How to make a working colour light signal for model railways?

Hi everyone, I am looking for advice, as to how to make a working colour light for my model railway using LED bulbs? I want to connect it up so I can swich the signal from red to green and vice versa.

Asked by paul Fast post 2 years ago

Trouble using In Line Signal Amplifier

I am trying to install an in line signal amplifier for my satellite, which I hope will increase the signal strength. However, when I finish installing the amplifier the signal is totally blocked. Dose anyone have any ideas on what I am doing wrong?

Posted by Sedgewick17 9 years ago

change old traffic signal to LED and house circuit?

The light is a single 3 light signal. Want to rewire to LED with a variety of light possibilities and be able to plug into house current.

Asked by Needtoknow1 9 years ago

Hey guys I use the USB720 dongle from Verizon for my internet connection. It picks up a signal from cell towers.x

Hey guys, I use the USB720 dongle from Verizon for my internet connection. Lots of time the signal is poor. Would one of thesehelp me get a stronger signal? Thanx, Bob V.

Asked by the hoof 9 years ago

Is it possible to homothetically dilate a signal?

Imagine I have a very short signal that I would like to observe, however the frequency is too high for simply viewing it on an oscilloscope. Is there any possible way to "dilate" it over time? Obviously, I am not talking anything digital, probably some crystal retranslation...  Somehow, I haven't managed to find anything using the most obvious way (googling), but, probably, I don't know how to.

Asked by gruffalo child 4 years ago

Is it possible to connect a usb cable to a laptop Wlan card and attache it to a dish for a stronger wifi signal?

I want to be able to take the mobile card, water proof it. Attache it to the back of the dish, run an antenna from the front also connected to the the cable with a power hookup. The idea is to raise the wifi signal as well as place the unit anywhere in the house to get a strong db. I was in Puerto Rico a few months ago and because the homes are sometimes built into the side of a hill the signals are weak. This challange should be easy but cheap and can be built with things that are availiable.  Broken computers, wires, discarded sat dish and batteries.

Asked by psbcarlos 5 years ago

how do let roomate use signal from my sprint internet card?

Like i got this sprint internet usb and it gives me internet but no one else i have tryed to pick it up on roomates computer with linksys network adapter with speed booster i have two of them and a netgear 54 mbps wireless router wgr614v5 which i plugged into my computer(desktop) and tryed to bridge the signal with my sprint card so i can pick it up on roomates computer with the linksys network adapter but no luck not sure how to do it but would like to know could someone out here please help me wit this signal prob or mabye even suggest a better way of doing this again thank you for listening

Asked by ghost420 8 years ago

I need to remotely turn on and off 55 tvs in school classrooms. How can I build an IR system for this? Thanks, RM

I want to build a hardwired IR network in the school building to each of the tvs. What all components would be needed and how to assemble these components?

Asked by 9 years ago

Model airplane problem

I need help.  My neighbor is dive bombing people on horseback with his model airplane.  He is going to get someone killed.  I've tried to reason with him and have spoken to the police.  I'd like to see if there is a way to ground his plane when it comes on my property while I work on a nuisance/trespass case.  Yesterday he was flying it 6 acres in my property right over people's heads while they tried to ride.  I don't mind him flying it but doing flips etc on my land is unacceptable.  Please help!!!

Posted by Ewindsor 5 years ago

How do you make a tv signal jammer?

I want to know how to make a signal jammer. Thanks! :)

Asked by Zephyr Wind 7 years ago

cell phone signal booster , basements, brick walls?

How can I put a homemade cell signal booster together for my basement apt.? what will be needed for the frequencies adjustment? Can I use an old rooter or ?

Asked by JasonM7 3 years ago

What's the best way to boost the wi-fi signal coming from my wireless route?

My wireless router is in my basement and I have an iPod touch and an xbox 360 that I would like to get a better signal for.

Asked by cbuzzard 9 years ago

Signal strength?

We have a satelite dish on the roof for sending and receiving email. It is called Surfbeam . How can we use the computer to check our signal strength. Our house is settling and they want $100. to send a man up with a meter he uses on the roof. How can we do it. We have electronic knowlege and am an Amature Radio Operator. Please help

Asked by emit 8 years ago

can i increase my internet signal by using a tin can?

I have a inter network established on the outside of my house. But it won't work on the inside of my house. All I can see is the view internet signals available and that network is on there but on the inside of the house it shows limited concetivity. I heard that you can increase a inter net signal using a tin can? Yes I do have a booster but it still only gives me limited connectivity.

