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 =)?

Asked by afreeland 8 years ago  |  last reply 8 years ago

Frequency of 12v halogen transfomer?

Hello everyone.. I would try using a 12v transformer halogen (please see photo) for flyback driver (about 10-30 watts) .But seller sell on Ebay do not know the frequency of 12 vac, so could you help me to know that(frequency of 12 vac out) thank you in advance.

Asked by lam 4 years ago  |  last reply 3 years ago

how to measure frequency in this circuit?

i want to measure the frequency of this flasher circuit but i always get a frequency close to that of the mains. I am using a wall wart. i changed some of the components to speed up the flashing but the frequency reading stayed the same. to check my multimeter i tried measuring the frequency of mains and the joule thief circuit and it looks like my multimeter is good. how should i measure the frequency in this flasher circuit?

Asked by codestroy7 7 years ago  |  last reply 3 years ago

555 pwm AND frequency controllable? Answered

Hello, I've been breaking my head on this for a while now, and still couldn't find a correct solution for this. I want to be able to adjust the duty cycle (pulse width) with one potentiometer, and the frequency with another potentiometer, using a 555 timer. Adjusting the frequency shouldn't change the duty cycle! (which is the problem in All of the circuits I find online). This is an example of a circuit I find online, many of the circuits look just like this one (see picture) Now, the problem is that when you increase the resistance of the potentiometer for adjusting the frequency, that makes sure you can never get 0% or 100% duty cycle anymore! or not even close to that. It's because increasing that resistance, also decreases the 'discharging current' of the capacitor, so it will also increase the discharging time when that's not wanted. Without R2 it works perfectly, from 0% to 100% duty-cycle; but with the frequency potentiometer it all gets messed up. It's a little difficult to explain, I'll try it with another example :) To get 0% duty-cycle (or something close to that, like 10%), you'll need to make sure the path for Discharging the capacitor goes near 0Ohm. Increasing the potentiometer for the frequency makes that impossible because it's in series with the capacitor's charging and discharging circuit. So that would also increase the discharging time while I don't want that. When the resistance of the frequency potentiometer increases, the duty-cycle gets variable between just something like 45% and 55% (example) so that's not good. Is there any way do do this? :/ Thanks in advance, Elecotrials

Asked by DELETED_Electorials 7 years ago  |  last reply 2 years ago

Changing the frequency of Ultrasound Massager ?

Is it possible to convert one of those existing portable Ultrasound unit thats use ( 1- 3 mhz ) to lower frequencies i.e.  35 - 350 khz  or build one form scratch ? thanks hele

Posted by hele 8 years ago  |  last reply 8 years ago

Can the arduino detect frequencies?

I want to make a spectrum analyser and I want to use a micro controller, but I don't know how. I want to know if the arduino (any one) can split up the different frequencies and output them, so I can use it as an input to an LED driver (LM3915). This will allow the LEDs to be at full brightness and respond to the output of the arduino, if the frequency filter is possible. If not, I will use a series of bandpass filters instead. I want to make an 8 band spectrum analyser. I just thought that using an arduino would be cheaper. Thanks. The schematic I will be using:

Asked by knektek 5 years ago  |  last reply 5 years ago

microcurrent frequency specific device?

How To Create Frequency Specific Microcurrent? I am looking to build a two channel (A/B) microcurrent (allowing from 20 - 600 microamps) with selectable frequencies ranging from 3 to 970 Hz). This is based on a medical device that I'm looking to replicate. I've figured out some of this but again, considering the wealth of knowledge here I'm sure some would know the best way to build this. here are specifications Description Device Specs Frequency Range: 0.1 – 999.9 Hz programmable Wave Form: Square pulses Duty Cycle: 50% Current Intensity:  20μA to 400μA Constant current generator Output Polarity: Programmable alternating, positive or negative Output Load Resistance 0 to 100K ohm Output Channels: Two fully independent channels Output Connection: 3.5 mm mono phone jacks Programming Port: micro-USB Memory: Professional-up to 999 programmable protocols; Patient: up to 99 programmable protocols Power Supply: (2) AA alkaline batteries Dimensions: 5.1 x 3.2 x 1.2 inches Weight: 6.42 oz here is the link i am following

