This simple timer makes the output LED “on” for some time and then goes “off”. The chip NE555 (or equivalent) is off the shelf available and is low cost.
- IC 555 is connected in monostable mode as shown in the diagram.
- You can set the timing by setting the potentiometer (100k) value.
- To start the timer, press and release the push button. (The button is “push to ON” type.
- When the timer starts, the output LED glows. It glows for the set amount of time and then is OFF.
- You can calibrate the potentiometer knob to set time properly.
- Maximum time for which the LED glows is approximately 16 seconds.
- Minimum time for LED glowing is approximately 1 sec.
|4||Potentiometer||100k,16mm, plastic shaft||1|
|7||IC socket||8 pin,DIL||1|
|8||Battery||9V, flat, non-rechargeable||1|
|9||PCB||general purpose, 4″X4″||1|
|11||Misc||wires, solder metal|
This project is available in the kit form. Contact Omkar to buy it. This site has no commercial connection with his activities.