3w amplifier for portable stereo speaker

[Adhith]

Hello everyone...
I have a sony ericsson mps60(model name) stereo speaker,but the amplifier is damaged.So can anyone give me the circut diagram with the same specifications?? It is a 3w amplifier and i would like to connect usb for power supply & 3.5 jack for audio input.The pic of the amplifier is attached with this.

[madires]

Please try to identifiy the amplifier IC and check out its datasheet. Usually the reference circuit in the datasheet is used.

[Adhith]

The only thing i can see is the writing  7 2 220 6k  component.its a transistor right..?

[MosherIV]

The only thing i can see is the writing  7 2 220 6k  component.its a transistor right..?

Nope, they look like surface mount capacitors.

Is there anything on the underside of the circuit board?

[Zero999]

A little off-topic but 3W from a 5V supply, with no boost converter sounds a bit optimistic. The voltage drop in the power stage would have be about 100mV or less to put 3W into a 4 Ohm speaker and even then it will probably be very distorted.

Turn the board over. There should be an IC on the other side, which is the actual amplifier. Those capacitors are just for AC coupling and to bypass the power supply at audio frequencies.

[Adhith]

The back side consist of 2 small black ic like component.
Written k 994 Y728

[madires]

Maybe TS4994, which got the marking K994? But it's an 1W amp.

[Audioguru]

Maxim make the MAX98306 class-D stereo amplifier IC that is similar. With a 5V supply, it produces 3 Whats per channel into 4 ohm speakers with horrible 10% clipping distortion or 2 Watts with fairly low distortion. The Sony-Ericsson (when did Sony buy Ericsson?) speakers (squeakers?) are tiny and their cost 9 years ago was very low. 

[tooki]

I would just replace the board with one of the PAM8403 amplifier boards you can get on eBay for a dollar or so. It's a similar 3W, 5V class-D amp.

Audioguru: Sony didn't buy Ericsson. Sony Ericsson was a joint venture between Sony and Ericsson. (Sony's mobile phone designs were abandoned and Ericsson's were simply relabeled with the new brand.) Both parent companies continued. In 2012 Sony bought Ericsson's shares in the joint venture, making it a fully owned subsidiary of Sony, renamed Sony Mobile. (Ericsson continues to be a major vendor in cellular tower equipment, AFAIK.)

[Zero999]

I would just replace the board with one of the PAM8403 amplifier boards you can get on eBay for a dollar or so. It's a similar 3W, 5V class-D amp.

I agree. The PAM8403 looks like a good IC.
http://www.diodes.com/_files/datasheets/PAM8403.pdf

[Adhith]

Thank you everyone..
I saw a simple audio amplifier circiut with lm4954 & thought to give it a try, all the capacitors in figure  are electrolytic ones right??(what about ci) also i want to know that if i replace ground with neagtive terminal, should i connect the ground from the audio jack to it(what i meant was will there be any reverse flow of current to the jack through the ground of the jack).

[Zero999]

Thank you everyone..
I saw a simple audio amplifier circiut with lm4954 & thought to give it a try, all the capacitors in figure  are electrolytic ones right??(what about ci) also i want to know that if i replace ground with neagtive terminal, should i connect the ground from the audio jack to it(what i meant was will there be any reverse flow of current to the jack through the ground of the jack).

Yes, that will work but it's class AB rather than class D so will use more power.

If you can find it on a pre-assembled board, then go for it, otherwise it comes in a microbump package which can only be soldered using a reflow oven, forget hand soldering.

[rob77]

+1 for the PAM8403 board from ebay i bought them the other day (10 of them for approx 5$) and the performance is surprising, after connecting speakers and powering the thingy it was silent, no hissing sound from the speakers - i was pretty much surprised surprised. and the sound quality is pretty good/acceptable for such a cheap solution

[ebclr]

Let's try this 0.30 usdsolution



http://pt.aliexpress.com/item/1pcs-lot-PAM8403-Super-mini-digital-amplifier-board-2-3W-Class-D-digital-amplifier-board-efficient/32477442965.html?spm=2114.30010508.3.2.0tOv50&ws_ab_test=searchweb201556_0,searchweb201602_3_10057_10056_10065_10037_10055_10054_10069_301_10059_10033_10058_10032_10017_10070_10060_10061_10052_10062_10053_10050_10051,searchweb201603_2&btsid=a24ada90-efbf-431a-844b-c75b51fa24f3

[Adhith]

thank you everyone...
 i have made the amp with TDA7052 & its working, but the ic  gets heated after 5 minutes of operation also the sound clarity is disappointing. The actual circuit have a 4.7k potentiometer, but i have replaced it with a 4.7k resistor does this makes any difference in clarity?? does making another amp with TDA 1015 make any difference??

[Audioguru]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.   

[Adhith]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.

so what should i do to get a good clarity audio output?? what type of ics are commonly used in speakers??

[Zero999]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.

so what should i do to get a good clarity audio output?? what type of ics are commonly used in speakers??

Plenty of people have recommended the PAM8403 which you can get pre-assembled on a board. Can you not get hold of it where you live?

[Shredhead]

Here are some chipamps that I've made and tested.  All of the below power numbers are sustained sines at 1kHz, and I list peak power numbers.  If you are used to seeing average power numbers, simply divide the number by 2. 

