how to install aux input in my ford laser car?

I have a ford laser. i want to instal aux input into it so as to listen to mp3 and i-pod. can you please advice the instructions and the wiring diagram.

Asked by 8 years ago


adding a video input jack to a malfunctioning portable DVD player

I have a Coby portable DVD player that is malfunctioning in that it won't play discs, but the video display appears to be working normally. The jacks on the player are output only and I'd like to be able to switch one of them to an input jack so I could have an additional screen running off of a newer portable DVD player. Are there any known instructions out there? Is it feasible? Thanks, Jim

Posted by jimmilt 9 years ago


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!

Asked by Bot1398 5 years ago



How do you connect multiple Inputs to an Arduino?

I need to connect 4 toggle switches and 1 pressure switch to an Arduino duemilanove. How do I do this and what is it recognized as in the arduino programming? pictures would help!

Posted by Buzzsushi 8 years ago


How to make Arduino ingore the first button input?

Hey guys! Another question involving buttons. I have a button and the first time that it is press I need it to be ignored. On the second button press I want it to turn an LED on. Thanks!

Posted by HavocRC 4 years ago


is posible to input video in to a 2.5-inch lcd?

hello, my question is this: I have a 2.5 inch LCD screen, a console "microboy" Specifications: Console - display my question is: I can input video in any way? ( video out jack is broke) thanks I have also a "ipaq" poket pc without battery and peripherals expansion, only sync dock and charger. thanks again and greetings from Argentina

Asked by zatanclauss 7 years ago


How do I use arduino's analog input? Answered

I'm building a 'time fountain' and i'm planning to make the arduino know how many droplets of water are falling each second. My ideia was to get two wires, get them really close and when there was a drop of water the circuit would close. The problem is, how do i get arduino to get readings right out of this?                        o (droplet) (positive) ---- ---- (analog input)

Asked by Sowee 4 years ago


How can I send audio through a mini coaxial jack?

I have an outdated (but retro & cool-looking) Sony Watchman FD-500. It has a powerful radio & speaker as well as a 5" black and white tube television. Although digital broadcasts have pretty much ruined any chances of getting TV signals on the screen anymore, there is a 1/8" headphone jack-sized input on the rear for "EXT ANT". i found a coax-to-jack converter that allows me to plug in video inputs like a Nintendo once i tune it to Channel 3. I was wondering if this same jack can also be used to feed in audio from an iPod or phone. Since it looks like a normal headphone jack I tried the obvious, a direct input, but something isn't going through. Here's a link to a page with photos: http://www.radiomuseum.org/r/sony_mega_watchman_fd_500fd50.html

Asked by noapparentfunction 4 years ago


Square Capacitive Touch RGB LED Buttons

I'm having a hard time finding parts like these - is anyone aware of an RGB LED capacitive touch button?  Preferably with the light and the touch sensor separate (DPDT-type, perhaps?).  I'm looking to make a physical prototype of a mobile puzzle game I'm working on, and this would be an ideal input method. Thanks! -Jesse

Posted by xepherys 3 years ago



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

Asked by mohamed amin 2 years ago


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?

Asked by bushman9 3 years ago


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?

Asked by Deshmal 4 years ago


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:

Posted by Necrofenser 4 years ago


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

Posted by Gonazar 9 years ago


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?

Posted by AlexR32 2 years ago


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?

Posted by gschoppe 10 years ago



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

Posted by fxsapa 9 years ago


Want to find capacitive touch input for project

Hi there, I am working on a personal project and would like to find a capacitive touch input device which is roughly 5x30cm in size and will give me a x,y value for one or two fingers. The resolution does not need to be brilliant - 7 bit range in the x direction and maybe 5 bit in the y direction would be fine. Serial interface which I can use with my Arduino. I would also like to get a "pressure" for each - I know this is asking a lot but the "pressure" can roughly be guessed at not by actual pressure but by perhaps an increased/decreased capacitance or the amount of the surface being covered. I only need this to determine which of the two finger inputs is pressing hardest so again it doesn't need to be precise. Would anybody know of such a device? I mean - there must be companies producing these, I'd not want to go and have a custom one made for price considerations but surely there is something vaguely close. I have looked into the possibility of making one for myself but it appears I would struggle to do something this complex with my Arduino alone and the only IC which will do this with a homemade panel (not that I have the ability to create a capacitive panel with this many pads) seems to be QProx QT1081 which only accepts 8 inputs. Any pointers or ideas would be very gratefully received :) Cheers, Adam

Posted by Adam_D 7 years ago


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!

