Soldering a TRS to TRS cable?

I am trying to make a transfer cable for my TI-84 Plus Silver Edition Calculator. It came with a USB-mini to USB-mini cable, but it has two ports on top. One for a USB-mini cable, and one for an I/O cable, with 3/32 TRS jacks (2.5mm) from Radio Shack. I am wondering how to connect two TRS jacks together to make a transfer cable. I don't know what kind of wire to use, or how the wires should be connected.

Question by Pettrocity   |  last reply


tech noob question on stereo jack

Can I have a silly technical question for which I would have known the answer if I only paid more attention at school? how is possible that stereo headphones, ie 2 speaker circuits use only 3 cables? I understand the "ground" is the one that both speakers,ie left and right have in common but how come it doesnt bother the signals which go to the speakers? doesnt the left signal get mixed up with the right signal? and why is it called "ground" when it's not actually connected to the ground, like for example lightning conductor is? I've read through the wikipedia article about TRS several times but still can't understand it. thanks for answer, I promis I won't forget it this time :)

Topic by tap   |  last reply


Microphone wiring? Answered

I have a broken microphone. Its wire is cut  inside the insulation. i want to replace the entire cable. when i removed the plastic cover of the microphone i saw a red and a black wire soldered to it.  Therefore it uses only 2 wires but in the connector it is a TRS one not a TS one. i will also replace the connector.  i am wondering how should i wire a TRS connector which has 3 leads. one being the common ground. but the other 2.  should i short them out and connect the red wire or must I connect the wire to only one lead?  Then if i buy a $0.2 TS connector and i wire it accordingly. will it work? One another question does the microphone device has polarity that is should i connect  positive to positive and negative to negative lead. because there is no indication on the Mic?

Question by ARJOON   |  last reply


Converting stereo sound to mono from an mp3 player or other similar devices? Answered

I am makin a small project where i need to input mono sound. almost all mp3 players output stereo channels.  in my circuit i have a TS connector where mono sound need to be input.  if i connect a TS connector in a TRS socket., will the output be automatically be mono or i will only get one channel out of the stereo output from the mp3 device???? thxs in advance

Question by ARJOON   |  last reply



EVGA 01G-P3-N959-TR GeForce 9500 GT Video Card compared to a XFX Radeon HD 4550? Answered

Ok, as the title sugests (i cant spell that word!), which is better? The GeForce 9500 GT or the Radeon HD 4550? I have the 4550 and im wondering if the 9500 will out-perform the 4550. I play a little cod 2 and gta san andreas multiplayer. PLEASE REPLY!

Question by sci4me   |  last reply


how do i put window back on track on 1999 dodge truck , electric window?

Should there be a roller on it and where can i get them?

Question by don cochran   |  last reply


I have wireless headphones that has to have the transmitter plugged in to the TV,?

 but my tv doesn't have the audio plug the transmitter will plug into.  Is there any way I can make it work ?

Question by deancross   |  last reply


How to communication between arduino and computer? Answered

I am working on Fleet management and this with my project There are three possible states for the device which we need to implement (Off, Running, Configuration, Factory Settings) There should be a button to change the device status (only one button please). If the device is already off, pressing this button should bring the device in running mode. If the device is on, pressing this button for 5 seconds should bring the device in configuration mode If the device is in configuration mode, pressing the button for 5 seconds should restart the device, and pressing the button 3 times should set the variables to default values. If the device is on, pressing the button for 10 seconds turn of the device When the device is in configuration mode, we should be able to plug the device with a computer using USB. The device should start sending it's internal APN code with a specific sequence e.g. TRRT as soon as it sends this code to the computer, it should wait for response from the computer. The computer can sends back the code TRRT or no response. When the device receives TRRT, it should match the IMMI it sent and the IMMI it received. If both matched, then it should wait for settings: The computer will send data as TRRT where varname is e.g. APN, USERNAME, PASSWORD, URL, POLL_INTERVAL etc. the value after first : is the the value of the variable. The device should save these values to SD or it's internal memory immediately. Now press the button for 5 seconds, the device should restart and straight away enter into running mode. Now the device should connect to server using and sends GPS location and speed every interval set by the POLL_INTERVAL variable. Let's achieve this first, I'll add more functionality once we're done with this. Thanks,

Question by SulemanC   |  last reply


How would you make a direct link from a phone to an iPod through the TRS jacks to record ringtones? Answered

Hello! This is my first post on this site so I hope it will be a good one! I have both a Samsung Messager and an iPod Touch 4th Gen (I'm not too sure if versions matter in this or not). The phone has a 3.5 mm TRS headphone jack with both three and four conductor capabilities and my iPod has the same. Now, this is the conundrum I am in: My phone has the capabilities to record sound one of two ways, through the built in mic or through the headset (which also has a mic). However, when I do the recording sounds garbled, static-like, and all around horrible. Would there be a way to make a direct link from my iPod to my phone through the TRS jacks? I was thinking that if I did this then the digital sound quality would be much better. Then I could play my iPod, turn on the recording feature on my phone, and easily record the songs as they play. Then I could use those recordings as ringtones. If at all possible I would not like to take apart my phone or iPod but I don't care about the headsets, I have plenty. I have experience in soldering and a bit in cicuitry. Thanks in advance!

