Independent guides to radio history & electronics hobbies, with equipment comparisons, useful planning tools and practical explanations.https://oldradiobuilder.com/enhttps://oldradiobuilder.com/calculators/battery-parallel-capacity-calculator/https://oldradiobuilder.com/calculators/battery-parallel-capacity-calculator/Estimate the nominal capacity and stored energy of batteries connected in parallel. Enter each battery's capacity and nominal voltage. The calculation assumes compatible batteries at the same voltage and sums their ratings without accounting for age, temperature, wiring losses, or discharge limits.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorBattery Parallel Capacity Calculatorhttps://oldradiobuilder.com/calculators/battery-series-voltage-calculator/https://oldradiobuilder.com/calculators/battery-series-voltage-calculator/Estimate a battery pack’s nominal voltage by adding the voltage contributions of cells connected in series. Enter the nominal voltage and count for each cell group. This calculator does not estimate loaded voltage, capacity, runtime, or charging requirements.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorBattery Series Voltage Calculatorhttps://oldradiobuilder.com/calculators/capacitor-parallel-value-calculator/https://oldradiobuilder.com/calculators/capacitor-parallel-value-calculator/Add the capacitance values of capacitors connected in parallel to find their ideal total capacitance. Enter each capacitor value in microfarads (µF).Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorCapacitor Parallel Value Calculatorhttps://oldradiobuilder.com/calculators/capacitor-series-value-calculator/https://oldradiobuilder.com/calculators/capacitor-series-value-calculator/Calculate the equivalent capacitance of capacitors connected in series using each capacitor's value in microfarads (µF).Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorCapacitor Series Value Calculatorhttps://oldradiobuilder.com/calculators/circuit-component-cost-calculator/https://oldradiobuilder.com/calculators/circuit-component-cost-calculator/Estimate the parts cost of a hobby circuit build from component quantities and unit prices, plus an optional shipping allowance. Enter prices in your chosen currency. This estimates listed parts and shipping only; it excludes taxes, tools, and labor.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorCircuit Component Cost Calculatorhttps://oldradiobuilder.com/calculators/electrical-power-calculator/https://oldradiobuilder.com/calculators/electrical-power-calculator/Calculate electrical power in watts from voltage and current using the direct-current relationship P = V × I. Enter voltage in volts and current in amperes.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorElectrical Power Calculatorhttps://oldradiobuilder.com/calculators/electronics-project-budget-calculator/https://oldradiobuilder.com/calculators/electronics-project-budget-calculator/Estimate a hobby electronics project's total budget from parts, tools, shipping, and a user-selected contingency allowance.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorElectronics Project Budget Calculatorhttps://oldradiobuilder.com/calculators/frequency-to-wavelength-calculator/https://oldradiobuilder.com/calculators/frequency-to-wavelength-calculator/Convert a radio frequency into its free-space wavelength using the speed of light. Enter frequency in hertz and choose a practical output unit.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorFrequency To Wavelength Calculatorhttps://oldradiobuilder.com/calculators/lc-resonant-frequency-calculator/https://oldradiobuilder.com/calculators/lc-resonant-frequency-calculator/Calculate the ideal resonant frequency of an LC circuit from its inductance and capacitance. Enter component values and select their units to get the frequency in hertz.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorLc Resonant Frequency Calculatorhttps://oldradiobuilder.com/calculators/led-series-resistor-calculator/https://oldradiobuilder.com/calculators/led-series-resistor-calculator/Calculate the ideal series resistance for one LED from the supply voltage, LED forward voltage, and target current. The result is theoretical and does not select a resistor rating or account for component tolerances.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorLed Series Resistor Calculatorhttps://oldradiobuilder.com/calculators/ohm-law-calculator/https://oldradiobuilder.com/calculators/ohm-law-calculator/Calculate electrical voltage in a simple resistive circuit by multiplying the supplied current by resistance. This tool demonstrates Ohm's law and does not assess component safety or circuit performance.