Homemade Megger Tester (Homemade Hand Crank Insulation Tester) Thomas Kim 2026-09-23 | Homemade Megger Tester (Homemade Hand Crank Insulation Tester)
How to start a fire with a dead lighter & toilet paper Thomas Kim 2023-04-09 | You can start a fire using the flint from a dead lighter and toilet paper.
How to start a fire with a dead lighter & oil marker Thomas Kim 2023-04-08 | You can light a fire using a dead lighter's flint and an oil marker.
How to make a fire with battery and gum wrapper (DC Current measured) Thomas Kim 2023-03-26 | I experimented again with lighting a fire using batteries and chewing gum paper.I did this experiment in 2010.This time, I measured the current using a DC clamp meter from GVDA.The maximum current flows 6.3A.Previous Video : youtube.com/watch?v=F6-E3E8GjkUClamp meter product link :aliexpress.com/item/1005005251839256.html
Homemade Fire Alarm Circuit Thomas Kim 2023-03-17 | I made a fire alarm using a pressure switch extracted from a gas boiler and an Aluminum bottle.The principle is that when a fire breaks out and heat is transferred to the aluminum bottle, the internal pressure rises.There is no standby current, the battery can be used for a long time.#firealarm
Rotating magnetic field in the squirrel cage motor Thomas Kim 2023-02-14 | Rotating magnetic field in the squirrel cage motor
Squirrel cage induction motor experiment Thomas Kim 2023-02-14 | I disassembled the squirrel cage induction motor and rotated aluminum can and coin.The three-phase alternating current generates a rotating magnetic field, which causes the aluminum can to rotate due to eddy currents.
Electrostatic Polarity Detector under AC High voltage transmission line Thomas Kim 2023-01-15 | ! －Getting close to high voltage lines is very Dangerous － !Static electricity is high voltage.The high-voltage transmission tower periodically changes its polarity so Electrostatic Polarity Detector is two LEDs appear to on.In fact, they alternately turn on and off 60 times per second. (60Hz AC)
New Sensitive Electrostatic Polarity Detector Thomas Kim 2023-01-08 | I made a new electrostatic polarity detector. Sensitivity has been improved compared to the previous version.The output from the FDS8958A was amplified using a transistor.Another advantage is that the anode and cathode sensitivities are approximately the same. The previous version had much higher anode sensitivity.#staticelectricity #polarity #howtomake
Triac switching circuit experiment Thomas Kim 2022-12-19 | WARNING: It is dangerous to touch 220V with bare hands.I made several Triac switching circuits and observed its behavior.At DC, it operated like a thyristor.
High voltage Transmission line electrostatic induction (Do Not Try This) Thomas Kim 2022-12-11 | I fixed 50cm steel tray under 765kV transmission line.Small electric spark generated due to electrostatic induction.Do not try this. If you touch power lines, you may be electrocuted and your life will end.#shorts
Tripwire Alarm system using Potential Energy Conversion method Thomas Kim 2022-11-24 | This device generates electricity using potential energy conversion method. Firecrackers can be ignite itself with this device.It can be used as an educational purpose for science subjects related to potential energy conversion.It can also be used as an intrusion alarm or a theft alarm.
How to make a simple tripwire alarm Thomas Kim 2022-11-19 | Let's make a simple trip wire alarm using Copper wire.Firecrackers or buzzers can be connected as needed.0.1mm nichrome wire was used to ignite the fireworks.
How to make 1.5V battery tester Thomas Kim 2022-11-13 | I made 1.5V battery tester made by modifying a DC 300V panel voltmeter.The measured voltage can be changed by changing the series resistance of the voltmeter.For accurate test, load resistor must be connected.(50~100ohm)It can be conveniently used in places where batteries are used in large quantities.
Metallised Film Electroscope Thomas Kim 2022-11-08 | I made an electroscope using a ramen bag.The electroscope is a device that detects static electricity.#scienceexperiment #static_electricity #electroscope
Magnetic field around electric wire Thomas Kim 2022-10-22 | I devised an experimental setup that can observe the magnetic field around a thick wire.Four turns of 100 sq wire, and 5 turns of 60 sq wire on a toroidal transformer.The current is about 1,500A.
