Building a Stereo Tube Amp

I'm in the UK and interested in Building a Stereo Tube Amp (by thobson in audio). Can anyone advise on the UK equivalents for many of the components used in this project e.g. transformers, valves (tubes) and where to buy them? Many thanks.

Posted by DonaldStott 1 year ago


New Stereo

I was outside the other day and my neighbor gave me this stereo. It's a sony with 2 working speakers, 51 disc cd changer that also acts as a storage(you can turn the holder w/on of the dials on the stereo, am/fm radio, 2 tape decks, sounds great, and i hooked my sansa up to play through the speakers. Check out the pic below.

Posted by sardines454 11 years ago


Converting a stereo system into an amplifier

Right so I have a Ministry of Sound, MT2, Power Tower, HI FI System. It has two external speakers which are fairly crap and a decent sub woofer. I want to take out the sound board and the screen interface, des guard the tape and CD player and remount them into a new housing. Currently the output sockets are 3.5mm headphone sockets which the speakers which came with it originally plugged into. However I have much better quality bookshelf speakers which I want to hook up. Is it possible to hook up my new speakers effectively turning e self contained stereo system into an amplifier?

Posted by Lopan 3 years ago


I highly reccomend

I just hooked up an outlet that I've had in my wall since I've re-dry walled my room, and it's by itself on a single wire, I just hooked it up to a breaker isolated from the rest of them on my panel, and have JUST my stereo plugged into it. All of a sudden my distortion problems I was having at near full volume are gone. I highly recommend running your stereo on a seperete outlet for you audio freaks out there!

Posted by Punkguyta 11 years ago


help with car stereo head unit

Im having issues with my radio it has bad static.. finally sick of it i started to test.. tested resistance on antenna on the ground to the unit.. looked good. turned it on and tested for 12 v on red and yellow wires they were good i happened to put it on the ground with the car on and i get 10 v on the ground i also get 10 v on the head unit case.  when i unplug it everything goes back to normal.. cannot figure this out and any help would be great.

Posted by randrews-10 2 years ago


Aux only DIY Car stereo

Hi I bought an old car recently. But came with bad stereo head and perfectly working speakers. Now I figured out that all I need in my stereo in aux input which I can connect to my mobile device. Is there any way to make an aux input port without using any radio head, ie, the direct connections with AUX. also please explain wiring layout of head.

Posted by vipul_agg 4 years ago


Hook up stereo speakers to computer for surround sound

Alright, if theres already an instructable on this, I apologize, and could someone point me to it, otherwise, here's my question: I have a set of stereo speakers, the ones with the clips that you use to hold in the wire, so it has no plug. The only stereo set I have has no outputs, no white and red RCA jacks, or anything, and I do not have any other reciever. Is there any sort of adapter I could buy or build cheap (easily, preferably) to let me plug two of those into a standard 3.5 mm miniplug? my goal is to use those as rear speakers for my computer's 5.1 surround, as they have good base and treble, and my 2.1 channel set that I was using there crapped out. Thanks!

Posted by shadthehedgehog 9 years ago


Valve/Tube Amps

Hi, I am currently designing a stereo/mp3 amp for my education and I was wondering... Is it possible to incorporate a Valve/tube into a conventional stereo circuit? (like a standard valve amp but smaller and without the Equalization effects) I suppose the Valve/tube watts would have to match the speakers, but is this possible or would I have to use a circuit from a guitar amp that is already paired with a valve/tube amp system?! Much appreciated. -Rob

Posted by RobertChallingsworth 6 years ago


Amp from an old transformer.

My old home stereo was broken and I got a new one as a gift. I want to use the old speakers and transformer as an amp for my home office Is this at all feasible? If possible could you point me in the right direction?

Posted by DavidMF 7 years ago


Fixing my headphones - can't identify the leads

I am trying to fix my headphones - the connection to the jack got a little damaged from using it over time. so i cut the existing jack off of the cable. the cable is stranded wire, so i'm having an awful time identifying which is left, right and ground. i will try to post a picture soon. 

