Search for Mhz in Topics

cpu mhz help

I have an amd duron at home, but no clue how fast it runs. the only other information on it besides a cpu id is C1999 anyone know about hom many megahertz this thing runs on??

Topic by tech-king    |  last reply

Clock signal from Arduino crystal input pins? Answered

I'm interfacing an Arduino to a chip that needs a 1 MHz clock signal. Can I take one of the Arduino's clock input pins an input it into a 74169 (4 bit cascading counter) to generate a 1 MHz signal?  If not how do I create a 1 MHz 50% duty cycle signal?  Thanks in advance.

Question by maewert    |  last reply

How to change a 433.92 MHz signal in to a 434 MHz signal?

Hi,I have these remote controlled wall outlets (Brennenstuhl Funkschalt-Set RCS 2044 N Comfort). And I'm trying to make an arduino circuit with an RF transmitter so I can switch them on and off without the remote.I sniffed the signal from the remote with an RTL-SDR and found out that the signal frequency is 434 MHz. So I went online and ordered an 434 MHz transmitter (from sparkfun).After I hooked the transmitter to my arduino and wrote the code with the exact same signals as the remote had send out. I tested the circuit and saw that it didn't work.So to see where it went wrong I also sniffed my signal from the RF transmitter, to see if it's the same as the one from the remote. And I found out that the frequency of my 434 MHz transmitter is actually 433.92 MHz.But this turned out that it wasn't a mistake. But the chip in the datasheet even says that it is 433.92 MHz. And when I went online to find a real 434 MHz transmitter I couldn't find one, because all the 434 MHz transmitters that I found were also actually 433.92 MHz.So then I tought how the hell has my remote a 434 MHz transmitter if I can't find one? And I screwed it open and saw in the casing that even the transmitter of the remote is 433.92 MHz. But for some reason it sends out a 434 MHz signal. So it must have some kind of circuit inside that modifies the 433.92 MHz to 434 MHz.And now my question to you is: How can I do that? How can I modify a 433.92 MHz signal to a 434 MHz signal?Thanks in advance!(I uploaded some pictures of the remote, the wall outlet, the RTL-SDR, the RTL-SDR captures on my laptop, The (simple) arduino circuit and the transmitter module)

Question by piet_lu    |  last reply

Design for a 25 MHz oscillator/inverter that can operate at 110 volts.?

Can anyone help me find a design for or creating a design for a 25 MHz oscillator/inverter... I also could use a design for or a compact inverter that can have the same voltage rating but bring the frequency of a dc current to 60 Hz.

Question by amelius    |  last reply


For sale is some Fox Crystals (55.8MHZ) and a crystal assortment. Thanks for looking. 

Topic by tinstructable  

Can somebody help me with a 315Mhz RF module?

Hello everybody At the moment I'm building a circuit that should make a little motor turn forwards or backwards. It will be controlled by an 315Mhz RF module, wich i've bought from The circuit contains: a voltage regulator, a H-bridge for the motor, and a reveiver. When i connected the circuit on a breadboard everything worked perfectly (even without an antenna connected I could control the motor over 20 meters away). Then I soldered everything in place, connected a 23,8cm antenna to the board and I placed the hole thing in a plastic container. Then the trouble came. I can only control the motor from 50 centimeters away, if i go futther the signal light will blink instead of a continuous light. Can anyone help me out?

Question by lukeD    |  last reply

How do you determine the length of an antenna and the size of a fractal antenna? Answered

In an instructable, the formula for calculating antenna length was given as "length in meters =300 / frequency in MHz".  The example given was for a Bluetooth antenna with a frequency of 2450MHz.  The antenna length was calculated as 300/2450 = 0.1225m = 12cm.  The author then divided it by 4 to make a "quarter wave" antenna length of 30mm.  Why divide it by 4 and what is the benefit of a "quarter wave" antenna.  What is the effect of the conductor leading to the antenna?  If the 30mm antenna is soldered to a 4mm lead, does that result in a 34mm antenna?  For a fractal antenna, should the 30mm length of wire be folded into a fractal shape or should the total fractal antenna be 30mm in width?  I have read somewhere that one of the benefits of a fractal antenna is that they are able to receive signals of different wave lengths.

