How much maximum frequency and maximum power we can get from an amplifier. I mean what is the latest technology about amplifier.

Posted by m_uamir72001 5 years ago

Wanted: 1.5V Audio amplifier chip

Does anyone know an audio amplifer chip like the LM386 that runs on 1.5V? I'd like to amplify the output of the "Transistor Radio" Kit from Franzis. Thanks ! Mischka

Posted by mischka 6 years ago

Trouble using In Line Signal Amplifier

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

Posted by Sedgewick17 9 years ago

Amplifier mod

My old DVD/amplifier's DVD is broken so i thought i would convert it to a portable amplifier with some more inputs and stuff, anyone know where i might find blueprints or something so that i might easier figure out what's what? it's a Centrum Triton 110, (sucks, but then it doesn't matter if i mess with it) thanks

Posted by brunotheman 10 years ago

How to make a personal voice amplifier from a cordless phone or old cell phone

I know you all can help. Can someone figure out how to make a personal voice amplifier from a cordless phone or old cell phone? Thanks Pwfree

Posted by pwfree 9 years ago

How to make a personal voice amplifier from a cordless phone or old cell phone

I know you all can help. Can someone figure out how to make a personal voice amplifier from a cordless phone or old cell phone? Thanks Pwfree

Posted by pwfree 9 years ago

High Voltage Amplifier

I am trying to build a high voltage amplifier that will amplify an AC signal of approx. +-5V to a signal of approx +-100V.  I was looking into building a common-source amp using JFETs or a common-emitter amp using BJTs, but both seem to have an output waveform of 0V to +100V.  Is there a way to modify these amps to have an output waveform of -100V to +100V?   Also, if anyone has any better Ideas, please let me know. Mark

Posted by questionmark05 8 years ago


Hi all,  I got two 3-way-speakers (8ohm) from my uncle, but I don't have an amplifier. I wanted to use these speakers as audio-monitors for my pc. Is it possible to make an (easy) amplifier-circuit for this use? And do I need one or two circuits (1 circuit-1 speaker / 1 circuit-2 speakers)? Thanks for helping me out! Arnout PS: Sorry if my english isn't that good - I'm from Belgium ;)

Posted by arnoutdejans 6 years ago

Help with amplifier 5.1

Good day, I had a samsung HT-40X home theater; however, the main unit died. So, I want to use the speaker and create a new audio system. The speakers spec are in the picture attached:[1].pdf thanks.

Posted by scastro10 2 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

Help : LM386N Amplifier

Hey guys. I'm new to these forms so please bear with me. I am very new to Instructables and this is my first project. I am currently working on THIS INSTRUCTABLE: All I did is connected all the components as shown in the link. What I decided was to use an aux cable to connect my phone to input jack and connect my computer speakers to output jack. After connecting the 9v battery and connecting phone and speakers, all that happened was that led lighted up slightly and no sound from speakers. The moment I turned the volume of phone to maximum , LED started blinking still no sound. Plz help......:(  Any help would be greatly appreciated! Thank you :) Sorry for bad English...:(

Posted by Angads25 4 years ago


Ok, so I'm currently playing with the idea of making a "feedback clock". Except 1 to 12 is now replaced with 12 speakers, and only having one the hand which would have a microphone attached to the end of the arms. For the rotation of the arm, a geared DC motor. The problem I have is in the construction of this mechanism, so any help or thoughts would be welcomed. My original thought is constructing an amplifier with 12 outputs and 1 input. The input being a receiver, transmission coming from from the microphones attached to end of the arms. OR would it be possible to make individual smaller amps for each speaker and split take the signal from the receiver in to each amp? If I was to do a multi-channel out put amp, does anyone know what circuit design I would be looking at? 