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorOhm Law Calculatorhttps://oldradiobuilder.com/calculators/parallel-resistance-calculator/https://oldradiobuilder.com/calculators/parallel-resistance-calculator/Calculate the equivalent resistance of three resistors connected in parallel using their resistance values in ohms.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorParallel Resistance Calculatorhttps://oldradiobuilder.com/calculators/parts-bin-capacity-calculator/https://oldradiobuilder.com/calculators/parts-bin-capacity-calculator/Estimate the number of identical parts that fit in a bin by dividing usable bin volume by the volume of one part. This volume-based estimate assumes the parts can be packed without gaps; actual capacity depends on shape and arrangement.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorParts Bin Capacity Calculatorhttps://oldradiobuilder.com/calculators/radio-frequency-unit-conversion-calculator/https://oldradiobuilder.com/calculators/radio-frequency-unit-conversion-calculator/Convert a radio frequency value between hertz, kilohertz, megahertz, and gigahertz using exact metric scale factors.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorRadio Frequency Unit Conversion Calculatorhttps://oldradiobuilder.com/calculators/radio-listening-electricity-cost-calculator/https://oldradiobuilder.com/calculators/radio-listening-electricity-cost-calculator/Estimate the electricity cost of listening to a radio over a chosen period using its power draw, listening time, and your electricity rate. The estimate assumes the radio draws the stated power whenever it is on.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorRadio Listening Electricity Cost Calculatorhttps://oldradiobuilder.com/calculators/rc-time-constant-calculator/https://oldradiobuilder.com/calculators/rc-time-constant-calculator/Calculate the time constant of a resistor-capacitor circuit from resistance and capacitance. The result is the time required for a first-order RC circuit to complete about 63.2% of its total voltage change during charging or discharging.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorRc Time Constant Calculatorhttps://oldradiobuilder.com/calculators/resistor-color-code-calculator/https://oldradiobuilder.com/calculators/resistor-color-code-calculator/Decode a conventional four-band resistor using two significant-digit bands, a multiplier and one of four listed tolerance bands. The output is the lower-to-upper resistance interval in ohms, not a power or voltage rating.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorResistor Color Code Calculatorhttps://oldradiobuilder.com/calculators/series-resistance-calculator/https://oldradiobuilder.com/calculators/series-resistance-calculator/Calculate the total resistance of resistors connected in series by adding their resistance values. Enter each resistor in ohms.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorSeries Resistance Calculatorhttps://oldradiobuilder.com/calculators/voltage-divider-calculator/https://oldradiobuilder.com/calculators/voltage-divider-calculator/Calculate the ideal output voltage of a two-resistor voltage divider from the supply voltage and resistor values. Assumes an unloaded output and ideal components.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorVoltage Divider Calculatorhttps://oldradiobuilder.com/calculators/workbench-surface-area-calculator/https://oldradiobuilder.com/calculators/workbench-surface-area-calculator/Estimate the top surface area of a rectangular workbench from its length and width. Enter both measurements in inches to get the area in square feet and square inches.Thu, 12 Nov 2026 00:00:00 GMTCalculatorscalculatorWorkbench Surface Area Calculatorhttps://oldradiobuilder.com/statistics/amateur-radio-license-counts-statistics/https://oldradiobuilder.com/statistics/amateur-radio-license-counts-statistics/A clear look at U.S. amateur radio license counts by state and territory, license class, and national total, based on ARRL figures through November 10, 2026.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsamateur radioFCC licenseslicense countsUnited Stateshttps://oldradiobuilder.com/statistics/audio-listening-time-statistics/https://oldradiobuilder.com/statistics/audio-listening-time-statistics/Compare UK radio, music and podcast listening time across platforms, places, stations and audiences.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsaudio listeningradiomusicpodcastshttps://oldradiobuilder.com/statistics/community-radio-stations-statistics/https://oldradiobuilder.com/statistics/community-radio-stations-statistics/UK and Australian figures on community radio governance, volunteers, finances, social gain, specialist services and music output.