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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.

Topic by tehaceofspades  


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?

Topic by jimboothdesigns    |  last reply


Amplifier

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 ;)

Topic by arnoutdejans    |  last reply


Simple audio amplifier?

Alrighty, I'm a n00b to this world but I'm really into it. I just bought a simple amplifier kit and put it together. It is a stereo amp but I am only getting output to one speaker. The only problem I can think of is how i rigged up the inputs. I took a 3.5mm jack and combined the ground from the left and right channels. Can you not do that? How do I fix this without running two individual mono channels? Thanks in advance!

Question by abroadhead    |  last reply


audio amplifier transistor? Answered

I pulled what looked like a voltage regulator from a PSU, i guess as it turns out its not? apparently its a audio aplifier transistor, but what would that be doing in a PSU? if its any use, it was near a fan connector on a small sub-board... markings are: UTC 2SD880 (2 small, undistinguishable letters)RKOB (or 0B) i believe this is the datasheet, correct me if im wrong. http://search.alkon.net/cgi-bin/pdf.pl?pdfname=utc/2SD880_TO220.pdf

Question by zack247    |  last reply


Audio amplifier grounding

How to make proper grounding in audio amplifier circuit? How to have separate signal and power grounds?

Question by Amit222    |  last reply


Audio?

OK so i just thought of something, but I don't know if it can be done. Ive googled and such, but i was unsuccessful. Is it possible to take an audio frequency and create electricity? Similar to a solar panel, but the instead of taking light, i take sound. Ive seen on instructables those LED candles that play a song. You can hear it with a solar panel and an amplifier. I want to know how to do the reverse. Could I take a sound, and power something with it. it would have to have SOME power to begin with, i would assume. maybe a charged capacitor? maybe i would take a microphone and somehow convert it into power (not data) I don't know how to do this. Does audio have positive and negative leads when connected to a circuit? this is really cool. I could charge my cell phone by talking on it! I could scream at my light bulb for being turned off (due to know power) and watch it light! _could anyone please either post an instructable (and let me know), post a detailed explanation on how to do this, or post a link to said detailed explanationThanks!

Topic by schetleft    |  last reply


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: http://downloadcenter.samsung.com/content/UM/201104/20110420105805326/20070309090035250_X40_SEA[1].pdf thanks.

Topic by scastro10    |  last reply


Audio Amp Help Answered

I bought a small audio amp, and i am trying to make a high quality boom box type device, for my mp3 player, however i am not sure if i should use a speaker that is a higher wattage than the amp is rated for, or lower.  The amp provides 15 watts per channel, for two channels, so 30 watts between the two channels.  I have a few extra 100 watt sattelite speakers, could i use them?

Question by snowluck2345    |  last reply


About audio amplifier boards? Answered

I've brought TDA2030 amp board for stereo system(pictures attached). I can't identify audio input terminals. Experts please help me! 

Question by chrisjlionel    |  last reply


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?

Topic by post.haste    |  last reply


need details on audio amplifier

I want to design and implementation an audio amplifier, and i was needing your help. thanks

Question by mukundwa    |  last reply


Connect two audio amplifier ?

Hi, I would like to make a very powerful 80w bluetooth speaker, but the only great audio amplifier that I found has only two output for speakers. So I was wondering if it will be possible to buy two and connect the first audio amplifier to the second one ?  Cheers, PS : here is the audio amplifier and the speakers that I will use :  http://www.ebay.fr/itm/232053348992 http://www.ebay.fr/itm/272387157947

Question by EgeK2    |  last reply


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

Topic by mischka    |  last reply



Adding multiple transistors to increase the out put power of an amplifier Answered

Say I have a sony amplifier of 500 watt but I like to increase the out put power to 1000 watt if I add more transistors will it work. How practical is this can this be done. Thank youimage is just for reference

Question by Liam Kriso    |  last reply


Can 2n3773 be swapped with 2n3055 as an output transistor?

Can I swap 2n3773 in this circuit: http://www.electronica-pt.com/circuitos/en/audio-amplifiers/44-audio-amplifier-90-100w-with-2n3773.html

Question by Davis Lambert    |  last reply


the OUTPUT voltage of an mp3 phone jack?

I want to build a vu meter using the lm3914 now it it voltage coming to it is equal to 1.7v all the led with work so i need to devise that on 10 to know the lowest voltage to, turn on the first led. that's the clear part now i don't have an oscilloscope in my home so i cant know the out put of my Samsung galaxy ace4 / i want to know the out put so i can build an amplifier wish amplified the signal to  around 2v

Question by TN_inventor    |  last reply


Please i want to ask this, i know some one is gonna help me.?