Posted by mrtunes 6 years ago


What would be the best amplifier for these speakers?

Hi guys, a few time ago I needed a set of speakers for my PC so I brought back to the light two speakers from my old Philips Hi-Fi ( http://imageshack.us/photo/my-images/216/28505497yt5.jpg/ ) and a set of 2 broken PC speakers that I didn't throw away when was time to... So, long story short, I used the PC speakers circuitry to supply my Hi-Fi speakers and plug them to my PC. Now I was thinking if there is any way to give a better supply to these speakers in order to get a better sound. Speakers: FB 545 PH Impedance: 6 ohm Watt: 100 Thanks  :)

Posted by Nimrail 6 years ago


How to mix stereo & mono inputs for XBox headsets

Does anyone know the best way to merge/mix a stereo input and a mono input so that the stereo remains stereo, but the mono input can be heard across both ear pieces? I've got a project in mind to create a box which will do this for using normal headphones for my Xbox 360 in-game chat. I'm just not sure if I need to isolate the mono input with a diode so that it doesn't turn the stereo input into mono.

Posted by WildBlueRhino 7 years ago


car stereo

can a car stereo (headunit) b powered with an xbox power brick without an amplifier? if so how do you wire it up, i can get the power light on on the head unit but it will not switch on, anybodys help would be appreciated

Posted by sniperkrule 7 years ago


Any thoughts on this method to power a car stereo?

OK, I've seen several posts of using computer power supplies and 12V wall adapters to power car stereos.  I was about to recycle an old portable cd player when I noticed that the power rating was 12V.  I haven't cracked it open yet to see how the power supply is wired, but could the power supply from this stereo be used to power a car stereo? 

Posted by RicoSPD 2 years ago


Convert stereo to mono? - creating 3 channels, mono, left, right

I have a little problem.... i want to convert Left, Right channels into 3 channels, Left, Right, and Mono is it possible to build this with a couple diodes? Thanks in advance!

Posted by Sandisk1duo 10 years ago


Audio

Looking for some help with an audio issue in a museum kiosk. I have a small 10 watt stereo amplifier running a single 8 ohm speaker. My audio source file is in mono and need to keep the single speaker. Using shielded stereo audio cables. There is a faint amount of static coming from the speaker. Is there a way to reduce this noise/static?

Posted by jimboothdesigns 3 years ago


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 :)

Posted by tap 8 years ago


Soud proofing from cd player

Lo all, need some advice. How would i go about cheaply "soundproofing" my stereo. My grandmother lives downstairs and gets bass reverb from my ATR and Lamb of God cd's. any advice is greatly appreciated -Nick

Posted by supersith22 10 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 10 years ago


Noise Pollution B-Gone?

I liked the TV-B-Gone Instructable, it was entertaining and informative. Now I wonder if one could "snipe" one's neighbors' stereo set while they are playing Slipknot full blast at 3 am? (Calling the cops only does so much, I'd rather hit a button and go back to sleep.) I only have the most vague understanding of EMP technology, is that a possible/plausible implement for a solution? Or is there something else?

Posted by V-Man737 10 years ago


Im not even familiar with electronics but I would like to reuse this Bass AMP HB-20B

Hello, I have recived an Bass amp from a friend , obviously since the TDA2030A chip went wrong, his friend built new one amp and gave me his amp.The chip is the one mentioned is up typed, still works fine, now What Im trying to do is make stereo, since the Bass amp is mono,https://www.petervis.com/Electronics_Kits/TDA2030A...This is the site , I only need to make bottom circuit, but the issue is that this one is prebuilt by manufacturer and has volume knobs, Low, Mid1/2, and high equalization, has input 1,2.I mean this https://www.thomann.de/gb/harley_benton_hb_20b.htm(note about this link, its not that correct one)It sounds good for my usage, but since I wanna add another chip of it and make it stereo I need help, since Im complete idiot, and I wanna keep the Equalization.Here are few pics.https://ibb.co/c7wbcehttps://ibb.co/ktuwceI hope you understand me.Thank you!

