High frequency generator

I want to build a VHF (high frequency) powerfull generator for make an unusual form of lightning. It must produce microwaves 10 - 20 mm. length. Please, write here if you have any information about such generator.

Topic by 012345678910   |  last reply


Arduino High Frequency?

I have an Arduino Duemilanove and was wanting to know how and/or what I need to do to create a high frequency signal. I dont have a set frequency in mind but would rather know how to change it so I can gradually step it up until I get desired results.....Have looked at a lot of stuff on google for how to do this and most refer to a wiring.c file but mine appears to be an updated version to what they have...Anyways any help would be greatly appreciated =)?

Question by afreeland   |  last reply


High Frequency Alternators

Look at a picture of some arcs from a common spark-gap Tesla Coil, and then compare it to the arcs from a solid-state. What makes the two so different? The difference comes from the Solid-State Tesla Coil to operate in CW (constant wave) mode. This means that its power supply is uninterrupted, whereas in a spark-gap type, power is being switched on and off hundreds of times per second. If the output terminal of a CW coil doesn't have a brake out point, no corona or spark will occur. For anyone who's investigating wireless power transmission or Tesla's version of radio, this is a very helpful feature, since corona only wastes energy. And if it does have a brake out point, it can create some pretty interesting spark displays, as I mentioned above. An arc to a grounded object increases the current in the arc to such a point that it turns into a white-hot "flaming" discharge. All-in-all, a CW type coil is a pretty interesting kind to observe. But solid-states can be pretty difficult and annoying to build, and expensive as well. Since solid-state technology obviously was not available to Tesla, he found a different way to operate his coils in CW mode- a generator that was specially designed to produce radio-frequency power. He had originally created it for high-frequency arc lighting. Today, I have seen absolutely no coils run by a high frequency alternator. Of course, an alternator would be admittedly difficult to build, but since it could probably deliver more power than a solid-state coil, it would be worth it. Does anyone know if there are any companies that still make these alternators? Would anyone be interested in recreating it? Should we even bother? Thank you for listening. Peace!

Topic by ElectricUmbrella   |  last reply


Audio Detector

Is there some type of electrical component which detects high frequency sounds like those mosquito ring tones? I've looked around and seen things which apparently detect high frequency radio waves, but that isn't really what I want (at least I don't think it is). Thanks in advance.

Topic by brickzima   |  last reply


Thermoacoustic electric generation at high frequency? Answered

The goal: cheap, easy(ish) electricity. The power source: concentrated sunlight or fire. The question: Has anyone here made them self one of these? : a thermoacoustic electric generator which runs at high frequency. I'm not talking about a sterling engine at least not exactly. Rather I'm looking to make something that resonates much faster and could be harnessed with a voicecoil or a piezo electric transducer. This has been done by grad students and researchers but I haven't seen any built by the DIY crowd. There are some startups around who tout this method because it is more efficient than a sterling engine and easier to build because there are essentially no moving parts or sliding seals. The higher frequency seems to be the tipping point in efficiency because there is less gas moving but moving with the same energy: "Minimizing the flow velocity of the gas overcomes viscous losses inside the regenerator, whose tiny pores allow heat to move between gas and solid most efficiently." http://www.americanscientist.org/issues/feature/the-power-of-sound/5 I'm thinking of making something with common materials: a loop of steel pipe and speakers or a bunch of piezo buzzers and a bike tire valve to add compressed air (for higher frequency oscillation). Can anyone lend the voice of experience for us? Here's some reference material: http://www.wired.com/science/discoveries/news/2003/01/57063 http://en.wikipedia.org/wiki/Thermoacoustic_hot_air_engine In greater depth: http://www.americanscientist.org/issues/feature/the-power-of-sound/ http://www.aster-thermoacoustics.com/?page_id=141 Videos: http://science.discovery.com/videos/invention-nation-thermal-acoustics.html http://www.youtube.com/watch?v=Vv0ulNLRkWM And there's a good explanatory video out of Europe but I can't find it now. Key words for 'bots: TAPEC ECN TAP (Thermo Acoustic power) SCORE (Stove for Cooking, Refrigeration and Electricity)

Question by snotty   |  last reply


Variable frequency generator? Answered

I'm looking for a way to build a simple frequency generator that generates high and low frequencies. I was thinking of using a POT to control the frequency range. I looked for it all around but the search didn't help much.

