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Driving a speaker (or headphones) with ARM (LPC2138)

Thread starter #1
Hello

I am freshly new here, so I hope this is the correct place to post this question. If not, I apologize.

I would like to connect a sound playing device (speaker, headphones), which ever is easier, to my ARM's ( LPC2138 ) DAC converter. My question is, what should the circuitry - that is connected to the ARM's DAC pin - for the speaker be. I am not interested in the quality of the sound, all I need is a rough sound, to see that it works.

I found this circuitry but I don't know if it is at all correct or, what the modifications should be, or if there is perhaps an easier way, since I don't have that specific amp.
http://www.electro-tech-online.com/attachments/amplifier-with-minimum-parts-png.23965/

The speaker that I have is 5W, 4ohm. The headphones are just your standard MP3 little ones. I would prefer to connect it to the speaker though.

Thanks for your time and any help.
 
#2
Hello

I am freshly new here, so I hope this is the correct place to post this question. If not, I apologize.

I would like to connect a sound playing device (speaker, headphones), which ever is easier, to my ARM's ( LPC2138 ) DAC converter. My question is, what should the circuitry - that is connected to the ARM's DAC pin - for the speaker be. I am not interested in the quality of the sound, all I need is a rough sound, to see that it works.

I found this circuitry but I don't know if it is at all correct or, what the modifications should be, or if there is perhaps an easier way, since I don't have that specific amp.
http://www.electro-tech-online.com/attachments/amplifier-with-minimum-parts-png.23965/[size=-10]پروژه هاي الکترونيک کنترل مانيتورينگ اتوماسيون صنعتي ارایه انواع پروژه هاي صنعتي آزمايشگاهي دانشگاهي تحقيقاتي automasys.wordpress.com انواع ميکروکنترلرهاي ميکروچيپ اتمل اينتل فيليپس AVR ARM LPC STM32 PIC dsPIC 8051 8086 z80 انواع اينترفيس و پروتکل هاARM AVR PIC MicroController Electronic Project GPRS GSM USB BlueTooth Ethernet Network CAN I2C SPI RS485 Automation PLC پروژه الکترونيک ميکروکنترلر آرم 8051 اتمل فيليپس ميکروچيپ Interface اينترفيس ويژوال استاديو Visual Studio 2010 C# VB.Net Protel DXP Altium Eagle PCB SPICE PSPICE HSPICE ADS OrCAD Silvaco[/size]
The speaker that I have is 5W, 4ohm. The headphones are just your standard MP3 little ones. I would prefer to connect it to the speaker though.

Thanks for your time and any help.
Hi there,

You can also use LM385 but I suggest TDA7052 which is very common and cheap.
Also it needs minimum external parts, usually just a coupling cap!
 
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