how to make cheap amp

sarahlove · 14th May 2006, 09:38 AM

how can i make the possibly cheapest and simpliest amplifier im am only 13 years old and dont have a lot of money

cpemma · 14th May 2006, 02:36 PM

Start with a kit version like this one but you'll find the power supply will cost more than the amplifiers. Or this TDA2005 stereo kit will run from a cheaper 12V power block adaptor.

bob123 · 14th May 2006, 03:25 PM

how much do you know about electronics??

bob123 · 14th May 2006, 03:48 PM

This would be your best bet. Components probaly cost about £5 but you would need something to build it on. I would recomend getting a breadboard and some singe core wire (£5).

The power supply would be the most costly part but using 12vdc adaptors that you can get quite cheap would be ok.

The sound quality from this simple amplfier is suprisingly good.

I think with a bit of scrounging it would be posible to build this for about £20 or maybe a bit less. It depends mainly on the power supply.

If you want to make this amplfier more powerfull you could get opamps that have max supply voltage of 22v and you could also bridge the amp into 4 ohms.

Doing this would make it run at about 200w for about 1 second (untill you get fireworks) provided that the power supply is sufficient.
P = (2 x 20 x 2/\-0.5)² / 4

If you dont understand the circuit diagram i suggest you read up on the internet:
OP-amps - Non inverting and inverting (negative feedback)
Transistors
Ohms Law

Good Luck!

sarahlove · 15th May 2006, 08:47 AM

no iment like building from components buying them not kits because i cant buy kits here there very rare

bob123 · 15th May 2006, 10:52 AM

did you read my post?

-_nando-_ · 15th May 2006, 09:14 PM

Heheheh !

TRY TDA2822

Tooooo simple, and you can power it from four (in the truth, from two to eight) Alcaline (or not eheheh) AA bateries !

And it is STEREO !

You can also try TA8238, plays well, and can be powered from a very cheap 12v supply!

You can find datasheets at www.datasheetcatalog.com
Datasheets contain all the information that you need ! Including the schematics, and some, the PCBs layout. If you don't find the PCB layout, use your creativity (it don't cost anything) and draw your own !

Oh, NO PCB!? Okay, turn on the PIG MODE and build it P2P HUAhuauAH!

If you do it with a lot of care (and NOT running agaist the time), it will work, and the only cost that you will have will be the parts !

Bazukaz · 15th May 2006, 10:54 PM

Hi,
I think the best for a beginner would be something like TDA2030 , TDA2050 , or better LM1875.They are easy to build , cheap , and have protection.
You will need dual power supply for these.
Powering from batteries is not the cheapest solution , because batteries need often replacement

.

Regards,
Lukas.

sarahlove · 16th May 2006, 09:51 AM

thanks nando ill try it i found a place that sells pcbs 150 php per square inch thas that sound right and eches them for free

sagarverma · 16th May 2006, 05:06 PM

lm386
low power,1w ,less than $1, ..cheap,powered up by pencil cell.
construct on veroboard.time:<1 hour.

14th May 2006, 09:38 AM	#1
sarahlove diyAudio Member Join Date: May 2006	how to make cheap amp how can i make the possibly cheapest and simpliest amplifier im am only 13 years old and dont have a lot of money

16th May 2006, 05:06 PM	#10
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	lm386 low power,1w ,less than $1, ..cheap,powered up by pencil cell. construct on veroboard.time:<1 hour. __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

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14th May 2006, 02:36 PM	#2
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	Start with a kit version like this one but you'll find the power supply will cost more than the amplifiers. Or this TDA2005 stereo kit will run from a cheaper 12V power block adaptor.

14th May 2006, 03:25 PM	#3
bob123 diyAudio Member Join Date: Jun 2004 Location: Southampton UK	how much do you know about electronics??

15th May 2006, 08:47 AM	#5
sarahlove diyAudio Member Join Date: May 2006	no iment like building from components buying them not kits because i cant buy kits here there very rare

15th May 2006, 10:52 AM	#6
bob123 diyAudio Member Join Date: Jun 2004 Location: Southampton UK	did you read my post?

15th May 2006, 09:14 PM	#7
-_nando-_ diyAudio Member Join Date: Dec 2005 Location: Sao Paulo	Heheheh ! TRY TDA2822 Tooooo simple, and you can power it from four (in the truth, from two to eight) Alcaline (or not eheheh) AA bateries ! And it is STEREO ! You can also try TA8238, plays well, and can be powered from a very cheap 12v supply! You can find datasheets at www.datasheetcatalog.com Datasheets contain all the information that you need ! Including the schematics, and some, the PCBs layout. If you don't find the PCB layout, use your creativity (it don't cost anything) and draw your own ! Oh, NO PCB!? Okay, turn on the PIG MODE and build it P2P HUAhuauAH! If you do it with a lot of care (and NOT running agaist the time), it will work, and the only cost that you will have will be the parts !

15th May 2006, 10:54 PM	#8
Bazukaz diyAudio Member Join Date: Nov 2005 Location: Vilnius	Hi, I think the best for a beginner would be something like TDA2030 , TDA2050 , or better LM1875.They are easy to build , cheap , and have protection. You will need dual power supply for these. Powering from batteries is not the cheapest solution , because batteries need often replacement . Regards, Lukas.

16th May 2006, 09:51 AM	#9
sarahlove diyAudio Member Join Date: May 2006	thanks nando ill try it i found a place that sells pcbs 150 php per square inch thas that sound right and eches them for free

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