Asked by rickeyd412 8 years ago

Measuring a Bluetooth modules output? Answered

There is a serial Bluetooth module that I have used before on an Arduino project but now I'm trying to use in a project without the Arduino. Basically I need it to be an electronic trigger, I don't care really what the signal is just how long and the voltage and current. There are 4 pins on the module: Vcc, GND, Tx, and Rx. There are 2 open pads: Key and State. When I send a command from my phone the module sends a signal out the Tx pin, and it is this signal I would like to measure so I can pick a command with an appropriate signal and tailor the rest of the circuit accordingly. I tried a voltmeter between Tx and GND but saw no signal on any level measuring DC. Is there something I'm missing? Is the signal more complex or different, or is that test setup flawed? I tried other combinations, Rx-GND, Tx-Rx, RX-Tx, GND-Tx, GND-Rx but saw nothing.

Asked by bwrussell 5 years ago

is it possible ?

Can  i import a router wifi signal from 7/10 of a mile away when you have to be within 100 feet to get it on a laptop without any antenna or other aid?   thanks, dsrtdwlr

Asked by dsrtdwlr2 7 years ago

CB Radios and Relay Towers

`A buddy and I have portable Citizen Band Radios and we were kinda wondering what cool stuff we could do with it. Also we want to try and build a simple Relay tower to be able to talk to extend the signal. How would we go about doing this?

Posted by Incelism 10 years ago

I bought one of the Harbor Freight 4 camera video surveillance systems to keep an eye on my driveway and yard.

Two problems arose. 1. Cable distance. "Tech support" says the 'cables' can't be more than the 60' that comes with the system because of loss of signal...( obviously never heard of wires in question are very thin Can I adapt the RCA camera up to exterior coax and run a larger 12V power cord alongside the coax, then convert the video signal back down to the BNC connector and achieve a 'boostable' signal? 2. I have solar panels and 12 volt batteries throughout the property, sheds and garage. Would I be able to just power the camera locally instead of running a power cord from the receiver power supply to the camera?     And.. what's a BALUN? Thanks

Asked by GrumpyOldGoat 7 years ago

hai my rc car receive the commands only when .........................................................?

Hai my rc car receive the commands only when the antenna of the transmitter touches that of the carpls help me to solve this ineed my car to go far?

Asked by liketodrift4 7 years ago

I need a good instructable in the use of Winrar to open a ziped folder fo Eagle. Any help available. kbyrne?

I have the Eagle program. At the cadsoft web site are library parts to download but they are ziped ang winrar is supposed to be used wit this but I am new to computers and have winrar but need a good instructable fo this. I also need a istructable in adding a part from scratch. I have the instructable to add one from a tech sheet. The parts I want to load would be audio integrated amplifiers. thanks

Asked by kbyrne 7 years ago

trigger signal for video line

Hi, I'm having a project which need to send trigger signal to oscilloscope. i should make a circuit that will allow me to trigger oscilloscope on specific lines in a video signal. Please give me some idea so i can go ahead. thanks in advance

Posted by sofia14 3 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

does aluminum foil really affect a computers wifi signal? Answered

Does it, like even have an effect, and can u use it to increase the signal?

Asked by pokemoneg 8 years ago

Mobile phone signal Detector

I want to know if there is any 'mobile phone signal detector' already available in the market. The purpose is to find if anybody is using mobile phone for calls or messaging at restricted places. Jammers are not fine as some are exempted from making calls etc.. If there is nothing like that available, how to make one to detect the signal or even the phone from which the signal was emitted. Usually when we are about to receive a call or sms and if we are near a Speaker we get a specific noise through speaker, or if we are near a monitor (CRT) it flickers.  So I am sure there are ways to find this signal emission. Please suggest the options to do this....

Posted by donjoy 7 years ago

What is sending out the signals ? Answered

Hi, I opened up the remote controls of my old alarm system ( those reed switch ones) hoping to find some IR LEDs. But I got this instead, no IR LEDs. Can anyone tell me which component is sending out the signals ? Thanks in advance.

Asked by fujiapple 8 years ago

Turn Signal Bike Jackets

Looks like Leah Buechley has been busy making even more Turn Signal Bike Jackets. From her Flickr post: on the steps of Shih Chien U, prototyped by me w/ parts from the taipei electronics markets & made by (awesome) Shih Chien University fashion students via CRAFT

Posted by fungus amungus 8 years ago

Logic signal conditioning question?