Question by matokage   |  last reply


TV giving off high pitch hum.

Well I recently inherited a old TV it is an SDTV and it is about seven years old. So I decided to test it with my computers osciloscope and using the microphone on it i turned the osciloscope on and there was one constant signal that went up and down about 3 or four KHZ every second or two. But when I muted the TV their was the normal background noise at about 1-7 KHZ but one signal that I found is about 16-17 KHZ and 5.94 DB, and when I turn the TV off it stops and that 16-17 signal disapers. So how do I get rid of this annoying high pitch noise?

Topic by jackillac92   |  last reply


Questions about computer stereos

Hi! I'm building a portable amplifier from old computer-speakers and I have a couple of questions about them. 1. How do I make the stereo-speakers mono the best way? 2. Is it possible to make low- and high-pass filters to a simple amplifier as the computer ones? I thought I'd connect one bigger speaker (a whopping 5" one!) to amplify the low frequencies and one small to amplify the high frequencies. This would work the best with a 1-channel amp. Thank you in advance, hope you understand what I'm looking for! P.S. Please move the thread if it is in the wrong category, wasn't sure if it suited better under "music" or "tech".

Topic by Henell   |  last reply


Electric Lady - High Frequency Power Supply?

I saw an electric lady in a travelling sideshow. The type where she throws sparks from the hands, makes paper  burst into flames and causes bulbs to light by holding them. I'm assuming they are using a high frequency power supply (very low amps), and I was wondering if anyone has built one and if there are any good schematics on line?

Topic by Divet   |  last reply


Help...how to get more sound by ionizing a gas with high frequency?

So i am trying to make a geiger counter (if you don't know what it is...search it) and i'm kinda getting somewhere, but there is a problem. i need to get more sound out of the bulb i'm ionizing, i am ionizing it with very high frequency and low voltage (very low) and i connected it to some speakers that i have (they run on they'r own battery so i need only signal) but its very quite and i need to make it more... louder. So how do i do it? i'm kinda guessing i have to connect the input wire on parallel or in series with some batteries to the bulb so the high freq voltage or current would get up, and i also will put a potentiometer to get it to the stage before ionization so.... yeah thats all......thnx for all answers. (English isn't my first language btw)

Question by onepiece94   |  last reply


Looking for big tansformer cores for high frequency use... Answered

Although I have made more and more progress with my home made ferrite I am not in the need for a big transformer core for testing purposes. Desired frequency range: 30-120kHz Required power: 2kW I looked through endless pages of theoretical science stuff, a lot of useless online listings and thought: Why not do what everyone does instead of using Google and ask my friends here? ;) So far I think an iron powder core might be better in this case than the more traditional ferrite cores due to the power and saturation levels. But what size would I really need so the  whole thing won't saturate or overheat? Ring core or better a pot core?

Question by Downunder35m   |  last reply


variable frequency drive construction?

Hello i am working on a go kart but instead it will be powered by a 1/3 horsepower split phase AC motor. it operates off 768 watts and i am curious in using a Microcontroller and a high power H bridge to control it. can anyone help me or give me an idea on how to step up 12v dc into 120v dc and then using the H bridge to generate the frequency and also where to find some NPN transistors that can handle it and how to possibly reverse the direction of the motor?

Question by luig   |  last reply


A circuit which can find out frequency of high frequency signals?

Alright so I am doing this project and we have to find out the fundamental frequency of any input signal so that we can use that information to select sampling frequency. Can anyone point me in the right direction regarding making a circuit which can measure high frequencies in the order of GHz even?Thanks!

Question by Hussam   |  last reply


How do you build a small High voltage high frequency power supply? Answered

I need the plans/general guidance to build a high voltage/high frequency power supply like the one used here http://www.youtube.com/watch?v=hUQReIW8f1Q&feature=plcp  . He describes it as "A small ignition-coil, driven by a simple NE555-circuit feeds a 2-stage-multiplier. 12kV out...almost no current, but as you see: Enough to start a fire." Im not sure how to build that. 