Question by fcampbell    |  last reply

Just how fast can a 2.6GHz Pentium 4 go?

Well I have gotten a 2.6GHz Pentium 4, on the socket 478 with stock cooling, to go as high as 2.94GHz before the system starts to hang. I believe I have the Core voltage set to 1.875v, and I am running windows XP home edition. the system specs (other than the cpu) are: -Ram-1gb in four slots -HDD's-Fujitsu 10gb and Maxtor 10gb -Mainboard-Asus P4GBX -Video-Nvidia Geforce (2?) pci card -Cooling-Stock pentium 4 cooling aparatus and 2 case fans -PSU-350W Enermax The cpu is just a standard socket 478 pentium 4 that has a stock speed of 2.667GHz Has anyone gotten theirs to go any faster?

Topic by zack247    |  last reply

Help with an overclock

Hello Instructables community!I have a laptop and it has been driving me crazy recently!Specifically the graphics card has been driving me crazy, its an integrated mobile Intel(R) 965 express chipset family chip running at 470mhz with 256mb of graphics ram ("stolen" from the normal ram and controlled by the OS) I was wondering if anybody knows of a program that is capable of overclocking it, I have tried rivatuner and power strip with no luck, rivatuner didn't even recognize the card and power strip wouldn't let me change the clocks.I want to make sure that I can change the clocks before I upgrade the ram.BTW: the specs on the computer are as follows:Compaq Prescario c700t CTOIntel Celeron @ 1.7ghz1 GB of shared system and graphics ram (soon to be upgraded)80GB SATA toshiba hard driveWindows Vista Home Basic sp2

Topic by junits15    |  last reply

Help with (streaming) radio, please...

Hello, everyone. I am trying to get live radio stations streamed on my laptop... so far I haven't found anything, and I don't even know if something like this exists. It would be helpful if someone could possibly help me find a program that could stream radio stations. If I need to buy a radio tuner for my laptop or something, I will, but if there is software for streaming it, I would like that better. Thanks to all the Instructables users for all of the help.

Question by account3r2    |  last reply

Walkie-Talkie set at 80 Mhz,50m

Sir,i want to make a walkie-talkie set to work at 80 Mhz,over about 50 metres range.Can anyone provide the circuit diagram and oyher help?

Question by knlkohli  

Is my hearing wacky?

I was just using a tone generator and I chose a sweep mode. I can here 2.1mhz, but when I did a sweep down to 100Hz there was a long pause when I couldn't here anything, and then I can here it. Is this normal?

Topic by guyfrom7up    |  last reply

Phase shifting?

I've been considering building my own ground penetrating radar unit rather than pay outrageous rental fees and mind boggling full prices and I keep coming back to the same problem: time of flight is haaaard. My most recent thoughts on how to go about collecting that data would be to use 2 clocks/crystals that are offset from each other by fractions of a percent(one would be straight from a rubidium standard, and the other from a frequency multiplier). One would be in charge of timing the emitter and the other for timing the receiver. This is the part where I make tons of assumptions about things I know nothing about, so correct me if I'm wrong.      The emitter is running at f1 and it emits a short pulse.      The receiver is running at f2 and collects data as fast as it can until the reflections dissipate.      The emitter pulses again      The receiver, due to the f1:f2 phase shift, is offset by a tiny amount and again collects data as fast as it can. This cycle repeats until the collective phase offsets brings it back around, building the image . My thinking is that this shift, given the time to cycle around, could provide data that is functionally in the range hundreds of GHz, provided the target doesn't move(which at milliseconds per dataset, is functionally true). Could this work?

Question by The Ideanator    |  last reply

R/C car remote question?

What is the difference in the Mhz ratings? Mine is a 27 Mhz, but is 49 any different?

Question by Zem    |  last reply

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?

Question by DemonDomen  

Whats the difference between a 2.4ghz and a 35 mhz radio receiver? Answered

Im thinmking of buying some radio equipment for a radio contol plane I made, at the moment im looking a radio receivers. All I want to know is, is there a differce beetween the two type of receivers (2.4ghz and a 35 mhz). Thanks Oscar

Question by oscarthompson    |  last reply

Can a can 13.56 mhz rfid reader read a 125khz tag ?