Posted by Harol Erreip 5 years ago


Just a thought, but what if you added a sort of a funnel to the windward side of the box that holds the belt? Could that allow a single windbelt to get more power out of less wind? Of course that would also make it more susceptible being to torn apart by a strong wind, speaking of which, has anyone thought of some sort of safety mechanism that would keep it from coming apart like galloping gertie? p.s. has anyone thought about the dynamics of the belt itself? Does a wider belt vibrate more? How about length, is longer better, or do you eventually reach a point where adding length has a nominal effect on the power generation? What about power storage? Couldn't you have it charge a battery, like solar cells do, and then use some sort of power inversion out of that? And by what method is the magnet attached to the belt? What about guitar pickups? I mean a single metallic wire as the belt and the box around it containing some sort of magnet/coil setup. Is that too inefficient, or could something like that be done? Because that might be able to withstand greater wind forces, although a cylindrical belt wouldn't work as well as a flat one.... I think that's all for now. Sorry to ask so many questions, but this idea really interested me.

Posted by nickajeglin 10 years ago

Old Amplifier Challenge

Have a few old amplifiers around.  wondering what they can be combined to re-create. Best Re-purpose for 1 old amplifier... Thanks.

Posted by stephenblair 4 years ago

ideas for homemade audio amplifier?

I was interested in pursuing the Bike Stereo instructable but I would rather not buy the $30 amp. What are the general ideas behind making decent-quality amplifiers for speakers? I have limited theoretical/practical experience with op-amps and I'm struggling to apply these ideas to a stereo system. Any thoughts?

Posted by post.haste 9 years ago

Microphone to speaker amplifiers

I want to make a microphone to 8 ohm speaker amplifier. I have tried using the lm386 op amp, however, the results were poor. What other IC could I use for this project? PD: It would also be of great help if any of you could send me a schematic along with the new IC since I am relatively new to electronics and still learning.

Posted by MrB12 1 year ago

What to do with a LM1279N (110 MHz RGB Video Amplifier System with OSD)

I have dismantled a CRT monitor and I was wondering what I could do with the LM1279N (110 MHz RGB Video Amplifier System with OSD).Here's a link to the datasheet for it.BTW, What could I use the OSD settings for?

Posted by thermoelectric 10 years ago

Hardwire IR Extension to amplifier

Hello Instructables. This is my first post and would like to begin by saluting the work you all do, I love receiving the email at work showing the weeks projects. My problem, that I hope somebody has a solution to is this... I am building a false wall to house my fish tank and TV, ps3 etc however my amplifier is too large and does not fit into my project. The only way round this is to house my amplifier in the loft. In the wall I want to place the IR remote control Sensor. I don't really want to pay out for those 'eye's' you can buy online (nor do i think they would be compatible with my model of amplifier) so was wondering if i could just use some ordinary electrical cable to extend the sensor? I was worried cable might not allow this as it would probably add extra resistance to the circuit. Does anybody have a solution or suggestion that involves spending little or no money please? Thank you very much! Frankie

Posted by fhoward 5 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 ( ) 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

Guitar Amps

Apologies to Wario, we've hijacked your original topic...So here's a new one that (might) stay on topic... Wario's OP: Well all of you welcome to my little group, heres our first topic, Should there be an instructible about how to create an amplifier? I think so because they are always expensive to buy, to build one though would be fun as well as useful, now you tell me and everyone else your opinion.

Posted by gmoon 10 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

Is this an Microphone amplifier and how to make it by myself?

I don't want to spend 150 USD for this thing :), but I want to do it myself. 

Posted by sbaltov 6 years ago

designing and building power supply using pre amplifier and darlington transistors

am doing a project on building a power amplifier driven by a pre amplifier with normal darlington complementary power transistors for school and i have no idea of where to start with.HELP PLEASE sandra

Posted by sandy23 7 years ago

amplify your acoustic for under $10

If there is anyone interested in amplifying their acoustic guitar for under $10....If you already have the parts then for free.   It was a little experiment of mine a while ago and was very effective.  If There is enough interest then I will post the details.   No drilling if you don't want to.

