LC meter (DIY project)
7.4 14
v2.19 by NECO
About LC meter
LC meter (Package Name: com.neco.desarrollo.resonancefinder) is developed by NECO and the latest version of LC meter (DIY project) 2.19 was updated on November 8, 2026. LC meter (DIY project) is in the category of Tools. You can check all apps from the developer of LC meter (DIY project). Currently this app is for free. This app can be downloaded on Android 7.0+ on APKFab or Google Play. All APK/XAPK files on APKFab.com are original and 100% safe with fast download.
Turn your phone into an LC meter
Measure inductance, capacitance and resonance frequency with a small homemade circuit and your smartphone. No cables: the app listens to the circuit through the microphone.
How it works
The circuit makes the part you are measuring oscillate together with a known reference part, and a small buzzer plays that resonance as a steady tone. The app finds the tone's frequency and calculates the inductance or capacitance.
How to measure
1. Connect the coil or capacitor to the circuit and set its switch to L or C.
2. Place your phone near the buzzer.
3. Choose L mode or C mode in the app and press Start.
4. Read the frequency and the measured value on the screen.
Features
• Measures inductance (L) and capacitance (C)
• Shows the resonance frequency and the live signal waveform
• Results in nH, µH, mH, H, nF and µF
• Reference values you can set for best accuracy
• Works in a quiet room, no wires to the phone
• English, Spanish and Russian
Measuring range
With the standard reference parts:
• Inductance: about 100 µH to 100 mH
• Capacitance: about 10 nF to 10 µF
Change the reference capacitor or coil on the board to measure other ranges.
Parts you need
• C1, C2, C3, C4: 470 nF polyester capacitors
• L1: 10 mH coil
• Q1, Q2: BC557 transistors
• Q3: BC547 transistor
• R1: 10 kΩ, R2: 100 Ω, R3: 220 kΩ, R4: 5.1 kΩ
• 3-pin switch
• Passive piezo buzzer
• 3.5 to 5 V power supply
A cheap and easy project for electronics hobbyists, radio amateurs and students.
Step-by-step guide
The schematic, PCB files, build video and full instructions are on my web page:
neco-desarrollo.es/resonance-finder
The app is free with ads. Upgrade to Pro once to remove all ads.
Measure inductance, capacitance and resonance frequency with a small homemade circuit and your smartphone. No cables: the app listens to the circuit through the microphone.
How it works
The circuit makes the part you are measuring oscillate together with a known reference part, and a small buzzer plays that resonance as a steady tone. The app finds the tone's frequency and calculates the inductance or capacitance.
How to measure
1. Connect the coil or capacitor to the circuit and set its switch to L or C.
2. Place your phone near the buzzer.
3. Choose L mode or C mode in the app and press Start.
4. Read the frequency and the measured value on the screen.
Features
• Measures inductance (L) and capacitance (C)
• Shows the resonance frequency and the live signal waveform
• Results in nH, µH, mH, H, nF and µF
• Reference values you can set for best accuracy
• Works in a quiet room, no wires to the phone
• English, Spanish and Russian
Measuring range
With the standard reference parts:
• Inductance: about 100 µH to 100 mH
• Capacitance: about 10 nF to 10 µF
Change the reference capacitor or coil on the board to measure other ranges.
Parts you need
• C1, C2, C3, C4: 470 nF polyester capacitors
• L1: 10 mH coil
• Q1, Q2: BC557 transistors
• Q3: BC547 transistor
• R1: 10 kΩ, R2: 100 Ω, R3: 220 kΩ, R4: 5.1 kΩ
• 3-pin switch
• Passive piezo buzzer
• 3.5 to 5 V power supply
A cheap and easy project for electronics hobbyists, radio amateurs and students.
Step-by-step guide
The schematic, PCB files, build video and full instructions are on my web page:
neco-desarrollo.es/resonance-finder
The app is free with ads. Upgrade to Pro once to remove all ads.
LC meter 2.19 Update
• New design: clearer screen with large readings and a live signal waveform• Fixed a crash when the reference value was left empty
• Reference values now accept a comma or a dot as the decimal separator
• Shows the real frequency step (FS)
• Units now shown as µF and µH
• Support for Android 16
• Updated Google Play billing for the Pro version
Read More
LC meter Features
Related Videos
Previous Versions
More
Requires Android: Android 7.0+
Screen DPI: 160-640dpi
SHA1: b6291a8e71fed2c163b34138f4aa2dab23c17928
Size: 3.82 MB
What's New:
• New design: clearer screen with large readings and a live signal waveform
• Fixed a crash when the reference value was left empty
• Reference values now accept a comma or a dot as the decimal separator
• Shows the real frequency step (FS)
• Units now shown as µF and µH
• Support for Android 16
• Updated Google Play billing for the Pro version
• Fixed a crash when the reference value was left empty
• Reference values now accept a comma or a dot as the decimal separator
• Shows the real frequency step (FS)
• Units now shown as µF and µH
• Support for Android 16
• Updated Google Play billing for the Pro version
Requires Android: Android 5.0+
Screen DPI: 160-640dpi
SHA1: c81f1a38a7aeb6f35045909fa3901e0534245498
Size: 19.22 MB
What's New:
Bugs fixed
Requires Android: Android 4.4+
Screen DPI: 160-640dpi
SHA1: 01614d6cc4c3ee7781345a1a95759d15263f8082
Size: 8.16 MB
What's New:
Bugs fixed
Requires Android: Android 4.4+
Screen DPI: 160-640dpi
SHA1: e48a539b996d1403ec3935f7e307d8399cac4325
Size: 7.33 MB
What's New:
Bugs fixed
More Information
Package Name:
Update Date:
2026-11-08
Latest Version:
2.19
Need Update:
Available on:
Requirements:
Android 7.0+
Report:
Safe to Download
APKFab.com and the download link of this app are 100% safe. All download links of apps listed on APKFab.com are from Google Play Store or submitted by users. For the app from Google Play Store, APKFab.com won't modify it in any way. For the app submitted by users, APKFab.com will verify its APK signature safety before release it on our website.