Crystal Shortwave receiver

Help!! On how to make a crystal shortwave receiver. Schematics, picture diagrams, parts list and building instructions will be greatly apreciated.

Posted by Jezan 9 years ago

USB Infrared Receiver for PC

 I have been wanting to build a USB Infrared Receiver because I do not have a serial port, and I do not want to use a USB to serial. What do you all think of this idea?

Posted by colton.asu 8 years ago

IR receiver and output over short distance

  I want to set up a short distant IR sensor(<1"). I just want it to register when something is between the two items. Its a pretty simple circuit I just have no experience with optical receivers. Any help would be greatly appreciated, thanks  

Posted by stino66 6 years ago

Problem with wireless bell

I am in confusion. Actually i have a wireless bell but of shorter range. So i thought to extend its range. I want to add one more pair of receiver and transmitter in the way. So when bell button is pushed, transmitter will send to receiver and receiver will complete circuit of transmitter and another signal to other receiver of bell. So it will double the distance. If it is possible kindly help me out. I am new in this field so explain me and tell which parts i need to buy. Thank you.

Posted by RollingS2 10 months ago

how to make this device?

Hi, i want to make a device, please tell me how... there is something that looks like a tv remote . it has 9 buttons on it. And there are 9 light bulbs. when i press each button, each of the 9 light bulbs should light up. for example, when i press button 1, light bulb 1 should light up. when i press button 2 , bulb 2 should light up, button 3 turns on bulb 3, and so on. this needs to be wireless. i have done some research and i have found that i need something called an RF transmitter and RF receiver. I just need some hints on how to make this device. i hope it is clear what i want , english is not my first language, if its not clear let me know and i will clarify.

Posted by create90212 10 years ago

TV receiver

Is there a way to receive TV audio signals similar to radio receiver signals?

Posted by kprasann 8 years ago

Does anyone Identify this IR Receiver Component?

I recently disassembled a stereo receiver (rx-4010r) and I found this ir receiver, and I would like to to control it with my arduino. Can anyone help me get the datasheet, or suggest what are the connections?Thanks, Ariel.

Posted by ArielE20 2 months ago

What would be the best IR receiver for 980nm IR laser 0-15KHz

Dear enthusiasts, please help me out. What would be the best IR receiver to use for detecting signal from 980nm IR laser 0-15KHz. I'm going for distance here. 200 meters is more or less the goal. The further the better. Ambient light might also be an issue as this is to be done outside in possibly sunny conditions. If anybody has any ideas or suggestions please, throw them out here. Thanks.

Posted by GusevAnton 7 months ago


Hey everyone does anyone know any good ideas for making a portable ham radio transmitter and receiver that can fit inside an iPhone case (the cardboard case you buy them in)? It would be good if it was a kit, but it would be better if it can be made using a breadboard and other bits and pieces. Anyone have any ideas?

Posted by simonyu 5 years ago

Best configuration for an AM receiver?

Hi all. I am trying to make a circuit that would help me find lost keys. It would be a simple beeper/ noise maker triggered by AM (for simplicity). I want it to be small and, if possible, cheap. What would be the best approach? Should I use the incoming signal to 'trigger' a 555 oscillator or should I send the 'beep with the signal (The transmitter can be as big as required)? Also, most of the circuits I found online were for tune-able radios. If I want to center mine at 1 MHz and if the quality of the sound is not important, how simple can I make the circuit (while still keeping it sensitive)?

Posted by utkarshsinghal 4 years ago

Remote Control

Hello people! I was wondering if anyone knows how to hook up a computer to a remote control from a bluray, so I can do stuff with the commands from the remote.

