Home Projects Oscillators and timers 1 to 100 Seconds Timer



1 to 100 Seconds Timer
author: Rajkumar Sharma


This project is a 1 to 100 Seconds Timer based on 555 IC


This project is a timer project and build around popular 555 Timer IC, It can be used for all application required a delay of up to 100 Seconds. Onboard board preset to adjust the required timer duration in range of   of 1 to 100 Seconds, Tact switch SW1 to reset the timer and SW2 to start the timer. LED D3 works as power indicator and LED D2 to indicate timer operation.

Load can be connected to CN1 Screw Terminal, Out-put has both the operation normally Open and normally closed. Circuits works on 12V DC and consume approx. 100mA current. Very useful project can be used in various applications like water irrigation system, Kitchen timer etc.

Supply input 12 VDC @ 100 mA  
Onboard start and reset tactile switch  
Relay output: SPDT relay  
Relay specification: 5 A @ 250 VAC  
Relay state LED indicator  
Preset adjustable range function  
Power-On LED indicator  
Screw terminal connector for easy relay output connection  
Four mounting holes of 3.2 mm each  
PCB dimensions 48 mm x 63 mm



 PCB Design - Parts List


PCB bottom layer



120x90 spot



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