How to make a Van de Graaff Generator Thomas Kim 2022-10-14 | I tried to make a Van de Graaff generator using a 220V motor.You can make your own Van de Graaff by watching this video.Materials : 1. Shaded pole motor(220V) - from humidifier - 4mm shaft2. Long plastic cup3. 3mm iron rod4. Silicone tube, 4mm(inner) - 6mm (outer)5. Nyron tube, 8mm(inner) - 10mm(outer)6. Ball bearing, 3mm(inner) - 8mm(outer)7. Electrical Tape (PVC or Vinyl)8. Electric wire (for brush)9. Terminal Block10. 220V power cable (with earth)11. glue stick, gas soldering iron etc.00:04 Van de graaff generator experiment00:31 Flying aluminum foil tray (one by one)00:39 Franklin's Bell experiment00:57 Volta's hailstorm experiment01:21 Discharging residual electrical charge01:27 Van de Graaff generator making start08:31 Van de Graaff generator making finish & experiment start again09:55 Thank you for watching fireworks#VandeGraaff#Static_electricity
Telephone intercom system (Mutual ringing available) Thomas Kim 2022-10-09 | I tried to make an intercom system using two telephones.Use special devices that generate ring signal to make each other's phone ring.It consumes 60mA during the talk time. (24V)
Cooling FAN Wimshurst machine experiment Thomas Kim 2022-08-24 | I made a Wimshurst machine by cutting out a plastic plate and two cooling fans.The cooling fan is for DC 24V, but 12V was used to make it run slowly.Capacitors were made using plastic jam jars, and how to make Leyden jars is in the previous video.youtube.com/watch?v=0BQ6ao00ON0#scienceexperiment #static_electricity
Sonoff Basic modified for 12VDC Thomas Kim 2022-08-21 | I modified the Sonoff Basic to make it for DC 12V.12V load can be switched on and off remotely.I tried to ignite fireworks and it worked.Materials : 1. Sonoff Basic (220V)2. 7805 RegulatorFireworks Firing Device Materials1. UTP Wire (solid wire cable)2. 0.1mm Nichrome wire3. Fireworks* Igniters shown this video cannot be reused.
Jam Jar Leyden Jar (Homemade Capacitor) Thomas Kim 2022-08-13 | Classic Leyden jar made of Jam jar and metal tape.It can charge voltages above 30kV.Capacitance = about 400pF#leydenjar#static_electricity #scienceexperiment #scienceexperimentforhighschool
How to check Solenoid valve works (Solenoid Checker) Thomas Kim 2022-06-19 | This device makes it possible to quickly determine whether the coil of the solenoid valve is normal or not.Where a large number of solenoid valves are used, a faulty solenoid valve must be found quickly.It can be usefully used in chemical plants or power plants.
Homemade Altitude Meter (Barometer) Thomas Kim 2022-05-10 | This is a home made altimeter. It's not exact, but it show you to visually see changes in atmospheric pressure.The level also moves according to the temperature change.
Talking Beluga Whale Thomas Kim 2022-04-27 | White Beluga Whale is trying to talk in a aquarium.#shorts
DIY Tool for ELCB Trip Test (Circuit Breaker Finder) Thomas Kim 2022-04-17 | How to find out which of several circuit breakers supplies power to a specific load.I made a tester using a 6.8k ohm resistor and switch, a neon lamp for this.It can generate a leakage current of 30mA at AC 220V.When applied to 120V GFCI, leakage current is 15mA.Materials : Plastic Bottle6.8k ohm 2W Resistor150k ohm 1/4W ResistorNeon LampPush Switch(Normally Open)Alligator Clips
Science experiments with Liquid Butane Gas Thomas Kim 2022-04-10 | Butane gas boiling point is -1℃.Therefore, at a temperature lower than -1°C, it is in a liquid state.The butane gas boiling point depends on the pressure.I tried some interesting experiments using liquid butane gas.