Those it really matter if i led my circuits on a breadboard or those it make any change if i use another things ells from the breadboard? lets say i use something ells like for example a plastic or a peace of word. i interne to use a peace of plastic so i can use wires to let my circuits together from bottom. will the wires affect my work if its done correctly? And please could someone get me out of this doubt? those it matter witch company produces transistors, or those it matter the type of transistor, or those it matter the size, or those it make no difference. I am asking thing because i am unable to locate the B C and E on each no matte witch type i use, so i suspect it being the reason why i have been unable to complete my project. maybe it could be that i need to know by a means of testing through something? Please i am asking because i do not know. hope its not bored to say. I hope it will not disturb if i do not connect my circuits directly but through  wires to link to each of them.

Question by RdNard    |  last reply


can I use a transistor as a audio amplifier? Answered

Recently I decided to make a speaker pair to my computer, and I remembered that I already read in a book that transistors can be used to amplify signals. If I can use it to amplify signals please tell me how.

Question by tgferreira184    |  last reply


car audio installation

So I have recently purchased an 8 inch subwoofer from a garage sale, wich was already mounted in the box. It has 2 inputs, a red and a black. I currently have it hooked up in replacement of the stock passenger side rear speaker in my 1999 ford ranger XLT, and it works well, but is not very loud. My question is 2-fold. 1: how would I go about wireing the speaker so that it could be used in addition to both the stock rear speakers without decreasing sound quality or volume, and 2: How could I increase the volume of just the subwoofer without affecting the other speakers? I have heard that there are "bass amplifiers" that i could hook in line but have not seen where I could purchase/ build one. Schematics and links would be very helpfull! Thanks, Iloveairsoftstuff

Topic by the mechanical engineer    |  last reply


is this usable as a sond amplifier? Answered

I have this lm324 chip from a old stud finder, i searched for a datasheet and found this: http://www.national.com/ds/LM/LM124.pdf it says a op amp, so will it work as a audio amp? sorry. i have never used ics before, and i dont know how to really read datasheets much

Question by zack247    |  last reply


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. 

Topic by sbaltov    |  last reply


Audio - headphones

My daughter runs a Pre-school and uses a small cd stereo setup. The output is a pair of mono jacks (R/L) for speakers. I am looking to build a distribution box for up to 6 headphones. Thinking of one input (from the speaker jacks using a 2 to 1 plug) The headphones are mono 1/4 so those jacks are readily available. I do not know what the output is of the stereo system is but I doubt it is much over 5 watts (if that). Will I need some sort of amplifier? any thoughts on switches/switching jacks if not all are being used. Thanks for listening. guitar 52

Topic by guitar 52    |  last reply


Operational Amplifier not working? Answered

Hello, I'm trying to use the KA324 IC (which consists of four opamps) for amplifying an audio signal. I've tried almost every schematic from this website: http://sound.westhost.com/dwopa.htm and also from lots of other websites, but none of them work. If the output volume is Really low, the sound is pretty good, but very quiet. When I turn up the volume, the sound is really bad, I almost can't recognise the song I'm playing. The output volume is also not that really high. If I keep increasing the input voltage, the output stops increasing after a while. It's not really 'loud' at that moment too. I've connected the IC to 12V DC (between the two middle pins). The + input goes to the ground connection, the - input goes to my POT voltage divider of the input voltage. The output pin goes straight to the speaker. I also added a 100kOhm resistor between output and - input. Without that resistor, I hear nothing at all but I think that's normal. I've also tried the three other op-amps from that IC but no luck. Is this opamp just not ment for audio amplification? or am I doing something wrong? Greetings, Electorials

Question by DELETED_Electorials    |  last reply


Matching speakers to amplifier

I have purchased 2 Maxamp20 amplifiers (http://store.accusafe.nl/modules/versterkers/maxamp20-met-3-5mm-connector) and i am trying to match speakers to them, i've searched audio forums for information (that i mostly don't understand) and tried asking questions (that have been mostly ignored) and i think i've found appropriate speakers but i want to get a second opinion before i purchase stuff i might not be able to return. i don't have the space for and can't afford the weight requirements of a large enclosure but i want fairly high volume and wide dispersion so im looking at getting 2 of these PA horns (http://www.specotech.com/index.php/products/audio/item/542-spc40rp) to mount on top of a shallow down firing enclosure for 2 of these subs (http://store.accusafe.nl/onderdelen/luidsprekers/subwoofer/dayton-audio-sd215a-88-8-dvc-subwoofer-speaker). i know the subs work with that amplifier because they are used in Boominators (http://www.diyaudio.com/forums/class-d/104402-boominator-another-stab-ultimate-party-machine.html) but i have no idea about the horns. also assuming this setup is okay do i need some kind of filter or crossover (not sure of the difference) to split the sound safely between the midrange and the sub speakers?