Question by lug big lug   |  last reply


Frequency driver HV generator circuit Answered

Dear all... At this circuit please help me to know: - How many cycle (frequency)and duty cycle : time high and low  (percent) for  better driver this circuit. Sorry for more question.If I change other transformer (ferrite core)and driver by 555 timer, frequency  and duty cycle must   be modifier or not ?                                      Thank you in advance

Question by lam   |  last reply


How does this CCFL inverter work? Answered

Hello, I have this CCFL (Cold Cathode Fluorescent Light) inverter from a scanner. it powers the scanner light. That's the schematic, but I can't see all the components very good, I'm sure about everything that's noted in the schematic, but I don't know the value of that capacitor between both collectors. It's that brown one from the picture. So the question is: How does this circuit work? I'm still trying to figure out how the transistors switch, it's really weird, because when I try recreating this on my breadbord it doesn't work. And why is the first coil shorted out? What I do know about this is that it has an output voltage (very low current, serveral micro amps) of 2 to 3kV. It also works at a very high frequency, about 30kHz I think, and it has a ferrite core transformer. The primary windings are very thick, and there are about 10 turns. the secondary has Many windings, a few thousand. The primary current is limited by the frequency (Xl = 2*Pi*f*L) so high frequency means high resistance of the coil, and that means a low current. now  how does the switching process work? and what's the use of the brown capacitor?

Question by DELETED_Electorials   |  last reply



A Question about transformer? Answered

In transformer formula , the primary turns and secondary turns affect the voltage and current directly. Why some transformer output voltage is affect by frequency and core type , just like Flyback Transformer(LOPT) and Tesla Coil specifically is Solid State Tesla Coil?

Question by james34602   |  last reply


How oscillators work?

Why oscillators like wien bridge oscillator or RC phase shift oscillator gives only sinusoidal waves instead of triangle waves or square waves of particular frequency. Please dont explain about multi-vibrators . Also please say how to differentiate between low frequency oscillator and high frequency oscillator. By using any value of R(resistance) and C(capacitance) i will be able to get any frequency(high or low) by substituting in respective formula. But what makes one to judge a oscillator as high frequency or low frequency.

Question by deepakmurali   |  last reply


FM Transmitter mod help

Does anybody have any idea how to modify a car FM transmitter for an mp3 player so that it will transmit in frequencies other than the low and high extremes built into it? Also would it somehow be possible to make it transmit to all FM frequencies at the same time? If someone could help me out with this I would really appreciate it.

Topic by kurdiz   |  last reply


how to convert High Voltage DC into AC without changing Voltage? DO CAPACITORS WORK ON HIGH FREQUENCY CURRENT? Answered

I want to build a Spark Gap Tesla Coil but the problem is that I am unable to find a neon sign transformer locally. so i decided to a voltage multiplier. But its output is DC which means that Capacitors (most probably) not work. so please can you tell me how to convert dc to ac without changing its voltage. ALSO, I was wondering whether a capacitor will work with high frequency flyback transformers or not. ????????????????????????????????

Question by SHREYANSH_HV   |  last reply


What ultrasonic frequency actually hurts dogs? Answered

I AM NOT TRYING TO TORTURE ANIMALS. I'm trying to make a dog repellent device and I need to know how high I can make it before it hurts the dog, because hurting it is not my intention.

Question by martzsam   |  last reply


Trying to build a square wave generator (high frequency) and H-bridge

Hi, I was wondering if someone could help me out at building a high frequency variable square wave generator. Specs: 100kHz - 1Mhz (better if I can get up to 3Mhz), 5 to 20V, square wave. Right now I have a LM555 timer. I have read online that I can get it to run at maximum 1Mhz. I don't know what I'm doing wrong, but I can't get it to output at higher frequencies. Also, does anyone know of a good H-bridge circuit schematic that could output 24V pk-pk at 3A. I will be using the signal from the square wave generator to feed to the H-bridge, therefore, is there a H-bridge design that can handle high frequencies? Or, is there another driver circuit that I could use instead of a H-bridge that could do the same job or better?