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticscommunity radioUK radioAustralian radiohttps://oldradiobuilder.com/statistics/consumer-electronics-recycling-statistics/https://oldradiobuilder.com/statistics/consumer-electronics-recycling-statistics/EPA U.S. recovery data through 2018 and global e-waste generation, collection, material, and policy statistics for 2022 and 2023.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsconsumer electronicsrecyclinge-wastehttps://oldradiobuilder.com/statistics/electronic-component-manufacturing-employment-statistics/https://oldradiobuilder.com/statistics/electronic-component-manufacturing-employment-statistics/U.S. payroll, subsector, occupation, projection, wage, and historical employment figures from BLS sources.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsmanufacturing employmentelectronicssemiconductorshttps://oldradiobuilder.com/statistics/electronics-hobby-participation-statistics/https://oldradiobuilder.com/statistics/electronics-hobby-participation-statistics/Survey findings on electronics interests, prototyping projects, tools, learning practices, and making copies.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticselectronics hobbiesamateur radioprototypinghttps://oldradiobuilder.com/statistics/electronics-repair-business-counts-statistics/https://oldradiobuilder.com/statistics/electronics-repair-business-counts-statistics/Historical U.S. statistics on consumer electronics repair establishments, employment, and annual wages, with selected state figures and clear notes on what the industry counts include.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticselectronics repairsmall businessestablishmentsemploymenthttps://oldradiobuilder.com/statistics/electronics-technician-employment-statistics/https://oldradiobuilder.com/statistics/electronics-technician-employment-statistics/National employment, industry, projection, wage, state, and related repair data for electrical and electronic engineering technicians.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticselectronics techniciansemploymentwageshttps://oldradiobuilder.com/statistics/emergency-radio-ownership-statistics/https://oldradiobuilder.com/statistics/emergency-radio-ownership-statistics/Historical findings on household battery-radio preparedness, state and demographic differences, NOAA Weather Radio ownership, and survey scope.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsemergency radioNOAA Weather Radiosurvey datahttps://oldradiobuilder.com/statistics/fm-radio-station-counts-statistics/https://oldradiobuilder.com/statistics/fm-radio-station-counts-statistics/A clear guide to FCC counts for commercial FM, noncommercial FM, low-power FM, and FM translators and boosters, with dated comparisons and scope notes.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsFM radioradio stationsFCCbroadcastinghttps://oldradiobuilder.com/statistics/household-radio-ownership-statistics/https://oldradiobuilder.com/statistics/household-radio-ownership-statistics/Census and survey evidence on household radio ownership across South Africa, Kenya, Rwanda, Tanzania, Zambia, and Poland.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsradio ownershiphouseholdscensussurvey datahttps://oldradiobuilder.com/statistics/maker-space-participation-statistics/https://oldradiobuilder.com/statistics/maker-space-participation-statistics/Evidence from university surveys, youth-serving sites and a maker-community survey on participation, users, tools and experiences.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsmaker spacesparticipationeducationhttps://oldradiobuilder.com/statistics/portable-radio-sales-statistics/https://oldradiobuilder.com/statistics/portable-radio-sales-statistics/Historical portable radio sales figures from Finland and Canada, alongside selected UK and Austrian DAB radio statistics.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsportable radiosradio salesDAB radiohttps://oldradiobuilder.com/statistics/radio-advertising-revenue-statistics/https://oldradiobuilder.com/statistics/radio-advertising-revenue-statistics/Radio advertising revenue statistics from Canadian, U.S. and New Zealand sources, including annual revenue, time sales and digital benchmarks.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsradio advertisingradio revenuedigital advertisinghttps://oldradiobuilder.com/statistics/radio-broadcasting-employment-statistics/https://oldradiobuilder.com/statistics/radio-broadcasting-employment-statistics/A source-based look at radio broadcasting employment, wages, occupational outlook, and station staffing in the United States, European Union, Croatia, and Canada.