Search for inputs in Topics


Comparator Inputs ?

On the two inputs of a standard comparator op amp (say for example  LM741)  they usually  connect resistors from both the positive and negative voltage rails .Why do they do this and how does this work . This has been on my mind for a really long time . Could someone give me a really detailed explanation maybe with images if possible , cause this would be really helpful in the building of my next project .Most of the tutorial videos out there , i don't understand either. Thank you in advance  

Question by Strontium    |  last reply


Motor As Input?

I want to use a hobby motor with arduino as input , do I connect it directly or I need some circuits? Thanx In Advance!

Question by Bot1398    |  last reply


transformer input Answered

I have a transformer with 13v input can i give it 240v without it melting and can you please tell me the math of transformers  am new and any information helps

Question by mohamed amin    |  last reply


Arduino Input

I am writing an Arduino program to read speaker inputs for a test station.  I need only to know when a speaker lead is on or off. This will be done by using the fade and balance.  Originally I was connecting the speaker leads to the analog inputs and could get a single line to work as a simple VU meter. Multiple lines gave issue.  Since I don't need to know the actual level, just whether they are on or off I'd like the speaker lead to trigger a transistor connected to a digital I/O pin on the Arduino.  Any thoughts or quick schematics on how to do this? 

Topic by dbirky    |  last reply


search input

Over a year ago I searched for "Swamp Cooler" in Instructables.  Ever since then, no matter what I search for, the search data is erased and "swamp cooler" is automatically entered.

Topic by wlgoode    |  last reply


Just want to know more about inputs on the cpu?

On the HP Pavilion Laptop and theToshiba Satellite Laptop i wanted to know what inputs do they  have and what are thier uses,which laptop would be best for online classes??

Question by tjazznx    |  last reply


Microcontroller inputs in C language?

I'm having problems finding and figuring how to do inputs with mirocontrollers VIA button press >> led goes on.(I have a ATTINY2313)Outputs are as simple as PORTB = 0x10 (being hex for pin 16). Keep in mind I'm very new to micros and C. The most I've done was fast-slow blink patterns. How can i do inputs though? SIMPLE code sample is welcomed!

Topic by Killa-X    |  last reply


What is the code needed for having an arduino desplay inputs from sensors onto the computer screen? Answered

I require some code for an arduino so that when i use a sensor the inputs from the arduino can be monitered from the computer screen

Question by MadScientist101    |  last reply


WHICH IS INPUT AND OUTPUT OF THIS? Answered

Tbd392nr lcd inverter

Question by yhdesai    |  last reply


Sheet metal input

Fixin’ to make to magnetic board and need some input on what to purchase. I’m seeing several types of sheet metal. There’s plain sheet metal, zinc plated, cold rolled, weldable, galvanized, etc. Is there a particular type I should purchase? Hoping to avoid anything that will tarnish or leave marks on any paper out on the board. Thank you for your input!

Topic by jpmarth    |  last reply


Audio input switch

I need this simple device, because i have two audio interfaces (one for guitar recording and one for vocal recording) and when i change audio interface i need to disconnect output cable, of first interface, from my monitors and then connect output cable from second interface to my monitors. So with this I can choose between two different stereo audio inputs and send one of them to output. I am using TRS connectors, but i will also need XLR version of this. Check out this picture:

Topic by Necrofenser    |  last reply


Waterproof charging input?

Hello everyone, I'm new to electronics and while I can usually find what I need by asking good ole' Google, I decided to try asking a forum of people more knowledgeable on the subject. My question relates to the charger input on devices with internal batteries. I have a Braun razor that can be used in the shower, and I was curious how it can go in water with the two charging prongs exposed? Thanks in advance! 