Topic by sonny301   |  last reply


can laser be used as a frequency source for a photodiode which can act as a transmitter/oscillator? Answered

Photodiode induce current when a light of paricular wavelenth/frequency  strikes on them..laser have a high frequency and low wavelenth......instead of light but electromagnetic waves,can it act as a source of frequency on photodiode hence making a oscillator????

Question by arihant   |  last reply


Can a fluorescent light ballast be used to drive a Tesla Coil?

I'm thinking of the newer 'magnetic' high-frequency ones, or maybe even a CFL (https://www.instructables.com/id/MAKE-A-HIGH-VOLTAGE-SUPPLY-IN-5-MINUTES/). Of course a ~15 Watt CFL isn't going to output very much though.

Question by PhahQ   |  last reply


Question about op amp frequency response? Answered

Hello , i have some question about op amp frequency response. i use non inverting like the scematic below.If i set  R1=10kΩ  , C1=220nF  ,  R2=100Ω  , C2=1uF . R1 and C1 will set low frequency response of opamp at 72Hz . R2 and C2 will set high frequency response of opamp at 1592Hz.  But how much it affect the signal in dB ? and how its affect the signal if i set R2=100k ,C2=1n (gain~11)? Can you give me the formula please ? Thanks very much! Sorry for my bad English!

Question by login721   |  last reply


How to charge up a capacitor? Answered

I heard some website just use a transistor and transformer circuit to charge up a photo flasher cap.(May be high frequency output) If so , can I charge up three or four capacitors with parallel or series circuit?

Question by james34602   |  last reply


Snubber network? Answered

Although my flyback transformer driver appears to work very well up to 18V operation, the arc length is not satisfactory. I increased the voltage to 25V which allows 2 to 3 inch stable / hot arcs. However my 250V 18A rated MOSFETs appear to fail periodically esp. When adjusting the potentiometers (for adjustments to drive frequency and duty cycle) I Tried sticking a 1N4007 reverse biased diode across but I don't think it changed anything. I still see >300v positive voltage transients. I also tried using a neon lamp without a ballast resistor, but it did not appear to change the waveform, and glows way too brightly. I tried using 3 (really old but giant) 30V zener diodes in series but they latched up, failed, and went up in smoke lol! So clearly these HV transients have a lot of "oomph" behind them. D:  I am reading an article on maxim electronics page about snubbers https://www.maximintegrated.com/en/app-notes/index.mvp/id/848 and I'll experament with some of the circuits presented there but I can't really calculate values needed for the components because I have not characterized my transformer with custom windings and a loose ferrite core. Those things will be subject to change anyways since I do not plan on supplying a specific flyback transformer with this kit. So I want something that is more universally going to work. This high voltage is just  PITA to deal with. How can I reduce it to 200v without hurting performance?

Question by -max-   |  last reply


Is there a difference between a high pass filter with an op amp and a high pass filter without one? Answered

I'm trying to modify a guitar effects pedal of mine to remove some squeaking and decided that a highpass/low pass combo with some potentiometers to modify the highpass and low pass points (since my pedal emits squeaking at different frequencies on different settings) and I was wondering if I should use a high/low pass with an op amp, capacitors, and resistors - or just a simple resistor and capacitor filter. Does anyone know if either configuration is a detriment to sound quality?

Question by Squag   |  last reply


Why to use RF directional couplers in some measurements and control processes ?

