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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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CALCULATOR sa ABACUS sa CALCULATOR SOFTWARE sa COMPUTER xx COMPUTER xx MATHEMATICS How to interface your computer to a printing calculator output device. Described is the connection of an 8080A processor and a Texas Instrument 5050M printing calculator. Tip: How to use an ordinary electronic calculator to perform hexadecimal addition and subtraction. The power of the HP-67 programmable calculator. Part 1. Introduction to learning to use one of the most powerful programmable calculators. The power of the HP-67 programmable calculator. Part 2. An example solution of simultaneous equations. Tip: How to use ordinary calculators for adding and subtracting any numbers using number bases 2 through 99. Product review of the HP-41C pocket calculator. Includes a benchmark program to calculate the present value of a bond with "periodic coupons" and a "Codebreaker" game program. Magnify your calculator's display. Add a simple multiplexing circuit to your handheld calculator's output so you can use half-inch digital displays. Darkroom calculations. Using a pocket calculator to ease your darkroom tasks. Looks at temperature conversion, volume conversion, dilutions, etc. Electronic digital computer can add, subtract, multiply and divide using decimal number input via a telephone dial. Displays answers up to six digits on glowing neon lamps. A complicated and expensive project. Use a slide rule as a frequency calculator. How to pick and choose your pocket calculator using this buyer's point chart. Adapt a common electronic pocket calculator to be a timer which counts elapsed seconds, minutes, hours or other programmed intervals. It can also count down to zero from a starting number. The calculator may still be used by unplugging it from the accessory timing circuit. Hand-calculators, powered by batteries, also can be used as a wideband, RF signal source. Use them to check the RF and IF stages of an AM receiver and as a continuity tester for antennas & connecting cables. Build a wooden stand to convert your pocket calculator into a desk calculator. D-cells installed in the stand can power your calculator for longer periods than the AA cells in the calculator itself. How to troubleshoot and repair electronic calculators. Plug-in power supply for calculator. Delivers either 3 or 9 volts. Est. cost: $6. How to add constant memory to your older pocket calculator. Extend battery life and preserve memory contents by converting older calculator to allow the LED display (only) to be turned off. Selection and repair of "bargain table" electronic items. Tips on troubleshooting electronic calculators, radios, meters, etc. Accessory table for machine tools which require extensive mathematical calculations during use (metal lathe, milling machine, surface grinder, etc). This table has an inexpensive calculator fastened to the top, a note pad, and a pencil. The table is easily attached to the machine when needed. A leather case for a portable electronic calculator is designed to hang from the belt of a surveyor. How to make use of a mini calculator. Calculators for photographers. Suggested uses for the handheld electronic calculator include metric conversion, darkroom exposure calculations, close-up exposure calculations, etc. The hand-held calculator may be the best thing that ever happened to the working photographer. How to use it in photographic work. Electronic desk calculator has 128-word, 1920-bit memory and can add, subtract, multiply, divide and operate on constants. Calculate to 16 digits and display 8 at a time with the display shift key. Est. cost: $180. Build a pocket-size electronic scientific calculator. Features ten digits of mantissa with 2-digit exponent and a full range of scientific options, including double-nested parentheses. Est cost: $90. How to add functions to simple hand calculators. If it has the right IC, you can add extra keys (in the form of switches) to the outside of the case to perform functions like constant storage and percent . Only a minor circuit board change is needed. Build the "Senior Scientist" calculator kit. Features combinatorial, statistical, and probability functions, plus ten levels of addressible memory. Est. cost: $115. Theft alarm for handheld calculator sounds off when the calculator is unplugged from its charger. Selecting and using programmable calculators. Build a scientific calculator using a kit with 72-step storage capacity. Has 5-levels of nested parentheses and 10 level memory register. Est. cost: $65. How to use the Hewlett-Packard HP-45 calculator as a stopwatch or elapsed-time indicator. Learning electronic theory with hand calculators. Part 3. RC coupling, basic amplifier calculations and RLC relationships. How to convert a "four-banger" calculator for stopwatch functions. Modifying electronic calculators to perform other functions, including: event-counter, timer, digital controller, etc. Electronic calculators, how to choose the right one. Calculators get smaller, smarter and cheaper. Tips on selecting the right one for your needs. How to choose and use a programmable calculator. Pocket calculator stand. Built of wood, the calculator is held at a slight angle for better access. The calculator is locked into the stand and the stand is locked to your desk, thus reducing the chance of theft or borrowing. A portable electronic calculator in the gadget bag of a photographer can assist in making many of the needed calculations for good picture taking. Typical problems and solutions shown. Those incredible new scientific calculators. A review of what is available and what calculations they perform. How to use an inexpensive mini calculator to count, square and cube, use reciprocals. Tricks for expanding the operating range of a pocket calculator. Popular Science readers share their calculator shortcuts. How to have fun with your pocket calculator. The programmable calculator can find many interesting applications in electronics. Some tips. Convert your old calculator into a (1) digital capacitance meter, (2) digital ohmmeter, (3) digital stopwatch, (4) shutter-speed tester, (5), tachometer, (6) light meter, or (7) speedometer. Neon glow lamps provide the readout for this desk-top calculator that can be programmed to multiply, add and subtract. Est. cost: $14. How to select a programmable calculator. Protect a pocket calculator from dust, liquids, etc. by placing inside a clear, resealable sandwich bag. No need to remove for use. Wooden stand holds a pocket calculator at a convenient angle for use at a desk. | |||||||||
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