Posted by Albert1999 8 weeks ago


usb face plate

Does any one have a line on a usb face plate for the front of a computer? im looking for some thing that would replace one of the removeable slot covers on any computer. i have a car stereo that has usb hook up for flash drives but it looks ghetto with a usb cable hanging out from the dash. i only need 1 usb slot so i guess i could just cut a multi port on up....if i could find one. i checked rs, tigedirect, bestbu, circuit city, and a few build your own comp shops and cant find the usb plate i need. i have a cable with the female end on it and i guess i just need on of these plates to plug it into and flush mount it to my dash steve

Posted by cruisermedic 11 years ago


stereo to 5.1

Ok hello... here's my problem... I bought a 5.1 speaker system they were extremly cheap... now I want to plug them nto my ipod video or my stereo jack from my pc... any ideas? please help...

Posted by mojojojofilmmaker 10 years ago


Mono Bass in Stereo System

Hello Everyone I'm building a portable amp system running in stereo, but I only have one Bass speaker. Each Speaker (5, left/right tops, left/right mids and the bass) has its own amp. How can I connect the input on the bass speaker to the (stereo) input while keeping the channels separate? Thanks. 

Posted by IronCake 1 year ago


Stereo Stolen!

My car stereo was recently stolen.. Bummer. Here is my idea; I am tired of putting stereos in my car only to have them stolen. I don't want to buy another CD player w/ an aux in input for my mp3 player, since I don't really play cd's anyways. What I want to do is install just an aux input line to my car speakers and mount that easily in the empty hole. Is that possible? Do you somehow need to power the speakers? How do you go about doing that w/out buying a new stereo? My main goal is 1)to put something there that will run the sound from the MP3 player 2)not need a stereo to do it. 3)do this so no one would think it is something they could steal and profit from. HELP! :)

Posted by Gopherwood 10 years ago


Car Stereo in home

Ok, im new to all this and i was wondering if i can connect my car stereo to an xbox power brick dirrectly without any amps? and just run 4 speakers off it like its ment to? anybody any ideas on how to do it? THe actuall power cables for my stereo are: Red : Power (+) Yellow (fused) : 12v+ memory Black : GND what wires would i connect to them from the xbox power brick? i have 3 yellow, 3 black, a red and blue wire. Your help would be much appreciated everyone.

Posted by sniperkrule 7 years ago


Home made stereo photography

Hello people, maybe you can see my 3d photographies of Patagonia. Unfortunately, the page takes a while to load.  You will be using Google Translator for read it in English.  I you don't understand something, please tell me so I fix it (if I can). The original page in Spanish is www.rimar2000.com.ar/3D

Posted by rimar2000 7 years ago


What to do with an old stereo/casette player?

I have an old stereo/casette player and was wondering if anyone had any ideas on what to do with? If you put one forward that I like I will make an instructable on it. (My first one!) I was thinking about turning it into a set of rather large computer speakers, any ideas on how I would accomplise this? Any Ideas welcome. Yours awesome-ly punkzombiehunter

Posted by TerminalDragon 8 years ago


Touch Screen Control for the car

Hello, Has anyone thought of replacing all analog controls in a car dashboard, e.g AC, fan, stereo, vent, defogger etc and replacing them with a touch screen that integrates into the dashboard (like the expensive cars). As an example I have included two jpg's Here is what is required: Aluminium milling of the housing Touch screen sensor integration AD converters more...

