Op Amp Calculations
in [Design]
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From: Jim Thompson on 7 Oct 2005 15:51 On Fri, 7 Oct 2005 15:48:16 -0400, Keith Williams <krw(a)att.bizzzz> wrote: >In article <v2idk158isrmlagtf0dicrf78mm2o20dvt(a)4ax.com>, >thegreatone(a)example.com says... >> On Fri, 7 Oct 2005 14:47:07 -0400, Keith Williams <krw(a)att.bizzzz> >> wrote: >> >> >In article <oefdk11h47a0f7ultm1lele4lpsf4sfihp(a)4ax.com>, >> >thegreatone(a)example.com says... >> >> On Fri, 07 Oct 2005 18:07:00 GMT, Rich Grise <rich(a)example.net> wrote: >> >> >> >> >On Thu, 06 Oct 2005 13:08:07 -0700, Jim Thompson wrote: >> >> > >> >> >> On Fri, 07 Oct 2005 09:01:41 +1300, Terry Given <my_name(a)ieee.org> >> >> >> wrote: >> >> >> >> >> >>>Jim Thompson wrote: >> >> >>>> On Thu, 06 Oct 2005 15:39:08 GMT, Fred Bloggs <nospam(a)nospam.com> >> >> >>>> wrote: >> >> >> [snip] >> >> >>>> >> >> >>>> That's still insufficient. Good engineering practice would limit base >> >> >>>> drive from the OpAmp AND also the collector current of the 2nd >> >> >>>> transistor. >> >> >>>> >> >> >>>> ...Jim Thompson >> >> >>> >> >> >>>Thanks Jim, thats pretty much what I figured. Its like driving, really. >> >> >>>any fool can drive on a straight, flat road with no traffic and good >> >> >>>visibility. Going round a corner sideways in the pouring rain, with a >> >> >>>logging truck coming towards you, sorts the men from the boys. >> >> >>> >> >> >>>Cheers >> >> >>>Terry >> >> >> >> >> >> I did that once on snow. Nothing like sliding sideways, down a hill >> >> >> yet, and dodging traffic, to put some "age" on you ;-) >> >> >> >> >> >Ever tried fishtailing on the freeway at 55MPH on black ice? That's >> >> >kind of a rush too. ;-) >> >> > >> >> >Cheers! >> >> >Rich >> >> > >> >> >> >> I drove the Pennsylvania Turnpike from west-end-to-east-end one time >> >> with an eery feeling of never quite touching the ground ;-) >> > >> >I drove I80 W->E across PA on about an inch of ice one time. It was raining >> >and freezing so fast that I had to put the defroster on high enough that I had >> >to open the windows so my hair wouldn't catch fire. ;-) We finally broke free >> >of the storm around Stroudsburg after 10 hours of white-knuckle driving. We >> >only had about three hours driving time to get home but the wife said, no >> >(*she* was too tired)! We stayed the night in a hotel, only to fight the storm >> >again the next day. :-( >> >> Well, if we're going to play "Can you top that" ;-) > >Oh, yeah! > >> Drove across Oklahoma one winter in so much cold rain that I had to >> defrost using the air conditioning :-( > >You had an Oklahoma?! Wait... > >(The AC in my truck is on whenever the defroster is on) Newer vehicles have that feature... this was in 1964, when A/C was still pretty much "add-on". ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: keith on 7 Oct 2005 21:19 On Fri, 07 Oct 2005 12:51:14 -0700, Jim Thompson wrote: > On Fri, 7 Oct 2005 15:48:16 -0400, Keith Williams <krw(a)att.bizzzz> > wrote: > >>In article <v2idk158isrmlagtf0dicrf78mm2o20dvt(a)4ax.com>, >>thegreatone(a)example.com says... >>> On Fri, 7 Oct 2005 14:47:07 -0400, Keith Williams <krw(a)att.bizzzz> >>> wrote: >>> >>> >In article <oefdk11h47a0f7ultm1lele4lpsf4sfihp(a)4ax.com>, >>> >thegreatone(a)example.com says... >>> >> On Fri, 07 Oct 2005 18:07:00 GMT, Rich Grise <rich(a)example.net> wrote: >>> >> >>> >> >On Thu, 06 Oct 2005 13:08:07 -0700, Jim Thompson wrote: >>> >> > >>> >> >> On Fri, 07 Oct 2005 09:01:41 +1300, Terry Given <my_name(a)ieee.org> >>> >> >> wrote: >>> >> >> >>> >> >>>Jim Thompson wrote: >>> >> >>>> On Thu, 06 Oct 2005 15:39:08 GMT, Fred Bloggs <nospam(a)nospam.com> >>> >> >>>> wrote: >>> >> >> [snip] >>> >> >>>> >>> >> >>>> That's still insufficient. Good engineering practice would limit base >>> >> >>>> drive from the OpAmp AND also the collector current of the 2nd >>> >> >>>> transistor. >>> >> >>>> >>> >> >>>> ...Jim Thompson >>> >> >>> >>> >> >>>Thanks Jim, thats pretty much what I figured. Its like driving, really. >>> >> >>>any fool can drive on a straight, flat road with no traffic and good >>> >> >>>visibility. Going round a corner sideways in the pouring rain, with a >>> >> >>>logging truck coming towards you, sorts the men from the boys. >>> >> >>> >>> >> >>>Cheers >>> >> >>>Terry >>> >> >> >>> >> >> I did that once on snow. Nothing like sliding sideways, down a hill >>> >> >> yet, and dodging traffic, to put some "age" on you ;-) >>> >> >> >>> >> >Ever tried fishtailing on the freeway at 55MPH on black ice? That's >>> >> >kind of a rush too. ;-) >>> >> > >>> >> >Cheers! >>> >> >Rich >>> >> > >>> >> >>> >> I drove the Pennsylvania Turnpike from west-end-to-east-end one time >>> >> with an eery feeling of never quite touching the ground ;-) >>> > >>> >I drove I80 W->E across PA on about an inch of ice one time. It was raining >>> >and freezing so fast that I had to put the defroster on high enough that I had >>> >to open the windows so my hair wouldn't catch fire. ;-) We finally broke free >>> >of the storm around Stroudsburg after 10 hours of white-knuckle driving. We >>> >only had about three hours driving time to get home but the wife said, no >>> >(*she* was too tired)! We stayed the night in a hotel, only to fight the storm >>> >again the next day. :-( >>> >>> Well, if we're going to play "Can you top that" ;-) >> >>Oh, yeah! >> >>> Drove across Oklahoma one winter in so much cold rain that I had to >>> defrost using the air conditioning :-( >> >>You had an Oklahoma?! Wait... >> >>(The AC in my truck is on whenever the defroster is on) > > Newer vehicles have that feature... You misspelled "feechur". Forcing one to run the compressor when using the defroster is nutz! > this was in 1964, when A/C was still pretty much "add-on". Had AC been invented? ;-) I learned to drive on a '64 Ford Custom (in '68), no AC, no auto, no power (brake or steering). I bought a similar car in '78. A (then) new Ford Granada ESS (also no AC, auto, or power); great car! No one would believe there was ever an ESS with a stick. ;-) -- Keith
From: Jim Thompson on 7 Oct 2005 21:43 On Fri, 07 Oct 2005 21:19:13 -0400, keith <krw(a)att.bizzzz> wrote: >On Fri, 07 Oct 2005 12:51:14 -0700, Jim Thompson wrote: > [snip] > >> this was in 1964, when A/C was still pretty much "add-on". > >Had AC been invented? ;-) I learned to drive on a '64 Ford Custom (in >'68), no AC, no auto, no power (brake or steering). I bought a similar >car in '78. A (then) new Ford Granada ESS (also no AC, auto, or power); >great car! No one would believe there was ever an ESS with a stick. ;-) I learned to drive in a '56 Mercury station wagon, in '56 ;-) The power steering failed as I was trying to pass "parallel" parking. I managed to get it in the space anyway ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
From: Rich Grise on 7 Oct 2005 22:38 On Fri, 07 Oct 2005 11:42:33 -0700, Winfield Hill wrote: > Jim Thompson wrote... >> >> I drove the Pennsylvania Turnpike from west-end-to-east-end one >> time with an eery feeling of never quite touching the ground ;-) > > When one drives all the way across the country at one go, > one gets that feeling at various points. I think the weirdest driving experience I've ever had was the summer between 11th and 12th grades. I had a "summer job": part time busboy/dishwasher. The commute was about 10 miles, on Highway 12, which has since been replaced