THE "Universal" OP Amp

Well, find an opamp that you like and will do everything except the drive. Then add the equivalent to the LH0002 (damn! been obsoleted) as a current buffer, giving a composite opamp with good drive capability. If you choose properly, the opamp can go to +/-18V supply (or 0/36V).

Your "Universal" is false. It is a solution to your requirements, nothing "Universal" about it. So sit again on the specs of this circuit and watch out on conflictic definitions e.g. 12 volt/20ohm load/ low power package.

----> 144/20 = ~7W so where is the low power?

HTH

Stanislaw

"Trevor Moron"

Can't even get the simplest LM386 circuit to work.

....... Phil

Doesn't sound too universal to me..... Sounds like an amplifier that that needs desired criteria of......

.................

Apart from those who want a 'Universal Op-Amp' that does something different.

That's OK....... (If you want to come across as a pretentious cunt) Eeeyore will be along soon to not give you the design you thought you wanted in the first place........

After someone else has told him how to do it and then he won't anyway.

I think that's how it works.

Bonza!

DNA

"Trevor Moron"

--------------------------------------------------

"Trevor Morton"

With a 4 volt supply, square wave drive and 33 ohm load ( no coupling cap), the output is a clean. 2.6 volt p-p square wave at *any* frequency up to

With a 12 volt supply, same set up as above, the output swing is 10 volt p-p.

Same p-p swings apply to a sine wave input as well. BTW

Make sure your input signal does not have a DC offset.

....... Phil

---------

----------------------------------------

Meeeeoooowww

........ Phil

Really, i just received 50 LH0002 to replace a few bad one's in some old FENNER/CONTRX units. i think we paid around 2 bucks each.

I think you can combine the closed loop bandwidth with the maximum gain and say that the opamp must have an open loop gain bandwidth product of at least 20*20k=400kHz. A little extra might not hurt. Lots of opamps have about a 5. to

(snip)

How about 2 in an 8 pin DIP? Take a look at the LMC6482

Add a complementary emitter follower made of high gain transistors like ZTX698B and ZTX788A

And get a peak output current greater than 1 amp something like within a volt or so from each rail (more if you allow 2 volts from rails).

You will have cross over distortion, but you didn't spec that.

For applications that don't need the high output current, eliminate the followers.

On Mar 24, 3:39?pm, Trevor Morton wrote: I am seeking to devise a single [op amp] design suited to a wide range of applications...

You ever notice that when all you see are hammers, everything looks like a nail?

-mpm

That doesn't mean that they are not obsolete. I still have some NOS RTL and DTL ICs, but that doesn't mean that you could buy production quantities. Even Jameco is clearing out their remaining LH0002CN ICs.

To me it demonstrates only your disability to understand how an opamp functions.

single supply GBW

every opamp

unity gain stable, but I want infinite gain ridiculous- trimpot

somewhat outdated these days. Only for hobbyists

I rather would like to be able to drive complex loads too.

Rail to Rail output

You left out some very important data like PSRR, CMRR, common mode voltage range, input impedance, offset voltage, Bias current, noise, distortion, linearity, overload recovery etc.

The industry doesn't produce parts for beginners like you only. Better you start understanding at least the most fundamental ideas behind opamps. Even a 741 is far more versatile than your data. You seem to have only audio and LED drivers in mind.

I would say GIGO, my answer included. :-(

Moron would be appropriate. There is s.e.b. for posts like this, where stupid questions do not exist.

...maybe class D is in order?

DigiKey thinks it is obsolete.

Not nearly as pronounced as your *inability* to write in English-approaching a *disability* for sure.

what about your Italian?

So don't take it too serious Fred.

I no speaka Italian...but then this is not an Italian newsgroup.

On Sun, 25 Mar 2007 06:39:51 +1000, Trevor Morton wrote:

--- Version 4 SHEET 1 880 680 WIRE -16 -32 -336 -32 WIRE 240 -32 -16 -32 WIRE -448 0 -480 0 WIRE -272 0 -368 0 WIRE -336 32 -336 -32 WIRE -608 48 -640 48 WIRE -480 48 -480 0 WIRE -480 48 -528 48 WIRE -368 48 -480 48 WIRE -272 64 -272 0 WIRE -272 64 -304 64 WIRE -208 64 -272 64 WIRE -80 64 -128 64 WIRE 64 64 -80 64 WIRE 272 64 144 64 WIRE -368 80 -480 80 WIRE -240 160 -432 160 WIRE -16 160 -16 -32 WIRE -16 160 -240 160 WIRE 240 160 240 -32 WIRE -432 192 -432 160 WIRE -16 208 -16 160 WIRE -80 224 -80 64 WIRE -48 224 -80 224 WIRE 64 240 16 240 WIRE 192 240 144 240 WIRE -240 256 -240 160 WIRE -192 256 -240 256 WIRE -80 256 -112 256 WIRE -48 256 -80 256 WIRE 240 272 240 256 WIRE 272 272 272 64 WIRE 272 272 240 272 WIRE -480 304 -480 80 WIRE -432 304 -432 272 WIRE -432 304 -480 304 WIRE -640 320 -640 48 WIRE -432 320 -432 304 WIRE -240 320 -240 256 WIRE -80 320 -80 256 WIRE 240 320 240 272 WIRE -640 448 -640 400 WIRE -432 448 -432 400 WIRE -432 448 -640 448 WIRE -336 448 -336 96 WIRE -336 448 -432 448 WIRE -240 448 -240 400 WIRE -240 448 -336 448 WIRE -80 448 -80 400 WIRE -80 448 -240 448 WIRE -16 448 -16 272 WIRE -16 448 -80 448 WIRE 240 448 240 400 WIRE 240 448 -16 448 WIRE -640 512 -640 448 FLAG -640 512 0 SYMBOL res -96 304 R0 WINDOW 0 -40 46 Left 0 WINDOW 3 -47 77 Left 0 SYMATTR InstName R3 SYMATTR Value 10K SYMBOL res -96 240 R90 WINDOW 0 -33 58 VBottom 0 WINDOW 3 -33 59 VTop 0 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL voltage -240 304 R0 WINDOW 0 -50 100 Left 0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V1 SYMATTR Value 12 SYMBOL voltage -640 304 R0 WINDOW 0 -50 100 Left 0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V2 SYMATTR Value SINE(0 .4 10) SYMBOL res -112 48 R90 WINDOW 0 -36 49 VBottom 0 WINDOW 3 -35 52 VTop 0 SYMATTR InstName R5 SYMATTR Value 1K SYMBOL res 160 224 R90 WINDOW 0 -27 57 VBottom 0 WINDOW 3 -26 56 VTop 0 SYMATTR InstName R6 SYMATTR Value 1K SYMBOL res 160 48 R90 WINDOW 0 -39 56 VBottom 0 WINDOW 3 -34 57 VTop 0 SYMATTR InstName R1 SYMATTR Value 10K SYMBOL res -352 -16 R90 WINDOW 0 -36 54 VBottom 0 WINDOW 3 -29 58 VTop 0 SYMATTR InstName R7 SYMATTR Value 10k SYMBOL res -512 32 R90 WINDOW 0 -37 54 VBottom 0 WINDOW 3 -34 56 VTop 0 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL res -416 288 R180 WINDOW 0 -59 74 Left 0 WINDOW 3 -51 44 Left 0 SYMATTR InstName R10 SYMATTR Value 9k SYMBOL res -448 304 R0 SYMATTR InstName R9 SYMATTR Value 3k SYMBOL nmos 192 160 R0 WINDOW 0 -34 47 Left 0 WINDOW 3 -76 -9 Left 0 SYMATTR InstName M1 SYMATTR Value IRF6635 SYMBOL Opamps\\\\LT1218 -336 0 R0 WINDOW 0 -76 100 Left 0 WINDOW 3 -100 126 Left 0 SYMATTR InstName U3 SYMBOL Opamps\\\\LT1218 -16 176 R0 WINDOW 0 32 86 Left 0 WINDOW 3 9 115 Left 0 SYMATTR InstName U1 SYMBOL res 224 304 R0 WINDOW 0 -40 46 Left 0 WINDOW 3 -36 74 Left 0 SYMATTR InstName R2 SYMATTR Value 20 TEXT -624 480 Left 0 !.tran 1 uic

The source is DC coupled and ground-referred, and since you're using a single positive DC supply, the output is operating emitter-follower class A and varies about a quiescent Vcc/2.

-- JF

The best course of action is for you to excuse yourself entirely from USENET.

You never "devised" anything in your entire life and you're not likely to. You might get a clue and ask yourself why there are so many varieties of op amps in the first place. Even a mindless parrot would answer that's because there are so many varieties of applications. So your musings are plain stupidity.

Who cares what you desire, get lost.

Thank you John. I am sure this must be what I am looking for, but what program do I import the list into to view the schematic?

Trevor _MORON_

SwitcherCAD free download from Linear:

Once you've got SWCAD, cut/paste Johns information to Notepad and then save it with a .ASC extension. Then open it with SWCAD

Ed