I am an electronic engineer in the field of RF directional couplers, but I am puzzled about this question, why to use RF directional couplers in some measurements and control processes ? Today I come to this forum to turn to you to discuss my understandings are appropriate. Here are my personal understandings: RF radio frequency is referred to as RF current, it is a high frequency AC change electromagnetic wave short. Less than 1000 times per second changes in alternating current called low frequency current, more than 10000 times called high frequency current, and radio frequency is such a high frequency current. RF technology in the field of wireless communications with a wide range of irreplaceable role. In the electronics theory, the current flows through the conductor, the conductor will form a magnetic field around; alternating current through the conductor, the conductor will form an alternating electromagnetic field, known as electromagnetic waves. When the electromagnetic wave frequency is lower than 100khz, the electromagnetic wave will be absorbed by the surface, can not form an effective transmission, but the electromagnetic wave frequency is higher than 100khz, the electromagnetic wave can be spread in the air, and the outer edge of the ionospheric reflection, the formation of long-distance transmission capacity (Analog or digital) with high-frequency current modulation (amplitude modulation or FM), the formation of radio frequency signals, through the antenna to launch into the air, the radio frequency of the high-frequency electromagnetic waves.  Long-range radio frequency signal received after the anti-modulation, reduced to the electrical information source, this process is called wireless transmission. Wireless transmission developed for nearly two hundred years, forming a large number of users and product groups, but because of climate change and the impact of surface obstacles, can not transmit the perfect information. Modern human invention of the cheap high-frequency transmission cable (radio frequency line), in order to pursue the perfect quality of information transmission, taking into account the original wireless devices, wireless cable transmission began to pop. Resulting in the concept of radio frequency transmission. If your information source through the secondary modulation, with the cable to the opposite end, the opposite side with anti-modulation of the information source after the re-application, no matter how low frequency, but also radio frequency transmission, if there is no modulation anti-modulation process, The information source is transmitted directly to the opposite end of the cable, no matter how high the frequency, are the general cable transmission. SI --- Signal Integrity Signal Integrity PI --- Power Integrity Power Integrity emc --- electromagnetic compatibility Electromagnetic Compatibility rf - radio frequency RF emc = emi + ems EMI = Conduction + Radiation Emission SI: The Fourier transform shows that the higher the signal rises, the higher the amplitude of the higher harmonics. The MAXWELL equations see that these alternating harmonics produce alternating current at the adjacent line. And even through the space parasitic capacitance directly to another conductor, so these high harmonics is caused by radiation interference (emission) of the main factors; (that the simple point is that the signal rise faster, the more complete the signal, the better the signal quality, But for emi bad) . PI: PCB exists on the number \ \ analog area, high frequency \ 'low frequency region and other different areas and planes, if the partition is not easy to interfere with each other, that is, conduction conduction (conduction). Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of RF directional couplers. I need continual learnings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help ? thanks in advance.

Topic by maryzhu   |  last reply


which flyback transformer should i get? irf 644?

I am working an making a singing ark and is basically 555 timer circuitry powering it. which flyback should i chose to build it? i heard vintage ones are great but i dont know. i know some of them have a built in rectifiers. will that make the output suck? i have the circuit im using below. i do have an ignition coil at hand. will that work? or is the resonant frequency way off? can i replace the irf 644 with a higher power chip? if so (i know i can) can you give me the specs of them? i found an irf 740 that if 400V at 10A. will this work? is the amps too little?   i would like to get most of all the stuff i need from Radioshack thank you in advance.

Question by -max-   |  last reply


0. What is Current ? 1. What is Voltage? 2.What is Frequency?

My Dout is : 0. What is Current ? 1. What is Voltage? 2.What is Frequency? I know Definition. But i need practical example for this thing OK. So what is my dout is 1. When voltage increased current is also increased !      But in some case When voltage increased current decreased OR voltage decreased current increased. How it is possible Current is depend on voltage so When Voltage is zero then current is also zero only know For Example: When 100 Watt bulb receive high voltage then high electron will flow through tungsten of bulb then bulb will give high brightness ok Then same 100 Watt bulb receive low voltage then low amount of electron only flow through the bulb then bulb give low brightness This is the Rule or Nature So Current is depend on voltage only. Then how voltage decreased when current increased. This is my basic dout not only this and many dout about frequency also And Thank U for Replying ME. Thank U

Question by Xzyamaha   |  last reply


Is it safe to hook this transformer up directly to the AC mains? Answered

I bought an old high voltage transformer from the internet a while back. It seems to work well at AC frequencies (anything higher and it doesn't work at all), and can make some pretty good arcs. When hooked up to a power outlet with 360 ohms of resistance in series with it, it produces a 1.3 cm blue arc. When using a 30 ohm resistor, it makes crazy arcs with a bit of orange (I'm using four 5 watt 120Ohm resistors in parallel, and they still overheat). None of these tests caused the transformer to heat up at all, though. Would it be a good idea to directly hook up the transformer into a power outlet? Would it burn up the transformer and/or my house? A couple other things about the transformer: The primary has around 2 ohms of resistance, but I don't know anything about its inductance. The whole thing is pretty hefty and has a fat iron core. If you brush a wire from a 12 volt power supply across the primaries, you can get a nice spark c: Any help would be appreciated. 