I a robot i am building, i need to condition the signal as follows with any Microcontroller, only logic gates If 1 is high then  A & C should be high If 2 is high then  B & D should be high If 3 is high then  A & D should be high If 4 is high then  B & C should be high Where 1,2,3&4 are inputs and A,B,C,D are outputs No two inputs will be high a t the same time

Asked by qwerty156 6 years ago

Send and receive an electric signal...? Answered

Hi everyone,I just wanted to know how I can send a small electric signal over a distance(not more than 10 meters)wirelessly and receive it at the other end to trigger a relay which in turn of course.. switch higher voltages and do something say...light a LED.I don't know much about frequencies,oscillators and FM/AM or anything.So please let me know how I can get an idea about these and most importantly accomplish what I just mentioned above.

Asked by Adarsh_tronix 5 years ago

How to boost a sawtooth signal?

Hi, I need to make a sawtooth generator based on an NE555 (the power supply will be 15 volt - 5000mA), and I need to boost the output signal as follow: Which needs to go from 9.6 volt to 14.10 volt with a 3000mA current. I've found a schematich, but I don't know if is valid: Would be a viable way, using this schematic, or there would be a better/different solution? If so, someone could suggest me another schematic or tell me how to modify the one which I posted? Thank you.

Asked by akopelumenuscu 2 years ago

Is it possible to build some sort of wifi signal relay station? Answered

I have a linksys Wireless N router which doesnt seem to have the power needed to reach all corners of my house... It also has no antennas (and i don't have money at all so a wifi usb thing isnt an option) so none of the guides here about wifi boosting dont really work. So i had an idea about how to fix this but had no idea how to implement it.... Here's my idea: build some sort of relay station to extend the range R=router @=relay L=Laptop )=signal R) ) ) ) ) ) ) ) ) ) ) ) ) ) @ ) ) ) ) ) ) ) ) ) ) ) ) L Is this possible? I have an old linksys router with two antennas if that helps

Asked by quellek2 7 years ago

I need some expertise! Deals with LED/LCD and transferring/ displaying voltages !

Here is the situation, I need to send a variable signal from box 1 to a digital LED/LCD display on box 1 and Box 2. Here is the hitch the signal sent from box 1 has to vary, as well as indicate to Box 2 a different setting (a different measurement scale) It doesn't actually have to measure anything just be able to send a setting that changes the "measurement setting" on Box 2.  Hope this isn't too confusing I am looking for ideas/ specifics on parts and places where to buy them. ThanksQ

Asked by jlkeiser 7 years ago

Can someone Explain to Me how Wifi Antenna Extenders work? Answered

Could someone help explain to me How wifi antenna extenders work? To me It seems like you would be able to send packets to the network, but it wouldn't be able to send them back, making the TCP/IP Handshake Incomplete.I am Talking about having a USB wifi Adapter with a Pringles can antenna or something like this: (, and using it to connect to a Starbucks or something.I get that the metal reflects the signal, so that it is strengthened, and can be pointed towards something, What I Don't get is how once you send the signal, how does the signal get back to you when your out of the routers range?The pic is a rendition of what I think should happen, while using a wifi-extender antenna trying to connect to another place's internet that would usually be out-of-range.

Asked by Jordo 8 years ago

How can I boost satellite internet signal for laptop housed in building located fair distance from dish

Hello. First time question-poser. I need really basic information (no freaky-tech-talk, please). How do I summarize? Dial-up, broadband through cell phone provider, DSL ( although discovered our location is too far out), and now satellite internet through Hughesnet. Iffy at best. Here is my dilemma: I need to boost the satellite internet signal for my laptop that will be located in my new handy-dandy office (when it is finallly constructed: a month or so) on the back of the property? Haven't measured the distance but more than a hop, skip, and jump. More like 100 hops, skips, and jumps. May have old Dish dish as was a suggestion on a page that I can't get back to now that I am officially a member, thank you very much. I know way more about this internet thing than I want and not enough to help my situation. Any suggestions would be greatly appreciated.