Posted by Game Maker 4 years ago

RC transmitter/receiver technical questions

I have a few questions regarding the data rate of normal RC transmitters. Roughly how often does the processor in the transmitter scan the inputs? Each individual channel only operates at around 50/60 Hz, can this easily be increased? I've heard that there are digital servos operating on a frequency significantly higher than 60Hz, do they still operate on the same 60 Hz input? How noticeable would a refresh rate of 5Hz be in the position of the servo when it is in use on a performance model (i'm told that a program the executes in 1/10th of a second appears instantaneous)? Can a 100% duty cycle pulse be supplied to a servo to make it move faster, if the correct position signal is supplied when it reaches the right place? Thanks for any replies. (does anyone know where to find the pinout for the nvidia gt330m graphics card)

Posted by The Skinnerz 7 years ago

FM Wireless Microphone receiver

About a year ago I got one end of an wireless microphone system at a yard sale. As far as I can tell, it is the sending unit. The recieving unit is lost to posterity, which is why it was so cheap, and has since been collecting dust. It has an RCA line in, 1/4 inch microphone in, a squelch knob, an output knob, a two-foot antenna, and a power button. It says it operates at 49.83MHz FM. I don't have a receiver that will pick up that frequency, and I'd like to know what it would take to build one. Perhaps mod an existing FM radio?

Posted by Rishnai 10 years ago

FM Transmitted Music: iPod --> Receiver

I'm working on a total customization of my bicycle, and just had to have some speakers. My iPod's earphones are a bit finicky when it comes to moving around with them, and really constricts my hearing of cars, causing me to not be the safest rider. Now, I've tried hooking larger speakers up to my iPod (a few topics on that), but the iPod simply couldn't power them, causing me to need an amp, etc., etc. I'm hoping I've found what I need with this subject. Could I build an FM radio transmitter, to be hooked up to my iPod, and receive my music with a sports radio I have? Would my music be louder, since my radio plays loud? I'm sure I could build the circuit, but it is the technicalities I'm worried about. Thanks!

Posted by Bran 10 years ago

Help on R/C plane workings

This is my first time on the site and first time with trying to build a rc anything.  My mind is so scrambled due to constant searching online and I still don't know where to start. First, I thought of building a brushless motor.  Seeing some online looks awesome.  Just some wire, rod and a magnet to a battery.  But I do not know the size of battery nor  how the size of the wire will change my project. Second, it would be fun to have my PS2 controller, control the heli or plane I choose to build. Is this possible. Third, can I use a motor from a cheap heli in a plane and have control over the speed? Lastly for now, is there a way to figure what motor I need if I was going to build a slow flyer vs a outdoor micro flyer?  I have been looking at weight mostly and don't know if I need to be that concerned. Please help if you dare to take me on as a challenge case.

Posted by Todd M 4 years ago

Make any pair of headphones wireless.

I need to reduce cords on my device, as much as possible, for a project I am working on. I really would like to convert this device from wired to wireless. First I will explain the images, then the 2 ideas I have.First image "before" = A device with a long headphone cord.Second image "after" = Idea of solution #1.Third image "better" = Idea of better solution #2.---Idea #1 - The less-preferred method.For this idea, I'll need to cut the cord with a pair of scissors and rewire the ends to eliminate the excess cord, to achieve the results in the middle image. So How do I go about doing this? And is there a better way?---OR---Idea #2 - The more preferred, long-term method.Observe the third image (idea #2). Is there any way possible on this earth to achieve this? I think it is absolutely crazy that I cannot find this kind of device anywhere on the market yet, in our day of technology.Thanks for your comments!

Posted by jabcoolman 10 years ago

IR Receiver

I recently ripped apart a Sky+ box that was out of use. Of course, it contained many parts. Quite a few tact switches, a few LEDs, a lot of capacitors, lots of resistors. One of these parts was a little metal cube with a black sphere protruding from the front of it. This is the IR receiver for the remote. I wish to incorporate it into another project. The first problem is I don't know how to use it. It has 3 "legs" - 3 metal contacts. The second problem is I can't easily experiment with it as I inadvertently destroyed my breadboard earlier. A new one will come as soon as I can manage, but until then..... My question is this - any ideas how it would be used? Thanks in advance,     ~H4ZZ