Posted by razausman 5 years ago


Help! LED series with Speaker

I recently got a little old stereo which I've been cleaning up/painting/tuning/etcetera. To me this thing is just so darn cute and I got really excited when I noticed some LEDs under the speaker grates. However they only light up when the volume dial is up to 9 or so, and the stereo is just way too loud! 1-2 on the dial is what I would consider a medium volume level, and don't see myself ever going much higher. I would like a way to fix the dial discrepancy, but I feel that I can live with it. What I'm really after is a way to get the LEDs on at a normal volume level. Ideally pulsing with the music(like they can do now.) I've included a picture of the circuitry. Let me know if you'd like a picture from the other side and I can take it out. I'm a super novice at this stuff. It seems like the LEDs are in a series(btw, each little circuit board is home to three leds, for a total of 12) but that the whole series is actually parallel to the speaker itself? Or is it all in series? Anyway, my first thought was to leave the blue wires going from the LEDs to the speaker, but to move the black 'power' wires to the end of the last LED series so that the power would go all the way through the LEDs before getting to the speaker. Is that a bad idea? haha. I'd rather not burn these LEDs out since they match the colors of the stereo. What do you think? Thanks in advance! Diane

Posted by foodcoloring 5 years ago


Hommade quad tape deck

I love quad as an audio format. I've been recording in quad a lot recently on my tape multitracker. It uses regular cassette tape, and the regular track widths, but uses all four at once instead of two each way. Trouble is, it only has stereo mixdown, and it records at twice speed, so I would need to modify any potential quad tape deck that I build to play at twice normal speed. I've figured out a way to use a 4-part RCA signal, if ran to two stereo amps, to get quad sound to my speakers. Therefore, I would need to modify my homebrew quad tape deck to have 4-part RCA out. I'm still a little fuzzy on the particulars of that. In order to read all four tracks, I'm considering just taking two stereo heads and putting them next to each other, but due to width constraints, that would probably mean being unable to sync their output, let alone record anything. I suppose I could yank the quad head out of a junk Tascam, but good luck finding a junk Tascam! Any ideas on solving this issue? Perhaps work in an output lag somehow on the forward head's output so that they are synced again? One idea that I have, if I can get the outputs synced, is to just pull the head out of one tape deck and make the wires long enough that I can install it in the other deck, still attached to its own electronics, though. Then there would be four RCA jacks out (two from eah machine) and it would require the minimum amount of hacking things up. Then I'd connect the two cases in to uber case (duct tape, porbably), and go on my merry four-channel way. Anyway, is anybody else a fan of this format, and have you thought about making a quad tape deck? If someone has ever ripped up analog tape decks (or knows the nitty-girtty of how they work), please don't hesitate to give some input to this project!

Posted by Rishnai 10 years ago


How do I power these amps??

I've got these two car amps (see pictures below) that I was given along with the sub that some people already know I have. I was thinking it would probably be better to use one of these amps instead of the one I'm using now but I can't figure out how to power it. I know it's 12v obviously but I'm not sure what to use nor do I know how to get it on in the first place, as there is a remote wire on both amps so that it isn't on draining your battery (in a car of course) while the car is off, is there somewhere I would short this lead? Again, see my pictures below.

Posted by Punkguyta 11 years ago


Multiple audio input to 1 stereo output

Sounds confusing but I need to connect 7 audio players (stereo) together and have 1 stereo ouput. Without volume sliders. Each player audio need to be mixed and be heard at the only output. I was thinking on connecting all left channel together and right channel as well then connect each one to audio jacks (red/white). Can someone help? 

Posted by luisnperez 7 years ago


Portable car stereo

While waiting at a red light, I noticed that inside of a FedEx truck, the driver had his own portable car stereo in the cab with him. It consisted of a wood box with three 3.5" Dia speakers on the side with the stereo (what looked like an older model) sticking out of the top of the box, vertically. I'm guessing he had it wired for a cigarette lighter adapter to power the unit and the box was held in place in the cab by bungee cords. It looked like a great way to recycle old car electronics, wished I'd thought of it when I had to drive cross-country in a Uhaul with only an am/fm radio.

Posted by RicoSPD 9 years ago


Adding more speakers to hi fi stereo?!