Posted by didrau 4 years ago


How to connect physical pushbuttons to a computer for use in a soundboard program?

I plan to do a project that will use 28 arcade style pushbuttons to activate 28 different sounds on a computer. Any ideas on products out there I can use to connect all 28 buttons to a computer, preferably with a USB cable, so it can be used in a programming language such as C++? One idea I had was to take apart a QWERTY keyboard, but I still want to be able to use my regular keyboard to use my computer. Alternatively, is there a way for two keyboards to be connected to same computer, but one of them only activates a specific program? i.e. trying to type in notepad with it wouldn't work?

Posted by Swordmasterb 4 years ago


picaxe sensitivitį

Hi there instructables, recently I have bought a picaxe starter kit, soldered it and stuff, played with some code and leds, but now I want to make a time control, so I bought a cheepo alarm clock, desolder the piezo beeper and extended the wires so I can conect them to my picaxe, turns out its too sensitive, the pin I've set to input piks up heat fom my fingers about a centimeter away, breath too, I think it picks up grounding as a signal too, does it ment to be that sensitive or have I messed something up with soldering or the code?  heres the code I used  main: if pinc.4 = 1 then goto led goto main led: high c.1 pause 500 low c.1 pause 100 goto main

Posted by batonas 3 years ago


How to make USB Female socket for Nippon NS68LO music system?

How to make USB Female socket for Nippon NS68LO music system which is OEM with Suzuki Cars and do not have a USB port although the system has a facility to connect USB drive through a round 8/9 pin socket at its rear.. I have seen some good uses of USB here and hence thought of asking if you could help me out.. Warm Regards, Rahul, India.

Asked by rkorde 6 years ago


Editing an Instructable will not display

1. What Operating system the device you are using, if its a computer, that would be linux, windows or mac (or freebsd etc) for mobile it would be android, iOS, windows mobile. Please also include the version number. Ubuntu Mate 17.04 and Windows 7, all operating systems 2. Browser information including version number, if you're using the mobile app include app version number Linux Chrome Version 58.0.3029.81 (64-bit) 3. Include what project or url you were looking at when the error occurred https://www.instructables.com/id/Raspberry-Pi-Garage-Door-Opener-with-streaming-vid/ 4. Screen shots of what happened if available  After saving only middle 4 lines are saved.                 AuthType Basic                 AuthName "Restricted Content"                 AuthUserFile /etc/apache2/.htpasswd                 Require valid-user         5. steps to reproduce, this will be one of the most important pieces of information as it will enable us to do the same thing and find a fix. See number 4

Posted by pber 1 year ago


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? 

Posted by dbirky 4 years ago


cintiq

Is it possible to convert a tablet pc screen into a cintiq?

Posted by evillordnikon 9 years ago


Can I wire these speakers in sequence? Can I use input for output?

I'm filling a box with multiple different speakers I have salvaged from different items. I would like to wire these speakers in some kind of sequence. Basically, I would wire one to the source, and then I would wire the next speaker to the speaker that's already been wired, using the solder to connect. Would this work correctly? Also, I have a volume switch that uses A/V connections. The problem is that it has three inputs but only one output. I would basically like to reverse this. Is it possible?

Asked by metalshiflet 4 years ago


how do i add RCA inputs to my portable dvd player?

