Am I right in thinking the 741 was.....

You alright there, DNA?

(1) The 741 wasn't too shabby an OpAmp (for its time).

(2) The published schematic is NOT the real schematic... ask (IIRC) Raytheon... they copied the schematic with disastrous results ;-)

...Jim Thompson

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

That narrows things down.....

So, is

slightly right in the right sort of way?

Did Bill and Ben have their heads together when Mike gave Raytheon the original design but they upset Mike and Mike met Bill who spoke to Bob and then Ethel came up with the master plan whereby Bob, Bill, Martin, Mike and other Bill edited the masks to come up with something entirely different.... but made up another diagram and then spoke to Dave and other Mike about an offer for second sourcing on a particular understanding that certain things would not happen as long as certain other things did....?

Sure fine, I just felt stupid enough to try and figure out why and then thought I'd check for hidden (conspiracy theories) reasons unrelated to my limited comprehension of 'this bit goes up, so this bit goes down'.

DNA

How DARE you insult Mr.Rube Goldberg with such a demeaning language!

-- Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com

------------------------------------------------------------------ A limerick packs laughs anatomical Into space that is quite economical. But the good ones I've seen So seldom are clean, And the clean ones so seldom are comical.

IIRC that looks correct. I used a lot of those in thick-film hybrid LDO regulators for the Hughes TOW Missile in 1970-73. I needed that exact configuration to make it work. Other _so-called_ 741's wouldn't work.

That's a common-mode feedback loop in the middle (if that Q8-Q9-Q3-Q4 circuitry is throwing off your comprehension). Q10-Q11 is your classic Widlar logarithmic current mirror.

Do I need to write another OpAmp tutorial?

...Jim Thompson

Wouldn't dream of it and I'm sure he would deny it anyway.

DNA

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

No!!! And I don't need none of your silly hints either.

For the moment it might be enough to say it is meant to be..... I'll be off to bed now but I shall move things up and down tomorrow.

DNA

...Jim Thompson

Or his design review by Mr Murphy.

I remember, in days of yore, making the decision to use 741's in a big shipboard control system program. They were more expensive than uA709's and such, burger+fries+milkshake maybe, but had three big advantages: no front-end zenering/latchup modes, no external compensation, and a decent current limit. That sort of stuff was impressive in those days. They were fine for most analog/controls stuff, had few quirks and pretty good DC specs. The PNP front-end had chronic popcorn noise, so they sucked for really low-level stuff.

What's a good gp opamp now? I like the LM7301, SOT-23, r-r i/o, OK DC specs, 4 MHz, 5v to +-15v supplies.

John

Hello John,

I liked the uA709 better. Compared to the 741 it felt like a hotrod but that also meant you could wreck out easier. Of course, the hottest of all amps from those days is the uA733 which was also remarkably cheap almost right from the start. I made a lot of RF gear with those. There were times when a 733 sold for about the same price as a 741 in the local stores (in Germany) but you got a Kawasaki instead of a moped.

Nice, but expensive.

Wasn't the µA733 an early video amplifier?

balanced out, but only +/-6V supply

What's a modern-day replacement for NE5532?

SioL

"Jim Thompson" wrote in message news: snipped-for-privacy@4ax.com...

So, it was item 3.

I'll make no claims but, after a bit of head beating, I see something. S*it, now you've told me, I can't even claim to have almost got nowhere.... Bastard. Now all the Girlies down the pub want to meet the real Jim Thompson.

DNA

Sure they do. One of the worst put-downs I ever endured was from a _very_well_put_together_ female employee who told me I was "a father image" to her :-(

...Jim Thompson

Stings, don't it? I can still remember the first time a gal on the street called me "sir". 8-(

Best regards, Spehro Pefhany

Youngster. I've been called "sir" for at least 25 years ;-)

And "N" has finally succumbed to using the "senior" discounts.

I've been using them for years. To me a discount is a discount... I don't care what you call it.

The airline senior discount can be quite substantial... I don't tell them I'm a working senior... the laptop is "just for watching movies" ;-)

...Jim Thompson

Gosh Jim, are there chip-designer groupies?

John