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Timer IC 555

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The 555 is an industrial standard timer IC, this app calculates about it.

Rating
4.0
146 ratings
Downloads
29.9K+
on Google Play
Price
Free
No in-app purchases
Updated
Jul 26
2025 · v2.5
Get it onGoogle Play See alternatives

Screenshots

  • Timer IC 555 screenshot 1
  • Timer IC 555 screenshot 2
  • Timer IC 555 screenshot 3
  • Timer IC 555 screenshot 4

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 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.

What’s new

Version 2.5 · Updated July 26, 2025

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.

User reviews

A Google user
A Google user
Very useful and precise
Rajkumar Saini
Rajkumar Saini
Good
Alireza Heidaryan
Alireza Heidaryan
Ok
A Google user
A Google user
Its easy to use ..very good

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