ghetto blaster

[lejaybo]

howdy peoples

i wanna make a simple ghetto blaster style portable system

doesn't have to sound the greatest but i'm looking for a simple amplifer that'll run of batteries

plus has anyone played with dab tuners?][;p

 

[teherrorofdoom]

im currentley working on a 2x 20 watt amp using the tda 2003 its quite cheap to make and decent sound quality i dont know what its like with regular batterys but it runs for a good time on my drill battery

anyway heres the circuit diagram for it

 

[star882]

There are plenty of hybrid digital chips designed for battery operation. Of course, pretty much all of them are SMD. But some of them are still easy to work with.

 

[lejaybo]

sweet i'll have a butchers

i found some old low power 8inch cheap drivers

i wonder if thats a bit too much for a ghetto blaster lol

 

[Stuey]

Too much? Check this...!

http://www.diyaudio.com/forums/showthread.php?s=&threadid=104402&highlight=

 

[benchtester]

howdy peoples

i wanna make a simple ghetto blaster style portable system

doesn't have to sound the greatest but i'm looking for a simple amplifer that'll run of batteries

plus has anyone played with dab tuners?][;p

Parts Express has a sale on a T-amp (today only?). Sounds pretty decent and is pretty efficient.

 

[AndrewT]

for battery operation use high efficiency speakers.
8ohm >=96dB/W/m or 4ohm >=96dB/W/m>=99dB/2.83V/m

 

[Rainwulf]

TEA2025 is a nice simple chip that will run BTL, runs of 6-12 volts, and will put 4.7 watts into an 8ohm speaker in BTL.
Idea chip for battery operated devices.

 

[johnr66]

What battery type do you plan to use? What voltage?

I just got some TDA7267 ICs. After doing careful tests with my oscilloscope and function generator, I found it to deliver 1.8 watts (non clipping) into a 5 Ohm load with a 9 volt Vs. This is very good performance for a single ended output IC. It requires very few components.

 

[lejaybo]

cool info guys

i'm thinking roughly to use 9 to 12 volts
AA tyes me thinks, something thats easily avaiable

the best power i can get for this power is my aim

plus i know it'll sound a bit better than those plastic crapola boombox i keep seeing


anyone seen quad channel IC ?

 

[pjp]

With AA cells you'll never get enough volume for outdoor use.
You want something that can deliver greater current.

If you are up to the complexity of the charger design, I suggest using Lithium Ion cells. (The type used to re-cell laptop batteries.)
Or the Li Polymer cells used by model aircraft builders. (Costs more.)

Additionally, if you care about battery life, a class D design will make a very big difference.

 

[Rainwulf]

A really good chip quad IC for battery power (12 volts ideally) is the TDA7375.
4 seperate channels, and each channel can be bridged for 2 channels with a lot more power.
You can create your 12 volts with a gell cell.


can put 35 watts into two speakers.

Have a read of this.
http://pdf1.alldatasheet.com/datasheet-pdf/view/25150/STMICROELECTRONICS/TDA7375.html

 

[johnr66]

With AA batteries, even the the single ended amps will run them down quite a bit after just an hour or two of listening with 4 ohm loads at high volumes.

While bridge amps can make 4x the power of single ended, they will run even D cells down quickly.

I recommend a single ended amp with efficient speakers. I used guitar speaker once and the setup was screaming loud, even at 1 watt. Sound may not be hifi, but it was better than most off the shelf boom boxes.

 

[lejaybo]

cool

i saw some li polymers. my matres got some for his plane

never thought to used batteries like that

might use two in parallel for some tasty current 🙂


i'm thinking of using a coxial and a std driver hence the 4 channels

more investigation required!!!

 

[star882]

Look for some older but usable laptop batteries. If you can figure out the pinout, the voltage is just right for some TI hybrid chipsets.

 

[lejaybo]

cool i got a few old laptops knocking about

to the bat cave!!!!!!!!!