Posted by fenderphil 7 years ago

Broken bass amplifier

Hey, I have this 10w bass amplifier for home practice. Problem is that it gives no sound through the speaker, but it works fine through the headphone output. I have Checked the fuse, which was ok. I have also connected other speakers to the amplifier to see if it is the speaker itself that is broken, it seems like it is not. Seems like quite a curious problem, but can it be fixed? It sure would be nice to play without headphones again.

Posted by Henell 7 years ago

How to pick best battery for amplifier?

Hello, I ordered this amplifier and I need to pick best battery for this amplifier. Would be great to power it for at least 3-4 hours on maximum volume (200W rms subwoofer and 2x50W rms speakers). I need lightweight battery and powerful battery, size does not matter, budget is low so nothing overpriced I do not want.

Posted by RobertasP4 1 year ago

heavier duty pocket amplifier

I was in need of a pocket sized powered amplifier, so I made this:, I need to run larger speakers off of it, 6.5" woofers, and I need to get decent sound out of it. When I ran more power through my pocket amp (6v. battery pack rather than 3v.) I fried the circuit and had to make a new one. Any suggestions for a pocket sized, powered amplifier that can power said speakers? the amp and battery pack must be concealable in a suit.

Posted by imanalchemist 10 years ago

Tech - Challenge

A challenge to all Instructables to turn an old amplifier into something new. Possibly combing several of them and rigging up something cool. Should be fun.

Posted by stephenblair 4 years ago

Speaker and Amplifier Wiring Please Help!

As you can see I have a car amp and some speakers, can anyone with speaker or amp knowledge please tell me (or even better draw a diagram :D) of the best (most efficient / loudest) way to wire all these up, the specs are as follows… AMP 2/1 channel amplifier Max power – 400 watt 4 ohm stereo – 2 x 75 watts RMS 2 ohm stereo – 2 x 100 watts RMS ROUND SPEAKERS (midwoofers) 4 ohm 25 watt RECTANGE SPEAKERS (tweeters) 4 ohm 4 watt Thanks for your help! (P.S my plan is to build a portable sound system powered by a car battery)

Posted by superrob 6 years ago


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

Changing bluetooth identification data

Hi I bought this bluetooth audio module from Now is it possible to change the bluetooth identification name, wch appears on the phone to pair, from what is mentioned. Thanks.

Posted by arjunmenon 4 years ago

Could this be used as a guitar amp or converted into one?

Http://;=STRK:MEWAX:IT&item;=190311640003Could I convert that into a guitar amp? Im thinking that because its mono and not stereo it should work fine? Any thoughts or suggestions?

Posted by jackillac92 9 years ago

Choosing a good bass amp

I need suggestions for a good bass guitar amp. One I have in mind is a Behringer Ultrabass BA115 600 Watt 1x15 Bass Cabinet. I'm looking for something good at around $150 USD. Any advice for choosing one would be nice too.

Posted by wingman246 10 years ago

audio amplifier don't understand wire schematic :/   the one i am having trouble understanding is the 20 gain amplifier

Posted by pattyshaw 6 years ago

Current Problems with speakers...

Hey guys, I've uploaded some pictures of my problem. What I have here is an attempt to add bass to my speakers - I'm a newb, so this isn't going so well. The music is comeing from an iDock, and is being routed in parallel to a set of computer speakers. The right speaker has volume & tone knob, the left is simply plugged into the right. I unplugged the left speaker, took the circuitry out, and connected its input & output to a larger bass speaker - quickly was I suprised with a smoking capacitor (lol how healthy!) so... what should I do, simply add a resistor? Edit: Note the resistor (brown red red = 12k? or 1.2k?) is only in series with the LED and is not affecting the bass speaker. I am just wondering how a bass speaker could draw MORE amperage than the small speaker without any circuitry?

Posted by GreenD 8 years ago

Power supply switch for boombox project...

