Maker Pro
Maker Pro

Low power stereo amplifier

Hi,

I need to amplify the Rear Line-Out from my USB Audigy 2 NX for output
to a pair of 4 ohm stereo multimedia speakers. However, rather than
paying upwards of $75 AUD for a prebuilt or kit amplifier, I've
decided to construct a low power amplifier myself using spare parts.
After searching the net, I've found three designs that look promising

http://www.sound.westhost.com/project10.htm
http://www.sound.westhost.com/project19.htm
http://www.sound.westhost.com/project72.htm

If anyone has any suggestions about these or recommendations of other
designs, their input would be greatly appreciated.
Thanks in advance.

--James
 
W

Winfield Hill

[email protected] wrote...
I need to amplify the Rear Line-Out from my USB Audigy 2 NX for output
to a pair of 4 ohm stereo multimedia speakers. However, rather than
paying upwards of $75 AUD for a prebuilt or kit amplifier, I've
decided to construct a low power amplifier myself using spare parts.
After searching the net, I've found three designs that look promising

http://www.sound.westhost.com/project10.htm
http://www.sound.westhost.com/project19.htm
http://www.sound.westhost.com/project72.htm

The first one is a class-A amplifier that'll require massive heat
sinks and cooling, and a larger power supply. The other two use
power ICs and will be easier for you to construct.
 
J

Joerg

Hi James,

Class D amps are much lower in dissipation if you need it in a small
space. TI makes the chips, plus some other major mfgs.

Other Idea: Why not take the amp from an old stereo? Either from a
stereo that you need to junk because the players fell apart or from a
garage sale. That's what I did. The amp is even black, matching the
computer. Cost would be next to nothing, nice clean enclosure, no
soldering.

Regards, Joerg
 
N

Nicholas O. Lindan

I need to amplify the Rear Line-Out from my USB Audigy 2 NX for output
to a pair of 4 ohm stereo multimedia speakers. However, rather than
paying upwards of $75 AUD for a prebuilt or kit amplifier [I want
to build one from scratch]...

Why not go to a second-hand junk store/ask around/ebay, and pick up
an old stereo receiver/amp in the $5-$10 range?
 
L

Lisandro Pin

The class-A amp in Rod Elliot's site is a very similar design to the
(relatively) famous John Linsey Hood design from 1996 - it's a TERRIFIC
amp, but it's construction is not trivial, as it requieres massive
heatsinking and a very low noise power supply.

As for the IC-based amplifiers, those are quite good, specially
considering the price and ease of implementation. I would definitely
reccomend those - i think you'll be pretty happy with the final result.
 
R

Rich Grise

On Thu, 09 Dec 2004 17:28:26 -0800, Lisandro Pin wrote:

.... it's a TERRIFIC
amp, but it's construction ...

So, make up your mind! Is it a terriffic amp, or is it construction?
;-)

Thanks,
Rich Grise, self-appointed Chief,
Apostrophe Police
 
K

Ken Finney

Hi,

I need to amplify the Rear Line-Out from my USB Audigy 2 NX for output
to a pair of 4 ohm stereo multimedia speakers. However, rather than
paying upwards of $75 AUD for a prebuilt or kit amplifier, I've
decided to construct a low power amplifier myself using spare parts.
After searching the net, I've found three designs that look promising

http://www.sound.westhost.com/project10.htm
http://www.sound.westhost.com/project19.htm
http://www.sound.westhost.com/project72.htm

If anyone has any suggestions about these or recommendations of other
designs, their input would be greatly appreciated.
Thanks in advance.

I posed a similar question here several weeks ago, and was pointed
towards the National LM4752 part, which I'm planning on using to
build my own.


http://cache.national.com/ds/LM/LM4752.pdf
 
Top