Topic by alpizzles    |  last reply


Use Output as Input

Hi ! I have this program, Finale 2005b. I've searched everywhere, and I cannot find any way to export the music I produce in there as a real audio file (NOT a midi). So, to achieve this, I have decided to record the output as the input... using Audacity , actually. To do so, I used a simple mono cable to go from my headphone to mic plugs, and set the volume to the minimum... to avoid too much amplitude going in. Now, for the use I want it, this method is way too dodgy (plenty of interference, specially each time I move the cable 1 mm...) I'm pretty sure there is some program or solution to directly map the stream around... I don't have much funds, so free would be good, and btw I work on Win32. Thanks

Topic by fxsapa    |  last reply


Rotary input for a cellphone

I have an idea to do a total conversion on a cellphone, including things like a steam-driven charger, etc. The issue I am running into here is if I could, I'd want to make it rotary. I saw Randofo's PIC method for making it a USB input here but I have no clue in terms of how a cellphone works, or any of the chips involved. Sadly, my knowledge is mechanical, not circuitry. Any sort of ideas are welcome... please help me progress on what I hope to be my magnum opus of steampunkerie.

Topic by Harlequin    |  last reply


Vu meter input? Answered

Well I want to make a stereo Vu meter for my computer. https://www.instructables.com/id/SOCKO0TFI36FRXJ/ 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)And does anyone know if i can find the ic at radio shack

Question by sunny342    |  last reply


parallel port input?

Plz help me to, how can i receive signal or instruction from paralel port, how should i send current/signal to its register. what equipment should i need. actually i want to develope a system in c language to control electricity of home, doors or widows, so i need to check that if the door is open or closes. when door closed then computer should indicate me that the door is closed, and same door has opened. sir plz give me guideline. i would be very very thankfull to u. ( simply tell me how current/data/signal can be sent through parallel port, current source, equipment ets, after that i will make sensers for it my self)

Question    |  last reply


Operational Amplifier input voltage affects other input?

Hello, I have created a simple circuit where 2 10k resistors make a voltage divider. Supply voltage is 12.5V and if I measure in between the 2 resistors, I'm getting 6.3V. Great! Now I connect that 6.3V to the +input of an OpAmp. Result: the value is still 6.3V. Great! (The OpAmp is also fed with 12.5V) Now I connect the -input of the OpAmp to the supply voltage (12.5V). The voltage in between both resistors suddenly changes from 6.3V to 10.1V. NOT Great! Now I connect the -input of the OpAmp to ground (0V). The voltage in between both resistors changes from 6.3V to 2.4V. ?! The output of the OpAmp is not connected to anything. I thought that OpAmp inputs, in theory, have infinite resistance? The datasheet of this OpAmp (LT1253) sais the input resistance should be 10Mohm I also tested this same thing with the LT1497 and the results are the same. When the -input of the  OpAmp was connected to 12.5V, I measured the current going into that pin, 39mA!! (Only measured on the LT1253) What's the problem here? Are both OpAmps broken? Or is there something about the way OpAmps work, that I clearly don't understand?

Question by DELETED_Electorials    |  last reply


HOW TO: change USB plugs for 5 volts Jacks switch-Inputs (pics)

We have a several pair of carbon fibers pads, but what happens now all of them have a USB plugs that don;t fit with the receptive Jack Plug in 5 Volts Battery This batteries with the pads work to heat blanquet. We need help, or more than this a teacher! who tell us how to take out these USB plugs, how to join their cbables, and the how to add a plug in 5 Volts Jack. If is not clear please let me know Maria