Question by Shagglepuff   |  last reply


How can I turn a square wave to a "logic one" or ON?

Hi, I'm looking for ways to change a square wave to a logic high state. Attached is a diagram of the circuit. It picks up on when you approach it but sends out a square wave of I think about 50 Hz due to induction from mains in the body(?). I would like to turn this frequency into a logic one or ON when the frequency (from the hand) is present and for it to turn to a logic zero or OFF when no frequency is present. My goal is to get a decent logic proximity circuit that I can use to select pins for a binary multiplexer. Attached is a diagram of the circuit which is inspired by this electrocope circuit, that I am trying to interface with other logic components. Basically Im aiming for an electrostatic proximity sensor that spits out a 1 or 0 based on some threshold sensitivity. Would be super greatful if anyone had an idea of how to do this, I really need to get this working rather soon! Best M3rtzi

Question by Mertzi   |  last reply


Diode recovery time question? Answered

Hello, I have a little question about regular diodes. I know that when we connect a high frequency signal to a diode (in series with a resistor), that diode won't fully cut off the current as soon as the voltage becomes negative. (see picture) But what happens if we're not working on high frequencies, but we do create the same negative flank like in the picture? (so just the same as half the cycle of that high frequency signal, but we only do it once?) will the diode still have that same recovery time if the signal goes from positive to negative Very quickly? if that is so, that means that every regular diode fails at blocking a negative voltage pulse? Greetings, Electorials

Question by DELETED_Electorials   |  last reply


Pancake Coil

Hello, I was going to try building an old Tesla "Pancake" Coil, and then write an instructable for it. (please don't steal my idea!) Does anyone have any information or building techniques at all that they can give me to help? The Pancake coil is just a Tesla Coil that has a flat secondary, as well as a flat primary. Tesla used it in his early radio and wireless power transmission research. The primary circuit should be pretty much the same as a conventional Tesla Coil. But I am a bit confused as to how to build the secondary. A few questions I have: What wire gauge should I use (I'm pretty sure that Tesla didn't use magnet wire for this)? How do I determine the space in between the turns? (more to come) I realize that most people don't build these kinds of coils anymore, and therefore most people probably won't be able to answer my questions or give me any info; I'd just thought that I would try and see if any one could. It would help me a lot. Thank you.

Topic by ElectricUmbrella   |  last reply


Audible frequency amplitude modulation of 20kHz carrier for diffraction demo. Answered

I am attempting to build an audio projector that takes advantage of the low diffraction of high frequency audio waves. Audible range frequencies diffract more than, say 20kHz, so I want to modulate a 20kHz carrier wave by an audible range source, hoping that the carrier wave will be maintained for longer distances (like a beam of sound), and that my ear will ultimately perceive the audible input being delivered on the carrier wave. My question is: Should I be aiming to produce an AM Radio type modulation that has an envelope of the input both above and below, mirrored across the x axis? Or should I try to make it so the final signal has the same shape as the source wave, just filled in with 20kHz carrier? Also, is a square wave carrier sufficient, or will it need to be a sine wave?

Question by laserjocky   |  last reply


Recording ultrasonic sound

I looked up at bat detector, a device that converts ultrasonic signals into audible sounds. Most bats produce high frequency calls which are often higher than a human ear can pick up. A bat detector picks up the frequencies and then converts the sound into a lower, audible frequency. I was thinking if I could get a bat detector, I use it to capture the ultrasonic sounds.While bat detector could pick up these high frequencies, it would be interesting to see how it will pick up the faintly heard, to human ears - sounds of the industrialised areas/city or even at isolated/quiet areas. The bat detector I want to use is this - http://www.magenta2000.co.uk/acatalog/B ... _Bat4.html I'm thinking of hooking up the bat detector to a digital recorder and a binaural microphone and capture the sound through those equipments. I would greatly appreciate your suggestions/opinions on this matter.