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsradio broadcastingemploymentwagesmedia industryhttps://oldradiobuilder.com/statistics/shortwave-broadcasting-stations-statistics/https://oldradiobuilder.com/statistics/shortwave-broadcasting-stations-statistics/NASB station estimates and ILGRadio database, power, and monitoring statistics, with each figure kept to its stated scope and period.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsshortwave broadcastingradio statisticsbroadcastinghttps://oldradiobuilder.com/statistics/stem-hobby-participation-statistics/https://oldradiobuilder.com/statistics/stem-hobby-participation-statistics/Historical U.S. survey findings on science-related hobbies, citizen science, informal science visits, and family activities.Thu, 12 Nov 2026 00:00:00 GMTStatisticsstatisticsSTEM hobbiescitizen sciencescience participationhttps://oldradiobuilder.com/blog/how-to-build-a-low-voltage-project-checklist/https://oldradiobuilder.com/blog/how-to-build-a-low-voltage-project-checklist/Plan a low-voltage electronics project with a practical checklist for parts, tools, safe assembly, testing, troubleshooting, and radio compatibility.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-a-bench-light-for-detailed-work/https://oldradiobuilder.com/blog/how-to-choose-a-bench-light-for-detailed-work/Choose bench lighting that reveals small radio parts clearly while controlling glare, shadows, heat, and color distortion.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-a-magnifier-for-an-electronics-bench/https://oldradiobuilder.com/blog/how-to-choose-a-magnifier-for-an-electronics-bench/Choose bench magnification by matching lens, working distance, lighting, and stability to the electronics work you actually do.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-a-multimeter-for-low-voltage-projects/https://oldradiobuilder.com/blog/how-to-choose-a-multimeter-for-low-voltage-projects/Choose a multimeter for radio restoration and low-voltage projects by matching its functions, ranges, leads, and safety limits to your work.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-a-small-parts-storage-cabinet/https://oldradiobuilder.com/blog/how-to-choose-a-small-parts-storage-cabinet/Choose a cabinet that protects, organizes, and keeps radio and electronics parts easy to find.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-a-soldering-practice-kit/https://oldradiobuilder.com/blog/how-to-choose-a-soldering-practice-kit/Choose a soldering practice kit by matching its parts, difficulty, tools, and learning goals to your electronics projects.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-choose-an-antistatic-work-mat/https://oldradiobuilder.com/blog/how-to-choose-an-antistatic-work-mat/Choose a work mat that fits your electronics, grounding setup, workspace, and care routine.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-clean-a-radio-cabinet-using-material-appropriate-care/https://oldradiobuilder.com/blog/how-to-clean-a-radio-cabinet-using-material-appropriate-care/Identify your radio’s cabinet material, choose a gentle cleaning method, and protect its finish, veneer, grille, and hardware.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-compare-am-and-fm-radio-reception/https://oldradiobuilder.com/blog/how-to-compare-am-and-fm-radio-reception/A practical bench-and-field method for comparing AM and FM reception, antennas, interference, and vintage radios fairly.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-compare-analog-and-digital-multimeters/https://oldradiobuilder.com/blog/how-to-compare-analog-and-digital-multimeters/Compare analog and digital multimeters by accuracy, input impedance, features, and safety, then choose the right tool for radio and low-voltage work.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-compare-portable-radios-for-listening/https://oldradiobuilder.com/blog/how-to-compare-portable-radios-for-listening/Compare portable radios by the stations you want, reception conditions, controls, power, and repairability with a repeatable listening checklist.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-compare-soldering-tip-shapes/https://oldradiobuilder.com/blog/how-to-compare-soldering-tip-shapes/Choose a soldering tip by matching its shape and size to the joint, access, and iron system.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-document-an-electronics-project-build/https://oldradiobuilder.com/blog/how-to-document-an-electronics-project-build/A practical system for recording radio and low-voltage builds, from parts and wiring to measurements, troubleshooting, and preservation.