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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.
Modified Howland Current Source. A Constant Current Source for a Grounded Load using a Single Op-Amp. (Theory)
Bartlett's Bisection Theorem. Modify passive filters for unequal terminations. (Theory)
A mini-tutorial on HP's Advanced Design System software (ADS)
Nothing box. Nine neon relaxation oscillators do nothing but blink continuously for five years on a single set of batteries.
Service manual Panasonic tc-29v50r
Programmator turbo v3.36.20. soft
Picprog
Phtorism with 12Volt
Automatic Dual-output Display
Wiper Speed Controller
Radio Controlled Remote Control
Soft-touch Bi-directional Motor Driver
READY-TO -USE OBJECT COUNTER
LOW-COST TRANSISTORISED INVERTER
Economical Pump Controller
Tank Overflow Preventer
Flashing Brakelight
Up/Down Pulse Separator
Intelligent switch
Clap Switch
Designing Transistor biasing Circuits Using QBasic
Single-ic Decoy Switch
Magic Wand Conjuring Trick
Hot Water Tank Indicator
Static Electricity / Negative Ion Detector
ConjuringTrick- "Domino Box"
Press Button Switch Debouncer
DC Push Button Motor Control Circuit
Satellite Supplies (Hardware)
Pic24C programmer. Pic 16C/F84 ,24Cxx and 12C508 Combi programmer. Full mouse support, user friendly interface with pulldown menu, HEX save, Bin save, all popular programming interfaces supported PicBust option
Stepper Motor Experiments
Five projects for April Fools Day! (77k) Build a mysterious lamp, maddening dripper, TV remote control blocker, rattle box, and a truly smelly project.
24 Line Parallel Interface for the PC (15k) - only schematic
Unusual Frequency Dividers (35k)
Switching Diode Frequency Doublers (66k)
Waveform Conversion Sine to Square/Square to Sine
Reducing Vibration Induced Phase Noise - Some Research Ideas
Vibration-Induced Phase Noise and Vibration Isolation (includes links to spreadsheets for vibration calculations)
PLLs using ULN Oscillators
Phase Locking and Tuning
Two Diode Odd-Order Multiplier
Morse Code Beacon Keyer
Time Delay Relay II
Pine Racecar Victory Judge
Robot wars: start here!
Ultrasonic Intruder detector
Barry's Magnetic Levitation. Magnetic levitator. The pages include complete design details for an antigravity relay to levitate small iron parts.
Barry's Coilgun Mark II (coil gun)
Barry's Coilgun Mark I (coil gun)
Peltier coolers/heaters
Ground loops
Phase shifter circuit
Quiz-Show Indicator
Infra Red Remote Transponder
Build an Infrared night scope
Circuit for a Critter Ridder
How to generate random numbers
Squarewave to Sine circuit
Introduction to Tesla Coils - Postscript
Frequency Dependant Negative Resistor (Using Opamps)
Op amp circuit #1- Basic inverting and non-inverting circuits.
Op amp circuit #2- Simple op amp differential amplifier ("balanced" input).
Op amp circuit #4- Simple 4-input mixer stage.
Op amp circuit #5- Single supply op amp circuit.
Op amp circuit
Simple Discrete Op amp- made with common transistors
Solar Panel Charge Controller Circuit
Constant Temperature Circuit
Pulse Width Modulation DC Motor Control
Stepper Motor Controller
Simple Lie Detector
Understanding Electricity - an analogy with water
Ultrasonic Transmitter
Ultrasonic Receiver
Ultrasonic Preamp with Twin-T tuning
Ultrasonic Preamp with AGC
Twin-T tuned Ultrasonic Preamp
Switch, Touch operated
Resistor colour code
Relay driver, transistorised
PUT pair: 2 Tr equivalent to SCRs, SCSs and other 4 layer devices
Pump and hold (staircase)
Programmable Unijunction Transistor
Preamplifiers, ultrasonic
Multipliers (3n3 etc) for resistors and capacitors
Latch, Data bidirectional
Industrial process control circuits
Game referee circuit for snap & musical chairs
Data switch and indicator, bidirectional
Current sensing relay driver
Cup and bucket charge pump
Component values and colour code
Comparator with controlled hysteresis
Analogue "counter"
Simple IR detector
Transistor, Diode, IC outlines
Ultrasonic radar
Electronic fish lure
Ultrasonic sound receiver
Experimental data transmitter for fiber optics
Experimental fiber optic receiver
Ion detector
Darkness monitor
Electroscope
Simple event counter
Geiger counter
