pourri containers.
Digital Timer Light Switch
Hand Clap Lamp Control
Radio Controlled 3way Light Switch
Air Ionizer (Negative ion Generator)
8 Relay module
Baby Watch out
Electronic selector for 10 sources with Display 7-segment
Electronic selection for 8 sources
Electronic selection for 8 sourses with 2 push buttton [Up/Down]
Electronic On/Off Touch Switch
Voltage window switch
Temperature window switch
Signal and Tone Activated Relay Switch
Over and under voltage switch with relay
Electronic Touch Dimmer
Light sensitive and differedial temperature switch
Digital ping - pong 
Digital ping-pong 
Acoustic Tone by command
Digital Roulette with Display
Melody Door Ringer
Timer with Buzzer and Optocupler
Wide rage auto turn OFF timer
Relay timer switch
Digital Clock with MM5314N
SamClock RINGER and drive external load
SamClock [Digital Clock]
SamGordon Digital Clock
Bachelor project. Computerised house control. Room control. Wide physical dimension measuring range (temperature measuring range from –10 to +50 0C, light intensity measuring range from dark to high brightness)
A frequency meter metal detector. We have designed the metal detector, the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). Our device has a simple design and one has the quite good characteristics.
Electronic relay (simple)
Long delay timer (simple)
220V mains monitor. With this circuit you will be able to monitor the quality of the mains. (simple)
Basic infrared TX-RX (IR) (simple)
ElectronicI Ching. This circuit is the electronic emulation of the I Ching, a form of divination originating in China. (simple)
Sound triggered flash. If you wish to take a picture of a fleeting event which generates a sound, you can do it with this sound activated trigger. (simple)
Whistle Switch. Remote control by whistling. Turn appliances off and on.
Bootstrp/ PLL ( Phase Locked Loop) (Metal detector theory) (33 Kb)
Cheesemd2 (Metal detector theory-BFO) part2 (328Kb)
Cheesemd1 (Metal detector theory-BFO) part1 (181 Kb)
Aircore (Metal detector theory) (162 Kb)
Metal Detector Description James Trevelyan (Metal detector theory)
BFO Theory (Metal detector theory) (59 Kb)
1.5 Volt Strobo with a Kodak Max Disposable Camera. How to modify a Kodak Max Disposable Camera Flash Circuit and build a 1.5 volt supply STROBO. (Yes! just using a 1.5 volt AA alkaline battery!!)
Underground Radio - How to use conductive soil (underground water table) to transmit audio or radio signals. During World War II there were situations were conventional radio was useless, either because enemy jamming or just for hidding purpouses; thus, radio operators forced off the air, tried a different aproach... underground radio. Although it's obviously a less efficient system, it works perfectly well if we find a good conductive sheet beneath.
Infra Red Vision System for a Toy Car
Rechargeable Led Flashlight. This is the project of rechargeable flashlight using a high intensity red Jumbo Led. The main idea is to have a moderate source of light that will be ever at hand, without batteries to replace or light bulbs to change. It may be left plugged in the 110 vac wall outlet, ready for use.
Infrared gate 2. This is an infrared gate with two sensors planned to use in the wall in the way behind a door.
220V live wire-in-wall scanner
Full-duplex doorphone with 3 wires connection.
(RF) remote control encoder/decoder (PIC projects)
Automatic door opener (PIC projects)
Relay delay circuit
Latching relay driver
Transistor relay driver
Strain gauge sensor
Solar power supply
Programmable light relay
Negative ion generator
LED Christmas lights
Time delay circuit
Switch on delay circuit
Morse practice oscillator
Solar power battery charger
General IR receiver
Three channel "snap"
Ultrasonic motion detector
Long period timer
Solar sun tracker
Air flow detector
Low frequency clock
Mega phone circuit 9v
Microwave Oven Transformers- Power (XFMR's)- Tesla Coil (includes A Typical Microwave Oven Schematic)
Dynamic lights (12C508A) (Christmas)
Wall Wart Information
Nifty Original Ideas: / Test Probes Too Big? / Wristwatch Hell / Phone Line Indicator
Watch on PIC.