Question by ben_xman   |  last reply


I need away to use my blue tooth ear piece as a transmitter to another blue tooth ear piece.

I need to be able to listen from a short distance away. sort of a spy device.  having its own coded freq. would be helpful too.

Question by Demascus   |  last reply


On-line electronics store help?

I need an online electronics supplier which ships to Turkey.Shipping has to meet the limits given below,speed of shipping won't matter too much.Price limits are this low because I will quickly get broke otherwise. Shipping limits 3.33USD 2.50EUR 2GBP

Question by Derin 


Why am I getting following error message when I try to edit my published collection?

I'm getting following error message when I try to edit my published collection. I don't get such error while trying to edit draft collection. Something unexpected happened! If the error keeps occurring, file a bug report!

Question by RohanP1   |  last reply


Using a desktop power supply to power a flyback transformer for a Jacob's ladder Answered

The title says it all. Is doing such a thing possible? The power supply would act as a 'barrier' of sorts between the wall power and the power of the circuit. The flyback transformer from an old tv would increase the voltage after it has been decreased by the computer power supply for the actual Jacob's Ladder. 

Question by TheNickmaster21   |  last reply


How I can generate 400-450 volts from a flyback transformer?

I want to charge a capacitor bank of 400-450 volts (I am not decided, yet) and I want to use a flyback transformer, I want to use a input voltage from 9-12vdc. A recomendation of a flyback transformer that I can use or some schematics would be great. Thanks AMD

Question by Kurt Gerhard   |  last reply


What are these electronic parts for? Answered

I was taking apart this toy car called a formula fueler from hot wheels and found these to parts that look like leds but on a board. They each have a led thing and two wires on has red and black wires while the other has  purple and black wires. The red and black one has thes letters on it "LED REV:03 B4048-0030050" and the one with purple and black has "PHO-TR REV:00 C4331-003-5000". What are these and what are they used for? Should i keep them for future projects?  

Question by redlizard5   |  last reply


Could someone tell me exactly what resistors/DC transformer/gauge copper wire I need? Maybe even provide some links?

So I'm trying to make this:https://www.instructables.com/id/cool-DIY-infinite-LED-tunnel/ and I bought 20 of these Blue 10mm superbright LEDs 1025LB7C Could someone tell me exactly what resistors/DC transformer/gauge copper wire I need? Maybe even provide some links?Maybe even provide some links?

Question by shyguy567   |  last reply


How can I generate a formatted HTML file with PHP?

I'm doing a major reconstruction of my website. I want it to be more dynamic and interactive (CMS), something like Instructables. I already started the login-logout cookie system, establish a MySQL database and found a user friendly text editor. I'm planning to buy a ".com" domain if I get the system to work. I'm not trying to compete with ibles or anything, but rather just want to make a site where I can post guides then display it on my homepage. Similar to the GUI of ibles.  My Site: ASCAS.tk Can you guys help me find a decent PHP code that would generate formatted html files, so that I would be able to post step-by-step guides similar to instructables... Don't worry about the database, and the text editor, I'll just figure it out.  As a sign of gratitude, I would like to gave away a patch or a 3 month Pro-membership to the person who gets the best answer :D  _____________________________________ //I found a code, but sadly I can't get it to work :(  error_reporting(E_ALL); require_once 'KvzHTML.php'; // These are the default options, so might // as well have initialized KvzHTML with an // empty first argument $H = new KvzHTML(array(   'xhtml' => true,   'track_toc' => false,   'link_toc' => true,   'indentation' => 4,   'newlines' => true,   'echo' => false,   'buffer' => false,   'xml' => false,   'tidy' => false, )); echo $H->html(   $H->head(       $H->title('My page')   ) .   $H->body(       $H->h1('Important website') .       $H->p('Welcome to our website.') .       $H->h2('Users') .       $H->p('Here\'s a list of current users:') .       $H->table(           $H->tr($H->th('id') . $H->th('name') . $H->th('age')) .           $H->tr($H->td('#1') . $H->td('Kevin van Zonneveld') . $H->td('26')) .           $H->tr($H->td('#2') . $H->td('Foo Bar') . $H->td('28'))       )   ) ); ?>

Question by ASCAS 


How to replace batteries by an adapter for a photographical flash ?

