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Calculator recommendation?

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MikeK:

--- Quote from: mathsquid on March 07, 2021, 08:53:42 pm ---I have a Casio FX-6300G that can do this sort of thing. I'd imagine any vintage programmable scientific calculator (Casio and Radio Shack brands especially) can do it.  I don't think that most modern non-graphing calculators can do this.

(Technically the GC-6300G is a graphing calculator, but just barely.)

--- End quote ---

Hi mathsquid,

Could you please explain how it would do what I want, from the steps I listed in Reply #2?  Could I just enter a new value for Frequency and it would recalculate  the L?

-Mike

Someone:

--- Quote from: MikeK on March 07, 2021, 09:39:03 pm ---
--- Quote from: mathsquid on March 07, 2021, 08:53:42 pm ---I have a Casio FX-6300G that can do this sort of thing. I'd imagine any vintage programmable scientific calculator (Casio and Radio Shack brands especially) can do it.  I don't think that most modern non-graphing calculators can do this.

(Technically the GC-6300G is a graphing calculator, but just barely.)

--- End quote ---

Hi mathsquid,

Could you please explain how it would do what I want, from the steps I listed in Reply #2?  Could I just enter a new value for Frequency and it would recalculate  the L?

-Mike

--- End quote ---
You might still be thinking more of programmable, and producing a set of steps. That is one of the ways to achieve this sort of result:


* Write a short program that asks for the specific known variables and then calls the equation to find the unknown
* Enter the equation on the screen and use variables/history to bring it back up and quickly recalculate
* Use a numerical solver that will find a solution for any variable
Its that last one which is so powerful, being able to go back and forth between different unknowns. Common: Whats the ideal component value for the cutoff frequency? But I only have E12 series, given their rounded values what would the actual cutoff frequency be? Having to go through the equation in two different solutions.

A solver can do that much more efficiently as you don't have to edit/change/move anything. Below is an example screen from a TI-83? It shows the equation you entered and all the variables below it. Enter the values you do know and press solve on the one you want to calculate. Simple as that (the TI36x mentioned above has a smaller screen and doesn't show the equation at the same time?).

newbrain:
I know it's not the same quality as the classic ones, but I use an HP35S.
Swissmicro are nice, but a bit expensive, and 'real' used HPs are not easy to find.

It's good enough for my purposes, and has the exact function the OP is asking for:
In equation mode (EQN) one can enter a formula with variables, and it wil ask for the unknowns.

It can also solve for any variable if the equation is entered as an equality.

RPN (algebraic too) and no graphics, programmable, in addition to the equation mode.
A bit clunky for base-n calculations.

When not close to it, i use free42 on my phone.
When the calculation is more complicated or needs more than a simple program, it's time for a python jupyter interactive window in VSCode.

emece67:
.

mathsquid:

--- Quote from: MikeK on March 07, 2021, 09:39:03 pm ---
--- Quote from: mathsquid on March 07, 2021, 08:53:42 pm ---I have a Casio FX-6300G that can do this sort of thing. I'd imagine any vintage programmable scientific calculator (Casio and Radio Shack brands especially) can do it.  I don't think that most modern non-graphing calculators can do this.

(Technically the GC-6300G is a graphing calculator, but just barely.)

--- End quote ---

Hi mathsquid,

Could you please explain how it would do what I want, from the steps I listed in Reply #2?  Could I just enter a new value for Frequency and it would recalculate  the L?

-Mike

--- End quote ---

It's been a few years since I've done this, but I think that programming these vintage Casios is more like setting up a macro that can be reused. Rather than trying to remember it, I'll point you to a manual for the calculator (http://www.usersmanualguide.com/casio/calculators/fx-6300g), and I'm attaching a few screenshots of the relevant section.

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