Hi After moving i unearthed my old, but very big screened, portable dvd player. It used a Li-Po battery which is lost and has been flat for 4-6 years, so its unlikely to work anymore, and even so, i no longer need it. What i do now need is an LCD reverse parking monitor. I have everything but an LCD with RCA inputs, so i figure, why not repurpose my DVD player. I need to know,  how would i go about locating the correct area in the circuit to connect the RCA input? I know how to follow tracks, im just not sure what it is im looking for, My first thought was, follow the RCA outputs, and hope that at some point it leads to where the DVD player is producing the RCA that goes both to the output jack, and also to another processor/ encoder/ decoder which then feeds the data stream to the LCD, and all i need to do is sever the original RCA track and use my own, however before i do anything, i want a second opinion, as well as also finding out if my logic is sound. If infact the datastream from the dvd reader is being turned into a decoded datastream for the LCD in the same place that also creates the RCA output, then this wont work, as there is nowhere to put the inputs. In this case, how would i go about getting my video output to display on the LCD? how would i go about locating a decoder and conecting it up and ect,  just video anyway, for the time being i dont need audio, also the audio track is easy enough to manually hijack anyway. This is a situation where i would rather spend an excessive amount of effort in getting it to work rather than buying a display. Thanks

Asked by oldmanbeefjerky 5 years ago


Help on VU meter?

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)

Asked by sunny342 8 years ago


Project in mind. Need ideas for simplicity.

I have a project in mind. I have children with a pet cat. I intend to build a charcoal filtering for a catbox/cat tree I am building. I want to use an alarm clock (easy to adjust time if needed) to activate maybe a buzzer and flashing light daily for box cleaning. The fan runs at a low speed constantly at the top of a vent tube to keep the smell controlled.  I want an input to reset the buzzer/flashing light when the drawer with the litter box is opened. I have no idea how to build the circuit. I tested the filter system on a mockup box. It works fine cat doesn't notice the fan. (its 3ft up a 3" piece of PVC). The lack of smell is the reason I'll need a reminder. I could purchase an industrial programmable relay but cost is a huge factor and buying an added power supply etc for control voltage adds up. I have an industrial electrical background and no problem working with small circuitry but have never designed anything so hints and help will be appreciated.

Posted by alienmemebr 6 years ago


Is there an easy way to port an instructable to a website that I'm making?

I'm making an informational website for my Web design class using Adobe Dreamweaver. He wants it to be informational, so I figured it would be easy just to move my instructable to the site and format it a bit rather than start from scratch. I tried copying the source code, no go since the pictures aren't stored "locally" Right now I'm in the process of copying and pasting the text, but there has to be an easier way (this is a 30 step instructable) Do you know how to port an instructable to another site, while keeping all of the images and text local to a flash drive? I'd like to preserve the notes option as well. I can't use the flash insert that the site has made, because it's too small and doesn't work right for my use. Any ideas?

Posted by lukethebook333 8 years ago


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?

Asked by DELETED_Electorials 4 years ago


I want to change my speakers which have an ac input into a dc input so I can have them portable Any help ????

Basically I really need help here. I just bought a set of old small speakers and I wanted to turn the Ac input into a Dc input and I have no idea how to any ideas ?? The step down transformer is inside one of the speakers and I'm not sure how to make it into Dc Money's not really an option but I don't really want to buy more speakers most appreciated Ed :D

Asked by 3dwardify 3 years ago


How can I make my own USB hardware (Basically Input Output)?

I am looking for a Way to Have my computer (using C++ if possible) interact with a device made by myself through the USB port. Basically Input/Output.

Asked by GMer56 9 years ago


What is the standard size dc input jack socket for music equipment i.e. mini amps and guitar effects gadgets? Answered

As quite a few people will have noticed (because i have asked so many 'beginners' questions on here) I am building a mini guitar amp. I am wanting to use a 2.5mm or a 2.1mm dc input socket, I was just wondering if there was a 'standard' size connector. I'm sure I have heard there is one size commonly used in guitar effects pedals and equipment like that. It doesn't really matter, because this is likely to be a one- off product, but if something breaks a few years down the line then I would like to be able to say i'd used the most common jack, so i can get a replacement.

