# Audio Transformer Calculator — 3 in 1 transformer calculator > Transformer calculator for power and audio transformers in electronics projects. (iPhone/iPad app by Marko Delac.) - Source: https://appshunter.io/ios/app/audio-transformer-calculator/id1500812310 (this page in markdown: same URL + `.md`) - Developer: [Marko Delac](https://appshunter.io/developer/1500812309) - Category: Education, Productivity - Price: $11.99 - Rating: 3.80/5 from 5 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 9 MB - Languages: English - Released: 2020-02-29 - Data updated: 2026-07-07 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/audio-transformer-calculator/id1500812310/reviews.md ## What is Audio Transformer Calculator? Audio Transformer Calculator Professional 3-in-1 Transformer Design Tool for Tube Audio and Electronics Audio Transformer Calculator makes transformer design fast, accurate, and easy. Whether you're building a guitar amplifier, hi-fi tube amplifier, studio recording equipment, or a custom electronics project, this application helps you calculate proven transformer designs in seconds. Designed for both beginners and experienced transformer winders, the app combines powerful engineering calculations with an intuitive workflow that removes the guesswork from transformer design. THREE POWERFUL CALCULATORS IN ONE APP Power Transformer Calculator * Tube amplifier power supplies * Audio equipment * DIY electronics projects * Laboratory equipment * Custom power supplies Single-Ended (SE) Output Transformer Calculator * Guitar tube amplifiers * Hi-Fi amplifiers * Studio equipment * Custom audio projects * Ultra-Linear (UL) output transformers Push-Pull (PP) Output Transformer Calculator * Accurate push-pull output transformer calculations * Optimized core selection * Ultra-Linear (UL) transformer support SMART CORE AND BOBBIN WIZARD The built-in Core and Bobbin Wizard automatically finds the optimum core and bobbin size for your design. * Selects the ideal core size * Determines optimum bobbin dimensions * Calculates winding window utilization * Ensures windings and wire sizes fit correctly * Helps prevent costly design mistakes ADVANCED WINDING FEATURES * Tapped and continuous windings * Bias taps for power transformers * Universal speaker taps for SE and PP output transformers * Ultra-Linear (UL) taps for audio output transformers * Multi-secondary configurations METRIC AND IMPERIAL SUPPORT * Metric dimensions and wire sizes * Imperial dimensions and AWG wire sizes DETAILED DESIGN DATA * Core selection * Bobbin selection * Number of turns * Wire sizes * Layer calculations * Current ratings * Winding resistance estimates * Winding window utilization PERFECT FOR * Guitar amplifier builders * Hi-Fi enthusiasts * Audio engineers * Transformer winders * DIY electronics hobbyists * Tube amplifier restorers * Studio equipment designers * Students and educators WHY AUDIO TRANSFORMER CALCULATOR? * Three calculators in one application * Power Transformer Calculator * Single-Ended (SE) Output Transformer Calculator * Push-Pull (PP) Output Transformer Calculator * Ultra-Linear (UL) transformer support * Smart Core and Bobbin Wizard * Automatically verifies that windings fit the bobbin window * Supports tapped and continuous windings * Metric and Imperial units * Professional-grade calculations * Proven real-world transformer design methods * Suitable for beginners and professionals alike Whether you are winding your first transformer or designing professional audio equipment, Audio Transformer Calculator provides the tools you need to create accurate, reliable transformer designs with confidence. Design better transformers. Save time. Avoid costly mistakes. ## Key features - Calculate power transformers - Calculate audio transformers (push-pull, single-ended) - Supports tube amplifier builds - Handles E-I type cores - Calculates for vintage and modern amplifiers - Supports transformers with multiple taps ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/audio-transformer-calculator/id1500812310/reviews.md ### 1/5 — Doesn't work *2023-08-21* Hey, just trying to get your attention. Just purchased this app and it doesn't work. I'll fix the review if you can make it work again. ### 5/5 — Update *2022-07-12, version 1.3.1* Contacted the developer and he walked me through what was wrong and now everything is working perfectly! ### 4/5 — My own transformers *2021-10-04, version 1.3* I build tube amps. Decided I wanted to make my power and output transformers because sometimes I can’t find exactly what I need. I don’t know all the formulas to calculate everything I need to be able to build the transformers. This app makes it just too easy. It’s not perfect in respect to if you put some info then calculate and