Asked by kedarg2 1 year ago  |  last reply 6 weeks ago

Bluetooth vs Radio Frequency Answered

This is a 3 part question: 1. I am a bit confused. Radio frequency covers 3KHz to 300GHz, so it basically includes bluetooth(2.4 GHz). Why is it that some people talk about bluetooth as something not relating to RF. Do they have different transmission methods? WIFI is also @ 2.4GHZ. What is the distinction between WIFI and bluetooth that makes them so different, covering different ranges, and being able to send different amounts of data at different speeds. I always thought it was the frequency of the wave but WIFI and bluetooth are the same yet they are so different.  2. I am building a project. I need to send data wirelessly. The data is very simple just to turn on or off a series of leds. A friend of mine told me to use radio waves. What does he mean by that exactly since radio range is huge. Is he talking about 40MHz like the RC cars? 3.Bluetooth or RF(again im assuming this to be the same one as RC cars since i will break apart an RC car to remove the transmitter/receiver)Which method consumes less power to send the same amount of data. Distance will not be over 10 meters so i'm not worried about that.  Thanks for the help everyone, much appreciated! Chris

Asked by Chris414 6 years ago  |  last reply 2 years ago

Frequency driven speed for chase lights..?

I have some battery operated chase lights (Christmas lights) that I want to wrap around a musical instrument.. When I play a note, I want the frequency of the note to drive the chase light speed. So higher notes will make them chase faster than lower notes.. How can I do this?

Posted by 3DPiper 5 years ago  |  last reply 5 years ago

Is there an easy way to change the electrical frequency? From 45hz to 60hz?

Is there an easy way to change the electrical frequency? From 45hz to 60hz?

Asked by 9 years ago  |  last reply 9 years ago

How do you change the AC frequency?

How do you change the AC frequency that comes out of the wall?

Asked by Comhippy 9 years ago  |  last reply 9 years ago

Can I reduce the frequency of the newsletter ?

Hello all fellow makers ! It seems I can change the frequency of almost any other email sent from Instructables but I can't figure a way to reduce the frequency of the newsletter.  Once a week would be nice.  Is there a way ? Thanks, Guillaume

Posted by aka.guf 3 years ago  |  last reply 3 years ago

frequency filter

I've never designed a filter before and I'm not sure if you can do this. Basically I need a way of filtering out all signal except for signal in the range of 40-150 Hz

Posted by guyfrom7up 10 years ago  |  last reply 10 years ago

Help converting 60hz to 50hz

I currently have bought an aquarium pump from the UK and am using it in the United States. I have bought a step up transformer that goes from 110v input to 220v output. The pump works, but is not functioning properly, it loses flow rate over time and gets pretty warm. One thing that I think may be affecting the performance is that the frequency difference between what the pump is rated at and what is supplied here in the US. What would be a cheap (<$100) easy way to test if it is the frequency issue? How would I convert it? Thanks!

Posted by brandon3rdstone 6 years ago  |  last reply 6 years ago

designing an LC4/LC5 package for mm-devices using Eagle CAD tools?

Hello every one, Since i am totally new to PCB designing and all these stuff, I want to know few things about Eagle CAD tools I will be designing a Frequency up-donwn converter as a University course project. out of many components selected for this project one of them is as follow. i have gone through designing of the LC4 package, i hope it would be fine, still i would like to know how to creat ground of a package, creating outline boundries of package (is it from wire or from rectangle, polygon??) and about symbols inside this package, i am confused about drawing them exactly and connecting them to each other (via wire or net or what??), should they be just symbol or e.g i have to draw even what is inside circuit of a mixer or amplifier etc.. I shall be very much thank for your kind help

Asked by lali2 7 years ago

Using 433M-Transceiver-Module-E32-TTL-1W-SX1278-SX1276-30dBm-LoRa-Long-Range-433MHz

How do i use  433M-Transceiver-Module-E32-TTL-1W-SX1278-SX1276-30dBm-LoRa-Long-Range-433MHz with arduino uno, like schematics, codes, what is MO, M1 to transfer data as I can not find much about it. Cheers

Posted by laidlow7 1 year ago

Arduino + RF to create item/finder?

IDEA 1. I've got the idea to create this kind of project where people nowadays being careless and misplace their item. So to counter this problem, i want to create a device which can detect the object/item within an area/radius of the receiver and transmitter. 2. This is not only for item/object but also can be placed on your children just in case they are away from you thus this device can alert you in sound, sight ( blinking LED ) , and vibration. PROBLEM 1. Is it possible to only use 1 transmitter and receiver? 2. Just in case for future uses, can compass be implanted in this device where it will always shows to the transmitter? 3. Currently programming are very hard for me, where can i get reference for programming this kind of device?

