Improving the Non-Inverting chipamp

[analog_sa]

what are you using for resistance wire

As i already mentioned in this thread i use wire wrap kynar insulated wire or just magnet wire. Nichrome seems way too non-linear to expect anything nice and soldering it is pretty much impossible. That's the stuff that 'white coffin' resistors use and they all sound atrocious to my ears.

I first started winding sub one ohm resistors at the time i was into discrete SS amps and noticed that the addition of emitter resistors always brought the sound down. With home made resistors the difference was barely perceptible.

[analog_sa]

washing machines are designed to last just two years.

Apparently mine has a design fault Or it's just too old.

What's wrong with that anyway? If i was a manufacturer i'd make sure all products self destructed a day after the warranty expired.

[Nuuk]

What's wrong with that anyway? If i was a manufacturer i'd make sure all products self destructed a day after the warranty expired.

I sincerely hope that you are joking!

[analog_sa]

Relax Nuke. I'm either joking or not a manufacturer Still, i guess, many are tempted.

[Nuuk]

Relax Nuke. I'm either joking or not a manufacturer Still, i guess, many are tempted.

I'm relaxed now thanks! And recycling some more electronic parts!

[carlosfm]

Originally posted by jackinnj
the reason that "toasters" in the U.S. in the 1950's lasted so long...

Everything lasted longer and there were people to repair and parts available for replacing.
In 1989~1990 I repaired computer motherboards and monitors.
Now you don't repair. You trash it.

Talking about lasting longer, look at modern cars.
Older cars with decades old had the original carb in shape.
On new cars it is very common to have problems with the electronic injection/ignition in a question on 2~3 years.
Specially when warranty expires.
And they don't repair it.
They just replace the "black box" and ask you a huge amount of money.

[jeff mai]

Originally posted by carlosfm
using very low value resistors

I built up a quickie amp today using LM3875 with 2Kohm and 100 ohm feedback resistors as previously shown:

[carlosfm]

Originally posted by jeff mai
I built up a quickie amp today using LM3875 with 2Kohm and 100 ohm feedback resistors as previously shown:

How much dc-offset?

[jeff mai]

Originally posted by carlosfm
How much dc-offset?

About 4mV on both channels. This is less than the other chip amps I've built by quite a bit. I think all the others were 10 - 30mV

[carlosfm]

Originally posted by jeff mai
About 4mV on both channels. This is less than the other chip amps I've built by quite a bit. I think all the others were 10 - 30mV

Great.
And what value did you use from NI to ground?
R1 on my schematic (15k).