Topic by drifterocean 


I need a way of measuring a 0-1000kHz signal (50% duty cycle square wave from a TSL237) with an arduino. Answered

I'm willing to use external hardware if it is cheap.I've tried using an interrupt base pulse accumulator but when the frequency becomes high the counter increments so fast that it stops the arduino from doing anything else (like stopping counting). Does anyone know of a nice easy solution to count frequency? Perhaps a fancy 8 pin DIP that talks i2c? I need to be senstive to the very low end of the frequency scale too, so just throwing a prescaler on will not solve this (afaik). Thanks.

Question by quatch   |  last reply


Carbon Button Lamp

The Nikola Tesla group forum is asking for new projects, so I'm posting this as a suggestion. I would love to build it myself, but I lack the tools and money. This is my first contribution to Instructables, so please comment constructively. Nikola Tesla invented the Carbon Button lamp as a kind of incandescent light, because Thomas Edison banned him from using his incandescent filament bulbs. Nikola later discovered that versions of it could also be used in wireless, trans-Atlantic telegraphy, and to investigate what we now call x rays. In fact, he even used the lamp (or something similar to it) to take x-ray photographs, 8 years before Wilhelm Rotgen discovered them.For this reason, I must warn you: this device may possibly generate x rays. I am not responsible for any harm of any kind that may or may not result from re-creating this interesting device. There are phosphors that you can buy that will absorb x rays and re-emit them as visible light. I recommend that you coat the bulb with it until you know for sure that the x rays aren't strong enough to hurt you, or if makes x rays at all. Mixing it with a phosphor made for uv light wouldn't hurt either. Theory of Operation:The bulb is powered by a Tesla Coil, or other source of high voltage, high frequency current, such as a driver for a plasma globe (actually, the modern plasma globe is descended from this kind of technology!)When the power is turned on, electricity bombards the carbon button. Because carbon isn't the best conductor, this causes the button to heat and release electrons into the bulb's vacuum (the technical name for this is "thermionic emission," or the "Edison effect") . These electrons, in turn, excite the remaining air molecules and cause them to create visible light. This is strikingly similar to how fluorescent lamps work!Supposedly, the bulb should shine 10 times brighter than an incandescent bulb.(Note that the excitation of the air molecules, not the incandescence of the button, is actually the main source of light from the bulb.)If anyone decides to build it, please post an instructable showing the steps and finished product. I suggest you get started by reading the patent, number 514,170. You may also want to read part of Tesla's lecture, "Experiments with Alternate Currents of High Potential and High Frequency."To anyone who will attempt this, I wish you good luck!

Topic by ElectricUmbrella   |  last reply


Variable AC Power Supply ?

I need for my experimental work , one Variable High Voltage AC power supply with Variable frequency ?Any body can help , it will be highly appreciated. thanks 

Question by fezanali1   |  last reply


Is there anything that emits a high frequency that human ears can't hear yet would scramble digital voice recorder. Answered

As I'm a local chairman for a union. Sometimes an investigation isn't going as we would like it. And the company that employs us sets a portable voice recorder up so, that they can transcribe it at a later date. So my thought was if I could scramble or delete the recording somehow then everybody stays working. No harm. No foul, Right??? It may be wrong, but is it really. When you are trying everything you got to keep people employed, that have made an error or two on there job. Please Help. All the knowledge that you guys have brought forth so far is amazing. Thanks 

Question by dougiam2004   |  last reply


Hartley or Colpitts oscillator

I need Hartley oscillator or Colpitts oscillator. I tried a lot but failed. I am simulating circuits on multisim but not been able to get sine wave. Can anybody help me with that?? I am using these oscillators because I want high power oscillator in high frequency range.

Topic by m_uamir72001   |  last reply


how to generate signals arduino? Answered

  uhi i want to generate 3 equal variable pulse high with constant pulse low signal that vary with potentiometer and asume it repeat it self every  10us and pulse min is constant 2u and pulse high vary betwwen 5-8u and i want it to carried at specific frequency? i attach the signal i want to generatel 

Question by britich   |  last reply


Oscillator with AND and NOT gates? Answered

Hi, I've been recently working with logic gates and that's when this struck me.If an AND gate and an inverter are hooked up as per the attached schematic, can point A function as an oscillator?Assume that the gate inputs float high. If so 1)What would be the frequencies of the oscillations if the gates used are a)CMOS b)TTL ? 2)Would the frequency change with the input voltage ? 3)Is this implemented elsewhere? Thank you for reading my question.