Topic by ambientvoid    |  last reply


How can I determine if my LM386N amplifier chip is defective?

I'm following the National Semiconductor datasheet for an approximate 200X gain (very minor modifications), but I get no gain at all. I do get sound though, which makes me believe the chip may be working just fine. The reason I know I have no gain is if I hook the audio out directly into the speaker I get the same sound volume/quality. I'm using a 9V battery for power, a 10 microfarad capacitor to connect pins 1 and 8, and a 220 microfarad capacitor between the 5 pin and the speaker positive input. Here are some differences in the modification: 1.) I'm using a 4 Ohm speaker and not an 8 Ohm speaker, but from what I understand that shouldn't matter since this is just a matter of less resistance and not more. 2.) I don't have a bypass or a .05 microfarad coming out from pin 5. 3.) I'm using a standard RCA cable from my computer headphone jack to test, and clipping a 20 gauge wire to each to run into the breadboard. I'm really new to all this, and I've tried like 3 or 4 different configurations, but they all generate the same sound volume/quality. Any suggestions would be greatly appreciated.

Question by giantjamsandwich    |  last reply


i want to build my own amplifier for my car to power my sub. i would a 300 to 600 watt rating any ideas? Answered

I have a small background in electronics and i would like to build an amplifier for my car to power my subwoofer. i am having trouble coming up with a schematic that would work. i would like to accomplish 300 to 600 watt rating and i would like all solid state components if possible. i dont care to much about size as long as it fits in my escort. and i dont care to much about cost either do you have any ideas?

Question    |  last reply


How do i connect old speakers to mobile?

 Ok, so I have a very old speaker surround system (JVC MX-60). It plays only Cassets and cds which we dont use nowadays.However the speakers are huge. The clarity and sound is good enough to listen to heavy metal music. I want to connect these speakers to my mobile. But the thing is, i dont know how to . Now I am a complete noob when it comes to electronics. Based on my knowledge I need to connect these speakers to an amplifier . To do that i need to know the wattage. And I dont Know how to find out. I was going through the main unit(which is destroyed) and it mentioned that the speaker impedance is 6 ohms. Wattage is product of voltage and current. How do I find that? Multimeter perhaps? here is a few things that I want to mention -The speakers have two wires(black and red). Nothing is mentioned on the speakers regarding its power. voltage etC. - I dont have the manual. The device must be older than me. - i have uploaded the pics of the back side of the main unit http://imgur.com/qNBKWst Thanks!!

Question by rockz1991    |  last reply


Home stereo stopped working possibly has burnt out voltage regulator? Answered

Greetings, My Altec Lansing home stereo stopped giving out sound.  There is still fuzz audible from the speakers, but there is no musical sound whatsoever coming through the speakers.  It is a simple stereo but with good sound.  It has one input Jack which has always been loose and finicky; as long as I carefully plug into the Jack and make sure it is a good connection, the stereo has worked fine.  One day however it suddenly stopped giving any musical sound.  I decided to open up the stereo and look inside.  First I tried bypassing the input Jack since I suspected that was the problem.  Bypassing the input jack however made no difference, there was still zero audio signal coming out of the speakers (still only the buzz).  I then looked around on the motherboard to check for any oddities. Everything looked normal except for one Voltage Regulator.  It is a L7809CV.  It has three prongs and a built in heatsink. The point at which it connects to the motherboard is slightly burnt looking as it is discoloured. In the upclose picture you can see two voltage regulators, the one on the left is the one which appears burnt. I was thinking this is likely the culprit.  Would anyone on the forum have any feedback to offer.  Do you think this is the problem, and would replacing the voltage Regulator likely fix the amp?

Question by ootagun    |  last reply


audio amplifier don't understand wire schematic :/

Www.national.com/ds/LM/LM386.pdf   the one i am having trouble understanding is the 20 gain amplifier

Topic by pattyshaw    |  last reply


how to reduce noises of engine from bus amplifier system?

Hi all, I am designing an amplifier system for a bus which is serving all passengers like DAEWOO BUS at a time. this system is working good in normal case. but when driver accelerates, the sound of engine is mixed up with audio signal and causes a noise. I don't know how to remove this noises from my amplifier system. One thing to know that a common amplifier TV, and  mp3 player is used to amplify audio signals and next individual passenger will be served his headphone/ handsfree as individual headphone jack adjacent to his seat. Also all headphone with all seats are connected in parallel. I will be thankful if someone help me out in this problem.