It's probably a stupid question but I'm hoping to find out

Question by gradof6b    |  last reply

Crystal walkie talkie range extender? Answered

Hey everybody, I'm modifying some old walkie talkies I have, and I want to extend the range but I'm not sure how to do it, though, because it uses one of those crystal transmitter components to output 49 Mhz. If someone knows how to extend range on radio crystals please let me know! Thanks in advance!!

Question by Adum24    |  last reply

Antenna for 434 MHz ASK RF transmitter module? Answered

Hi, I have these few questions regarding aerials that can be used with a 434 MHz ASK RF Transmitter module.  (data sheet of the transmitter) 1)The recommended length for the antenna is 17 cm,which is a quarter of the wavelength. Will using a 34 cm antenna(half wavelength) enhance the range of transmission? Will it get even better for 3/4 th and full wavelength long antennas? 2)Should the antenna be a monopole? Can I use a helical one instead(picture attached)? What are the ideal dimensions of a helical antenna(with respect to its wavelength) for maximum range ? Should the antenna of the receiver be of the same type or can I have a helical transmitter antenna and monopole receiver antenna ,both of same length? 3)Does Copper traces on the printed circuit board between the antenna pin of the transmitter and the actual antenna,add to the total length of the antenna? If the answer to the previous question is yes,can using coaxial cables to connect the antenna pin to the antenna prevent this from happening? 4)Should the antenna be installed perpendicular relative to the plane of the circuit board?Has it got anything to do with grounding or anything? Should the antenna be grounded too and if so how?(I am a bit confused with this part) 5)Can having the antenna in close proximity to step down transformers and ics ,produce undesired results?

Question by Adarsh_tronix    |  last reply

Where can I get a powerful 14 MHz radio wave generator, and what can contain the waves? Answered

I need a somewhat powerful 14 MHZ radio wave generator. I know that these frequencies are probably illegal, so what can best contain them? I have heard that Faraday Cages can, and a parabolic reflector has also ocurred to me. What would be best to contain them, and is it possible to build one?

Question by Technicolor    |  last reply

for what this capacitor is ? Answered

I can't find 4.7pF ceramic capacitor

Question by Rendydevara    |  last reply

how to calculate this FM Oscillators ?is the ceramic capacitor (beside 2nd transistor) in series ? ?

I can calculate it is by but, is the 4.7pf take effect with the frequency ? how frequency is it, if i change the trimmer capacitor with 20pf (i don't have the trimmer capacitor) ? please help me : )

Question by Rendydevara    |  last reply

how to write specification for transmitter?

I trying to write specification for transmitter that transmit voice signal over 100 meter long at 97 mhz frequency modulation type Input voltage 12 v input current 9 mA input power output voltage output current output power operating frequency 92 - 97 Mhz oscillator circuit that generate 97 mhz frequency transmitting distance 100 meter long how to decide how much output voltage and current I need at output side ?  

Question by vead    |  last reply

Overclocking of my Intel Pentium 4 CPU 3.00GHz 2992 Mhz Processor. How can it be done?

A friend of mine introduced me to the idea of over clocking my processor. He said it can be dangerous due to over heating issues. I am willing to add new fans into my PC so long as the speed can be controlled. I will not be able to obtain a better heatsink however (My heatsink is pretty beefy already). Ive done some research but have only been able to find very broad forums. I need to know how to do it, what to do and what not to do, how far past factory specs i can push it beyond and if my mother board with withstand it.. Also i have a follow up question I notice that the system summery stes that i have 1.57GB Avilible physical memory but i have 2.50 GB Installed physical memory. is there any way to overclock the RAM as well? SPECS: OS Name Microsoft Windows 7 Ultimate Version 6.1.7600 Build 7600 Other OS Description  Not Available OS Manufacturer Microsoft Corporation System Name FASTCAR123-PC System Manufacturer Dell Inc. System Model Dimension 8400 System Type X86-based PC Processor Intel(R) Pentium(R) 4 CPU 3.00GHz, 2992 Mhz, 1 Core(s), 1 Logical Processor(s) BIOS Version/Date Dell Inc. A09, 7/7/2006 SMBIOS Version 2.3 Windows Directory C:\Windows System Directory C:\Windows\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "6.1.7600.16385" User Name fastcar123-PC\fastcar123 Time Zone Eastern Standard Time Installed Physical Memory (RAM) 2.50 GB Total Physical Memory 2.50 GB Available Physical Memory 1.57 GB Total Virtual Memory 4.99 GB Available Virtual Memory 3.57 GB Page File Space 2.50 GB Page File C:\pagefile.sys