Asked by mdog93 7 years ago


How to make a Three Axis computer inpite device for 3D modeling?

Does anybody know how to, or have they made an input device for 3D modeling that tracks horizontal movement, vertical, and depth?I'm looking to build something similar to this device. Link: www.youtube.com/watch

Posted by jacob5680 8 years ago


AtTiny85 port analog / digital setup order bug

/*How to configure port setup in correct order AtTiny? Bug in combiler or  what is wrong here? Circuitry here has two LEDs and one analog input.  LEDs are ON or OFF depending voltage of potentiometer. Simple code below makes digital output PB1 high impedance, so LED current is too low because voltage drops. If port configuration setup is made in other order port output works fine. */ /*                     ___     D5 PB5  1|o      |8  Vcc     D3 PB3  2|        |7  PB2 A1   Voltage measurement, potentiometer     D4 PB4  3|        |6  PB1 D1   --|>--|          GND  4| ___|5  PB0 D0   --|>--| */ byte led0 = PB0; byte led1 = PB1; byte potentiometer = A1; int voltage; /* It is important in which order pin configuration has been set. Wrong order causes PB1 to high impedance, low current, output. This must be combiler bug, I think. If port BP1 setup has been made using straight to register there is no problem in order. Any other analog input port and digital port combination works correctly. */ void setup() {   pinMode(led0, OUTPUT);   pinMode(led1, OUTPUT);  // Doesn't work if this is before pinMode(potentiometer, INPUT);   //DDRB &= ~(1   pinMode(potentiometer, INPUT);    //pinMode(led1, OUTPUT);  // Works if this led1 setup is after pinMode(potentiometer, INPUT); } void analog_input() {   voltage = analogRead(potentiometer);   if (voltage     digitalWrite(led0, HIGH);     digitalWrite(led1, LOW);   }   else   {     digitalWrite(led0, LOW);     digitalWrite(led1, HIGH);   } } void loop() {   analog_input(); }

Posted by PaavoM 1 year ago


how to build dc electromagnet which produce 5mT of flux density?

Which type of core should be used.it is used in electronic circuit just to wake up data logger

Asked by dhanushar 1 year ago


Looking for software to run a touch screen device utilizing Acoustic Pulse Recognition.

I was recently reading about Acoustic pulse recognition as a means of turning a pane of glass into a touch screen. I feel this would be a very unique project to attempt, and would make a great, or at least interesting, input device to setup somewhere in my home. A pane of glass with four microphones used to determine the location of a touch is essentially what I'm talking about. The first logical place for me to start would be to begin searching for software that would make such a device functional, but my search has yielded no results thus far. Does anybody know if there is software ( preferably multiplatform ) available for Acoustic pulse recognition, or might I have to use some form of dedicated hardware to run the device instead? I somehow doubt I will find exactly what I'm looking for due to the complexity of what it needs to do, but It doesn't hurt to ask. 

Asked by jacob5680 6 years ago


Audio switch with four inputs and push button toggle?

I'm looking to create a device similar to this instructable: https://www.instructables.com/id/Audio-switch-2-inputs-1-output/ However I need four inputs and I would be using a push button as the means to jump between inputs. If I could also have some sort of indicator LED that would be helpful. Not quite sure how to tackle this project.

Asked by Nameless37 3 years ago


whats the best add an aux input to a 1998 ford taurus?

It has the tape deck also, i really dont wanna spend much money as i have a a fair amount of experience with electronics and i have oodles of components laying around

Asked by quellek2 7 years ago


If i put too much input signal into my little amp will it burn?