Asked by Isaace11 3 years ago  |  last reply 3 years ago

frequency of composite video signal ?

I try to configure a tv / video card on my computer to display input from composite video (yellow plug) input when i choose any of the inputs i still have to set the frequency (above). it should be some fixed standard frequency. what is it for pal b/g ?

Posted by 11010010110 10 years ago  |  last reply 10 years ago

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.

Posted by 012345678910 9 years ago  |  last reply 9 years ago

What happens when you induce two currents of differing wavelength on the same line? Answered

If I induce two currents of differing wavelengths on a single conductive body, say an iron pipe for example, how can I calculate what the resulting signals wavelength will be? Is it as simple as taking the root mean square of the frequency of the signals? Any ideas for calculating the voltage of the final signal? ------------------------------------------------------------------------------------------------------------------------- Example: Signal 1: 60hz at 100v Signal 2: 75hz at 100v RMS frequency sqrt(((60^2)+(75^2))/2) =  67.9153 ------------------------------------------------------------------------------------------------------------------------- Thanks  a bunch!

Asked by paulcauchon 8 years ago  |  last reply 8 years ago

Measuring oscillation of a multi tool

I have a harbor freight oscillating multitool that is advertised as oscillating between 10k and 20k oscillations per minute. In reality to speed control goes from 0 opm to an unknown value. I’m trying to set the tool to oscillate at 35 Hz. What is the best way to measure the frequency of the tool and set it to 35 Hz?

Posted by rednax718 10 months ago  |  last reply 10 months ago

Antenna length for a frequency modulated signal.

I  am given to understand that the length of an antenna is proportional to the wavelength of the signal that is fed to it (a quarter wavelength, for example). In the case of a signal modulated by amplitude, the frequency (and therefore wavelength) of the carrier wave remains unchanged. However, in the case of a signal modulated by frequency, the signal fed to the antenna will vary in frequency (and, therefore, wavelength). My query is this : how would one go about calculating the length of an antenna for a frequency modulated signal? Its frequency is not constant, so to construct an antenna of say, a quarter of the wavelength, would be impossible. I thank you in advance for your assistance. AlexHalford

Asked by alexhalford 9 years ago  |  last reply 9 years ago

I want to generate 2.4GHz frequency

I want to generate 2.4GHz frequency and transmit as well as received in liquid Which probe can use for transmit and receive?

Asked by vivekbarage 3 years ago  |  last reply 3 years ago

What different frequency meter and counter? Answered

Dear all.. Please help me to know : what is difference frequency meter  and  counter between 2 devices  (please see photo) Thank you so much.

Asked by lam 3 years ago  |  last reply 3 years ago

Arduino to control frequencies with induction coupling?

I want to experiment with inductive coupling, I have made two similar pancake coils of 16 turns of 12 AWG wire(I had it around ) . Now I need to generate a frequency, I know I can generate one with an arduino but I want to generate one to work with the 12v input from a computer PSU to make it more practical. Any way to do this? I'm kinda new to coils/frequencies. 

Asked by Tom101222 4 years ago  |  last reply 4 years ago

how to generate the 2.4 GHz frequency ?

I am designing the anti drone device which can jam the drone in operating condition and make it inoperable. but i am struct with the problem that how to generate the 2.4 GHz frequency using voltage controlled oscillator.

Asked by AbhinavD9 1 year ago  |  last reply 1 year ago

How to change frequency on RC toys

Hi , i just got this Rc Nikko Heavy metal, i think it's quite rare because i can't manage to find it anywhere in the Internet. So, it was an old lady who gave it to me on a garage sale, and it came with a rechargeable 7.2 v battery pack, but the controller was missing, and i don't know how much MHz it's on. so how can i change the frequency, does it work with a donor car?like i change the whole electronics setup?   1000 thanks for answering

Asked by CeskoG2311 5 years ago  |  last reply 5 years ago

How To Create Frequency Specific Microcurrent?

