Step 2: Build the circuit

Next step is to build the circuit. I used a TDA2822M amplifier and the schematic shown in its datasheet. You can choose to build your circuit with whatever amplifier IC you choose.

Where can i put potentiometer ?? instead of 10k or 4.7 ohm resistor?
<p>you can put a 1K-10K potentiometer between each the left and right channel of the input cable putting either terminal 1 or 3 connected to the left or right input channel and putting the other terminal to ground while connecting terminal 2 to the input of the circuit. This would create the resistance bridge from the audio input straight to the circuit as long as you make sure to connect one potentiometer on each of the left and right channel and make sure that terminal 2 in the one connected to the rest of the circuit. You cannot replace the 10K or 4.7K resistors because those resistors are part of the actual amplifier circuit and would change the operation of and may even cause issues with the rest of the circuit and cause a short.</p><p>Keep in mind this way, that I did it, means you will have 2 potentiometers, one for each the left and right channel</p>
<p>ive already placed potentiometer on that amplifier</p><p><iframe allowfullscreen="" frameborder="0" height="281" src="//www.youtube.com/embed/ORjqyL6hYuk" width="500"></iframe></p><p>But thanks for answering :D</p>
<p>How many Watts are your speakers?</p>
<p>10W 4Ohm <br>But amplifier cant give more than 3W (or 5W) in bridged configuration</p>
<p>What Wattage are your speakers rated?</p>
My IC got overheated and fried after three songs. Was wondering if you had to add heat sink or fan to circuit?
I want to know that how much volts are you using in the capacitors cause i bought 470uf of 16v and 100uf of 25v is it okay will it work please tell me how much volts you have used in the capacitors so i should replace them
<p>im a newbie in audio electronics so prepare for my Q. <br>what does that &quot;capacitor to ground&quot; doing at the VCC input ? <br>ty for your time :D</p>
<p>It's a decoupling capacitor. In this case it's doing two things. (1) Whenever you have a power line, you'll inevitably get noise (i.e. instead of getting, say, a nice 5V power rail, you'll get some random oscillations going above and below 5V). The decoupling capacitor filters this out by passing high frequency noise to ground and temporarily supplying power when the line drops below 5V. (2 - which is more important here) As you can see, the capacitor is placed between the integrated circuit's Vcc pin and ground pin. With any IC, you have to place a capacitor between the power and ground pins. Why? There are a few reasons. The first is that the IC's pin's and wires emanating from the pins act as inductors. IC's don't (or at least rarely) draw a constant current. Instead, they &quot;gulp&quot; current. And they do this <em>very </em>quickly. Power supplies are rather slow to respond to changes in current consumption - sometimes on the order of 10us. The inductance in the wires and pins compound this problem, so the IC may not receive the power it needs soon enough, and then it doesn't operate properly. A decoupling cap can supply this need current for the short amount of time needed while also neutralizing the inductance present in the pins/wires. Another reason it's there is also due to the inductance. Between pins/wires, you have what is called parasitic capacitance. (Adjacent pins will act as a capacitor). This is bad, because you can unintentionally create an LC circuit. 1/sqrt(LC) is actually equal to 2*pi*frequency. Guess what? You now have a very high frequency resonance in your circuit (you typically can't see them on a regular scope since they can be in the Ghz to Thz range). This also wreaks havoc on IC's. By adding a decoupling cap, you can minimize these frequencies and what now. Hope that answered your question.</p>
<p>Ty Mlagma :D</p>
I have a cheap alarm clock/Ipod dock and a guitar amp that I put together. Basically I replaced the little alarm clock speakers with bigger speakers, but I cant get the speakers to play any louder then it use too. it actually sounds quiter. Can anyone tell me how i can add an amplifier to it with the alarm clocks power source? urrrrgghghh
<p>well, you could build one (as somewhat shown above), or take one out of a different device. </p><p> either way once you have an amp take the wire that goes to your clocks speakers (output) and rout them to your new amp (input). then rout the output of the second amp to your speakers.</p><p>best of luck to you.</p>
<p>what if i don't have rechargeable battery? can i use usb port to connect it direct to computer as power source?</p>
<p>yes, just cut the business end (the one that isn't the usb), determine what two wires are positive and negative (it varies but red and black are common).</p><p>best of luck to you. </p>
<p>here is a better explained site for this <a href="http://cdselectronics.com/Kits/Stereo%20Amp.htm" rel="nofollow">http://cdselectronics.com/Kits/Stereo%20Amp.htm</a></p>
so this is very uninstructed, i got all the parts and went to put it together and CAN'T... isn't the point of this site to give STEP BY STEP INSTRUCTIONS? just wondering...