Question by fastcar123    |  last reply

What to do with a LM1279N (110 MHz RGB Video Amplifier System with OSD)

I have dismantled a CRT monitor and I was wondering what I could do with the LM1279N (110 MHz RGB Video Amplifier System with OSD).Here's a link to the datasheet for it.BTW, What could I use the OSD settings for?

Topic by thermoelectric    |  last reply

Building blocks associated with Arduino 433 Mhz transmitter & receiver

Newbie here.  I want to make a temperature monitor that will transmit an alert signal to a receiver.  If I use the little 433Mhz  Arduino RF transmitter / receiver modules, what would I need with them?  I know these can be attached to the Arduino programing boards and are made functional by a computer program, but I don’t want to stick the Arduino program board & computer under the house where I want to measure the temperature.  I’m confused by this.  I understand these little units are used in remote control cars & planes, but what do they get connected to?

Question by ItsDavid001    |  last reply

Wifi enabled remote

Hi, I have a remote for my fireplace.  It uses a RF of 303.87 mhz.  I was trying to think of a way to build something that could recieve a message over wifi that would then trigger the 'buttons' on the remote.  I found some RF receiver/transmitters but everything is for 315 or 430 mhz.  Will those work for 303.87? Or was this remote designed to not be easily cloned?

Topic by FrankA2    |  last reply

Is it possible to use a 75MHz am radio receiver with a 27 MHz am transmitter if i match the crystals?

I fried the 27mhz receiver by accidentally reversing the polarity and i had the 75mhz laying around.  I was wondering if putting the 27mhz receiver crystal in the 75 mhz reciever would work.  Thanks in advance for your answers.

Question by jules15    |  last reply

How can you build a short range 72 MHz wireless clock transmitter?

My school uses Primex Wireless clocks across the entire building. There's a single receiver on one side of the school, and I'm quite curious about how it works. I found some white papers on the transmitters, which gave me frequencies. ( What I'm trying to do is create a small transmitter that does the same thing in a very short range. I don't know how to figure out what sort of data is considered a valid time code. I've seen the instructables on making computer controlled radio transmitters, and I'd like to figure out how to adapt these to this situation. Different channels for example, how do these receivers pick up different channels within the 72 MHz range?

Question by applesnacks    |  last reply

I need a fairly easy 500 Mhz to 3 Ghz signal generator schematic

It needs to be fairly simple to make, my resources are a bit low again, and it doesn't have to generator a lot of different frequencies, just one or so within the range of 500 mhz - 3 ghz. Everything I found on line was either more complex then building a 40 meter transceiver, or was ready built and only cost $200 + Even if there was a source I could purchase, for under say $30, I would take that too. I need it to test my newest rig. I don't want to have to resort to something like this project here...

Topic by Goodhart    |  last reply

Which is the better laptop?

I am looking for a laptop for school. Which will deliver the better overall performance? Acer Aspire v3 Processor Type: Intel Processor Model: i7-3630QM Processor Speed: 2.4GHz Processor Core: Quad-core Cache: 6MB Operating System: Windows 8 64-bit System Memory (RAM): 6GB Type of Memory (RAM): DDR3 Hard Drive Type: SATA Graphics: GeForce GT 730M Video Memory: 2GB or Dell Inspiron 17R 5721 Processor:    Intel Core 3rd Generation i7-3537U Processor (4MB Cache, up to 3.1 GHz) Memory:    8GB RAM at 1600MHz HardDrive:    1x1TB SATA Hard Drive VideoCard:    Intel® HD Graphics 4000

Question by cardboarddude    |  last reply

Is it possible to change a remote controller's signal frequency by switching out the crystal oscillator? Answered

        I have several old remote controllers for vehicles and I need to switch the frequency from 49MHz to 75 MHz. I think that I should be able just to switch out the crystal oscillator and replace it with a 75 MHz crystal. Does anyone have any suggestions on if this will work or not?                                                                                                                                                                                                                  Thanks!

