High Quality Low Wattage Amplifier

bimo · 03:48 PM

I am looking a low wattage amplifier 2 to 6 watt on 8 Ohm, with minimum quality is same as LM1875. It can an IC or discrete (transistor) but with simple design.

johnr66 · 9th March 2013, 01:51 PM

To get 2 clean watts (non clipping) from an 8 ohm load, you need no less than 14 or 15 volt supply. If you need 4 to 5 watts, look at ICs rated for around 20 volts (typical use, not max supply voltage). So why not just use an LM1875 or TDA2050? These chips will run just fine at the lowered voltage.

If lower supply voltage is needed, you need a bridge amp.

bimo · 11th March 2013, 06:03 AM

Thank you John, but is driving LM1875 at lower voltage an optimal design? Is there any IC with quality of LM1875 but at lower wattage and lower price?

Jay · 11th March 2013, 07:43 AM

Check out LA4270. My LA4270 is buffered with 2N2222 and it has a rare quality. At 1W or 2W it sounds better than my 1875 or others.

johnr66 · 11th March 2013, 03:37 PM

Quote:

Originally Posted by bimo

Thank you John, but is driving LM1875 at lower voltage an optimal design? Is there any IC with quality of LM1875 but at lower wattage and lower price?

It is has global negative feed back just like virtually all other power amp ICs. It will sound fine under lower voltage. Output swing is not optimized as much as some lower voltage chips, but it gets you in the power range you wanted.

The beauty of it is, you can adjust the supply voltage to what you need. Say you want more power down the road, you can upgrade to a stronger power supply. Just use components to handle the higher voltage and larger heatsink.

For example, this small monoblock that is based on the TDA2050 will operate on 5 volts to 30 volts and from 30 to 45 volts with a fan. It can produce 27 non clipping watts with a 38 volt supply (4 ohms) or about 7 watts into 8 ohms using a 24 volt power brick from an old HP inkjet printer.

ChristianThomas · 11th March 2013, 07:39 PM

@JohnR66

That's very sweet. I love the idea that it's a "monoblock".

bimo · 14th March 2013, 01:51 PM

Quote:

Originally Posted by Jay

Check out LA4270. My LA4270 is buffered with 2N2222 and it has a rare quality. At 1W or 2W it sounds better than my 1875 or others.

Jay, can you share your schematic/circuit?

picbuck · 01:47 PM

Whoa! That is one neat li'l block o' power!

Price note: the TDA2050 is $2.25 at Jameco. You're not going to get a power chip for much less.

9th March 2013, 12:28 AM	#1
bimo diyAudio Member Join Date: Sep 2010	High Quality Low Wattage Amplifier I am looking a low wattage amplifier 2 to 6 watt on 8 Ohm, with minimum quality is same as LM1875. It can an IC or discrete (transistor) but with simple design. Last edited by bimo; 22nd April 2013 at 03:48 PM. Reason: typo

16th March 2013, 01:36 PM	#8
picbuck diyAudio Member Join Date: May 2008	Whoa! That is one neat li'l block o' power! Price note: the TDA2050 is $2.25 at Jameco. You're not going to get a power chip for much less. Last edited by picbuck; 16th March 2013 at 01:47 PM. Reason: update

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9th March 2013, 01:51 PM	#2
johnr66 diyAudio Member Join Date: Mar 2009	To get 2 clean watts (non clipping) from an 8 ohm load, you need no less than 14 or 15 volt supply. If you need 4 to 5 watts, look at ICs rated for around 20 volts (typical use, not max supply voltage). So why not just use an LM1875 or TDA2050? These chips will run just fine at the lowered voltage. If lower supply voltage is needed, you need a bridge amp.

11th March 2013, 06:03 AM	#3
bimo diyAudio Member Join Date: Sep 2010	Thank you John, but is driving LM1875 at lower voltage an optimal design? Is there any IC with quality of LM1875 but at lower wattage and lower price?

11th March 2013, 07:43 AM	#4
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	Check out LA4270. My LA4270 is buffered with 2N2222 and it has a rare quality. At 1W or 2W it sounds better than my 1875 or others.

11th March 2013, 07:39 PM	#6
ChristianThomas diyAudio Member Join Date: Feb 2006 Location: On a hill, in a wooden shack, next to the woods, in Somerset.	@JohnR66 That's very sweet. I love the idea that it's a "monoblock".