LM386N-1   http://www.mouser.com/ProductDetail/Texas-Instruments/LM386N-1-NOPB/?qs=QbsRYf82W3GLguMHc1jDPg%3D%3D

9.24V supply
4 ohms – 1.06W
8 ohms – 1.3W

14.85V supply
4 ohms – 1.1W
8 ohms – 2.12W

LM386N-4   http://www.mouser.com/ProductDetail/Texas-Instruments/LM386N-4-NOPB/?qs=QbsRYf82W3FsJPldcpZj5g%3D%3D

14.98V supply
4 ohms - 1.41W
8 ohms – 2.52W

21.78V supply – 13.7mA idle current
4 ohms – 1.58W
8 ohms – 3.04W

TPA1517  http://www.mouser.com/ProductDetail/Texas-Instruments/TPA1517NE/?qs=sGAEpiMZZMtxdzBvM0rKcec3clR2XnYWHJGwvAdjFhI%3d
-You need a heat sink with this chip.  They make ones for it or you can tie some copper or aluminum to the top of the chip with some heat grease.

12V Supply
4 ohms – 5.4W
8 ohms – 3.8W

LM4752  http://www.mouser.com/ProductDetail/Texas-Instruments/LM4752TS-NOPB/?qs=%2fha2pyFadujGkk%2f7%252blJjSLISy9c1AEvWoJnbngNJ47Q%3d
-This is an SMD part.  I attached wires to the leads that went to a through hole PCB.  I paper clipped a piece of aluminum to the chip for a heat sink.  Pretty impressive power for a tiny chip. 

24.5V Supply
4 ohms – 19.5W
8 ohms – 13.38W

If the chip you are using now sounds bad because it is overheating, see if you can get some metal on it with some thermal compound.  It might be enough to do the trick and keep what you're using.  I'm just listing the above stuff for anyone who might be interested. 

[tooki]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.

so what should i do to get a good clarity audio output?? what type of ics are commonly used in speakers??

What's the point of asking for advice if you're just gonna ignore it? You asked, you got the same answer from several people, so it's probably good advice.

[Adhith]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.

so what should i do to get a good clarity audio output?? what type of ics are commonly used in speakers??

What's the point of asking for advice if you're just gonna ignore it? You asked, you got the same answer from several people, so it's probably good advice.

I haven't thought of ignoring anyone sir..&  I apologize for my ignorance if everyone thinks in  that way. i know that using the PAM8403 board  is a good solution, but i thought to built the amp by myself with any alternate circuit rather than purchasing the pre assembled kit.

[Zero999]

If you're after some soldering practise then the PAM8403 is available as a bare IC from various distributors:
http://www.mouser.co.uk/Search/Refine.aspx?Keyword=PAM8403
http://uk.rs-online.com/web/p/audio-amplifier-ics/7902975/

[tooki]

The TDA7052 is in an old 8 pins dual inline package. With a 6V supply its output into an 8 ohm speaker is 1.2 Whats with 10% clipping distortion or about 1 Watt with fairly low distortion. Its heating is almost the same as its output power so of course it will get hot but not too hot.

The TDA7052A is also in an 8 pins dual inline package and produces 1.1 Whats or about 0.9 Watts into 8 ohms with a 6V supply. It gets hot like the TDA7052.

The TDA7052AT is in a tiny package and gets too hot when driving an 8 ohm speaker so its speaker must be 16 ohms when it produces 0.55 Whats or 0.45 Watts with a 6V supply and it gets hot.

The very old TDA1015 produces only 0.3 Whats into 8 ohms with a 6V supply or about 0.25 Watts.

so what should i do to get a good clarity audio output?? what type of ics are commonly used in speakers??

What's the point of asking for advice if you're just gonna ignore it? You asked, you got the same answer from several people, so it's probably good advice.

I haven't thought of ignoring anyone sir..&  I apologize for my ignorance if everyone thinks in  that way. i know that using the PAM8403 board  is a good solution, but i thought to built the amp by myself with any alternate circuit rather than purchasing the pre assembled kit.

I understand the desire to build, but any DIY solution is going to cost 10x as much and will not perform better. (Options are limited when a 5V supply is specified for several watts output.) If you want to tinker, get a PAM8403 or PAM8406 board, study the datasheet, and then figure out what traces to cut and where to add things to implement soft power (i.e. no pop on powerup), mute, etc. (Some boards break out those pins, but most are hard wired without such niceties.) And add a decent capacitor on the power rail, because standard USB chargers' 1A is plenty of power for listening, but may not be enough to feed the PAM chip during peaks at high volume -- the voltage may sag and cause it to cut out.

[Audioguru]

I do not know why the LM386 amp IC was mentioned and its "1.3W peak" power when its supply is a little more than 9V. Its datasheet shows that its maximum very distorted output into 8 ohms with a 9V supply is only 6V peak-to-peak which is 3V peak. Then its peak output power is (3V squared)/8 ohms= 1.125W. Its real output power is only 0.35W just before clipping then its distortion is low.

[Shredhead]

I do not know why the LM386 amp IC was mentioned and its "1.3W peak" power when its supply is a little more than 9V. Its datasheet shows that its maximum very distorted output into 8 ohms with a 9V supply is only 6V peak-to-peak which is 3V peak. Then its peak output power is (3V squared)/8 ohms= 1.125W. Its real output power is only 0.35W just before clipping then its distortion is low.

I measured 3.22V peak into the 8 ohm load for the 1.3W peak power number.  I assure you, my testing methodology is thorough and repeatable.  The waveform was not clipped which is usually indicative of 1% or less THD.  I was surprised to see higher output from this chip than the datasheet lists too but the LM-386N-4 was the same story.