Anyone reading this web page should not assume that any given subject is safe or legal. The purpose here is to give information only. I take no responsibility for what anyone may do with the information given here. What you do with it is your own business and responsibility. Building some of the projects, described here, can be dangerous, illegal or both; and require that the builder or user be very conscientious and able to exercise a great deal of Caution and Common Sense. A project described as "relatively safe" may not be completely safe. It may be described as "relatively safe" only because it appears to be safer than making a batch of Nitroglycerine. Never get cocky where safety is concerned.
POLITICAL CORRECTNESS!!! This page welcomes all varieties of race, gender or anyone interested in its contents. If you are offended by anything that seems politically incorrect, don't write to me. I do not care to be annoyed by fanatic whiners who expect every printed line to pass correct political specifications.
One of my homemade cathode ray tubes is very small. It is 3mm outside diameter. This CRT can fit loosely inside a 1/8 inch hole. Because of the wall thickness, the diameter of the actual screen display is only 1.8 mm (approx .07 inch).
I have also put some videos of my homemade cathode ray tubes on youtube. See Links section below.
Copper Oxide is really neat stuff. It is very easy to make a simple photocell capable of deflecting a volt meter with a small flashlight or listening to audio from a sound modulated light beam. Very Simple Homemade Photocell
It is easy to make a thermistor or pressure sensor by heating a piece of copper wire.Homemade Thermistor and Pressure Sensor
A drop of salt water on some aluminum can produce some very interesting electronic sounds when amplified. Very interesting sounds from a drop of salt water on aluminum.
Do you get more thrust by blowing air out a tube than you would get in the negative direction by sucking the same amount of air into the tube??? I did some experiments and found out a pretty definitive answer. The answer may be surprising to many. Jet Negative Thrust by Sucking???
I have always been fascinated with the old Arc transmitters of the early period of wireless radio. Not to be confused with Spark Gap transmitters, the Arc transmitter was different and was supposed to produce a continuous wave signal that could be sound modulated. What follows is a description of a crude circuit that I built. Simple Arc Transmitter
The coherer was one of the first detectors of radio signals ever used 100 years ago. I tried building one. Getting impressive results turns out to be much easier than I have always thought. Simple Homemade Coherer
Anyone can make an active semiconductor device at home by heating galvanized sheet metal. With it, simple rf and audio oscillators can be built. Amplifiers can also be built. With a carbon microphone or transformer connected, the rf oscillator can even transmit audio to a nearby am radio. Really!! I'm not kidding. Zinc Negative Resistance Oscillator
It is incredibly easy to make a homemade device that behaves similar to a tunnel diode. Using it, a simple rf oscillator was made which could be coaxed into running at 12 mhz. Homemade Tunnel Diode and RF Oscillator.
I made an active semiconductor device at home with Iron Pyrites. With it, a simple continuous wave broadcast band oscillator (transmitter) was built. With a carbon microphone connected, it could even transmit my voice to a nearby am radio. Iron Pyrites Negative Resistance Oscillator
More ways to make a homemade negative resistance devices that are much superior to iron pyrites in ease of use and consistancy. More Negative Resistance Materials.
A simple home made negative resistance audio code practice oscillator that also makes experimenting with negative resistance materials fun and easy without having to use an oscilloscope or curve tracer.Negative Resistance Code Practice Oscillator.
Zinc negative resistance RF amplifier for crystal sets and negative resistance regenerative receivers. Zinc RF Amplifier
I have always wondered if a vacuum tube could operate with a degree of vacuum attainable by amateur means. This is how I broke open a vacuum tube triode and operated it after pumping it down with a vacuum pump. Home Evacuated Vacuum Tube
The next step - an actual homemade vacuum tube diode. Home Made Vacuum Diode
The next step - first attempt at making an actual homemade vacuum tube triode. Home Made Vacuum Triode
Magnetic levitation using permanent magnets. No superconductors, no energy input for stabilization and no spinning tops. Earnshaw - take a hike. Permenant Magnet Levitation.
Magnet Kicker keeps any magnet in motion to make simple motors or "perpetual motion" toys. Magnet Kicker.
Can ordinary propane, such as that used for fuel, be used as a refrigerant? It sure can!! Homebuilt Refrigeration System from hardware store parts.
The next step. Can an old refrigerator operate when charged with ordinary propane? Old Refrigerator Charged With Propane.
Throw staples, tacks, screws etc. like a knife thrower and stick them in the target. Fun and impressive hobby. How to throw staples, tacks, screws etc.
Almost everyone gets a kick from making a good sounding explosion, especially if it can be done with very easy to get materials. Well here is a relatively safe way of doing it with compressed air. Airbang
A "Dry Ice Bomb"??? Who Needs Dry Ice? Airbomb
Simple Static Electricity Generator. The Electrophorus is wimpy, the Wimshurst Machine performs but is much more difficult to build. ThisSimple Static Electricity Generator. is incredibly simple to make and fills in part of the huge performance gap that exists between the Electrophorus and the Wimshurst Machine.
Send sound on a modulated LED light beam. Sound Modulated Light Beam.
Send sound on a modulated Laser Beam. Sound Modulated Laser.
Send sound on a Modulated Flashlight Beam. Sound Modulated Flashlight.
Broadcast a signal through your entire house with a magnetic field. Broadcast with magnetism.
Thirty foot long steel wire makes far out music. Wiremusic.