then you change some info and calculate again, sometimes the results are not fully updated but of you use the right info once, you get great results. So what I do is make sure to do things right once. If I want to change something, I just create a new transformer. I’m very hapy with the transformers I’ve built using the app. The power transformers voltages are dead on and work perfectly. The output transformers sounds as good, if not better than the best I’ve used from top brands. I believe that for the money, it’s a very, very effective tool. Not perfect as I explain but, if you are smart enough to experiment and see the behavior of the app, you’ll be able to have superb results. I’ve contact the developer of the app few times with questions and he responds fairly quick and always. I’m very pleased. Thanks. ## Frequently asked questions about Audio Transformer Calculator ### What types of transformers can DelatschTransformerCalculator calculate? DelatschTransformerCalculator can calculate both power transformers and audio transformers, including push-pull and single-ended types. It is particularly useful for transformers used in tube amplifier builds and other similar electronics DIY projects. ### What information do I need to input into DelatschTransformerCalculator? You need to specify basic parameters such as the required voltages and currents for power transformers, or the input and output impedances for output transformers. The calculator then uses this information to perform the calculations. ### Is DelatschTransformerCalculator suitable for vintage amplifier projects? Yes, the calculator is designed to compute any power and output transformer used in both vintage and modern guitar tube amplifiers, as well as other similar electronics DIY projects. ### Can DelatschTransformerCalculator handle transformers with multiple taps? Yes, it can be used for calculating line output transformers or output transformers that have as many taps as you wish. This flexibility makes it suitable for a wide range of custom designs. ### Does DelatschTransformerCalculator support different types of transformer cores? The app can calculate for any type of E-I type core, even if you are unsure about the specific flux density to use. This broad compatibility ensures it can be applied to various projects. ### What is the price of DelatschTransformerCalculator? DelatschTransformerCalculator is a paid application, priced at $11.99. This one-time purchase grants access to its full functionality for calculating transformers. ### How often is DelatschTransformerCalculator updated? The latest version, 1.4, was released on January 21, 2024. Updates typically address improvements and new features, ensuring the calculator remains relevant for users. ### What devices is DelatschTransformerCalculator available on? DelatschTransformerCalculator is available for iPhone and iPad devices. It is designed for users who need a convenient tool for transformer calculations on their Apple mobile devices. ## Version history (last 5 releases) ### 1.5.4 — 2026-06-23 Fixed the text that was not visible if phone was set to Dark mode. ### 1.5.3 — 2026-06-16 Description changed. ### 1.4 — 2024-01-21 Fixed compatibility issues with the latest iOS version. ### 1.3.1 — 2022-01-31 Fixed the bug in SE2 calculation where the app couldn't accept decimal value for direct current. Added the version for Mac OS. ### 1.3 — 2021-08-06 Fixed app crashing in imperial PP and SE calculator. Fixed recalculating the recommended core cross section for both metric and imperial. ## Apps similar to Audio Transformer Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [State Safe](https://appshunter.io/ios/app/state-safe/id1520018398) | 3.7 (3) | Free | Education | | [555 Timer & Oscillators Guide](https://appshunter.io/ios/app/555-timer-and-oscillators-guide/id6504487994) | — | Free | Education | | [Berwyn South School Dist 100](https://appshunter.io/ios/app/berwyn-south-school-dist-100/id6747272928) | 3.0 (1) | Free | Education | | [Mapping Tonal Harmony Pro](https://appshunter.io/ios/app/mapping-tonal-harmony-pro/id566767002) | 4.2 (64) | $14.99 | Education | | [AZ MVD Permit Practice Test](https://appshunter.io/ios/app/az-mvd-permit-practice-test/id6447557651) | 4.7 (51) | Free | Education | | [Arduino Programming Pro](https://appshunter.io/ios/app/arduino-programming-pro/id6447102673) | 4.6 (5) | $4.99 | Education | ## More apps by Marko Delac - [Delatsch Choke Calculator](https://appshunter.io/ios/app/delatsch-choke-calculator/id1521907575) All apps by Marko Delac: https://appshunter.io/developer/1500812309 ## Related topics [delatschtransformercalculator](https://appshunter.io/ios/topics/delatschtransformercalculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*