Posted by __DELETED__ 7 years ago

Possible project with 433Mhz RF Transmitter + Receiver Module Link Using multiple analog sensors

Is it possible to send multiple sensor readings via through a 433Mhz RF Transmitter + Receiver Module Link?..Meaning, assume that I have a three Flex sensors on the transmitter side and three servos on the receiver side. I have the project almost complete however I would like to make it wireless with these rf modules. When you bend a flex sensor its corresponding servo motor will turn depending on how far the sensor is bent. I do not know if this is possible using these modules since there are multiple flex sensors and they are analog (I'm not sure if analog is the correct term but what I mean is since the sensors will output an array of values I don't know if it will work since its not digital) If anyone knows if this is possible please let me know and also if you can I would need help with the code, I have never made anything wireless before but it seams really neat. Thanks to all those who reply!

Posted by Daniel Quintana 2 years ago

Micro quadcopter circuit board as flight controller and receiver?

I have a little airhogs quadcopter. A motor had died in it, so it doesn't fly anymore. I kinda got the idea to connect ESCs to the motor output of the quad's circuit board. Would those motor outputs be able to drive the PWM input of the ESC, allowing the board to basically drive larger motors?

Posted by Dashing Rainbow Dash 1 year ago

Help with Bluetooth Music Receiver

Hi everyone. I have this problem I don't know how to solve. Recently I bought a Linocell Bluetooth Music Receiver to plug in my car. I wanted to rip away the battery and make it to turn on when I turn started the car. The problem is that the On/Off has two functions: 1. The obvious On/Off function (holding the button for 3-5 seconds) 2. Search mode (holding the button for about 10 seconds) How and what do I modify for it to work the way I want? I can upload a picture of the circuit board if it helps.

Posted by homan 3 years ago

Wireless charging of smartphones anywhere within a 30 foot radius, without-pad !

Just read there is a 10W transmitter IC that has been developed to power a receiver IC collecting 6W of that energy... Both are ASIC chips that can operate and power power mobile devices up to 30 feet apart. Even though the RF energy is deemed safe. I would plan on using a Faraday helmet and maybe lead under wear when next I visit a coffey house.

Posted by iceng 2 years ago

3ch rc ciruit board

I would like to build my own rc airplane. I already know how to build the fuselage and the wings. I also have the landing gear. I have a 27mhz rc circuit from an old rc car. The problem is the car was only a 2ch board. I need a 3ch transmitter and receiver. (Throttle, left/right, up/down). I'll be honest, I don't know much about circuit boards, but I can learn. Does anyone know how to make the circuit board for this, or where I can get a custom board made for me?

Posted by popit 8 years ago

Tetrahedron Antenna

Hello I have a question about an idea I have for an antenna that always points to the sky antenna no matter how it lands; this is for a high altitude balloon. My idea was to make an antenna the shape of a tetrahedron, so that one antenna always points up. Does  having 4 antennas diminish the signal from the transmitter at all? Thank you

Posted by sdtacoma 7 years ago

IR Cake.

Hello, Some friends asked my wife to do a birthday cake for a girl of eight years. With her ‹age she is crazy about princesses. Well, what came to mind was that despite having done many projects with Arduino i had never applied electronics in a cake. So we decided to join forces and add some light (RGB LED) and movement (DC motor controlled with an L298) to the cake. Here is the link to the video:;

Posted by pmartins4 5 years ago

I don't receive e-mail

 I received the emails in a normal way, but I stopped receiving nothing. The settings are in the image below.

Posted by mtsys 1 year ago

Need help with RF related circuit and microcontroller code, feel free to produce a colaborative instructable(or one on your own i don't mind)

Hello all who cared enough to move your mouse anywhere near the link to this post and clicked (100% of you who ended up here fall into this group.) I had an idea while hovering around the limits of wakefulness and sleep. using a microcontroller, some switches, an oscillating crystal, a battery and an antenna, we make a type of transmitter that when activated plays a series of bleeps according to a code in binary (i'm thinking that when the current goes to one pin, redirect to positive of crystal for on/1 then a grounded pin for off/0) and on the receiver end, it's basically an antenna, small transistor radio locked to the frequency of the crystal (AM preferably,) a decoder chip (microcontroller) and a relay to complete the circuit so that whatever is needed to be done remotly can be done whether it be disengaging a magnetic lock, switching lights on/off remotely or even setting of fireworks remotely. thanks to all who post a meaningful reply!