 I'm building a 5 speaker boom box out of a heineken beer keg. For the input interface and amplifying, i'm using an old pc speaker amplifier circuit, and i want to do the following changes to it: Put 3 input jacks, altogether (plugged into the same spot of the circuit): 1x   3.5 mm jack for mp3 player input. Kind of Aux input.                                                      2X  1/4" jack for two guitars or another combination of instruments. Put another output jack, 1/4", additional to the 3.5mm already there. Questions: If i plug too much things in will the amplifier burn or explode?                      Will it be able to drive 5 speakers (1x 1.5", 2x 2" and 2x 4" approx.) Other info: it runs with a little transformer of 220v/60hz to 9V DC. The speakers were rated to 110V/60hz. Does this means it acctualy runs on 4.5V DC?  

Asked by vinacarv 8 years ago


Portable DVR for helmet-cam.

Is it possible to add an A/V input to an old VHS-C camcorder?? I have a helmet-cam but don't have something that I can record to. My digital camcorder doesn't have a/v or d/v input. I could just buy a new camera or dvr but hey, its much more fun trying to hack something old... obviously.

Posted by sof.tpy.ram.ids 10 years ago


How to make a simple USB Hardware ?

How can i create a basically usb hardware ( input/output like a Button and a LED ) and connect that to my PC. so when i press the Button (on the board) , a code runs ( run a program or .... ) . and when a code runs on the pc , the LED light on. I think it'll a simple project, but i asked it and people replied me that i have to make a driver for this device, but i dont know what i have to do :(

Asked by amirreza619 5 years ago


How to connect higher voltage to PIC chip input reliably ?

The PICAXE 08M2+ IC is just an 8-pin flash PIC with nanowatt... I have been working on my 3000mW handheld laser monitoring system for ages. It is a picaxe 08M2 connected to an LED, a buzzer through a transistor, a thermistor, and an 8.4V input. It is almost perfect, the problem I have isn't really serious, but I want to make it perfect. Now read carefully what happens: The picaxe comes on when the laser's "armed" keyswitch is turned. An on/off pushbutton then controls turning the laser on/off, all the while the picaxe is still on. The PICAXE runs off a 78L05 connected to 8.4V. If I turn on the PICAXE, it works all fine as usual. When I turn on the laser (1.5A load), it is still perfectly fine due to the 0.22uF capacitor I put on the PICAXE 5V rail! BUT, if the laser pushbutton had been left on, and you turn the armed switch on, the laser comes on as usual, but the PICAXE doesn't boot. If I turn the laser pushbutton off then on, even for a millisecond, the PICAXE boots and works fine from then on. Now here is how it is wired up, I want the PICAXE to know when the laser is on, so I connected the pushbutton to INPUT3 on the PICAXE so INPUT3 gets power along with the laser when the pushbutton is pressed. I realise that the 8.4V input is too high for the PICAXE, so I experimented with resistors and discovered that a 47K resistor between the 8.4V and the INPUT3 worked fine (with a 10K pulldown). I have checked and it is not a software problem. What I don't get is why the PICAXE stays working fine when the laser load is turned on, but not if they are both turned on at the same time. The attached drawing is to help explain my set up. See how the PICAXE only fails to boot if the laser on/off switch was already on when the main keyswitch is turned on. If I turn the laser pushbutton off then on, even for a millisecond, the PICAXE boots and works fine from then on. I hope it wasn't too hard to understand...

Asked by jdorne 5 years ago


How can i use a small camera lcd screen for something? And how do i make an imput for it?

Its a 2.5 inch lcd screen but i dont know how to make it posable ot plug something into it. Ex. a GoPro camera. any sugestions?

