Hi. I need to figure out how to build a time delay circuit or where to buy them cheaply. I need one as i have an idea for a cheap airsoft grenade. the basic idea is some LED's in parallel connected to a 9volt battery as well as a small speaker. This is the connected to a simple switch which when activated waits 4 seconds the turns all the LED's on and emits a noise.( If possible i want this to turn off after a few seconds but it is not necessary) If it cant automatically turn off easily then they stay on until the switch is turned off.
The reason i want this is i want to make a grenade for airsoft that isnt explosive due to law in my country and so isnt dangerous. and isnt extremely expensive. I plan to place the circuit inside a ball of some kind so it can be thrown and isnt going to badly hurt anyone it lands on.
I plan to have approximately 10-15 LED's, speaker 9v battery. switch and the time delay. if this works i will have a cheaper grenade that is safe and works at night. Any help is greatly appreciated.
Just a note. This is not for school or anything so im not required to do this work myself. It is simply something i am thinking of doing.
The reason i want this is i want to make a grenade for airsoft that isnt explosive due to law in my country and so isnt dangerous. and isnt extremely expensive. I plan to place the circuit inside a ball of some kind so it can be thrown and isnt going to badly hurt anyone it lands on.
I plan to have approximately 10-15 LED's, speaker 9v battery. switch and the time delay. if this works i will have a cheaper grenade that is safe and works at night. Any help is greatly appreciated.
Just a note. This is not for school or anything so im not required to do this work myself. It is simply something i am thinking of doing.