If you don't want to play with building your own amplifier circuit, the TDA2822 circuit used in this instructable can be found at the heart of many inexpensive computer speaker setups. The module is prebuilt and very compact, and often integrates the power switch and volume control. They can easily be wired for 6VDC (four common flashlight batteries in series; I suggest 'C' or 'D' size. Most of the cheap computer speaker sets have some pretty crappy speaker drivers in them, so putting some slightly larger speakers into a larger enclosure, like in this instructable, is a definite upgrade. You'd be surprised at how much better a fractional-watt amplifier can sound when given some decent speakers to work with!
its a stereo headphone jack so the red and green are the left and right positive and the gold are the left and right negative
Im kinda new with audio electronics, im using a headphone wire that is cut at the end for the input and it has 4 wires, 2 gold and 1 red and 1 green, if i use the green and red as the L and R input, where do the 2 gold wires go to?
Im kinda new with audio electronics, im using a headphone wire that is cut at the end for the input and it has 4 wires, 2 gold and 1 red and 1 green, if i use the green and red as the L and R input, where do the 2 gold wires go to?
if it is ok if i plug this amp with a 220v?
man every thing will just fry up and you wont be able to use it but yes you can use a 12 adapter instead of 220v <br>
man every thing will just fry up and you wont be able to use it but yes you can use a 12 adapter instead of 220v <br>
no it runs on 18 to 4.8 v
hasnainahmed101 is right&cedil;<br>
will the amp still play clear if i dt use a 10k on one of the input? BTW i hooked up everything right and the quality was terrible...
how i make the input go to one audio jack since they have 2 input and output parts for the amp.
The triangles are just parts inside the IC right?
the bold lines are ground, triangles belong to the IC
and do the thick black lines at the ends there mean they go to ground?
This may be a totally dumb question, but what are the triangles in the diagram representative of?
Please excuse me for being s bit uninformed on this, but what do you mean by 'RL'? What resistors can we put in, and is it still necessary with small voltages?
nice work !!
just built this amp my self with a few changes. <br>i changed the 470uf and 100uf caps to 220uf caps <br>just got to build another 2 then so i have a 6 channel ampf for my 5.1 set up
Hi,<br><br>I am just a Beginner with this from Pakistan so the thing is that I cant understand this one step 2... The graphical Diagram of the circuit can u just make it rough like by Hand so I can better understand this step...<br><br>I know i can manage to understand it latter on by reading some articles on Google about electronic Circuits but if u can just share one more picture using pen and paper without straight lines....
hi, at this step are you trying to say that i can build the same circuit but with other IC amp chip? i saw in differents instructables that every different amp circuit has differents components with some exeption like 0.1 uF capacitor. I would like to use a LMN386 that i can find in my local store but im not shure if i choose to use others components like this structables it will work. I hope you can help me
This schematic won't work with the lm386, you will have to use the schematic from the lm386 datasheet.
i need more specific instructions on what to connect to the IC, and where did you get your IC (TDA2822M)
I got the IC as a free sample from the manufacturer.<br/><br/>Here is the datasheet:<br/><a rel="nofollow" href="http://www.st.com/stonline/products/literature/ds/1464.pdf">http://www.st.com/stonline/products/literature/ds/1464.pdf</a><br/>
who's the manufacturer and how could i get a free sample?
You could get a free sample by becoming an R&amp;D department manager for a major corporation. It is illegal to sample from companies when you claim to be something you're not - i.e. an interested company, or student when you are not the one you said - and to sell a sample (whether as a part of a larger end-circuit, or as a single component) or barter with it, since it is meant for research and is meant to be used and discarded.<br />
It is not illegal for a company to send you a free sample, I have requested and was sent everything from IC sockets, op amps, audio amps, even three axis acceleration ICs. On every request for I stated I was a hobbyist and wanted the samples for personal use. Of the 30 odd samples I've requested, only 2 were not granted, one for LCD switches, the rep said they were too expensive at the time for non-comercial requests. The other was denied because I did not have a .com email address. If you are honest and polite you should have no problems getting free samples. Hobbyist have created many inovative uses for products the manufactures never thought of, opening new markets for existing products. A Win-Win for both companies and Hobbyists.<br />
Could you tell me where are some class AB amplifier ICs available for sampling. I know NS, STmicroelectronics and Texas Instruments, but these ones doesn't suits for me. I would like to make some 50W+ amp<br />
good instructable, but u got one of them cheapo knock off itouches
For $40 its not a bad deal! Radio, voice recorder, touchscreen, camera with pics and video, text viewer, etc etc. I am not really the person to spend over $150 on an ipod touch when a $40 thing works pretty well.
where can i get one of those! it sounds a lot better than a palm zire 31 for a mp3 player
good point! see ya

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