Question by abdulrazzaq    |  last reply


Need help with making an amplifier

First of all I am only considering to make this amplifier I have not gone out and brought any parts yet although I have had a look around. If all goes well I will post an instructable of all the stages required to construct the amplifier.  I am looking to make an amplifier to be used with my computer and various other devices. This is the amplifier schematics I have had my eyes on.. I am new to all of this really but Ive been trying hard and eager to get this working.  Amplifier http://www.circuitstoday.com/2-x-60-w-audio-amplifier-circuit  I have designed this on Eagle PCB, need to double check the connections. Would be useful for some info on the width of the tracks as this was the element I was most unsure about. I am new to Eagle PCB so im not familiar with standard conventions and tricks.  Pre-Amp http://www.circuitstoday.com/passive-tone-control-circuit I have designed this on Eagle PCB, on a separate board again need to double check the connections.  Power supply  I Have got a basic 35v+/- dc supply schematic, it is based on a toroidal transformer, will probably need a inrush current circuit doing later. I have added the power supply components on the same board as the main amplification stage.  Frequency Crossover I have an idea of what I want to use, I was think a 2 way 2nd order Linkwitz Riley filter because I dont want some of the areas of the midrange to be lost, from what Ive seen on graphs, the low pass and high pass dip significantly closer to the crossover frequency. Ive selected some drivers that I liked. The tweeter has an impedance of 8ohms and a frequency response from 1.6khz to 20khz. The woofer has an impedance of 8ohms and a frequency response from 30hz to 4hkz. I read somewhere that it was ideal to crossover exactly in between the two i.e 2.8khz, let me know if you think otherwise.  Also Ive read up a bit on L-pads, would it be suitable/ worthwhile in this application? is it necessary to have the impedance seen by the amplifier constant, if so where it be? Ive looked up the components on a website supplying crossover and audio devices, there are many types of inductors and capacitors I am not entirely sure which type would be most suitable.  If somebody could help me out in designing the amplifier and understanding how all the circuits could come together I would really appreciate it. I  would definitely do an instructable of the construction of all the stages of this amplifier. Thanks in advance. 

Topic by Jarez Patel    |  last reply


I want to make a simple very simple audio amplifier

Hi people im a 15 year old south african,i want to make a small,very very very very simple and self powered audio amplifier that can work with cellphones.as i sed im 15 and i dont know alot about electronics,so please help me remember the amplifier must be as simple and cheap as possible just say capacitors and resistor and tel me how to make it self powered.thanks in advance,o and 1 more thing please tell me your email address because i might have questions

Question by Salesh    |  last reply


How to increase/amplify the load of my mini audio compo music system cause.,

I wanted to add more speakers, if I add more speakers the sound of existing speakers getting weak., is it possible to make our own amplifier... if yes How? and I know it is easy to find a proper amplifier from the market, but I would like to make my own..if possible..

Question by roshan2    |  last reply


what is the purpose of capacitors in audio amplifiers? Answered

I want to know this because i want to convert a guitar amp into a bass amp and ii need to modify the right capacitors

Question by theVader75    |  last reply


Passive amplifier with a transistor? Answered

It's possible to build a passive amplifier with a transistor? i have think about something that might work with a capacitor conecting the audio + to the transistor base. not sure if will do, and if it do i don,t know how much resistence is needed on the other end of the circuit. also i'm going to use 2 15 ohm speakers in series.

Question by matokage    |  last reply


Trouble understanding audio amplifier schematic Answered

I have been looking at audio amplifier circuits online to use in a small-ish speaker system I am working on. I found the circuit in the image which is a pretty straight forward circuit and has cheap/easy to find parts. My only question is where exactly do I hook the audio input. I am guessing I connect to the .1uf capacitor on the left chip and to the ground, but I don't know. Thanks for your time. the circuit is also here: bp2.blogger.com/_ztWtnthp5tk/RkW7cyJceRI/AAAAAAAAAK0/7-Gi_-bt-ro/s1600-h/circuit-TDA2003+Amplifier+BCL+%28bridge+amplifier%29+18W+for+CAR.jpg

Question by danlab    |  last reply


Amplifier for my car audio system?

I have 4 x 30W speakers as well a 400W subwoofer....I am simply lookin for an appropriate AMP to push everything....something under $300, PLEASE AND THANK YOU!

Question by ScoobyHD    |  last reply


How do I connect a car amplifier? Answered

I have a "300W" (actually 30W) mini amplifier. It has black, red and yellow wires for power.How do I connect it?