Homemade BLDC Motor Driver Circuit Experiment Thomas Kim 2022-03-16 | I got a BLDC motor from an abandoned air purifier a few days ago.So, I made a simple BLDC Motor driver circuit and tested it.This BLDC motor is also a DC generator.00:00 Introduce Homemade BLDC motor driver circuit00:46 Running BLDC motor using Homemade Driver circuit01:39 Measure terminal voltage02:35 Discharge residual electrical charge02:46 BLDC motor Generator experiment03:37 BLDC motor mobile phone charger experiment
How to remove security tag (with magnets) Thomas Kim 2022-01-27 | The security tag can be easily removed with a neodymium magnets.Do not use in illegal purpose.
DIY Ceiling LED Lamp Replacement Tool (Unique tool) Thomas Kim 2022-01-15 | This video shows how to change bad ceiling LED light bulb without a ladder.Smart way to change bad light bulbsMaterials : Plastic bottle, fire torch, long rod#recycle plastic bottles
Electric current magnetic effect Thomas Kim 2021-12-12 | I put a neodymium magnet in a plastic bottle and brought it close to electric wire carrying current of 300A.#shorts #electric #magnetism
Homemade Electric Balloon Inflator (Balloon Blower from vacuum cleaner) Thomas Kim 2021-12-10 | I made a DIY balloon inflator using a vacuum cleaner.It is more powerful than commercially available electric balloon inflator.WARNING! : This handcraft uses AC220V. Do not try this at home if you do not have sufficient knowledge of electricity.
How to catch a fly without killing. feat. Laser Pointer Thomas Kim 2021-12-01 | How to catch a fly without killing. feat. Laser PointerStep 1. Blind the fly's eye using laser pointer.Step 2. Catch the fly using a bottle before dark adaptationAdaptation (eye) : en.wikipedia.org/wiki/Adaptation_(eye)#shorts #laser pointer
How to make a fire using cling wrap and water Thomas Kim 2021-10-29 | How to make a fire using cling wrap and water #shorts
Plastic Bottle Launcher Thomas Kim 2021-10-23 | This is a butane gas powered bottle launcher.The combustion formula of butane gas is C4H10 + 6.5O2 = 4CO2 + 5H2OButane : Oxygen Volume ratio = 1 : 6.5The air is contain 20% of O2.Butane : Air = 1 : (6.5 ÷ 0.2) = 1 : 32.53% of butane gas in the butane gas combustion chamber is suitable.500mL × 0.03 = 15mL
Simple ON delay timer circuit (3~5 Sec) Thomas Kim 2021-08-21 | This video introduces a simple delay timer circuit.It can be used to prevent inrush current in large lighting control circuit or rectifier circuit.
Homemade Newtons cradle Thomas Kim 2021-03-27 | I made Newton's cradle using discarded ball bearing.6320C3 bearing has 8 iron balls measuring 36.5mm.00:00 Newton's cradle demonstration01:14 Ball bearing disassembly03:30 Spot welding iron balls05:00 Newton's cradle demonstration again
Positive & Negative Van de graaff Generator Thomas Kim 2021-03-11 | I found good materials to make the Van de Graaff.[Positive Van de Graaff] Top roller(Dome) : Nylon tubeBelt : PVC tapeBottom roller(Ground) : Silicone tube[Negative Van de Graaff] Top roller(Dome) : Silicone tubeBelt : PVC tapeBottom roller(Ground) : Nylon tube00:00 - Negative & Positive Van de graaff generator body00:35 - Van de graaff connection & Polarity test01:02 - Van de graaff operation & spark test02:14 - Franklin bell experiment02:48 - Electrostatic motor experiment03:50 - Aluminum Plates on a Van de graaff04:19 - Leyden jar charging & Discharging04:48 - Van de graaff polarity test05:15 - Thank you for watching fire letter
How to break The Electric kettle secretly Thomas Kim 2021-02-26 | Electric kettles are used in alternating current. What if I apply DC voltage?DC voltage has no zero crossing point, the arc hardly disappear.So the switch will be damaged.But there is no change in appearance.