Could someone help me with some simple wiring questions? I've built a little boombox using a Lepai amp and some speakers. At the moment the back is off the box that houses the amp, so I can plug in a mains power adapter, but I've got a housing for 10 x rechargeable NiMH AA batteries making a 12v battery pack with maybe 20 amphours of life in it. I've only just ordered the batteries so I'll see. However, I was thinking that I'd still like to have a socket that I can plug the mains adapter into. So I was thinking about mounting a DC socket on the back plate, and some sort of switch to select the power source. 1. Does the switch need to be a 3 position one? There's an on/off switch on the front of the amp, so maybe a 2-way switch would be OK? 2. Does the switch need to be some sort of special one because it's switching power. Would something like this one do? 3. The switch has 3 terminals. How do I connect it up? I'll have +ve and -ve from the battery pack, a +ve, -ve, and earth from the DC socket, and a +ve, -ve and earth going to the amp. ...or maybe there's an easier way of doing it? Thanks.

Posted by contadino 5 years ago

Daisy Chain Amplifiers?

I have a couple amplifier chips, and i would like to know how i could daisy chain them (connect them together for more power)i am using STMicro TDA7266s pdf i have tried putting amplifier chip in series with each other (not the outputs, but all the pins)help?

Posted by Sandisk1duo 9 years 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

iPhone charger connection to sound?

How do you connect an amplifier to amplify the sound through the charge connector and still be able to charge the phone for an iPhone4 instead of using the headphone out to amplify the sound?

Posted by bricabracwizard 6 years ago

'Can I connect 2 TPA3118 60w Mono Module to create a Stereo Amplifier?'

This is the only amplifier I had lying around and since it was a mono amplifier, it only accepts 2 inputs. By using two boards at the same time feeding the same signal wherein the LEFT channel and GND goes to the 1st board and the RIGHT channel and same GND to the second board will it work smoothly as a stereo amplifier creating a 120w Amplifier? ~(Also, I'm using only 1 power supply to power the two boards.)

Posted by Chloe_Lemaire 4 months ago

audio amplifier

HI, i have a bunch of transistors that i took out of an old cd stereo. I was wondering if anyone could help me figure out how to make an audio amp using one or two of them. I am really new to electronics and I haven't had much luck figuring it out on my own. The transistors I have are like little rectangles with a hole on top the kind that usually has a heat sink. some of the numbers on them are: B1344, B1342, k3053, D2012, i also have alot of capacitors ranging from .47 to 3300uf  these are 50 v and 30 v. I've tried other audio amp plans but im having trouble learning to read the schematics. Any help is appreciated ill make an instructable if i can figure it out.

Posted by tehaceofspades 6 years ago

Prevent Clipping and Hum in class d amplifier

Hey I got this amp. Now at large volumes, there seems to be clipping. Even though the amp is 20w, my speaker is rated for 25w.  How can I prevent it from happening, rather than never playing at high vol. Can it be done by AGC or Dynamic Range Compression or Noise Gate. In my case, which is a ready made pcb, how can I include such circuitry. Is it even possible. Also, while selecting an IC, what needs to be looked at that will suggest clipping would not happen, or which parts needs to be referenced from the datasheet which ensures preventing clipping. At large volumes, if I disconnect the mp3 player from the amp but keep the jack plugged into the amp, a high hum is heard. When removed, hum is lowered but not eliminated. Similarly, when track changes. What steps needs to be taken to eliminate them. All the time before actually getting into practical electronics, I was only looking at Power output, THD+N, Class, etc of amplifier. It is only after going hands-on, for the first time, that I can experience the real things which most matter. Appreciate for helping me become a pro. Thanks.

Posted by arjunmenon 4 years ago

Ways to accept bluetooth, USB, Airplay audio inputs to an Amplifier

Hi Please don't shoot me for asking this. I am getting confused. I am building an amp using TA2020, with guidance from datasheet. The input pins accept analog sources. I would like to know how to add Bluetooth, USB, Airplay input support to the amp, since their output is digital (if i am correct). Simply by adding different modules, would it suffice? Now also, where does I2S, DSP fit in. Thanks

Posted by arjunmenon 4 years ago

Making a set of iPod speakers from computer speakers.