Topic by Maria SoledadD    |  last reply


Analog and Digital Inputs for Teensy 3.2 MIDI Programming within Arduino

Been having some trouble with programming my custom potentiometers for my midi controller. I have 12 buttons and 6 knobs. I have it wired correctly and have the sanwa arcade buttons working fine. I'm just having a huge problem adding analog code to my digital code. I'm not sure where to go from here, I have tried over 20 different types of analog code and I'm not sure what I'm doing wrong. Just need a basic potentiometer for reading MIDI. I have the first 1-12 digital inputs on my teensy soldered in for my arcade buttons. For the analog potentiometers I have them soldered on inputs 18-23 or (A4 thru A9) on the Teensy 3.2. I am using Arduino software along with the Teensy loader. Any help would be greatly appreciated, thank you. Here is the code I have thus far. I only have the 19 and 23 analog inputs written in this one at the very end, because I removed the others.  ******** /* Buttons to USB MIDI Example    You must select MIDI from the "Tools > USB Type" menu    To view the raw MIDI data on Linux: aseqdump -p "Teensy MIDI"    This example code is in the public domain. */ #include // the MIDI channel number to send messages const int channel = 1; // Create Bounce objects for each button.  The Bounce object // automatically deals with contact chatter or "bounce", and // it makes detecting changes very simple. Bounce button1 = Bounce(1, 5);  // 5 = 5 ms debounce time Bounce button2 = Bounce(2, 5);  // which is appropriate for good Bounce button3 = Bounce(3, 5);  // quality mechanical pushbuttons Bounce button4 = Bounce(4, 5); Bounce button5 = Bounce(5, 5);  // if a button is too "sensitive" Bounce button6 = Bounce(6, 5);  // to rapid touch, you can Bounce button7 = Bounce(7, 5);  // increase this time. Bounce button8 = Bounce(8, 5); Bounce button9 = Bounce(9, 5); Bounce button10 = Bounce(10, 5); Bounce button11 = Bounce(11, 5); Bounce button12 = Bounce(12, 5); void setup() {   // Configure the pins for input mode with pullup resistors.   // The pushbuttons connect from each pin to ground.  When   // the button is pressed, the pin reads LOW because the button   // shorts it to ground.  When released, the pin reads HIGH   // because the pullup resistor connects to +5 volts inside   // the chip.  LOW for "on", and HIGH for "off" may seem   // backwards, but using the on-chip pullup resistors is very   // convenient.  The scheme is called "active low", and it's   // very commonly used in electronics... so much that the chip   // has built-in pullup resistors!   pinMode(1, INPUT_PULLUP);   pinMode(2, INPUT_PULLUP);   pinMode(3, INPUT_PULLUP);   pinMode(4, INPUT_PULLUP);   pinMode(5, INPUT_PULLUP);   pinMode(6, INPUT_PULLUP);  // Teensy++ 2.0 LED, may need 1k resistor pullup   pinMode(7, INPUT_PULLUP);   pinMode(8, INPUT_PULLUP);   pinMode(9, INPUT_PULLUP);   pinMode(10, INPUT_PULLUP);   pinMode(11, INPUT_PULLUP);   pinMode(12, INPUT_PULLUP);// Teensy 2.0 LED, may need 1k resistor pullup } void loop() {   // Update all the buttons.  There should not be any long   // delays in loop(), so this runs repetitively at a rate   // faster than the buttons could be pressed and released.   button1.update();   button2.update();   button3.update();   button4.update();   button5.update();   button6.update();   button7.update();   button8.update();   button9.update();   button10.update();   button11.update();   button12.update();   // Check each button for "falling" edge.   // Send a MIDI Note On message when each button presses   // Update the Joystick buttons only upon changes.   // falling = high (not pressed - voltage from pullup resistor)   //           to low (pressed - button connects pin to ground)   if (button1.fallingEdge()) {     usbMIDI.sendNoteOn(61, 99, channel);  // 61 = C#4   }   if (button2.fallingEdge()) {     usbMIDI.sendNoteOn(62, 99, channel);  // 62 = D4   }   if (button3.fallingEdge()) {     usbMIDI.sendNoteOn(63, 99, channel);  // 63 = D#4   }   if (button4.fallingEdge()) {     usbMIDI.sendNoteOn(64, 99, channel);  // 64 = E4   }   if (button5.fallingEdge()) {     usbMIDI.sendNoteOn(65, 99, channel);  // 65 = F4   }   if (button6.fallingEdge()) {     usbMIDI.sendNoteOn(66, 99, channel);  // 66 = F#4   }   if (button7.fallingEdge()) {     usbMIDI.sendNoteOn(67, 99, channel);  // 67 = G4   }   if (button8.fallingEdge()) {     usbMIDI.sendNoteOn(68, 99, channel);  // 68 = G#4   }   if (button9.fallingEdge()) {     usbMIDI.sendNoteOn(69, 99, channel);  // 69 = A5   }   if (button10.fallingEdge()) {     usbMIDI.sendNoteOn(70, 99, channel);  // 70 = A#5   }   if (button11.fallingEdge()) {     usbMIDI.sendNoteOn(71, 99, channel);  // 71 = B5   }   if (button12.fallingEdge()) {     usbMIDI.sendNoteOn(72, 99, channel);  // 72 = C4   // Check each button for "rising" edge   // Send a MIDI Note Off message when each button releases   // For many types of projects, you only care when the button   // is pressed and the release isn't needed.   // rising = low (pressed - button connects pin to ground)   //          to high (not pressed - voltage from pullup resistor)    }   if (button1.risingEdge()) {     usbMIDI.sendNoteOff(61, 0, channel);  // 61 = C#4   }   if (button2.risingEdge()) {     usbMIDI.sendNoteOff(62, 0, channel);  // 62 = D4   }   if (button3.risingEdge()) {     usbMIDI.sendNoteOff(63, 0, channel);  // 63 = D#4   }   if (button4.risingEdge()) {     usbMIDI.sendNoteOff(64, 0, channel);  // 64 = E4   }   if (button5.risingEdge()) {     usbMIDI.sendNoteOff(65, 0, channel);  // 65 = F4   }   if (button6.risingEdge()) {     usbMIDI.sendNoteOff(66, 0, channel);  // 66 = F#4   }   if (button7.risingEdge()) {     usbMIDI.sendNoteOff(67, 0, channel);  // 67 = G4   }   if (button8.risingEdge()) {     usbMIDI.sendNoteOff(68, 0, channel);  // 68 = G#4   }   if (button9.risingEdge()) {     usbMIDI.sendNoteOff(69, 0, channel);  // 69 = A5   }   if (button10.risingEdge()) {     usbMIDI.sendNoteOff(70, 0, channel);  // 70 = A#5   }   if (button11.risingEdge()) {     usbMIDI.sendNoteOff(71, 0, channel);  // 71 = B5   }   if (button12.risingEdge()) {     usbMIDI.sendNoteOff(72, 0, channel);  // 72 = C4   // MIDI Controllers should discard incoming MIDI messages.   // http://forum.pjrc.com/threads/24179-Teensy-3-Ableton-Analog-CC-causes-midi-crash   while (usbMIDI.read()) {     // ignore incoming messages   } } // read the input on analog pin 19:   int sensorValue = analogRead(A5);   // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):   float voltage = sensorValue * (5.0 / 1023.0);   // print out the value you read:   Serial.println(voltage); } // read the input on analog pin 23:   int sensorValue = analogRead(A9);   // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):   float voltage = sensorValue * (5.0 / 1023.0);   // print out the value you read:

Topic by abissmusic    |  last reply


Equalizer for phono input to amp

Circuit for converting an MP3 player output to input for a phono input on an amp.

Topic by knorrisster    |  last reply


Input and output of my transformer.?

I have bought a heavy duty transformer but  input and output wires are not attached to it, so please help me to select the input and output points to solder wire. I have attached an image of it too.

Question by ShuvamP    |  last reply


No sensory input on a motor shield?? Answered

Hello, I recently acquired a seeed motor shield http://www.seeedstudio.com/depot/motor-shield-p-913.html But what i notice now is that there is nowhere to attach my Sr04 ultrasonic sensor! How do I include sensory input on my robot with this shield? Thanks bunches. 

Question by TheIronHobo    |  last reply


What is the input value on an atTiny85

I am programming an atTiny with Arduino as the ISP and am wondering if an analogRead will come out between 0 and 1023 like arduino or a different value such as exact voltage or a different reference.  

Question by stino66    |  last reply


MP3 input alternative on a stereo

Hi guys, I have a really burning question thats been eating me for a while. Can you put an alternative input on a stereo system to read mp3s? For example i have this stereo that plays mp3s but only has the disk input. This means in order to use it i have to burn the songs i want off my computer on to a disk then i can listen to my music. For those who probably WILL ask, I don't like playing my music off my computer because it's generally really loud, i want to use this in another room as well. My taste in music constantly changes, eventually i will want to remove a couple songs or add new ones. With that said, i want to know if you can remove/replace or add another input system to where a CD reader would be so that it reads a USB input or something. Then music can easily be manipulated to the users liking. As long it's not directly connected to a computer or requires the user to make new copies of the same music that take up space. Thanks!! Gonazar

Topic by Gonazar    |  last reply


How to make a input selector?