Curious if some of the electronic gurus might have the answer to this. I am looking to build a two channel (A/B) microcurrent (allowing from 20 - 600 microamps) with selectable frequencies ranging from 3 to 970 Hz). This is based on a medical device that I'm looking to replicate. I've figured out some of this but again, considering the wealth of knowledge here I'm sure some would know the best way to build this. Oh yeah, I figure using a rechargeable battery which could be whatever voltage is best recommended. So what do you think???

Asked by pletchman 3 years ago  |  last reply 16 days ago

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." 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: In greater depth: Videos: 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)

Asked by snotty 7 years ago  |  last reply 5 years ago


Interested in knowing how to repel mosquitos using a frequency generator. Or can someone guide me in building a frequency generator to attaract mosquitoes (not kidding) so that i can lure them into a trap and kill them. Looking for genuine answers please.

Asked by ramki695 9 years ago  |  last reply 6 years ago

Determining frequency of processor And AVR O.C. ?

So This question has two parts.... i need to measure the frequency of a computer processor.....and an avr microcontroller........ actually i want to know weather it is possible to connect a arduino to a pc's processor through wires or an avr through wires to a secondary system like an arduino which will measure the frequency....... and is it possible to overclock an avr ? if yes , then how can i ?

Asked by _Boltz_ 2 years ago  |  last reply 2 years ago

How to make a frequency converter? 2.4GHz to 600Hz

Greetings, I would like to know how to make a frequency converter. I want to convert the 2.4 GHz from a WiFi transmitter to one fourth or 600Hz which is in the newly freed up white space area for greater range. Anyone know where to find schematics for this, or make schematics? Is the circuit complicated? Thanks

Posted by NeuroPulse 7 years ago

Trying to create a circuit to allow me to adjust the frequency of AC power

I'm trying to design an EM field generator with adjustable frequency. I've got most of it figured out, but I can't seem to find anything about how to create adjustable frequency AC power. I've got two designs I'm working on, one that is DC powered and one that is AC powered, but the best I can do on either ends up with a 60Hz EM field. I'm looking for adjustable frequency, ideally from 0.1Hz to 50kHz, although I'll be pretty happy to even get any range of frequencies at all. The range from 0.1Hz to 500Hz is the most useful and interesting in particular for my purposes, but any help on figuring this out at all would be much appreciated.

Posted by PsychoHazard 7 years ago  |  last reply 7 years ago

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.

Posted by brickzima 10 years ago  |  last reply 6 years ago

How can you generate a signal up to 150 MHz with an AVR?

How could I generate a signal, whose frequency could go up to 150 MHz? I'd like to use an AVR, but how would I do that?

Asked by DemonDomen 9 years ago

Where can I buy a cheep four or eight channel bandpass filter?

I want to build device that will contain LEDs. Each LED will light up to a different frequency. I believe this is the part that i need for this, is it not? if so does anyone know where to get them?

Asked by jmkloz 9 years ago  |  last reply 9 years ago

How to change frequency on RC toy car?

Hi all. My friend and I bought 2 rc toys (1:18 scaled Ferrari F1) just for fun, but they work on same frequency (40.685 MHz) so we can't drive at same time. So i need some suggestions on how to change the frequency on one of them. The transmitter have quartz crystal, but receiver have only coil. I already tried solution "Modding Fisher-Price 72825 Formel Junior Fernlenkflitzer" found on this site, but it didn't work. I ordered quartz crystals from China working on (40.885, 40.985 and 40.285 MHz) and when i changed them in transmitter (one by one) the rc toy still reacted on commands from transmitter. Is there any other way to change frequency? Thanks in advanced.

Asked by dule666 9 years ago  |  last reply 1 year ago

Have music control a device with sine wave and frequency? Answered

Whilst I was using  a TENS unit (electric muscle stimulator) and was messing with the frequency and pulse width controls, I thought to myself, "What if I would redesign this device, so that I could plug it into my mp3 player and it control the frequency and pulse width so I could literally feel the music?" After long though, and looking to see if such a device existed (None that I could find.) I came up with nothing. Now my question is, how could I design such a device that would take in standard audio, and give a pulse width and frequency output? I would assume I would use a pulse width modulator (PWM) for the first part, but what about the frequency? And how would I make this as one unit? I am a complete novice at sine waves, frequency, audio, and things in that area, and I find the best way to learn is do a project involving it. So would anyone have an idea how such a device could be designed? Link, circuit diagrams, and tips are all gladly excepted.

