The First Watt is The Sweetest!

[Drbulj]

For me it was one of best songs when I was kid, still is

 

[stigigemla]

1w current dumping in 8 ohm. It should be better than 0,01% dist but the OPA:s with rail to rail is not so good as one could expect with a lot of output current.
With LM 4562 dist is lower. But output power too. R6 can be adjusted to get better balance in the current mode bridge.
View attachment 1470050

 

[daqvin_carter]

Antone happen to have distortion figures for LM1875 and LM3875 with a 16 ohm load? Considering a low power amp where I need 10 watts at most and would like to leave it on long term.
Thanks

 

[WhiteDragon]

maybe I should try a battery 12v powered amp.

Sounds like a idea.
What I wanted to try too. 2x 12 volts for dual supply.
Should be nice clean power. About 4 to 5 watts into 8 ohms

 

[wahab]

Rat nest build back on 2009, NE5532 + 2x MP1620/MN2488 Sanken darlingtons, supplied by 20V and up to 36V,
installed in a recycled Pioneer GM20 car amp case.
Believe it or not it s still perfectly functional 16 years later while being about 24/7 on , the other day i passed it through
the hot water fawcet to clean the accumulated dust, after wich once dried it got back to its PC amp duty.

 

[Horneydude]

What I wanted to try too. 2x 12 volts for dual supply.
Should be nice clean power.

It reminds me of a very curious battery low powered amp, the Altmann BYOB. BYOB for Bring Your Own Battery. What was special, was that the board was bare mounted on a spruce piece of wood with a special lacquer treatment. I just checked Altmann his website "mother-of-tone" but it is offline unfortunately. It was highly regarded by big audio magazines. Maybe the man has passed away by now.

 

[lineup]

Antone happen to have distortion figures for LM1875 and LM3875 with a 16 ohm load? Considering a low power amp where I need 10 watts at most and would like to leave it on long term.
Thanks

Both LM1875 and LM3875 have low distortion.
Should be even lower with 16 Ohm.
1 Watt into 16 Ohm gives typically THD 0.00006% in my simulation.
For 10 Watt in 16 Ohm you need +/-20 Volt supply.
Search for LM1875 in titles in Chip Amps forum. There are plenty of threads with LM1875 information.
LM1875 is easy to find and buy and you need a transformer 2x15VAC.

Here is the circuit I recommend:

 

[Drbulj]

and you need a transformer 2x15VAC.

Even much better, 2 LiIon 18V batteries for power tools