Timer IC 555 Calculator

Calculation of astable and monostable circuit

Peter Ho · com.peterhohsy.timer555calculator

Not rated yet 100K+ downloads v4.0.30 8.5 MB Android 6.0+ PEGI 3 · Everyone

Download APK 8.5 MB All versions

Signature matches the Google Play version Details

Watch the Timer IC 555 Calculator trailer on YouTube

At a glance

Latest version: v4.0.30 (4030)
Updated: Sep 3, 2026 (1 month ago)
APK size: 8.5 MB
Requires: Android 6.0+ (API 23)
CPU support: x86 32-bit, x86 64-bit, ARM 32-bit, ARM 64-bit
Category: Tools (app)
Listed since: Apr 7, 2021 (at least)
Permissions: 5
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Timer IC 555 Calculator is an app by Peter Ho in the Tools category, listed since at least April 2021. It includes native code for x86 32-bit, x86 64-bit, ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 3.4.70, the minimum Android version rose from 5.0 to 6.0. It asks for 5 permissions, none of them sensitive. It asks for the same permissions as version 4.0.25. The app offers in-app purchases through Google Play.

What's new in v4.0.30

4.0.30 - Fix minor bugs

Description

From the listing uploaded by “appupdater”.

IC 555 is a basic timer IC for hobbyist or electronic engineers. This app is used to calculate monostable and astable circuit Features: 1. Calculate monostable circuit 2. Calculate frequency of astable circuit 3. Calculate component values of monostable and astable circuit. Save component values in CSV file (Excel file) Features in PRO version only: 1. Selectable preferred value of resistors and capacitors 2. Share CSV file to other apps 3. No limitation 4. No Ad Note : For those who need support please email to the designated email. Do NOT use either the feedback area to write questions, it is not appropriate and that is not guaranteed that can read them.

Version history

6 versions are listed, going back to v3.4.70. Since v4.0.20 it requires Android 6.0+.

v4.0.30 LATEST Sep 3, 2026 8.5 MB TRUSTED v4.0.25 Aug 21, 2026 8.5 MB TRUSTED v4.0.20 Jul 28, 2026 8.5 MB TRUSTED v4.0.15 Mar 23, 2026 5 MB TRUSTED v4.0.05 Aug 4, 2026 5 MB TRUSTED

All 6 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Sep 3, 2026.
Certificate issued to “Peter Ho” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Sep 3, 2026
Validated against Google Play Sep 3, 2026
Signed byCN=Peter Ho
Signing certificate (SHA-1)41:02:A5:4E:EF:CC:4A:31:97:6A:CF:74:8A:ED:A1:D6:58:A7:02:DC
File MD5963f7dc920f9011ad924e3ad41f95450
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (5)

Timer IC 555 Calculator requests 5 permissions, none of them sensitive.

Full network access android.permission.INTERNET
Google Play license check com.android.vending.CHECK_LICENSE
In-app purchases (Google Play Billing) com.android.vending.BILLING
Internal broadcast protection (app-defined) com.peterhohsy.timer555calculator.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch

Timer IC 555 Calculator APK: questions and answers

Is there a version of Timer IC 555 Calculator for older Android phones?

The current version needs Android 6.0 or later. Version 4.0.15 is the newest listed build that installs on Android 5.1 and later. Get version 4.0.15 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is Timer IC 555 Calculator free?

The APK is free to download, but the app offers in-app purchases through Google Play.

Is the Timer IC 555 Calculator APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 963f7dc920f9011ad924e3ad41f95450.