Batteries in flashes are good for a one time flash but they are exhausted very quickly and it takes a long load time between two flashes. For stacking photography this is "nefast" Is there a possibility to make working flashes with an extern current provider or adapter? I work with several different flashes (Olympus TR 32 (2X), Olympus FL36R(1X), Metz 45 CT-1(1X) and Cactus AF 50 (3X). As you can see working with batteries is expensive and not ideal. Is there somebody with ideas about? Thanks

Question by JOVANHA   |  last reply


Building blocks associated with Arduino 433 Mhz transmitter & receiver

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

Question by ItsDavid001   |  last reply


i need help wiring a lighted rocker switch to a transformer. Answered

I have a power board from a guitar amp that is missing its AC power jack. The Lighted switch and transformer are still there but all of the wiring has been cut out and i am not sure how to wire it back up. I took the three prong jack out of an old computer power supply and am having a hell of a time figuring out what the correct way to wire this up is.  The switch is an 8A 250V lighted switch with 3 posts on it, the transformer has a white, black and brown wire (center), of which the brown was coiled up and zip tied not in use. The white wire has a corresponding 0V on the top of the transformer, the brown 100V, and the black 120V.  An explanation of what wires should go where would be sweet. Thanks in advance.

Question by strebor71   |  last reply


How can I wire a recorder cut-in box?

So, a little background: I'm a reporter, and I do a lot of telephone interviewing. There's currently not an app that works reliably for my phone to record both sides of a call, and given that I already have a very nice standalone voice recorder (sony ICD820) that has line in/line out functionality, I'd like to have a way to run the signal from my phone into the recorder, record it, and then pass it on to a headset with a mic on it. The problem is that the recorder only has 3.5 mm stereo in/out (TRS), with no separate mic channel, so if I connect the (TRRS - mic/l/r/ground) cable from my phone directly into the recorder, then connect my headset to the 'line out' port, it ends up distorting badly, and not recording the mic channel. As a temporary solution I A) use two "Y" cables (one connected to the phone, and one to my headset) to split the mic from the audio channels, then B) feed the audio channels into and back out of the line in/out ports on the recorder, and then C) use a coupler to mate the two mic channels. This puts the recorder in-line on the audio channel(s) only, and routes the mic channel directly from my phone to my headset (picture attached). This works great, but it's bulky and delicate, and obviously only records the incoming side of the conversation.  THE QUESTION: How can I wire a box that will give me the ability to "cut in" a recorder on a TRRS source, which is delivering (potentially) stereo audio channels along with a mic channel - ie, up to three channels - so that the recorder is recording all three channells? (note: it does not matter if some/all of the channels are merged). WOULD IT WORK TO wire a box that A) summed the Left and Right channels from the phone using resistors on each channel (see the picture in the link), and B) fed the summed audio and the mic lines into the Left and Right pins of a TRS plug, respectively, to give the recorder a stereo source? I have put together a crude diagram of what I think this could look like (note that the diagram includes a DPDT switch to 'cut in' the recorder, but I would likely omit this in the final design for simplicity). Additional question: I have seen wildly varying info on what size resistors to use on the summing circuit, and also conflicting information as to whether I need a third on the ground (???). The simplest I have seen is just using a 1K resistor on each of the incoming channels. Given that these are just standard headphone/passive mic voltages, what size resistors would I need, and where in the circuit? Link to the simplest 'summing box' diagram I hve found for this type of application (top image): http://techtalk.parts-express.com/forum/tech-talk-forum/60443-stereo-to-mono-summing-circuit

Question by ThomasJ126   |  last reply


Help with On-Line Indicator for Jabra GN8530e headset

I have a Jabra GN9350e headset that I use at work, both with my desk phone and USB on my workstation. Jabra sells an on-line indicator (http://img5.jabra.com/sites/Jabra/GNImages/CCO/Documents/Datasheet_Jabra_Busylight_V02_1003_low_10116.pdf), but it's just a plastic stick that lights up at the top. No one will understand what it is, or what it means. I intend to build an LED box that says something to the effect of 'ON A CALL' with a chasing border to get attention and deliver the message that, well, I'm on a call. The tricky part for me is that I can not tell what type of connection is used to connect the device to the base station. I know it is a 2.5mm TRS connection, but am unsure if it is stereo or mono flavor. I am also unsure what the actual signal would be - is the sleeve is ground, tip signal, etc. I have spent a few hours searching the web and found nothing. My end goal would be to build a plastic box to house the indicator assembly, with mirrored plastic on the front so that when the indicator is off it would appear to just be a black box. When active, there would be a chasing light border (two or three LED sequence, just regular chasing lights), and a solid on field in the middle with verbage. I'm good with a soldering iron, but new to this kind of build. If someone could assist / recommend how to proceed in building the circuitry that could connect the LED's together (sure I can find that information on this site elsewhere) that would be nice, but primarily I would need help interfacing the indicator with the headset base station. Thanks!

Question by jon.hazlett