I'm looking to make a rather large input selector for a propose project a coworker is looking to commission me to make. I know I can buy a board that will be able to handle about four, but I need about 20 or so selections. I'm looking to make your basic AV selection box, where if you press a button, any other pressed button will be released. Any help is greatly appreciated! 

Question by DoctorWoo    |  last reply


Input to text file in vbs

Im getting increasingly intested in vbs and was wondering how to make an input window for example "Your password" and the "password" could be saved in a txt file stored somewhere, i have the start but dont know where to go from there!"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""WScript.Echo "Your computer is being hacked please enter your password to stop hacker"Set WshShell = WScript.CreateObject("WScript.Shell")Password = InputBox("Please type your password.")""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""Thanks

Topic by k_man    |  last reply


Headphone output into mic input?

I've got a cheap voice changer that is hard-wired to a computer-style microphone. I cut off the mic and added a 1/8" miniplug adapter, so as to increase flexibility. I need to connect the powered headphone output of an mp3 player to this voice-changer, what is the easiest way to do so? I tried an attenuator I had lying around, but got no results (are attenuators one way?) is there a good (cheap) solution to this problem?

Topic by gschoppe    |  last reply


VFD DC bus input

So I've heard it is possible to use a high voltage DC input with a 3 phase motor controller, but I haven't really found much info or instructions on how to modify them to be able to take a DC current. I am interested in this because I want to experiment with building an electric vehicle and a industrial motor. I bought a cheap, used VFD and a motor to experiment with, but it would be great to have some info and tips on how to go about doing this!

Topic by ANDY!    |  last reply


Batch/.bat input & output? Answered

I want to make a batch program where I can ask an if statement but there would only be a possibility of two responses. For example if I made the batch file asked "Did you have a good day?", I would only want the user to be able to answer y or n.

Question by Dr. Kreap    |  last reply


Switching voltage inputs with a chip

I have a small project I'm working on that uses rechargeable batteries.  However I want the device to stop drawing from the batteries whenever an external power source is plugged in.  (The external power source would then power the internal battery charger and the main device.)  Is there a chip or circuit that could be used for this?  My only alternative is to modify the power supply port to include a micro spdt that will switch when plugged in.  But I'd rather like to avoid that.

Topic by stalledaction    |  last reply


Cordless Drill Issues Input!

Hey guys whats up, I'm a senior in highschool doing an engineering project involving cordless drills. As the "research" part I made a little survey (5 questions, takes like 10 seconds of your time) and I would HIGHLY appreciate it if you guys would just answer a couple of questions regarding the battery life on cordless drills you use. http://www.surveymonkey.com/s/599YLYQ here's the link Thank you so much!

Topic by hxwhxw    |  last reply


How to be a Student - Input Desired :)

Hallo Everyone Looking to make my first Instructable, and I thought I'd do a collection of useful things on how to be a successful student, aimed at first-years in British Universities. My aim is maybe to publish some of these in our Uni's magazine eventually. So in the name of writing a quality Instructable I thought I'd ask for any hints you guys might have for everything to do with Uni: work, lifestyle, finances, anything you can think of. Thanks for your help guys! Mister Tumbles

