# DIY Metal Detector (Au,Ag,Fe) — with Discrimination

> DIY metal detector schematics and iPhone integration for metal detection. (iPhone/iPad app by Dmitriy Kharutskiy.)

- Source: https://appshunter.io/ios/app/diy-metal-detector-auagfe/id1404284012 (this page in markdown: same URL + `.md`)
- Developer: [Dmitriy Kharutskiy](https://appshunter.io/developer/817385891)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Rating: 3.80/5 from 27 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 24 MB
- Languages: Dutch, German (Germany), Russian, Swedish, Mexican Spanish, American English, Italian, Japanese, Czech, Brazilian Portuguese and 1 more
- Released: 2018-08-04
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/diy-metal-detector-auagfe/id1404284012/reviews.md

## What is DIY Metal Detector (Au,Ag,Fe)?

The application is designed to connect the simple circuits of a metal detector to an iPhone through the phone’s headphone jack. The schematics of homemade metal detectors are EXTREMELY SIMPLE and can be made by anyone, even by someone who's never held a soldering iron. Metal detectors can detect ferrous and non-ferrous metals (including gold and silver) and are able to distinguish between them (with discrimination). A positive number means it's a ferrous metal, while a negative number means non-ferrous. The numbers shown on the screen are NOT "Target ID" or VDI, like they are on brand metal detectors. The first scheme (WITHOUT CHIP) is named "Very simple" metal detector (MD1), and the second is "Sensitive" metal detector (MD2).

THE "VERY SIMPLE" METAL DETECTOR IS PERHAPS THE SIMPLEST SCHEME OF AN ACTUAL, WORKING METAL DETECTOR, FOR IT ONLY CONSISTS OF AN LC CIRCUIT AND TWO RESISTORS IF YOU DON'T COUNT IN THE IPHONE :).

The main part of the device is the LC circuit. The stability of its parameters is very important. They constantly fluctuate with the slightest changes in temperature. Moreover, the inductance changes with the slightest changes in the geometry of the inductance coil. These changes are constantly being adjusted by the application. The parameters of the internal iPhone circuits and the headphone jack adapter can also fluctuate, but they stabilize after approximately 2-3 minutes after turning on the signal (therefore, the metal detector must work continuously during the search).  

Frequency range is 3-14 kHz. It is possible to choose the frequency by choosing the capacity of the condenser in the LC circuit. After a change in capacity or inductance, on the first start, or when a change in air temperature occurs (for example, when you went outside), you need to enable the search for the resonance frequency.

Searching using a metal detector isn't as easy as it might seem and might sometimes be deadly. Therefore, it is necessary to study this subject on specialized sites. Be sure to do some experiments with a coin placed on the ground.

FREE VERSIONS OF METAL DETECTORS ARE LIMITED BY THRESHOLD OF THE SOUND SIGNAL AND THE INDICATOR LIGHT. WHICH MEANS THAT IT'S POSSIBLE TO DETECT THE METAL BY THE NUMBERS (THE FONT SIZE OF WHICH IS REDUCED) ON THE IPHONE'S SCREEN, BUT IT CANNOT BE HEARD OR SEEN IN PERIPHERAL VISION IF NOT LOOKING DIRECTLY AT THE SCREEN.

"Very simple" metal detector (WITHOUT CHIP):
• Coin: 4 inches (10 cm)
• Small shovel: 6 1/2 inches (16 cm)
• Discriminate between metals

"Sensitive" metal detector:
• Coin: 6 1/2 inches (16 cm)
• Small shovel: 9 inches (23 cm)
• Discriminate between metals

## Key features

- Connects to DIY metal detector circuits
- Detects ferrous and non-ferrous metals
- Discrimination between metal types
- Simple circuit schematics included
- Adjusts for temperature and coil changes
- Frequency range 3-14 kHz

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| The sensitivity of MD1 | $1.99 | one-time |
| The sensitivity of MD2 | $1.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/diy-metal-detector-auagfe/id1404284012/reviews.md

### 2/5 — よく分からない…

*2022-10-04*

スマホのマイク部分を擦ると反応するんだけど？

### 5/5 — 面白い

*2019-02-18*

スマホの磁気センサーを使えば簡単に使用できる所を
わざわざ磁気センサーから手作りしてやろうという
考え方に、惚れた。部品揃えて制作してみたい。

## Frequently asked questions about DIY Metal Detector (Au,Ag,Fe)

### What is the DIY Metal Detector app?

The DIY Metal Detector app connects simple, homemade metal detector circuits to your iPhone through the headphone jack. It helps you build and use a detector to find various metals.

### Can DIY Metal Detector find gold and silver?

Yes, the app is designed to detect both ferrous and non-ferrous metals, which includes gold and silver. It also offers basic discrimination to distinguish between different metal types.

### How accurate is the DIY Metal Detector app?

The app helps stabilize circuit parameters that can fluctuate due to temperature or coil changes. However, the numbers shown are not 'Target ID' like professional detectors, and accuracy depends on the DIY circuit's quality.

### What are the detection ranges for the 'Very simple' detector?

With the 'Very simple' detector, you can detect a coin up to 4 inches (10 cm) away and a small shovel up to 6 1/2 inches (16 cm) away.

### What are the detection ranges for the 'Sensitive' detector?

The 'Sensitive' detector offers greater range, detecting a coin up to 6 1/2 inches (16 cm) and a small shovel up to 9 inches (23 cm) away.

### Does DIY Metal Detector have ads?

No, the DIY Metal Detector app does not contain advertisements.

### What devices is DIY Metal Detector compatible with?

The app is designed for iPhones and iPods. It requires a headphone jack for connection to the DIY metal detector circuit.

### How often is DIY Metal Detector updated?

The app was last updated on February 13, 2026, indicating ongoing development and support for the application.

## Version history (last 5 releases)

### 1.2.12 — 2026-02-13

• Bug fixes.

### 1.2.11 — 2025-10-31

• Minor changes in text design.

### 1.2.10 — 2025-04-30

• Minor changes in text design.

### 1.2.9 — 2025-04-09

• Fixed a bug that appears if the app is running on iOS 18.

### 1.2.8 — 2023-10-08

• Minor changes in text design.

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## More apps by Dmitriy Kharutskiy

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All apps by Dmitriy Kharutskiy: https://appshunter.io/developer/817385891

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*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 2026-08-24.*