Light detector
Short-circuit beeper
LM 1800 FM stereo decoder
Glitch detector
MAX924 bar-graph level gauge
Ultrasonic generator
Negative ion generator
ELF Monitor
Chaos generator
Simple BFO metal detector
Voltage Comparator Information And Circuits
Build Your Own Digital Setting Circles For Your Astronomical Telescope
PL tone generator (NE567)
Bat detector
Bat detector microphone pre-amplifiers
Full-duplex doorphone with 3 wires connection
G Strain energy absorber
RDS Encoder
Toggle Switch Debounced Pushbutton
RDS Encoder
Discrete Set/Reset Flip Flop
Monostable Flip Flops (one shot)
Discrete Bistable Flip Flop
Talking Morse Code Practice Computer
Plant watering watcher
Capacitance sensor
Whistle responder
Biasing Op-Amps into Class A
Parasite zapper
Analog computer
BayComm packet modem
Morse monitor
HamComm modem interface
Morse paddle keyer
UV light box
Random noise generator
Analog pulse counter
Analog opto-isolator
Pulse width modulators (PWM)
Pulse width to voltage converter
Fantastic Atom Expander
Black Light
Computerize Your Room/Home
Flash slave trigger
A Visual CW Zero Beating Aid
A two-way Morse practice set
Magnetic levitation device
Tesla power receiver
Lazer Tag Equipment Modifications
Garmin GPS data interconnect
Inexpensive APRS Weather Station
Walking robot
Basic op-amp circuits
Power line FM intercom
Intercom circuit
Lightning Storm Detector
Large LCD Display Buffering Driver
Text to speech converter
Ion detector
1uS light pulse descriminator plus F to V converter (PDF)
Broadband 2MHz optical fiber receiver (PDF)
Modulated light received (PDF)
1uS light pulse receiver plus post amp (MISC)
Broadband 5MHz optical fiber receiver (PDF)
High-speed light receiver (PDF)
Basement doorbell beeper (PDF)
Time to dust indicator (PDF)
Low-power optical interrupter (PDF)
Simple nitrogen spark generator (PDF)
Ultrasonic transducer oscillator circuit
Build logic gates using discrete parts
Sudden Ionospheric Disturbance (SID) Receiver
A selection of robotics projects
Bat detector (new)
Vat detector (old)
Variety of quick designs
Gold wafer (smartcard) programmer
Making a FRED photopopper
Griffith Observatory Tesla Coil
Fogger smoke machine
Dinsmore 1490 digital compass
Geiger counter
Electric field disturbance monitor
Inexpensive seismometer project
Digital dial
GPS receiver interface
Doorbell for the Deaf
Electromagnetic field detector
Insect Repellant
High Quality Intercom
Magnetic Gun.
Metal detector
Static Electricity / Negative Ion Detector
Ultrasonic dog whistle
Popular Electronics Ultrasound Detector
An Inexpensive X-ray Machine
Magnetic levitation circuit
PE3342 Programmer Schematic
u-Blox GPS receiver board
Assorted digital circuits
Basic electronic circuits
Miscellaneous simple circuits
Digital Call Sign Annunciator
Ultrasonic switch
Sound finding cricket with phase detector
Sound finding cricket
APRS GPS tracker schematic (PIC16C73)
Very basic circuits
Bat detector
FCTS Project
Smooth Tone Clickless CW Sidetone Generator
Morse Code Beacon Keyer
Lightning Activated Camera Shutter Trigger
Simple metal detector electronic circuit
Three Power Supplies for the Garmin GPS-20 Sensor Board
Driving N-channel FETs from TTL
Miniature Self-Powered Autonomous Robot
Morse Code Practice Keyer 1
Morse Code Practice Keyer 2
741 Light Sensor
Fluid level detector
The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
Morse code display
Intercom schematic
Scaling ADXL50 accelerometer output
Audio Indicator
Combinational Conjuring Trick
Quiz Circuit
Doorbell for the Deaf
Metal Detector
Electromagnetic Field Detector
Negative Ion Detector
Neon Desklamp
High Quality Intercom
Hot Water Indicator
Infra Red Link
Insect Repellant
Laser Communication System
LED Torch
Magic Wand
Miscellaneous Circuits
Speaker Microphone
Temperature Monitor
Ultrasonic Dog Whistle
Perimeter Alarm
Pot Plant Power
Automation Control via X-10
Distributed Control of an Automated Sorting Cell
LCD Emulator / Controller
Radio-controlled Digital Clock
Return of the StoneAge DiskDrive Logo Turtles
Slot Car Racing Performance Display
Stepper Motor Autonomous Control Kit
Teletext Adapter Package
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