Topic by mister_tumbles    |  last reply


PINB register on ATtiny45 not working? Answered

I've been programming a pretty simple led driver in Atmel Studio 6 with the attiny45. The idea is that hitting a push button will advance through three different modes of the LEDs, solid, strobe, and fade. When you reach the last mode hitting the button again should reset to the first mode. For some reason the PINB register doesn't seem to be working. Here is the code: #define F_CPU 1000000 #include #include int main(void) { //  Setup PWM TCCR0A |= (1 << COM0A1) | (1 << WGM00) | (1 << WGM01); TCCR0B |= (1 << CS01); DDRB |= (1 << PB0)|(0< PORTB = 0b00010000;   //enable internal pull up int state = 2;  //initialize some variables while(1) {   //int val = PINB3;       if(PINB == 0)   //if button is pressed, increment state variable   {    _delay_ms(100);   //primitive debouncing...     state = state + 1;   }       if(state > 2){  //if we exceed the number of modes, reset state variable       state = 0;   }else   {    state = state;  //probably not necessary, but has solved problems in the past.   } while(state == 0){   //first mode just turns on LEDs at full brightness     OCR0A = 255; } while(state == 1){  //second mode strobes the LEDs     OCR0A = 255;   _delay_ms(35);   OCR0A = 0;   _delay_ms(35); } while(state == 2){    //Third mode fades LEDs      //  Fade LED on    for(i = 0; i < 255; i++)    {     //  Load new value onto OCR0A register to change duty cycle     OCR0A = i;     _delay_ms(5);    }       //  Fade LED off    for(i = 255; i >= 0; i--)    {     OCR0A = i;     _delay_ms(5);    } } } } All of the independent modes work fine, and even the state variable itself is doing what it is supposed to (I know because initializing it to different values gets me the correct mode) but for some reason the PINB register is not getting any kind of response. I am enabling the internal pull up, and then the button connects the I/0 (in this case PB4) to ground which should make the state zero and satisfy the argument of the if statement, but for some reason this is not doing anything. Any ideas? thanks in advanced!

Question by Higgs Boson    |  last reply


building a complex amp simple cheap

I need to build a complex amp for cheap and as simple as possible i need it to -run speakers at differant ohms safely -have left and right channels -have little distortion -have 3 inputs -have outputs that can run at least 6 speakers off of each channel -have volume control -off/'on switch -portable and have to run of of 9V batteries (as many as it takes) so how can this task be compleated

Topic by fastcar123    |  last reply


linear input to control a rotating servo? Answered

Im trying to build a circuit in which an input uses linear motion to control a rotating servo. the servo rotates clockwise/counterclockwise, and the input should have 3 inputs. turning the servo clockwise, turning the servo counterclockwise, and a neutral option so the servo doesn't have to always move; the neutral would be between the to rotation inputs. The closest form of an input I've found so far is a sliding potentiometer since it is controlled by linear motion. If there's a better input that can have those 3 inputs i'd love to know.

Question by explosive_bagels    |  last reply


Single Audio Input to dual input

Hi, I have an amplifier that only has one input, but I was hoping to have a bluetooth connection, as well as a 3.5mm audio jack. I was wondering if there was a way that I could do this? and that preferably it would switch automatically based on which is being used?

Topic by Fozzibehr    |  last reply


wich is input and wich is out put? Answered

On a hand wound transformer for a joule thif wich is the input and wich is the output primary in? secoundary out?, also does it matter if the thick wire (primary) is on the bottom with the thinner (secoundary) is on the top?

Question by bushman9    |  last reply


Attaching inputs on TVs that have none?

I have a small portable BW TV; it doesn't have any inputs for a VCR or DVD player etc, So as soon as analog broadcasting stops it's a paperweight unless you enjoy watching TV "snow". So this brings up the question is it possible to attach inputs (RCA, Coaxial, etc) to TVs that don't have any inputs?

Topic by G.A.Pster    |  last reply


What is the max input current for the lm317? Answered

I am having trouble understanding the datasheet. Is there a max input current for the lm317? If so, what is it? I want to supply 4A input current to it from a laptop power supply. http://www.fairchildsemi.com/ds/LM/LM317.pdf Thanks.

Question by Dmxspider    |  last reply


rgb led and 1 analog input? Answered

Im trying to make an rgb led light up in different colors to based on the analog input, for instance a "potentiometer" or equivelent like the lm324 controlling the input causes the input to go higher the red turns on then green and then blue progressively, i have some code worked up but am willing to work from scratch again, im working with the lm324 op-amp and an arduino w/328

Question by redd.the.cat    |  last reply


Can i connect input to GND ? Answered

Hello, i have a little amp based on this layout : My question is : when i need to temporary disable the input, can i connect "IN" to GND ? Thanks for advance!

