for example, LM324
gearhead wrote: > for example, LM324 >
Read all the info. You'll see note 1 "Neither of the input voltages must exceed the magnitude of Vcc+ and Vcc-"
Are you referring to the diodes from both inputs to the power supply rails? Those would certainly be the 'limiting' factor.
GG
I think the PNP input transistors have been doped to produce base emitter reverse break down voltage exceeding the maximum supply voltage rating. This compromise reduces the performance possible with these transistors, but makes using this opamp with open loop inputs, very easy.
Jamie wrote: .
...Including all sorts of DC and low frequency (not audio) signal applications, and audio if you can arrange the load to keep only one side of the output totem pole conducting throughout the waveform (or if distortion is not very important, like alarm buzzers or telephone quality voice).
And also, if I remember correctly, the LM324 is one of those op-amps that has a discontinued output. meaning, when the follower outputs cross the zero path or near it, there is no minimum bias for both rails being applied to maintain constant current. In a way, this is good in equipment that wants to save on energy when it's used in things like OSC's, voltage comparator etc..
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this.
You mean 'do the input transistors' b-e junctions go into avalanche breakdown' ?
It's always puzzled me too.
You'd probably need to ask an analog IC designer.
Graham
More use of weird and wacky nomenclature from Jamie the Clueless.
Did you mean 'the output stage has zero quiescent current' ? In which case I believe the answer is yes, or 'close to zero'.
I fail to see why you introduced this, since it has nothing to do with the OP's question.
Graham
OP's
Yet that is exactly what YOU do.
My answers are normally short and succinct and keep to topic, whereas yours are rambling, off-topic and full of errors including 'using the wrong words'.
Graham
Yes, I remember years ago when I run into a problem with a 324 going into oscillation in a particular circuit we were adapting from another op-amp type. the oscillation was only aprox .2 Pk-PK volts. using a feed back cap stopped that how ever, it also added to the miller effect problems. I think what we ended up doing was offsetting the + input via a pot and placing a (-) load on the output to force the OP-amp to correct. We only needed a 0..5 volt output on this OP.
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this.
OP's
He's been sinking into snarling-mad-dog, insult everybody, Roy L Fuchs mode for some time now. Just another sad insult-bot usenut.
John
How big of you !
I learnt a huge amount of electronic knowledge even before I went to Uni/college. Nor did I have anyone to 'put me through' either.
That's because many university lecturers are clueless idiots who are totally divorced from the real world and real world ways of doing things. I had the same problem at UCL.
There is however no excuse not to know what 'quiesent current' means since it's a very widely used term to describe a very important issue. Instead you rambled on about ......
" a discontinued output. meaning, when the follower outputs cross the zero path or near it, there is no minimum bias for both rails being applied to maintain constant current. In a way, this is good in equipment that wants to save on energy when it's used in things like OSC's, voltage comparator etc.. "
Which is a perfect example of the very thing you were criticising. It also makes no damn sense.
Graham
Miller effect in an op-amp circuit ?
Once again, you're using technical terms in an inapproriate way.
Graham
That makes sense.
Hit the books trash.
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this.
OP's
go wipe your ass, you stink. btw, clean your keyboard afterwards. it's most likely full of brown residue and drool.
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this.
OP's
are
Why are you writing nasty invective to someone who is trying to help? You make it extremely difficult to believe your claims.
-- Al in St. Lou
OP's
are
Ha, sorry, but you must be new.. stick around for a bit. you'll get the picture. When he's doing any replies to things I write, it's only to help him self.
Maybe you haven't been here long enough.
Have a good day.
-- "I\'m never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this.
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