I have a set of stereo computer speakers that run off a 9v power supply, I'd like to replace this power supply with a bank of 8 1.2v cells (9.6v) that I could recharge with the original (9v 94mA) power supply. First of all, would I need to regulate the voltage down to 9v, or will 9.6v be fine on a simple amplifier circuit? Secondly, would I need any circuitry to allow the 9v supply to charge 9.6v worth of cells? Would some kind of auto cutoff circuitry be necessary to prevent overcharging of the cells, or would common sense by not leaving it charging for long periods suffice?

Posted by Pir8 Pablo 8 years ago

100 watt sub woofer amp

I'm looking for or to make a 100 watt amp, I can't seem to find any. If you know where i can find one online or a schematic to build one please let me know! Also is it possible to resist or lower the amps from an amplifier or will I have to specifically get a 30 watt amp for the mid range speaker. I am attempting an "led music box on steroids" project hahaha.... basically what I am going to do is make a clear plastic box and put leds and speakers and a 6" sub in it. Kinda bored and looking for a fun project and this came to mind. I'm open to any suggestions to make it better or ideas on how to power the speakers. Thank you in advance! The sub woofer I'm looking to power and the mid range speaker Might think about putting a tweeter in too

Posted by zcm87 6 years ago

Installing a sub in a car

I had the idea to put a sub in my car. i bought everything (sub+amp). But first I tried to wired it in my car, my friend told me to look at my alternator to see if he could take the load. My amp and subs are 600W rms. So I,ve look at the specification of my alternator is an 80 amp. Its the only thing about alternator I saw in a lot of diffent specs.\ So. 80 amp alternator 600W rms amp 600W rms sub Could my alternator could take the load???? thanks!

Posted by johnybody 8 years ago

110v to 12vdc conversion

Ok so long story short i want to make a serious home theater system. i have all the amps and speakers, but they are from a car. so i will need to run them from 12ish volts from my home outlets. so i cam wondering what kind of adaptor i should be making or using. i see pre-made ones that have an output of 12v with their amps ranging from 3-15 and watts from 3 to 300. i am no electrician and have little electrical experience, so i am wondering if i should go with more or less amps and watts, i dont need to fry anything as the amp and speakers i have are expensive! THANKS!  

Posted by mrmoose87 6 years ago

USB track reader and preamp.

I have one of the pox but useful Jensen microstereo's, and like most of these devices, they have a "hard limit" for memory sticks, of 16 Gig, but they also have a folder limit of 100 folders and 998 (?) files. This means that as I compile all of my interviews, lectures and sundry recordings on 16 Gig USB sticks - while the amount of data is below 16 Gig, the folder levels and amounts, and the amount of short audio tracks, exceed the internal filing systems capacities of the audio player. The other thing is that the idiots who designed the Jensen audio player did, was to create a file reader display that only shows the number of the track (more or less) and it's though a tiny DARK BLUE SLIT of a lense, that is highly directional - you can only see the track number at 45* above the unit's front. I would kind of like to bypass it and get a functional low power audio processor with screen that has a navibable directory system. Sure this is kind of available as a tablet, PC, laptop, smart phone etc., but I really just want a basic player that shows which directory - by name and number, and which file - by name and number, and has no real limit on the directory depths or file amounts. I also want a navigable interface. So aside from, repurposing an old laptop / cheap (pox) tablet etc., or a smart phone (?) as a single purpose non portable device, does anyone know of such an audio player, if it's made, who by and or where to buy it from, OR if there is one available some way by an Adurino (?) / Raspberry design that could come in at around $50 - $80 to build?

Posted by Wroger-Wroger 5 years ago


Hi Im new to the site and it is awesome Can someone tell me where in a speaker /radio/walkman is the amplifier as I really want to make one for a project Can you tell me how can I salvage an amp to make an Altoids amp powered by a 9V Thanks a lot

Posted by B_qwerty 6 years ago