Question by transistorguy    |  last reply

Aruino question Answered

I have the arduino uno and i wsa wondering if there is a way i can get it to 3.26 mhz pulse? I don't care if it involves electrical parts.

Question by jbaker22    |  last reply

unidirectional audio speaker. Design discussion

I was thinking of designing a unidirectional speaker driver circuit. As far as I know ,I need to drive the speakers with audio signal with ultrasound carrier wave... I thought of making a circuit that generates 20/16 Mhz (1.25mhz) square wave? using 4060 ic and 20 mhz crystal and using optocouplers to torn on and off the speakers at same frequency. do you think it is going to work?

Topic by Suraj Grewal  

Help finding lost transponders that transmit at 433.92 MHz and receive either at 307

Hello, I'd like to know if there is a tool finding a small tag transponders that transmit at 433.92 MHz and receive either at 307 kHz? We have a pocket tag reader but it is only good when the tag is within 12inch distance. We have an idea where the tag maybe but finding it is another thing. is there a tool to maybe triangulate the signal and locate that tag that is missing? Thank you for your help!

Topic by batman000    |  last reply

Radio control question Answered

Would putting a 27 mhz frequency crystal  instead of the one shown, and a ajusting it to the right amplitude make a RC work  with this curcuit

Question by jbaker22    |  last reply

Will this motherboard support a dual core CPU? Answered

I'm helping my friend do some upgrades on his computer, it's a Compaq Presario SR2034NX desktop. I'm wondering if it will support a dual core processor or not. According to HP, it doesn't, but looking around on the internet, I've seen quite a few people have upgraded to dual cores. However, there's some minor differences with this particular motherboard. It seems that there are actually two different types of motherboards with the same model number from Asus (A8M2N-LA). On the HP site they have different HP model numbers (a more advanced board - the NodusM3-GL8E, and the one I have - the Naos-GL6; both with the same A8M2N-LA number for Asus) It appears that the NodusM3-GL8E supports all sorts of fun things like 8 GiB of DDR2 800 RAM and dual cores up the wazoo. However, the Naos-GL6 looks like a stripped down version of the NodusM3-GL8E (two less RAM sockets, etc.), so it might not support a dual core. I'd like to know before purchasing, since Newegg won't accept processor returns for a refund. Also, 800 Mhz RAM would be nice to have, HP says it only supports 667 Mhz RAM but other people have put 800 Mhz in with no issues. Does anyone know if my friend's mobo will support a dual core and 800 Mhz RAM?

Question by RelaxedSoup    |  last reply

How to make a single frequency am radio receiver?

I know how to make a 1 mhz am radio transmitter, so now I want to make a 1 mhz radio receiver to receive audio. I would prefer to not have to wind any coils and just make solid state with few components. Do I need to have a coil to receive the radio waves? Also can someone link me to an explanation or explain how I can demodulate with a 1 mhz crystal oscillator. I don't want a link to 'how to make an am radio' I can do that myself. I just want to know A. how to receive the radio signals hopefully without a coil (only using a variable cap?) and B. How I can demodulate using a crystal oscillator. Can I somehow receive the signal using an oscillator like was done with a 555 timer here Links to schematics / pictures of schematics must appreciated? Thank you

Question by sk8aseth    |  last reply

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

Topic by hele    |  last reply

Radio control. Answered

I have radio control radio and receivers from different cars with different AM. They are all 49 mhz, can I change AM by replacing old resisters at  the right spot and put less resistive ones to make it work? Any way?

Question by jbaker22    |  last reply

I am trying to build a Craftsman tool case portabale computer and I need to know how to figure what size PSU to use?

