Tag: guide
42 articles tagged with "guide"
555 Timer Circuits — Blink an LED, Build an Oscillator
Build practical 555 timer circuits in astable and monostable modes. Includes formulas, component selection, and a free online calculator.
Capacitor Codes Demystified — 3-Digit Ceramic Capacitor Guide
Decode ceramic capacitor markings instantly. Learn the 3-digit code system, common values, and how capacitance relates to frequency filtering.
How to Choose the Right Resistor for an LED
Calculate the correct current-limiting resistor for any LED. Covers forward voltage, standard resistor values, and common mistakes.
Cooking Tools — Unit Converter, Recipe Scaler & Oven Temperature
Convert cups to grams, scale recipes up or down, and convert oven temperatures between Celsius, Fahrenheit, and Gas Mark.
Design Tools — Color Palette, Aspect Ratio, DPI Calculator & Favicon Generator
Generate color palettes, calculate aspect ratios, check screen DPI, and create favicons — free design tools that run in your browser.
16 Developer Tools You'll Actually Use Every Day
JSON formatting, regex testing, JWT decoding, subnet calculation, and more — a walkthrough of the raatools developer toolkit.
Money Tools — Loans, Budgets, Salary, Taxes & More
Plan your budget, calculate loan payments, convert salaries, estimate taxes, and figure out take-home pay with these free finance tools.
Internet Tools — IP Lookup, DNS, Whois, SSL & More
Check your IP, inspect DNS records, look up domain registration, verify SSL certificates, and analyze HTTP headers — free internet diagnostic tools.
Quick Math — Percentages, Fractions, GPA, Tips & More
Seven simple math tools for everyday calculations — percentages, fractions, GPA, tips, age, Roman numerals, and number-to-words.
Ohm's Law and the Power Triangle — Every Formula You Need
Master Ohm's Law and the power formula with practical examples. Calculate voltage, current, resistance, and wattage for any circuit.
PCB Design Basics — Trace Width, Current & Heat
Learn PCB trace width sizing with the IPC-2221 standard. Covers current capacity, temperature rise, copper weight, and a free trace width calculator.
Resistor Color Codes Explained — Read Any Resistor in Seconds
Learn how to read 4-band and 5-band resistor color codes. Free chart and interactive decoder tool — no guessing required.
SEO Tools — Meta Tags, Open Graph, SERP Preview & More
Generate meta tags, preview Open Graph cards, check Google SERP appearance, build robots.txt files, and analyze keyword density — free SEO tools.
SMD Resistor Codes Explained — 3-Digit, 4-Digit, EIA-96
Decode SMD resistor markings instantly. Covers 3-digit, 4-digit, R-notation, and EIA-96 code systems with examples and a free decoder tool.
Time Tools — Zone Converter, Date Calculator, Countdown & More
Convert time zones, calculate date differences, set countdowns, and do time math — free browser-based time tools.
Voltage Dividers: The Most Useful Circuit You'll Ever Build
Understand voltage dividers with practical examples. Learn the formula, when to use them, and common pitfalls with loaded outputs.
BMR and TDEE Calculator Using Mifflin-St Jeor
Calculate your basal metabolic rate and daily calorie needs with the Mifflin-St Jeor equation. Includes macro split.
DNA to Protein Translation Tool
Paste a DNA or RNA sequence and get the complementary strand, mRNA, and protein translation with color-coded codons.
Electron Configuration Visualizer for Every Element
Click any element to see its full electron configuration, noble gas shorthand, and orbital filling diagram.
How to Balance Chemical Equations Instantly
Struggling with balancing chemical equations? This tool shows you the balanced result and explains each step.
SUVAT Kinematics Calculator: Solve Any Motion Problem
Enter three of the five SUVAT variables and instantly get the other two. Shows which equation was used.
Fast Molar Mass Calculator for Any Chemical Formula
Need a quick molar mass lookup? Type any formula and get the molecular weight plus element breakdown instantly.
Moon Phase Calculator for Any Date
Find the moon phase, illumination percentage and lunar age for any date. Includes a 14-day forecast strip.
Ohm's Law Calculator and Resistor Color Code Decoder
Calculate voltage, current and resistance with Ohm's Law. Plus decode 4-band and 5-band resistor color codes.
pH, pOH and Hydrogen Ion Concentration Made Simple
Convert between pH, pOH and ion concentrations instantly. Includes a visual scale with common substances.
Planet Comparison Tool: Weight on Other Planets
Compare planets side by side — gravity, size, day length — and calculate what you'd weigh on Mars, Jupiter or any world.
Projectile Motion Simulator with Adjustable Gravity
Launch a projectile with custom angle, speed and gravity. See the trajectory, max height, range and flight time.
Punnett Square Generator for Genetics
Generate Punnett squares for monohybrid and dihybrid crosses. See genotype and phenotype ratios instantly.
Radioactive Decay and Half-Life Simulator
Pick an isotope, set the initial mass, and watch exponential decay unfold on an interactive SVG chart.
Solar System to Scale: See the Real Distances
Visualize the solar system with accurate relative distances or sizes. Zoom, pan, and switch between distance and size modes.
Dilution Calculator: Solve C₁V₁ = C₂V₂ for Any Variable
Solve dilution problems instantly. Enter three values and the calculator finds the fourth — supports M, mM, µM, mL, µL.
Thin Lens Ray Diagram Calculator
Interactive ray diagram for converging and diverging lenses. Drag the object to see how the image changes in real time.
Wave Interference Visualizer: See Superposition in Action
Adjust amplitude, frequency and phase of two waves and watch constructive and destructive interference in real time.
Why Learn Math? Real-Life Examples You'll Actually Use
Math isn't just for exams — it's how you check your paycheck, compare deals, and avoid getting ripped off. Here's where you'll actually use it.
Morse Code, Braille & NATO Alphabet — The Communication Tools
Translate text to Morse code, Braille, or the NATO phonetic alphabet — fun tools with real-world uses.
Units, Colors, Currencies & QR Codes — The raatools Conversion Tools
Convert anything — units, temperatures, currencies, colors, and even text to QR codes. All free, all in your browser.
GSM Provider Lookup — Find Out Who's Behind a Mobile Number
Look up GSM providers by MCC/MNC codes — handy for telecom work and international travel.
Your Image Toolkit — Compress, Resize, Convert & Crop
A practical guide to the raatools image tools — compress, resize, convert, and crop images right in your browser.
Merge, Split, Compress — Your Guide to the raatools PDF & File Tools
Learn how to merge, split, and compress PDFs plus encode files with Base64 — all in your browser, no uploads needed.
BMI Calculator, Age Generator & Typing Test
Check your BMI, generate random ages, or test your typing speed — a few handy tools that didn't fit anywhere else.
MAC Lookup, Bluetooth Vendors & Antenna Frequencies
Tools for radio enthusiasts and network nerds — look up MAC addresses, Bluetooth vendors, and calculate antenna frequencies.
Clean Up Your Text — Word Count, Case Converter & More
Count words, change case, remove duplicates, generate placeholder text, and preview Markdown — five text tools that save you time.