Asked by RocketPenguin 5 years ago  |  last reply 9 months ago

What radio frequencies will be legal for wireless microphone use in 2012? Answered

Hello, I will be wanting to purchase UHF microphones that comply with the new frequency changes in the UK. I have found many recourses on the internet but none seem to match up? I would be very grateful if someone were to tell me what channels you can operate on (license exept) in 2012. Many Thanks Oscar

Asked by oscarthompson 7 years ago  |  last reply 7 years ago

1 watt Frequency Doubled Violet Laser

I want to make a 1 watt violet laser, by using a 1 watt 808 nm laser and channeling the laser through a KTP crystal. Judging from my humble knowledge of second harmonic generation, That should create a 1 watt violet laser beam. Correct?

Posted by Nexoid 8 years ago  |  last reply 8 years ago

How to do an MIDI to frequency conversation without a microcontroller? Answered

Hello! I want to build up an MIDI synthesizer. My main problem is the conversation of the MIDI signal to a frequency. I know it could be done with a microcontroller, but I want to realize it just with resistors, coils, capacitors and non-programmable ICs, because it should be a real only-hardware synthesizer. I do not to interpret all the MIDI control signals, just note on/off. So does anyone has a idea how to realize this conversation just by hardware? Thank you in advance!

Asked by electropeppers 8 years ago  |  last reply 7 years ago

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.

Posted by kurdiz 10 years ago  |  last reply 10 years ago

555 Timer Calculator

Hi everyone, I was looking around on the internet a while ago for a calculator for 555 timer circuits and couldn't find one that worked very well. Then I set about making my own in a Excel spreadsheet to calculate the frequency and duty cycle for me. I have decided to share it with everyone to help others. It is quite simple. Enter your vaules into the yellow boxes and get your frequency and/or duty cycle from the blue boxes.

Posted by qwertyboy 9 years ago  |  last reply 9 years ago

Need help changing an AC circuits frequency

Alright, so I have a question about an alternating current circuit I was working on.  The wall outlets I'm drawing power from are AC at 120V, and 60 Hz, but I need it to be 120V at between 60 Hz and 1000 Hz.  A variable system would be nice, but I'm not picky.  How would I do this?  Is my only option to convert the power to DC, and then run it through an inverter?  I would like to be able to do this with a small circuit I could build, something that would fit in a project box.  Any ideas?

Posted by Avren5 8 years ago  |  last reply 8 years ago

Is impedance and resistance the same thing in a simple resistor? Answered

Thinking of just this case using an AC current with a frequency of 1k Hz, thru a simple non-inductive resistor. Is the impedance of the resistor the same thing as the resistance measured using DC?  Is it equal to the resistance in value or different altogether? (sentence edited to change inductance to impedance) I think it's the same thing and so equal in value.  Or maybe I've still got a bunch of reading to do.

Asked by Re-design 6 years ago  |  last reply 6 years ago

How do i change the RC frequencies? Answered

I have gotten a RC helicopter from a friend but it has no controller and the IC chip is soldered in and the frequency is 40Mhz . So I was wondering how I can change the frequencies from one controller so that I can use it on my helicopter.

Asked by Tomagedon 5 years ago  |  last reply 2 years ago

How to boost voltage of signal generator frequency? Answered

Okay, here's the question/challenge... I'm using an AD9850 signal generator IC to create various frequencies which works great. Input voltage is 5-volts. However the output is only around .5-volts. What I need is to be able to boost that to (ideally) around 45-volts without affecting the frequency created. The ultimate amperage I am working with is only 20-600 microamps so the boost shouldn't be a problem (I think). I've independently used voltage boosters but wonder if those affect the frequency. Then from there I want to make the current biphasic (reversing polarity every 3-5 seconds) so I'm assuming a relay somewhere at this end. What say the resident experts here?

Asked by pletchman 3 years ago  |  last reply 2 years ago

HELP measure resonant frequency on induction heating. ? Answered

Dear  All..... In this circuit and formula  on (GOOGLE). Please could you help me to know 3 questions: -How  I can measure resonant frequency  of this circuit, because it has   2 L and 2 C on this circuit?. - where I  must to put the probes in this circuit for measures frequency? - If I want to used less power(less heating) I must change L  or C  or both?  Thank you so much in advance  for your time.

Asked by lam 6 years ago  |  last reply 6 years ago