Hi, i was just wondering whether anyone knew of anything that will allow me to add more speakers to my sony hi-fi without losing in volume. my stereo only allows me to add 2 speakers, and i have seen that you can get stereo speaker splitter allowing to add more speakers but i don't know whether one of those leads to a loss in volume aswell. I was wondering whether there is anything like a booster/amplifier to prevent the loss (almost like an aerial booster for TV's). Any help would be great thanks! Dan

Posted by Dantallica 8 years ago


6vDC Stereo Audio Amplfier

I just acquired a new, unused 6volt rechargeable battery that is rated at 12Ah. I'm looking for a Class D amplifier that'll run off said six volt battery. I've looked around but unfortunately all the amps I've found are either too low power output, or too high of voltage. I'd like to be able to get an amp that can output somewhere between five and fifteen watts stereo. Does anyone know where I could look?

Posted by Knuxz 6 years ago


Questions about computer stereos

Hi! I'm building a portable amplifier from old computer-speakers and I have a couple of questions about them. 1. How do I make the stereo-speakers mono the best way? 2. Is it possible to make low- and high-pass filters to a simple amplifier as the computer ones? I thought I'd connect one bigger speaker (a whopping 5" one!) to amplify the low frequencies and one small to amplify the high frequencies. This would work the best with a 1-channel amp. Thank you in advance, hope you understand what I'm looking for! P.S. Please move the thread if it is in the wrong category, wasn't sure if it suited better under "music" or "tech".

Posted by Henell 10 years ago


Electronic sleep timer for my car stereo

I live in my campervan and often listen to music before I go to sleep. I have a Sony CDX-GT470US carstereo and Sony RM-X4S wired remote for it. here is a schematic for the remote www.panuworld.net/minidisc/fordsony/rm-x2s.gif It has also a wireless remote so when I am in bed I can turn it off with it unless I have fallen asleep. Sometimes I wake up in the middle of the night with the radio still on. This wastes power and might flatten the battery. So I need some device which attaches into the wired remote parallel to the off switch. Then some type of timer circuit which gives a 2 second pulse to short the contacts to turn off the stereo. Any ideas appreciated.

Posted by pellepeloton 8 years ago


OP-Amp Troubles

Hey everyone I was hoping someone here could help me with a problem in having. I've been tinkering with some op-amp circuits with the LM386N-1 namely the one I have pictured. I first assemble them on my prototyping station and they work well using the signal generator but when I connect them to a audio line from my computer nothing comes out the speaker I have tested the cable and speaker and they both work so I am at a loss as to what's not working. I would appreciate any help you guys can give me thanks

Posted by juggalo_assassin183 10 years ago


How can I wire my boombox?

I need help wiring a car head unit for a boombox I am making. The problem that I'm having is that to save my settings, the head unit needs a constant 12v supply. Currently, I have a computer power supply going to the head unit supplying the 12v along with 5v for a PC fan I am using to help with cooling. The problem is that I am planning on putting in a motorcycle battery and switching between the power supply (wall power) and the battery (portable). I need all components to run off of either power source and to be able to switch between them without overloading the system or losing the constant 12v. Please help and sorry if that didn't make sense or was too complicated.

Posted by eliweitzman 2 years ago


Motion Sensor Mp3 Stereo PLayer

How would I would I go about making a Motion Sensor Mp3 player using my Stereo.  I want to have the ability to play an mp3 file using my Stereo when people pass nearby the sensor.  I want something loud and very realistic.  I am unsatisfied with the reviews of the below mentioned products.   I want to be able to play the mp3 file - motion sensor using my stereo player. https://www.amazon.com/dp/B071YFP2GG https://www.amazon.com/Mini-Motion-Activated-Audio-Player/dp/B019R07FR4/ref=sr_1_7?ie=UTF8&qid;=1505256883&sr;=8-7&keywords;=motion+sensor+mp3

Posted by WesleyK18 1 year ago


Stereo Amplifiers, Will they power HHO Generators and control Heat?

Will audio amplifiers work to power HHO Generators on vehicles to control over heating of the cell? If so what other parts would be necessary?