Question by login721    |  last reply


What are the "Enable Input" pins on a decoder? Answered

I'm trying to multiplex with an arduino and a 74HC238N decoder. on the datasheet I was looking at I saw that besides the 8 outputs, 3 inputs, GND and Vcc there were also 3 "Inable Input" pins, that I couldn't figure out what they do. Can somebody please explain? Thanks. 

Question by yonch    |  last reply


Solar charger with power plug input? Answered

I love all the solar pieces on instructables, but I was wondering if you can make a solar charged device with a power plug input in it so anything can be plugged in such as a phone charger without having to dedicate the solar charger to one item by ripping up an existing phone charger. Thanks

Question by toil_and_spin    |  last reply


DIY composite/component input switcher Answered

I am trying to build a box that lets me switch between 4 composite inputs and 1 component input. my TV has a component input where the Y jack also accepts composite video. i originally figured i could just get a six position switch and just switch the ground line but then i thought that would end up sending a video signal back into the other consoles which seems bad. i thought about using transistors and a picaxe or something but an option that only requires a switch would be much more pleasant. what would be the best option and where can i buy a switch with that many poles and throws or where can i buy transistors that will handle frequency of the video and audio signal?

Question by Deshmal    |  last reply


value of a potentiometer to attenuate amp inputs?

I have three 'sources' of stereo audio fed into my NAD amplifier. Each source has a different (non-adjustable) output level. So when I switch each one at the Amp input selector the output volume changes significantly. I just want to attenuate the two highest outputs with a trimpot at source before inputting to the amp, so that each are roughly at the same level. Any idea what value trimpots I can use?

Question by barrykap    |  last reply


Traffic signal input voltage help

I have recently bought this traffic arrow from a surplus store and i cannot find the input voltage anywhere on the net. it has a built in switch mode power supply from what i can tell and i think it is 120V AC but am not sure. the arrow is a GE Gelcore LED Traffic Signal. ANY help would be appreciated.  thanks

Topic by devicemodder  


LF Help on Audio Input and Output

Looking to build an 'audio switch' for my devices on my network or have a circuit board to have on my desk. I have 5 computers (windows/mac/linux) I run at any given time, some used for Skype, Youtube, Music, and/or Gaming. I am looking to make something that I can connect up with 3.5mm sound and mic jacks to a main board and controlling the input and output to different speakers and headsets all on 3.5mm.  Ideally I'd like to have volume control on the board itself, but isn't required. Does anyone know of a instrucable already made?

Topic by AlexR32    |  last reply


Analog and Digital inputs over serial?

Good day, question i am building a controller for my robot and i need to send the inputs(analog/digital) by xbee to my robot. now i am not good with programming i get stuck with the first line.... i want to know how i can program it to send it values over serial from xbee tot xbee on robot i didn't get anything work so far, maybe you guys cant help me with a start? Inputs -> arduino -> serial -> Xbee -> Xbee(receiver) -> arduino -> outputs(servo, lights, motors, steppenmotors) the inputs on the controller are 8 switches(digital) and 6 analoge joysticks! Prototype robot is pictured on the picture it had for now a arduino relay shield to control the motors but it will be change to a motor controller(I don't have one yet) any type is possible!

Question by mvan h1    |  last reply


Xbee direct input - without arduino

Hello! I recently purchased two XBee Series 2 modules for a personal project. I did everything I wanted with the arduino connected directly to the sensor but I want to try remote signal processing. I want to connect an analog sensor (or digital) to one of the XBee's pins and with the other Xbee connected to an Arduino , where I want to process data from the sensor. All the examples found on the net are made with XBee Series 1 but I hope someone still managed and XBee Series 2. I would be interested configuration made ​​with x-ctu or terminal. Thank you!

Topic by didrau    |  last reply


MP3 player with USB disk input

Hi All.I use my USB flash drive to play music on my PC and in my car. My stereo at my entertainment area does not have a USB input so I have to plug a device into it via aux such as a phone or MP3 player. My question is; are there any MP3 players that have a port for a USB flash drive? I have an old phone that I currently load with music to play on my stereo when I have guests but I would prefer to simply plug my USB disk into a device to play music off of it. Its a pain to load music onto my USB, then have to load the music again onto my old phone. Thanks

Topic by Waynne-EdwardR