Question by Adarsh_tronix   |  last reply


is there a buzzer of sorts that replicates the mosquito buzz ringtone on cell phones?

This buzz, if u dont know, is a very high pitch/ frequency which can get kind of annoying u probably know what the next step is..

Question by raykholo   |  last reply


Higher powered speakers with lower powered amp or Low powered speakers with higher power amp?

There is a lot of conflicting information on this and I would like to know if my speakers/amp would get damaged. Using 80w speakers and a 50w amp will there be any problems with running on full volume? And if I got a 100w amp with those 80w speakers will there be damage, even if I added a heat sink to the back where the voice coil is? The speakers say 80w max but not really reliable as they are well priced Chinese speakers. Speakers: 80W Audio Sensitivity: 88dB Frequency Range (Hz): 100-20Khz 4 Ohm Amp: Efficiency: 90% Rated output power: 2*50W+100W Working voltage: DC18V to DC24V The maximum output current: 4A Frequency Response: 20Hz-20KHz Can drive a 3-16 ohm speakers In the condition of rated voltage 24V The sub woofer channel at rated voltage 24V state can drive 2-16 ohm sub woofer Bass cut-off frequency independent regulation 20HZ-20KHZ adjustable Very confusing conflicting info online with under rated amps causing clipping and over powered amps frying the speakers. Originally I thought it was only bad to over power the speakers. Any help about what is worse, is appreciated.

Question by bonze77   |  last reply


I'm willing to create a zvs induction heater but I have some questions Answered

Hello there! I want to create a ZVS induction heater but I don't fully understand yet how the coils need to be driven. I haven't started yet with building it, but I already wanted to check if the induction heating effect was working, so I connected a coil onto my high current DC blockwave generator and nothing really happens. it's a PWM controller which switches between 0V and the applied voltage. Is it because it sends DC signals to the coil, and the magnetic field goes into saturation? If so, I added a capacitor in series with the coil, to filter out the DC component but now nothing happens. There is nearly no current flowing trough the circuit. I'd also need some information on what influences the intensity of the heating? Is it the Amp*Turns that matters? because we're using high frequency here to lower the required current; but if it's amp*turns then we need the current to be as high as possible. So something's wrong there in the way I thought this works :/ I do know how the material gets heated. (by eddy currents that increase if the flux alternates at higher amplitudes) also, at what voltage should the coil be switched? does the voltage matter? Should I use something like 12v? 40v? or even 2v of I only need high current? I do know that the use of the high frequency is to increase skin effect in the material to be heated, but what other reasons are there for using such high frequency? Is it also because eddy currents will increase at higher frequency? If so, why would this happen? A lot of questions indeed :) but I'm not going to start copy-pasting the circuit, and then just being happy that it's working. I also need to know Why it works, and how! Thanks in advance, Electorials

Question by DELETED_Electorials   |  last reply


what is the cheapest way to make a AA joule thief HV?

After trail and error i have made a joule thief with the following: 2n3409 transistor, 1k ohm resistor, led, and an air coil. what would i need in order to boost the power up to say 100v or more? the cheaper the parts the better, at least for now. I've read some what about micro controllers and using 2 555 times, but i am unable to use anything that requires a computer. everything needs to be simple enough to be used via a bread board. I am desiring high enough frequencies and voltage to jump a small spark gap. i am aware the spark is waste, but that is the point.

Question by freenergyfuture   |  last reply


Another theory...

I was wondering if this is doable, or even practical for that matter. So I read up on lasers and from what I can tell it is a form of light in which the wave frequencies are perfectly aligned. So I was wondering if you aligned UV light wave frequencies, would you get a laser that would burn stuff, and not to sound morbid, but in high quantaties, kill people. (Only for the sheer exitement of figuring something out am I posting this. I do not in any way want to kill someone.)

Topic by vroom...vroom...   |  last reply