Posted by Pylgram 10 years ago


need instructions for connecting and using stereo speakers in multiple rooms

I have one stereo and a set of stereo speakers in two different rooms (bedroom and living room). Sometimes I like to play the speakers in both rooms (fill the whole place with music as I move from room to room)but sometimes I like to turn them off in one room and leave them on in the other room. I do not want to buy new equipment just want a VERY SIMPLE switch box to switch off the speakers in one room and leave then on in other room. Anyone know how to do this?

Posted by Linda Cooper 9 years ago


TDA2822M project

I have a genius vibration headphone .but the vibration is mono . so i wanted to mod it and make it stereo . when i opened it up i saw TDA2822M ic driving those vibrators and they are connected in series on ic's output .i knew 2822M is a stereo type amp ic .so i connected those vibrators in parallel (ground to left  vibrator & ground to right vibrator ) but the result is same .i checked the inputs but they are not connected as one (stereo) . help me pls..

Posted by prinjel 1 year ago


Play an iPod through an EMUD Tube Radio

I have a beautiful shortwave/AM/FM/turntable EMUD brand (Germany) console stereo that I love. Currently, the radio's not working, but I think I can get that fixed. I'd love to add the capability to play my iPod through the speakers. The iPod doesn't have to be integrated into the stereo, it could be something where I just plug and play through the stereo's speakers - if that's possible. Any help? Thanks in advance.

Posted by smtownfun 9 years ago


Car Sterio, without the stereo

So here is a question that I'm sure somebody knows how to make this work. I have a Jeep, and I never listen to the radio or have a need to play CDs. So what I want to do is rip out the stereo and mod in a female headphone jack so I can plug in my iPod. I don't see the need for a stereo anymore, so if I could just have the ipod and speakers I'd be happy. I know there is going to be at least one issue, which is the iPod wont be able to drive all the speakers, so some sort of homebrew amplifier will need to be built. Anybody already done this or at least know how to do this?

Posted by The Dark Ninja 9 years ago


Putting a 1/4in Stereo Jack into a computer :)

I'm thinking this will be my first instructable. I plan to put a 1/4 in stereo jack in the front panel of my PC. I can do that. The problem is, I need to figure out a way to amplify the sound, since my 30-year old earmuffs use a 1/4 inch jack and suffer from low power. I'm thinking USB power. Any suggestions? I know comps, I know how to do this, I just know nothing about amps :)

Posted by mikesty 11 years ago


3,5mm male stereo mini plug source and quality query

hello folks, my son keeps bending the wires of all his headphones, causing them to start cutting out in either one or both channels (and now he has done it on one of my nice sets of headphones).  i was wondering if anyone could recommend a place where i can buy them in quantity.  my other question is whether there have been any improvements made in the ease of soldering.  i would think that so many headphones go bad at the jack, probably by pulling, that someone would have invented an "easy-solder" jack.  given that isn't the case, maybe a recommendation could be made on at least a sturdy plug with some sort of stress relief built in?  the large quarter inch stereo plugs used to come with spring coils. thanks for any suggestion, recommendations, comments, etc!

Posted by jhudak 7 years ago


Audio Stereo KILLSWITCH without NOISE when switch pressed

I know there's a lot of Killswitches to build but I need one that will shut my loud music gentle without the "unplug" noise, may be some components attached to the switch will make it. Any suggestions?

Posted by luisnperez 7 years ago


MP3 unit for car

Hi everyone, I was wondering if I could get some help with a project I'd like to make. My truck's stereo died, and instead of getting another stereo, I'd like to make a unit that just uses my MP3 player. Junkyard stereos are of dubious condition, and usually overpriced, and I'm too cheap to pay for a new stereo. I never really used the radio or CD player on the old unit; I just want basically a jack for a MP3 player/laptop, volume control, and power switch, powered by 12V and able to be hooked up to 4 speakers. I have some basic electronic knowledge, but not enough to make something like this. Could someone maybe, possibly, provide me with a diagram or ideas to get this started? Thanks a lot!

Posted by Braunchitis 8 years ago