Asked by mimsk 6 years ago


Hi all dear friend i am a wireless cable services provider please help me how can i strong my service note i am not a rich man i am poor man thanks for all brothers

Posted by hearthunter4gf 8 years ago

I need some advice with a transistor in a turn signal circuit. Answered

I am working on a turn signal system for a recumbent trike and it isn't working correctly. It's based on your basic 555 timer to provide the flashing. An on-off-on toggle switch will select left or right. I didn't want to be running the 555 timer all the time so I thought I would power it through the switch. D1 and D2 ensure the timer is powered when left or right is selected while only energizing the correct transistor. The visible LEDs will be dash panel indicators and external light clusters will be connected to the jacks. The problem I am having is that both left and right lights flash with the switch in either position. I'm pretty sure that the 555 is actually powering both indicator LEDs on it's own through the bases of Q1 and Q2, instead of just switching them on and letting the current from the switch do the work. I only had generic transistors hanging around and I'm wondering if using MOSFETs would solve this problem? My understanding is that they would not conduct enough Gate to Drain current to power the LEDs.

Asked by AnotherBrian 8 years ago

HELP! I want to extend my wireless signal! Answered

  Can I simply get an old router and connect it to my laptop, which is already in range of the signal? Would that allow the laptop to take in the signal and spend it back out, stronger?

Asked by sjo232 7 years ago

Wireless Turn Signals

I have toyed around with the idea of making a jacket that has the turn signals and/or brake lights on the back. However, there is a twist, I would like to see a controller box to wirelessly send the signal from a scooter to the jacket. When the turn signals and brakes are used on the scooter it sends a wireless signal to the controller in the jacket which relays that to lights on the back of the jacket. I've seen some jackets with lights wired on to them controlled with an arduino.

Posted by partyone 8 years ago

Do Laptops have a "Power On" signal?

I was thinking of trying a project in which I do a custom watercooling setup on a gaming laptop of some kind. I would like the loop to power on and off with the laptop itself, but I don't want to use USB power or something like. That made me wonder if laptops have a power on signal, like desktop psu's have. Do they have it or something similar to a power on signal?

Posted by Dashing Rainbow Dash 1 year ago

Need help with signal generator 5kHz and 8.7 kHz

Hi, I'd like some help. I'm trying to make a simple signal generator that will produce a 5kHz and an 8.7kHz square wave signal. I have some basic (very) electronics skills, and know how to follow a schematic and solder things up. The ones I've found online are outdated, using obsolete IC's. Any help would be appreciated. Thanks in advance.

Posted by NorthWind 7 years ago

Adjustable, bluetooth, etc.

I am trying to figure out how to control a device that will be "off" while in the range of a transmitter (short range...under 10ft) and then turn on when it goes beyond the range of the signal. I would also like it to be an adjustable range. I was thinking the device would be "on" constantly as the transmitter tells it not to activate, but once it leaves the signal range it would activate.  Any thoughts? Thank you in advance.

Posted by milkyway312 3 years ago

Dir-300 as Wifi repeater

Hello, I have an AP in my house which broadcasts our wireless Internet signal throughout our house. Unfortunately there is a spot in my house where the signal is not received. I have a spare dlink dir-300 router which I installed custom firmware on (dd wrt). Can someone please help me use it as a wireless repeater. I want it to boost the signal of my other router. Dd wrt has a repeater function, but my router is an atheros chipset so it is not native on my device. P.s: I don't really want some cheap wifi booster made of tinfoil :p . Thanks in advance, Sam

Posted by Bituser 7 years ago

Is it possible to make a range extension antenna for my cell phone? Answered

So my job has me out in BFE a lot where I am lucky to get 1/16th of a bar of service. I was wondering if it is possible to increase my signal gain by building an antenna for my cell phone that plugs into the port under the cover? 

Asked by atrumblood 6 years ago

Useless WorldSpace

I have a worldspace satellite reciever lying around at home. I'm from India and WorldSpace service in India has been stopped due to low profit. Now that reciever set and the antenna thing are thrown around useless. I wonder what I can do with it? And is it possible to make a mobile phone signal booster with it??? Or any other idea, anything??? 

Posted by pro2xy 7 years ago

Cell / mobile phone signal relay.

I work in a building with a metal roof that is also in a small valley. We have absolutely no reception inside the building. Outside we have about 4 to 5 bars, inside there are none. Maybe one if you are near a window. The building is mainly one large open space on the side. I was wondering if it might be possible to passively "pipe in" cell phone reception. I was thinking of a large antenna on the roof that would be connected to a smaller antenna affixed to the middle of the ceiling of the main room. I know the antennas would need to be tuned to the correct bandwidths and I would need a little help with that. (Our carrier is Verizon in the USA btw). Would this sort of setup be feasible?