Posted by Tobita 9 years ago

not receiving emails

I have updated my email address but I don't receive any email's from your site anymore

Posted by ctfiene 9 years ago

Question about receiving prizes

I won a prize in a contest recently. I received a message saying my prize was being shipped out a little over a month ago, but I have yet to receive it. What is the average time to receive a prize after it has been shipped? Thanks

Posted by Crazyffrey 4 years ago

Not receiving any email updates

I have stopped receiving any email alerts since 02.07.2009 - have in the interim periodically checked the site, but would like to receive the automated alerts again. Have not changed email address nor have I deliberately or inadvertently modified any of my account settings.

Posted by dhugall 8 years ago

Never receive my prize

Hi I was a winner (First 5) of the cardboard contest. I already received the instructables prize with my robot t-shirt.  Thanks it is great :) A few weeks ago I received a mail (not email) from Fedex describing the sending of my prize. I'm surprise to see that it mentions the sending of the prize "Three Month HowToons Subscription". First because I don't received this pack, I only received the tshirt from instructables (thanks it is great). And also because I'm in the First(5) winners and it's normally six month HowToons subscription and not three. Could you please tell me if I will receive it? Thanks for your response. Have a good day

Posted by miniil 1 year ago

No longer receiving email updates

Suddenly I am no longer receiving emails when someone leaves me a message or posts on an instructable I am following etc. I have checked all the settings I know. Maybe I am doing something wrong, but it doesn't look like it.

Posted by SuperTech-IT 4 years ago

Received confirmation, but instructable never showed up in contest

I received an email yesterday telling me my instructable "Bookcase with dog parts" was accepted in the Pets Contest, but so far it has not showed up.

Posted by knife141 6 years ago

Contest entry received but not shown

I entered an Instructable into the teacher contest and received an email confirming my entry, however the Instructable is not listed in my Recognition section of my profile or with the other contest entries. Thanks for looking into this.

Posted by LanceMakes 6 years ago

IR (infrared) "motion detector" of sorts, need help please

I am looking to build a sort if motion detector that works with 2 IR emitters, 2 IR receivers and a motor, the emitters and receivers would be  in 2 seperate circuits and lined up with eachother  (the emitters constantly on) and when the link to the receivers was severed (for example by someone standing between the emitter and receiver) the motor would rotate, if the left emitter-receiver combo was disrupted it would apply positive voltage to the motor and if the right emitter-receiver combo was dusrupted it would apply negative voltage, is this even remotely possible? Firezone

Posted by firezone 8 years ago

Not Receiving my Feed Email - HELP!

For the past 2 months or so, I've been receiving my Feed email from Instructables only 1-2 times per week, Instead of 7, Like before. I'm following more than 400 members, And I do not know why this happens. Does anyone know? Yonatan

Posted by Yonatan24 2 years ago

DIY spy earpiece

PLEASE HELP! THANK YOU I want to make a SPY EARPIECE, like a hearing aid with an battery inside,a kind of electromagnetic receiver,that will work with an inductive neck loop set. It is too expensive for me to buy one. Another possibility is using a bluetooth neck loop set. It should look like ear pieces on these websites: Thank everyone who participates in finding out the needed plans to make one and technical plans

Posted by e_nysa 8 years ago

Oh noes! I stopped receiving email!