I am using a MU440EX Motherboard from year 2000. I know it is an old board but it has never been opened until today and I know that because I cut the factory seal on it. It says the Pentium 11 processor is supporting a host bus frequency of 66 MHz. The supported Pentium 11 processor have clock speeds of 233 MHz, 266 MHz, 300z, and 366MHz. Intel Celeron Processor supporting bus speed frequency of 66 MHz. The supported Celeron Processor has a clock speed of 266 MHz. As you might already know that it supports SDRAM DIMM * 168 Pin 3.3V DIMMs with gold plated contacts *  66MHz  4- clock unbuffered SDRAM *  non-ECC (64-BIT) memory *  Serial presence detect (SPD) or non-SPD memory *  8 MB, 16 MB, 32MB, 64MB, and 128 MB modules First question- I have a Pentium Processor so will it work without being a Pentium 11 ? I do have a 233 MHz and a 266MHz and I think I have a 300MHz INTEL Pentium 11 Processors so can I put any one of the in it and then set the BIOS for the speed Processor? Would any of them work as long as the BIOS are set to the correct one? Second question is how do I know what WATTAGE of PSU should I use with this system? I have a 230W system with a on/off switch already hooked in to it from the factory that I am thinking of using but I do have a big supply of all different wattage boxes that I can use if it will not hurt it. I don't know how high I can take it. I am getting pic's so I can try and make an Instructable for the first time to when it is done so I can see what all of you think about it. I might be replying back again later when I get to the BIOS part unless I get it done on my own. Cross your fingers for me I will need all the luck I can get being my first time and all. Please answer back with the cold hearted truth so if I do make a mistake that will be the only way I will know it. Thanks to you all GREETINGS TO ALL YOUR HOLADAYS

Question by madrasi    |  last reply

Microcontroller help!

So I'm working on a project to build a binary clock style watch, though I have very limited experience and knowledge about circuitry and microcontrollers. As of right now I have found a relatively simple project on this site I wish to replicate and downsize to fit in the size of a watch. The design of the circuit is based off the layout in this project: I have read up on microcontrollers and microprocessors. I also read some stuff about oscillators and how they can work to essentially synchronize the internal clocks of microcontrollers making them more accurate for clock uses. First is this true that a crystal oscillator can improve the accuracy of a microcontroller? And if so, how could I add a 16.000 Mhz crystal oscillator to the circuit presented above? (I want to use a 16.000 Mhz oscillator because the code written for the microcontroller is based on the 16 Mhz internal clock, so this should line up fine)Thanks if you can answer these questions!

Topic by Tman179    |  last reply

video Transmission wirelessly

Hello, I wonder if someone can help. I need to transfer video wirelessly using basic 433 MHz RF. My problem is the data is more than 5 Mbps and I don't want to use WiFi because of high power consumption and health safety. let me explain it more: 1. The input data is the digital video (5 Mbps) >> compressed using video encoder >> transferred wirelessly. 2. Receive the data >> decompressed using video decoder >> display on tiny uLED screen 91X91 pixel. any one have an idea? Thanks Regards Nabeel  

Topic by NabeelLass    |  last reply

adding an external crystal to attiny85?

How can i add an external crystal to run at 16 mhz to my attiny85? can someone please tell me step by step what to do i have searched everywhere and cannot find the answer. thanks.

Question by fossilshark    |  last reply

arduino Questions

Silly question. Trying to build something that requires an arduino to take a temperature measurement, and pwm an Item dependant on that temp reading. so the question is how many reads and adjustments per second can I aim for? I was hoping to get the 1 MHz area but am assuming less than that at this time

Topic by plucas1    |  last reply

Remote control transmitter and reciver?

I saw a instructable on how to get free eletronics and need the number of a 4 channel variable speed transimtter and reciver (for example 555 is a timer) preferabley 27 MHZ. If you know the part number please post it in comments. Thanks David.

Question by David97    |  last reply

Laser Mouse Sub-Rev Tach

I would like to use a laser mouse as a sub-revolution tachometer. I know that a laser mouse can discern 1 part in 1,000. Some can discern 1 part in 2,000. If you print a ribbon with vertical lines and attach it around a disk you could expose the laser to the lines and create a data stream. I have already found a way to increase the USB polling rate in XP from 125 MHZ to as much as 1,000 MHZ. Though I have tried to find information on how to proceed with my idea, I have thus far found little to help me move forward. Is there anyone on this list with ideas that mght help make this project a reality? This could be data acquisition on the cheap. Really cheap. :)

Topic by nickec