Posted by Jarun 3 years ago

Help With CB Radio Alignment & Tuning

I'm wanting to tune and align my own CB Radio but have found that some expensive equipment is required. However, it looks as though it may now be possible using a computer and Oscilloscope and Signal Generator software downloaded from the net. My problem is I have never used such equipment let alone connect it to a computer then use it. I see that cheap Signal Generators etc are available on the net but am not sure which one would suit 27mhz.. Looking at making my own where possible but admit I'm fairly new to electronics etc. For a better idea of what I am wanting to do please check out this link I'd appreciate any help or advice re this.

Posted by RockQ 2 years ago

off relay with delay on timer

Hello smart people! I need to pick your collective brain. The project that I am working on is on my car. I am replacing the front turn signals on my car with an LED strip. The led strip has three wires. One for ground, one for white LEDs, and one for the amber LEDs. If it is just directly connected to the current incandescent bulbs, the white comes on as a running light. When the turn signal comes on, the lights flash white, amber, white, amber..... (not what I want) What I want it to do is turn off the white while the amber flashes, then turn the white back on. I have a delay on relay, but that won't quite work for what I am trying to do. Isn't there a way to just throw a cap and resistor to keep the voltage on a relay to keep the white off till the amber is done flashing?

Asked by DanielB93 2 years ago

Help on VU meter?

Well I want to make a stereo Vu meter for my computer. I want it to be stereo but dont know how to do that. Im planning to cut a headphone to get the audio jack and thats stereo so how will that go into the scematic. (excuse the spelling its late)

Asked by sunny342 8 years ago

Volume control before amplifier? Pot range...?

Building a powered sub woofer. Enclosure and mounting comes along fine, in 2 days I'll get a 100 W RMS Velleman kit. I will only connect it to the sound card, and sometimes to an MP3 player, in which case I will split the signal in 1 or 2 stereo plus one bass channel. I have noticed very different volume levels in the bass register of various recordings, sometimes even damaging (to my other, portable bike sub woofer).  The new, yet to build amp is even more overrated in respect to all the other, separately amplified sound system components---  So I need a volume control potmeter before the amp. What is the range this potentiometer should have? (right now, I plug it in the CD RCA input of another amp)

Asked by BobS 7 years ago

Direction/turn signal indicators making them brighter with led bulb I need help pls

Hi. I somtimes ride a 1985 yamaha ms50 pogal 50cc moped. It has an 6v electrial system where as modern day scooters are 12v. I bought a knew indicater relay for it and checked all the bulbs as the turn signal indicators are not so easy to see flashing. I mean, on average sunny day other road users would need to look hard to see them flashing. the bulbs are 6v 15w and both old and knew flasher relays gives output of 6v 40w. I would feel much safer when turning if I had a bulb that gives a brighter flash to give other road users a better idea when im turning. I can see on the web there is a 6v 5w and 10w bulb I can try or even 6v leds but I dont know much about leds. the stanadard factory fitted indicater buld 6v 15w gives an ok flash at night, but in sunny daylight I would need to be close up to see it flash which is no good! I don't want to change the originality of this little ped since it has been carefully taken care of over the years and has made it in intact into current times as is. I need to come up with somthing that will work and if I replace a buld with a 5w or 10w when it should be 15w I may get a brigher flash or just blow the bulb. I wonder was there a problem or just bad design with the indicator lights on the yamaha ms50 pogal when they first came out in the 1980's as I have seen a couple of them fitted with suzuki fz50 indicators and other makes of bike turn signal indicaters on them. I don't think the flashers are faulty I feel they where just made that way. I could be wrong. I suppose there could be a bad earth on the flashers. Sorry to go on so much about this. Im looking for your suggestions for a brighter indicator flashers which is purely for safety reasons. If car drivers can see where im turning, im less at risk of being nocked off by them. Im thinking a higher or lower wattage incandescent 6v buld or even a replacment 6v led buld ive seen on ebay but as I said. I know nothing about led bulbs or even if they will work on my moped. Would a equivalent 6v 15w led give a brigher flash than a 6v 15w tradisional incandesant bulb? can someone help me here pls Here's the led ive seen on ebay these are the standard 6v 15w bulbs i want to replace with brighter led bulbs  

Posted by selectauto 4 years ago