Last night I received a rush of emails due to my new iBle. Suddenly, they just stopped. I was no longer receiving emails from Instructables. This was confirmed by several un-emailed replies to me and one of my forum topics. I rely heavily on the email system to tell me when someone is contacting me, as the text box on my homepage does not always show new comments. If you think I stopped receiving the emails because the rush triggered an anti-junk system, I have no such system set up (because I don't get junk mail :) ) and I have received a much larger rush of iBle emails in the past. I tested to see if it was my email by sending a message from a separate computer/account, and I received that message. I also still receive emails from Please, fix this. I'm lost without it! Edit: Fixed! :D

Posted by Spl1nt3rC3ll 9 years ago

Not receiving email digests anymore

Up until January I was receiving twice weekly digests of featured instructables delivered to my inbox. I'm not getting them anymore and can't find out how to reinstate that. They were the high points of my week. Any ideas how that can happen again?

Posted by mjursic 4 years ago

Arduino GPS/GLONASS/Beidou Receiver

Http:// This Arduino board with GPS/GLONASS/Beidou looks interesting. What is the advantage of having GLONASS or Beidou? Although my phone only has GPS, but seems works quite well finding places.

Posted by tinkerboy9 4 years ago



Posted by 646433 9 years ago

Password reset emails not being received

I'm not receiving emails to reset my password when I request them. I do get other emails (notification of group add requests, patches being sent to me, etc) from robot regularly. I don't have a spam folder.

Posted by Lithium Rain 8 years ago

Received request for my physical address to qualify to receive an animated holiday card. Is this Legit? Why know physical address for this? Anyone else get one of these notices?

I received a notice from with request that I identify my physical address to qualify to receive an automated greeting card...???  Is this legit? Why do they need to know my physical address? This really sounds odd to me.  Anyone else get one of these kinds of notices?  I really LOVE   Its awesome fun for those who like to do projects not just talk about them.

Posted by BudBump 5 years ago

how long does it take to receive prize from a contest

I won a BBQ cookbook in the low and slow BBQ contest almost 2 months ago and I'm trying to figure ou how long it takes to receive the prize.  Hope there wasn't a mix up or anything

Posted by Mhbaben 8 years ago

Rf motion sensor connected to USB receiver

I am JUST getting into home builds and i want someone that can help me or make one for me.. I want a motion sensor device that can send a signal to a USB receiver.. I then want the usb receiver to inturpert the signal and do something .. - like open or toggle a program on that computer... ultimately it would be a cubical boss alert device.. when it detects motion it automatically flips my application! :) Any takers? Ryan

Posted by rmwilson 11 years ago

received free 3 month membership

Received free 3 month membership , signed in ,went to setting  but could not find where to put my code to redeem it. it shows redeem then I have to sign in again but stuck in a loop .Brings me back to the beginning , don't see where I can put my code in.

Posted by LarryF29 11 months ago

Robot is having issues with subscriptions

I subscribed to MissBetsy shortly after her steampunk keyboard was posted, and I have received two subscription updates about it. I have also received two or three updates for NachoMahma's Answerers group. I then received 7 blank messages from Instructables Robot between 15:10 and 15:34PDT.

Posted by CameronSS 8 years ago

Didn't receive my 3D prints :(

Hi,I had emailed the required stl files 2 months ago but didn't any shipment confirmation message :(

Posted by rahulkar 5 years ago

Re-design receives 500 Best Answers

.  Re-design has been awarded Best Answer 500 times! Congratulations. Patch has been sent.

Posted by NachoMahma 7 years ago

Newsletter patch never received!

Hello! My Instructable was featured in the April 7th newsletter under a modified name (Look for "Portable Rickroll") but I never received a newsletter patch! I know that this is kind of ego centric but could somebody see if I was supposed to get a patch? I really like patches! They are like achievements for! Many Thanks, -XtremD

Posted by winterfresh 7 years ago

Not receiving any replies notifications in the forum? [FIXED!]

I am just wondering why am I not notified when people reply on my comments in the forum? Is there a way to enable it? [EDIT] They just fixed the bug! I just received 180 notifications at the same time! :D  Thanks instructables team! Keep up the good work! :)

Posted by Electrospark 3 years ago