Miscellaneous schematics

· 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

· How to generate a Rotating Field

· Chaos generator

· Simple BFO metal detector

· Voltage Comparator Information And Circuits

· Electromagnetic Levitator

· Build Your Own Digital Setting Circles For Your Astronomical Telescope

· PL tone generator (NE567)

· Bat detector

· Bat detector microphone pre-amplifiers

· DGPS receiver

· 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

· Nocturnal animals whisker

· 12V DC electronic door chime

· Biasing Op-Amps into Class A

· Parasite zapper

· Analog computer

· BayComm packet modem

· Morse monitor

· HamComm modem interface

· Morse paddle keyer

· UV light box

· Voice activated tape recorder switch

· 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

· Pulse pperated Ni-Cd battery zapper

· Garmin GPS data interconnect

· Inexpensive APRS Weather Station

· Walking robot

· Vibrating Pocket Bug Detector

· 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

· Jacob's Ladder

· 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

· Schmidt Trigger

· 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)

· No loss capacitor

· Discrete logic decimal to BCD converter

· Doorbell extender

· Earthquake detector

· Electromagnetic levitator

· Jacob's ladder

· Magnetic ball levitator

· Photodiode amplifier

· Relative wind angle indicator

· Solid-stateTesla coil

· Very basic circuits

· Bat detector

· FCTS Project

· Smooth Tone Clickless CW Sidetone Generator

· Morse Code Beacon Keyer

· Lightning Activated Camera Shutter Trigger

· Three Power Supplies for the Garmin GPS-20 Sensor Board

· Driving N-channel FETs from TTL

· Miniature Self-Powered Autonomous Robot

· Electronic Dazer

· 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")

· Voltage follower with 1G ohm input (LM11)

· Double-ended flashing voltage monitor - LM10

· Morse code display

· Intercom schematic

· Pulse Induction Metal Detector

· Scaling ADXL50 accelerometer output