Distortion question

I meant less than .1% (sorry)

John

Horrible.

I wouldn't use it.

--
You can't fix stupid. You can't even put a Band-Aid? on it, because it's
Teflon coated.

"John - KD5YI

** Gain is only ever " dB ".

0.1% at what level and frequency ?

If several volts and falling at lower levels, its perfectly OK for most jobs in audio.

But using budget op-amps like the NE5534 or NE5532 will get you down to around 0.002% easily.

.... Phil

Ok, thanks, Phil.

Input is 5mV, output is .5V, frequency .8dB down at 20kHz and flat to 20kHz.

Yes, I know I can use those OAs for a super amplifier. I just wanted to see if I could put a two-transistor amp together myself. And, I just didn't want it to be crap.

Thanks again, John

Mistake:

Input is 5mV, output is .5V, frequency .8dB down at 20Hz and flat to

20kHz. ^^^^

Sorry.

John

"John - KD5YI"

** Millions of phono pre-amps were made with 2 BJTs in a feedback pair with around 0.1% THD.

I use a simple, 6 transistor " discrete op-amp " stage that easily out performs the NE5532. The secret is in using beta matched NPN and PNP devices - still not possible on the same chip AFAIK.

.... Phil

BAD.

It should be an order of magnitude lower at the very least.

Okay, then. I don't feel so bad with what I have.

But, I'm going to get a few of those OAs you mentioned. They sure look good.

Thanks, Phil.

John

If you only buy onesey twoseys they are expensive. If you are going to pay a premium anyway, you should buy one of the even better than he mentions jobs out there. I mean if it is $3 each or $5 each (or even $15)for the 10X improvement, I'd get the good (better) one.

The AD8066 or the OPA636 or the OPA637

try this:

Looks like exactly what I need.

I'll do it a bit differently though. I work with conduction cooling designs all day. It will be fun to miniaturize this even further. Very nice, clean design.

About $1US in qty of one for a dual device. That's pretty inexpensive in my opinion.

Rather poor.

That is more like it!

o

with

od.

I like the OPA134 (or 2134) Didgikey has these in DIP's which is nice for prototyping.

Add a few with your NE5532 order.

George H.

TI has chips ten times better at under a buck each. That ne5532 chip is the LAST chip you should choose for this application.

The link I posted has characterizations of each. DAmn near any a person with half a brain would choose. The 5532 is way down at the bottom of the pile.

Interesting! The OPA637 is $24.21 in single quantities.

Wow, what a deal, SFB (Shit-For-Brains). God, what a dolt.