voltage divider calcs
in [Design]
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From: John Larkin on 20 Apr 2010 19:56 It's easier to use LT Spice to do a simple resistor string voltage divider analysis than to use a calculator! Much easier if you want to futz with values to hit some targets. Copying the results from the DC analysis window requires highlighting and ctrl/c to get the text into the clipboard. There's no obvious "print" or "copy" or "save" things. Interesting that Scad3.exe is only 5.4 megabytes. John
From: Joerg on 20 Apr 2010 20:37 John Larkin wrote: > It's easier to use LT Spice to do a simple resistor string voltage > divider analysis than to use a calculator! Much easier if you want to > futz with values to hit some targets. > > Copying the results from the DC analysis window requires highlighting > and ctrl/c to get the text into the clipboard. There's no obvious > "print" or "copy" or "save" things. > There is: File -> Print, or save ... :-) For writing to a bmp file you have to go to the Tools tab. > Interesting that Scad3.exe is only 5.4 megabytes. > Mike Engelhardt sure knows how to program. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: krw on 22 Apr 2010 19:47 On Thu, 22 Apr 2010 19:32:58 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Jim Thompson wrote: >> >> On Thu, 22 Apr 2010 19:23:17 -0400, "Michael A. Terrell" >> <mike.terrell(a)earthlink.net> wrote: >> >> > >> >Jim Thompson wrote: >> >> >> >> On Thu, 22 Apr 2010 09:56:26 -0700, John Larkin >> >> <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >> >> >> [snip] >> >> > >> >> >Stupid Windows won't allow me to hide the ugly icon. Or to change the >> >> >icon to something more appropriate. Microsoft writes garbage. >> >> > >> >> [snip] >> >> >> >> Is that Windows 7 ?? >> >> >> >> I certainly can hide it with Windows XP. >> > >> > >> > I wonder if '7' is the IQ of the ad agency that's doing the new >> >commercials? >> >> I'm getting concerned with all the horror stories I'm hearing about >> Windows 7. >> >> My PC collection is getting aged (except for the laptop), so >> replacement is in the air :-( > > > You can still upgrade your XP computers with new motherboards RAM and >hard drives, but who knows how long before MS drops all support & >updates? They've got to get corporations (well, one anyway) to roll out '7' first. My computer at work was just replaced, with an XP box.
From: Jim Thompson on 22 Apr 2010 19:51 On Thu, 22 Apr 2010 19:32:58 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >Jim Thompson wrote: >> >> On Thu, 22 Apr 2010 19:23:17 -0400, "Michael A. Terrell" >> <mike.terrell(a)earthlink.net> wrote: >> >> > >> >Jim Thompson wrote: >> >> >> >> On Thu, 22 Apr 2010 09:56:26 -0700, John Larkin >> >> <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >> >> >> [snip] >> >> > >> >> >Stupid Windows won't allow me to hide the ugly icon. Or to change the >> >> >icon to something more appropriate. Microsoft writes garbage. >> >> > >> >> [snip] >> >> >> >> Is that Windows 7 ?? >> >> >> >> I certainly can hide it with Windows XP. >> > >> > >> > I wonder if '7' is the IQ of the ad agency that's doing the new >> >commercials? >> >> I'm getting concerned with all the horror stories I'm hearing about >> Windows 7. >> >> My PC collection is getting aged (except for the laptop), so >> replacement is in the air :-( > > > You can still upgrade your XP computers with new motherboards RAM and >hard drives, but who knows how long before MS drops all support & >updates? Would that be a loss ?:-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: Mikko=?iso-8859-1?Q?Syrj=C3=A4lahti?= on 22 Apr 2010 10:14
John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> writes: > It's easier to use LT Spice to do a simple resistor string voltage > divider analysis than to use a calculator! Much easier if you want to > futz with values to hit some targets. I've been thinking of buying cheap coding to do javascript-based calculator for this. If anybody here would like to comment on most wanted features, I'll get it coded on rentacoder.com and will share the SW under BSD license. Basic calculations -Input ratio, find closest matches from E12-E96 series, with error -Input ratio+output impedance, do the same -Input resistance value, find closest series/parallel combination from E12-E96 series -Input SMD code, output value -Input value, output possible SMD codes -Input any two of R1, R2, Rp, Rs -> output others -Entry formats: 5120, 5k21, 0R1, 10M -Calculations performed right when entered, no reloads or anything needed Based on these: -Input voltage, output resistor combinations for TL431/TLV431 -Input voltage, output reasonable resistor combinations for LM317 -Input frequency, output reasonable (how to define ?) resistors+caps for 555 Bonuses: Cut&paste available resistors into textbox. Values stored to cookie (or database, which would require serverside software..). Do the previous stuff with these values. Forgot something ? -- Mikko |