About Timer IC 555
The 555 is an industrial standard timer IC, this app calculates about it. FEATURES - Can limit the values of resistors/capacitor to E3/E6/E12/E24 series. - Simple waveform which will be output. - Calculating the freque
The 555 is an industrial standard timer IC, this app calculates about it.
FEATURES
- Can limit the values of resistors/capacitor to E3/E6/E12/E24 series.
- Simple waveform which will be output.
- Calculating the frequency and duty cycle from resistors/capacitor.
- Reverse calculating the values of resistors/capacitor from frequency and duty cycle. And list up recommended parts.
- Supported operation is only Astable.
HOW TO USE #1
(1) Please input the values of resistor Ra, Rb and capacitor C.
(2) A frequency, duty cycle, and waveform are output.
HOW TO USE #2
(1) Please input the frequency and duty cycle.
(2) A list of recommended parts (resistor Ra, Rb and capacitor C) is output.
(3) Can use one of the list as the input of 'HOW TO USE #1', and can calcurate it again.
Previous Versions
Here you can find the changelog of Timer IC 555 since it was posted on our website on 2021-12-14 14:44:14.
The latest version is 2.5 and it was updated on 2026-06-11 03:33:51. See below the changes in each version.
Timer IC 555 version 2.5
Updated At: 2025-07-26
Changes: v2.5
- Added an option which sounds a result square wave.
- Updated the target API level to Android 15 by Google order.
- Fixed a bug that the previous wave is restored when rotated the screen.
Timer IC 555 version 2.4
Updated At: 2025-02-18
Changes: v2.4
- Supported also Android 15.
- Fixed a bug not start in earlier than Android 8.0.
Timer IC 555 version 1.1
Updated At: 2017-06-15
Changes: v1.1
- Added custom 10 keypad.
Because the decimal point button may be far on some software keyboards.
- Enabled all operations by only physical full keyboard.
Disclaimer
Official Google Play Link
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