by I-94. (Wayzata to St. Louis Park, MN.) Anyway, it was a really really boring drive. I had heard about "highway hypnosis", and all that safety stuff they try to indoctrinate kids with. Anyway, One time, I got off work, jumped in the car, headed down the highway, and the next thing I noticed, I was already home. And this was before I drank, smoked, or smoked! (but I was 16, so could have been a victim of testosterone poisoning. ;-) ) (the point was, there was about 10 minutes of commute time that I completely spaced out on and didn't even remember driving. If I'd crashed, it would have been my fault. I guess that's when I decided, "In the car, be on Red Alert at all times!") Cheers! Rich
From: Rich Grise on 7 Oct 2005 22:44
On Fri, 07 Oct 2005 12:12:48 -0700, Jim Thompson wrote: > On Fri, 7 Oct 2005 14:47:07 -0400, Keith Williams <krw(a)att.bizzzz> > wrote: > >>In article <oefdk11h47a0f7ultm1lele4lpsf4sfihp(a)4ax.com>, >>thegreatone(a)example.com says... >>> On Fri, 07 Oct 2005 18:07:00 GMT, Rich Grise <rich(a)example.net> wrote: >>> >>> >On Thu, 06 Oct 2005 13:08:07 -0700, Jim Thompson wrote: >>> > >>> >> On Fri, 07 Oct 2005 09:01:41 +1300, Terry Given <my_name(a)ieee.org> >>> >> wrote: >>> >> >>> >>>Jim Thompson wrote: >>> >>>> On Thu, 06 Oct 2005 15:39:08 GMT, Fred Bloggs <nospam(a)nospam.com> >>> >>>> wrote: >>> >> [snip] >>> >>>> >>> >>>> That's still insufficient. Good engineering practice would limit base >>> >>>> drive from the OpAmp AND also the collector current of the 2nd >>> >>>> transistor. >>> >>>> >>> >>>> ...Jim Thompson >>> >>> >>> >>>Thanks Jim, thats pretty much what I figured. Its like driving, really. >>> >>>any fool can drive on a straight, flat road with no traffic and good >>> >>>visibility. Going round a corner sideways in the pouring rain, with a >>> >>>logging truck coming towards you, sorts the men from the boys. >>> >>> >>> >>>Cheers >>> >>>Terry >>> >> >>> >> I did that once on snow. Nothing like sliding sideways, down a hill >>> >> yet, and dodging traffic, to put some "age" on you ;-) >>> >> >>> >Ever tried fishtailing on the freeway at 55MPH on black ice? That's >>> >kind of a rush too. ;-) >>> > >>> >Cheers! >>> >Rich >>> > >>> >>> I drove the Pennsylvania Turnpike from west-end-to-east-end one time >>> with an eery feeling of never quite touching the ground ;-) >> >>I drove I80 W->E across PA on about an inch of ice one time. It was raining >>and freezing so fast that I had to put the defroster on high enough that I had >>to open the windows so my hair wouldn't catch fire. ;-) We finally broke free >>of the storm around Stroudsburg after 10 hours of white-knuckle driving. We >>only had about three hours driving time to get home but the wife said, no >>(*she* was too tired)! We stayed the night in a hotel, only to fight the storm >>again the next day. :-( > > Well, if we're going to play "Can you top that" ;-) > > Drove across Oklahoma one winter in so much cold rain that I had to > defrost using the air conditioning :-( > > ...Jim Thompson Oklahoma, hm? OK, one time driving from So. Cal. to Minnesota, while passing through the OK/TX panhandle, there was a dust storm. Visibility was about 100 feet. On the right side of the highway, I spotted a cinder- block building with "COLD BEER" painted on the side in 8' high letters. So I stopped. I mentioned "Gee, I've been snowed in before, but this is the first time I've ever been dusted in" or some such clever thing. The bartender said, "Welcome to fuckin' Oklahoma." Sometimes, being snowed in isn't all that bad of a deal. ;-) Or, if you like cold, there was the time my thermostat got stuck (in MN) and snow was coming out the vents, until the radiator hose popped. Cheers! Rich |