How to test Non-contact voltage testers without AC Main power Thomas Kim 2021-02-06 | This video shows how to test Non-contact voltage testers using 220V AC synchronous motor.This type of motor can be found in microwave turntable motor.Non-contact voltage testers work by sensing a very small amount of current that is capacitively coupled from the live circuit to the tester and back to ground. Non-contact voltage testers light up when they detect this current without needing to make direct contact. A built-in sensor at the tip of the tester detects the presence of voltage when touching a conductor, outlet, or supply cord. By holding the tool, you are the ground reference through capacitive coupling. When the tip glows red and the unit beeps, you know voltage is present.When one pole of microwave turntable motor touches the human body, it becomes grounded, and the other wire generates a voltage to the ground.220v ac synchronous motor(from microwave turntable motor) can generates 350V AC voltage & 2mA current. So, you can test non-contact voltage testers using microwave turntable motor.This type testers can detect only AC voltage. If the unknown voltage is DC high voltage, it cannot be detected.
Electric Wire Magnetic Field Experiment Thomas Kim 2021-01-01 | Electric current produces a magnetic field. A small magnet can be used to detect the magnetic field. (Only AC current)#toroidal transformer
How to test your carbon monoxide detector Thomas Kim 2020-12-25 | Disposable hand heaters are useful in winter.However, since this product uses activated carbon, carbon monoxide and carbon dioxide are released.Both gases are harmful to the human body, so care should be taken when using them in confined spaces.#carbon monoxide#carbon monoxide detector
Homemade Dog Repeller = Fail Thomas Kim 2020-11-21 | I made a dog-repeller device using 30kV high voltage generator.It does not work for some breeds.
How to test an IGBT without multimeter Thomas Kim 2020-09-15 | I tested the health of several IGBTs. Be careful of static electricity when using this method. Because IGBTs are easily damaged by static electricity. So, Touch first battery terminal.H30R1202 : 1,200V - 30A IGBTMG50Q1BS11 : 1,200V - 50A IGBTMG150Q2YS1 : 1,200V - 150A IGBT block
DC ARC Experiment Thomas Kim 2020-06-21 | This experiment is dangerous, so DO NOT TRY THIS AT HOME.The tig welding device uses a DC arc phenomenon. In the old days, carbon arc lamps were used as lighting. Solar power plant junction boxes are prone to fire due to DC arcing.
How to make a CPU FAN Generator Thomas Kim 2020-04-15 | This is homemade CPU FAN Generator.The cooling fan can be switched to a wind power generator.Materials : 1. CPU FAN2. 1N5819 Diode 4EA3. Electrolytic capacitor 16V 220㎌4. Chip LED
How to test Carbon Monoxide Detector (Actual Test) Thomas Kim 2020-04-04 | When combustion occurs at a low temperature(or lack of Oxygen), incomplete combustion produces carbon monoxide.It is toxic to animals that use hemoglobin as an oxygen carrier (both invertebrate and vertebrate) when encountered in concentrations above about 35 ppm.In the United States, the OSHA limits long-term workplace exposure levels above 50 ppm.
Fire Off Alarm (Run out of fuel alarm) Thomas Kim 2020-03-08 | This is a Fire-off alarm circuit using thermocouple for gas burner.The alarm can be triggered when the portable gas burner runs out of fuel.
Butane Gas Explosion Chamber Thomas Kim 2020-02-10 | Do not try this at home without adult supervision.This is homemade Butane Gas Explosion Chamber. You can demonstrate Danger of butane gas explosion with this device.
How to test magnet polarity using DC clamp meter Thomas Kim 2019-12-15 | DC clamp meters work on the principle of the Hall Effect. Hall effect sensors sense the magnetic field caused by current flow which causes a small voltage across the Hall effect sensor. That voltage, which is proportional to current is then amplified and measured.The DC Clamp meter can also be used to check the polarity of a magnet.
How to check SMD LED light panel using DC motor Thomas Kim 2019-11-03 | DC motors can be used as DC generators.This video shows you how to check the LED light panel using a DC 110V motor.In addition, it can be used to check small light bulbs and LEDs.
How to find a bad bulb in series connected bulbs Thomas Kim 2019-10-04 | Non-contact voltage detectors make it easy to find broken parts in series circuits. (ex. Christmas tree string light)In this video, twenty of 12V car bulbs connected in series and powered by AC 220V main voltage.Quickly find a failed bulb using a non-contact detector.Warning!Non-contact voltage detector is only working AC voltage. So, can not detect DC Voltage. Do not judge the risk with a non-contact detector alone.