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-identify-a-radio-model-number/https://oldradiobuilder.com/blog/how-to-identify-a-radio-model-number/Find and interpret a radio’s model number using its labels, cabinet details, and reference records.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-label-parts-removed-from-a-radio-cabinet/https://oldradiobuilder.com/blog/how-to-label-parts-removed-from-a-radio-cabinet/A careful labeling system for documenting radio cabinet parts, fasteners, wiring, and finishes during restoration or repair.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-organize-a-project-parts-list/https://oldradiobuilder.com/blog/how-to-organize-a-project-parts-list/Build a clear, maintainable parts list for radio restorations and low-voltage projects, from first inventory to final bench check.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-organize-a-vintage-radio-collection/https://oldradiobuilder.com/blog/how-to-organize-a-vintage-radio-collection/Catalog, store, and care for vintage radios with a practical system for records, shelving, accessories, and safe low-voltage projects.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-organize-electronic-components-by-value/https://oldradiobuilder.com/blog/how-to-organize-electronic-components-by-value/Build a searchable component system that keeps resistors, capacitors, semiconductors, and vintage radio parts identifiable and ready to use.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-photograph-a-circuit-board-for-documentation/https://oldradiobuilder.com/blog/how-to-photograph-a-circuit-board-for-documentation/A practical guide to clear, repeatable circuit board photos for radio restoration, low-voltage projects, and workshop records.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-prepare-questions-for-a-qualified-vintage-radio-restorer/https://oldradiobuilder.com/blog/how-to-prepare-questions-for-a-qualified-vintage-radio-restorer/Organize a radio’s history, symptoms, and goals so a restorer can assess the work and explain safe next steps.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-read-a-radio-tuning-scale/https://oldradiobuilder.com/blog/how-to-read-a-radio-tuning-scale/Learn to interpret analog radio dials, estimate frequencies, and troubleshoot alignment without risking vintage equipment.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-read-a-simple-low-voltage-circuit-schematic/https://oldradiobuilder.com/blog/how-to-read-a-simple-low-voltage-circuit-schematic/Learn to trace power, identify symbols, follow connections and check a simple low-voltage radio project schematic safely.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-read-capacitor-value-markings/https://oldradiobuilder.com/blog/how-to-read-capacitor-value-markings/Decode capacitor values, units, tolerance, voltage, polarity, and common markings for radio repairs and low-voltage projects.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-read-resistor-color-bands/https://oldradiobuilder.com/blog/how-to-read-resistor-color-bands/Learn to decode four-, five-, and six-band resistors, check values with a multimeter, and avoid common identification mistakes.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/blog/how-to-store-precision-screwdrivers/https://oldradiobuilder.com/blog/how-to-store-precision-screwdrivers/Protect fine screwdriver tips, prevent rust, and keep the right driver easy to find at your radio and electronics workbench.Wed, 11 Nov 2026 00:00:00 GMTEducational Bloghow-tohttps://oldradiobuilder.com/statistics/am-radio-station-counts-statistics/https://oldradiobuilder.com/statistics/am-radio-station-counts-statistics/A source-based timeline of U.S. AM station counts from 1921 to 2018, with definitions and date limits explained.Wed, 11 Nov 2026 00:00:00 GMTStatisticsstatisticsAM radioradio historyFCCUnited Stateshttps://oldradiobuilder.com/statistics/public-radio-listening-statistics/https://oldradiobuilder.com/statistics/public-radio-listening-statistics/A source-based review of NPR, PRI, PRX, and public-radio listening measures, station reach, and audience estimates across reported periods.Wed, 11 Nov 2026 00:00:00 GMTStatisticsstatisticspublic radioNPRradio audienceshttps://oldradiobuilder.com/statistics/radio-listening-reach-statistics/https://oldradiobuilder.com/statistics/radio-listening-reach-statistics/A source-based overview of weekly radio reach across selected countries, UK age groups, broadcasters, audio types and listening platforms.Wed, 11 Nov 2026 00:00:00 GMTStatisticsstatisticsradio listeningaudience reachUK radioaudio survey