Low drop linear voltage regulators (article from National Semiconductors)
IBM PC joystick
Soft Musical Telephone Ringer
Infrared Remote Control
Digital Switching System
Precision 1Hz Clock Generator using Chip-on-Board
Electronic Scoring Game
Ultra Low Drop Linear Regulator
High and Low Voltage Cutout with Delay and Melody
Automatic Room Power Control
Auto Reset Over/Under Voltage Cut-Out
IC Controlled Emergency Light with Charger
Wiper Speed Controller
PROGRAMMABLE MUSICAL BELL
SOLIDATE RELAY WITH UNDER/OVER VOLTAGE PROTECTION
Phase Failure Relay
Variable Frequency Ultrasonic Pest Repeller
Radio Controlled Remote Control
Soft-touch Bi-directional Motor Driver
LOW COST AUTOMATIC GATE LIGHT WITH A MUSICAL BELL
READY-TO -USE OBJECT COUNTER
AUTOMATIC TEMPERATURE CONTROLLER
WATER LEVEL CONTROLLER USING 3-PHASE STARTER
SOFT MUSICAL TELEPHONE RINGER
PROGRAMMBLE PRIORITY TIME SWITCH
Simple Intercom Circuit
Ramp Controlled Light
IR Remote Control
Accurate Electronic Stop-Watch
Programmable door-bell with flashing LEDs
Sensitive Temperature Switch
Single-ic Decoy Switch
Touch-Sensitive Musical Bell with Timer
Magic Wand Conjuring Trick
Hot Water Tank Indicator
ConjuringTrick- "Domino Box"
Sound Operated Switch
Electronic Night Light
Digital Combination Lock
Doorbell with Counter
Remote Doorbell Indicator
Press Button Switch Debouncer
DC Push Button Motor Control Circuit
Light Detector Circuit
Dark Activated Switch or Porch Light Switch
Frost Alarm or Cold Activated Switch
Infra Red Remote Control Extender (IR)
Backup Lamp (11k) Don't get caught in the dark again!
Dome Lamp Dimmer (16k) Efficiently dim the car's dome or map light.
Battery Saver (161k) Automatically turns off flashlights, toys and other devices operating on voltage as low as 3 volts.
Five projects for April Fools Day! (77k) Build a mysterious lamp, maddening dripper, TV remote control blocker, rattle box, and a truly smelly project.
Shower Stopper (24k) By request! This gadget throws cold water on long showers.
Deer Repellent (18k) This seismic sensor can detect and frighten away intruders.
Fridge Alarm (9k) Alerts you when the refrigerator door is left open.
Galloping Neons (20k) Build a line-powered array of blinking neon lamps.
TV Scavenger Hunt Game A "game show timer" is at the heart of this fun TV watching game.
Rain Detector (15k) Stick this out the window instead of your hand. Weather Circuits.
Timed Beeper. Beeps for 7.5 seconds after a presetted time. Adjustable time settings: 15 sec 30 sec 1 min 2 min and others
Plants Watering Watcher. Varying brightness LED signals the necessity to water a plant. Very low consumption, 3V
Fridge door Alarm. Beeps if you left open the door over 20 seconds. 3V battery operation, simple circuitry
Bedside Lamp Timer. 30 minutes operation. Blinking LED signals 6 last minutes before turn-off
Headlight Reminder Circuit
Cheap 40KHz clock
Control 120VAC relay with TTL
Garage Door Opener Scanner
Clock Divider Circuit
A Clock Doubling Circuit (500KHz) for CMOS logic
The microwave oven
Power-Off Time Delay Relay Circuit
Touch Activated Lamp
9 Second Digital Readout Timer
9 Second LED Relay Timer
28 LED Clock Timer
Electronic Thermostat Relay Circuit
Time Delay Relay Circuit
Light Activated Relay
Generating Long Time Delays
Time Delay Relay II
Pine Racecar Victory Judge
Computerize Your Room/Home
Time Delay Relay
Robot wars: start here!
Touch operated changeover switch
Timer: pulse output
Timer: delay on energise
Timer: delay on de-energise
Thermometer and thermostat for Room temperatures
Domestic heating control circuit
5 to 30 minute Timer
555 Monostable Circuit
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