Question by slovenija    |  last reply


Should I ground my amplifier? Answered

This needs a bit of background info. I found this amplifier a year ago in the streets, by the trash, and I took it with me cause I like to open up things and see what I could get (it was obviously broken). I opened it up, and started looking at the parts. The connections are old-school, first time seeing those. I noticed that one cable was not connected, so I took care of it, and tried to power it up. For my surprise it worked, and I had to secure the plug, which had only red and black (+ & - I guess). Fast forward to now, I heard or read that anything connected to a plug should have the ground as well, especially if it had something metal. The amplifier is made of metal on the sides. I'm giving it to my uncle, but I don't want to give him in a dangerous state, so, should I change the plug again and put one with the 3 wires? How or where do I connect the ground? (I saw one connected to a screw in the metal part once) And most important, why? Thanks a lot, sorry for length and for possible grammar or vocabulary mistakes. TL;DR: Found an amplifier without plug, should I put one with ground? How? Where? and Why? THANKS!! I've got answers saying that ground on audio systems are complicated and I've been reading but it's so confusing, and I don't understand it pretty well... THANKS IN ADVANCE TO ANYONE GIVING ME SOME INPUT, I REALLY APPRECIATE IT!! :D

Question by SuperPollo    |  last reply


10W audio amp?

Ok, so i want to get this one audio amp to work, but i can't seem to figure out how to wire it! the first picture is a schematic, and i have NO idea what the connections are, 1, 2, and 3 the second is a picture of the amplifier chip

Topic by Sandisk1duo    |  last reply


Wireless cox box help (audio transmitter / amplifier)?

Hi, I'm trying to design a circuit that will replace the traditional "cox box" in a rowing boat. What I want to have is a wireless microphone that transmits to an amp that I can connect into the boat's existing speakers. I don't care about the stroke rate or timer features, just need the audio.  I can solder well enough, and even print pcbs others have designed, but I'm not too sure where to begin with the design. There are plenty of great amp projects on here, but how would I tie that in wirelessly?  Thanks!

Question by andrew.spencer.2    |  last reply


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?

Topic by Knuxz  


How can I build an amplifier to use between some large unpowered speakers and my TV?

 I have two large unpowered speakers (not sure of their ratings) and I'd like to build an amp to power them, since the TV audio out wouldn't be nearly enough juice. If there's an instructable for this already, that would be awesome.

Question by scheda    |  last reply


can i connect 2 amplifiers together (parallel) with the same inputs to increase the output power? Answered

If i have 2 of the same amplifiers or very similar, can i connect them to the same inputs and join the outputs together. will this increase the output power of the system? they are both old amps and are expendable. i have some fairly powerful speakers that will take double plus what the amp already puts out. - headphone to component audio cable (L/R) - split both the L and R channels - connect to amps and adjust to similar settings - connect both the R outputs into one speaker (making sure to match the +/-ve ) and same again with the L outputs.

Question by grimgroper    |  last reply


Connect two transformer in parallel? Answered

Hi... I want to know that can we connect two center tap transformers in parallel? both are same rating of 24-0-24v, 5a. I want dual supply (plus, minus 24V) for audio amplifier that I am planning to build. Can someone explain me all the risks, cautions, etc.? (I am new in audio amplification circuits)

Question by SaurIMX    |  last reply


Changing bluetooth identification data

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

Topic by arjunmenon    |  last reply


control Stereo Volume

I have an old style Cassette SONY x-plod car audio stereo player for car. i have removed main cassette section & replaced it with an USB MP3/FM board with remote control. I made this because i believe in SONY's amplifier so successfully tracked amp track to get source from USB board. But here i got a problem with board which forgets volume level & restores to 25 level(Default range 0 to 50 level). so volume is boosting at high at every start of player. Now i want to Analog stereo volume controller between USB board's output & SONY amplifier's input. so what should be the configuration for volume controller??? Output target for amplifier is 4speaker(2x150Watts[Front] & 2x180Watts[Rear]). Does my idea works?? if it works what is the configuration for Analog stereo volume controller.??

Question by chinnuabhi    |  last reply


How to and which direction to connect a resistor in an audio amplifier? Answered

Please there is this audio amplifier i have been working on, but have not been successful with it. i did check to make sure all my connections are OK. but what i am confused about is " dose it matter witch direction i connect my resistors" secondly "does it matter if i connect the resistor directly on the transistor collector arm or those it make the same if i use wires to make a longer connection? thanks. can anyone help?

Question by RdNard    |  last reply