Asked by csmity9 7 years ago


Input problem with OpAmp-controlled ZVS Induction Heater

Hello, Idea: I'm trying to build a circuit which uses an OpAmp to drive 2 mosfets, which power the LC tank of an induction heater. The idea is to detect when the voltage over the LC tank crosses zero, and at that voltage I would make the 2 outputs of the OpAmp change states from fully on, to fully off. The two OpAmps (both inside one chip) have their positive and negative inputs connected to eachother, but with reversed polarity. This would make sure that one output is high, and the other one is low. Why use an OpAmp? I wanted the MOSFET gate switching to go faster as usually, because in the mazzilli circuit, the gate voltage actually slews at the same rate as the LC tank's voltage slews when it crosses zero volts. In the mazzilli circuit, it actually doesn't switch when the voltage is 0v, but when the tank voltage drops below the gate threshold voltage. This would mean that you are always switching current at 5v (for example) instead of at 0V. So for these two reasons, I wanted to try switching them with an OpAmp. Measurements: Probe I on drain 1, probe II on drain 2, and GND on the circuit's ground, gives me an expected result: when switching states, at 0 voltage of the LC tank, the voltage on one side stays low (since it's pulled to ground) and the voltage on the other side goes from 0v up to 50v, back down to 0v, like a sine-wave. Then the OpAmps switch again, and the one side now goes up to 50v as a sine wave, and the other one stays low at 0v. All good, this is working just fine. Probe I on the one differential input line, probe II on the other differential input line. Since this is nothing more than just a 1/10 voltage division of the previous measurement, I'm also expecting the signal to be exactly the same, but 11x smaller. -> problem: However, this does not happen. Because of some strange reason, as you can see in the scope images: Both channels go high, Twice per cycle, instead of going high only once per cycle, and staying low for the next half of the cycle. This really isn't good! Do the inputs affect the waveform in some way? Remarks about scope images: Image: 2 gates Blue gate voltage seems 'quite' fine. Turning on looks good, turning off is not really good becuse if tends to turn on for a short time once again, before it fully turns off. Yellow gate voltage is terrible. Turning on doesn't happen as expected. Voltage drops back to 0 for a long while which is very bad for the circuit. Frequency seems fine; 50kHz is as expected with the 14µH and 6µF. Image: 2 drain voltages These voltages were measured with a 1-10 voltage divider, and thus show only 1/11th of the actual voltage. This is getting close to what I want the LC tank to do. The voltages seem quite like sine waves. I suspect that if the gate voltages would be as they should be, these drain voltages would also be perfect sine waves. The regular sine amplitude of 50V is as expected, with a 24V supply voltage, but at the moments when the drain voltages strangely drop down to 0v, as you can see in image: '2 gates', at these moments the drain voltage seems to spike over 250V!! Image: 2 differential input lines This is the image which I don't understand. I expect the same wave as in the previous picture, but only 11 times smaller because of the voltage divider. However, the voltage does NOT reach 0v while the drain voltage does, and its shape is also completely different. In this image, both channels are doing one (half) sine wave, twice per switching period. They should be LOW for half a period, as the drain voltages do in the previous image. Better quality images: 2 gates 2 drain voltages 2 differential input lines schematic Datasheets: OpAmp: http://cds.linear.com/docs/en/datasheet/1497f.pdf MOSFETS: http://www.vishay.com/docs/91262/91262.pdf Coils and capacitors: Line inductor value: I'm not sure if this value is correct. Center-tapped main coil inductance: This value should be pretty correct, I calculated it by measuring it's size and windings, and the operating frequency is also nearly the same as the calculated one. tank capacitance: 6 times a 1µf MKP capacitor Questions: - Why these strange large spikes? - Why is the waveform suddenly different when reading it near the differential inputs? For the first time ever, I can provide you with scope images! I finally bought a (quite cheap) oscilloscope. I hope it helps a lot. Oh, and one more thing: The induction heater does actually work already. I'm getting huge currents in the LC tank, since the 6mm copper tubing gets hot after a minute. Water cooling has been added, and it works like a charm! The MOSFETS do get quite hot after 15 seconds of heating an object, or after 40 seconds of heating nothing. This, probably because the gate voltage isn't what it should be. Kind regards, Electorials

Asked by DELETED_Electorials 4 years ago


can i hook up a PC to an LCD TV with another input?

I have a 32 inch sylvania 720p TV in my room and it has no PC input. would it be possible i could plug my computer into a different input and have it still work fine?

Asked by redsuit09 8 years ago