## Thursday, January 14, 2016

### HP 15C: Reactance Chart Solver

HP 15C: Reactance Chart Solver

Source:  HP-65 E.E. PAC 1.  Hewlett Packard.  September 1974.  pg. 8-9

Equation:

2 * π * f * √(L*C) = 1

Variables:

R0 = f = Resonant Frequency (Hz)
R1 = L = inductance (henrys)
R2 = C = capacitance (farads)

Instructions:

Enter the known values in each of the variables.  Enter the number of the variable to be solved in register I ( [ STO ] [ TAN ] (I) ).  To solve, enter a range, and press [ f ] [ ÷ ] (SOLVE), [ y^x ] (D). (*or whatever label you assigned this program to)

Program:

 Step Key Key Code 001 LBL D 42, 21, 14 002 STO (i) 44, 24 003 2 2 004 π 43, 26 005 * 20 006 RCL* 0 45, 20, 0 007 RCL 1 45, 1 008 RCL* 2 45, 20, 2 009 √ 11 010 * 20 011 1 1 012 - 30 013 RTN 43, 32

Example:

L = R1 = 2.5 H, f = R0 = 60 Hz.  Calculate C (R2).  Store 2 in RI.

Result:  R ≈ 2.8145 E-06  (use range 0 to 1)

This blog is property of Edward Shore. 2016

### TI-84+ and Casio Micropython (fx-CG50): Solving Equations Involving Factorials (Inverse Factorial)

TI-84+ and Casio Micropython (fx-CG50):  Inverse Factorial of Integer Introduction The goal is to solve the equation for n: x = n! ...