Introduction: "Timed Soundie" or "12 Second Sound Grenade"!

inspired by a combination of throwies, thinkgeek.com's "annoy-a-tron" and my recently discovered love for 555 timers, I've come up with this little guy. i call it the "timed soundie"

once the switch is flipped on the timed soundie, you have 12 seconds before it emits a nice loud and constant beeeeeeeeeeep, enough for me to hear throughout my whole house. on the underside of the soundie is a magnet, becuase throwing them to places people can't reach is fun!

note:
this instructable inspired in part by:
buzzer throwie
the original LED throwie

Step 1: The Nitty-gritty...

parts list:
10uF capacitor
2 3v button cells (cr2032)
1 M ohm resistor
piezo buzzer (about the width around of a 3v button battery)
555 timer
electrical tape
magnet

(this is my first time drawing a schematic, so tell me if its wrong!)

the legs of the 555 are bent out and the whole circuit wraps around the buzzer.

all of the parts are soldered or taped directly onto the 555 or the piezo buzzer. the wires soldered onto the circuit going to the batterys are just taped to the top and bottom of a stack of two button cell batterys. like a soundie sandwich, a battery is added and taped to the bottom. (this is optional, incase its just being used as a sound grenade to bother people or for use in an airsoft or paintball scrim)

NOTE: the buzzer's + should be connected to pin 3. the - is connected to pin 1.

Step 2: Throw It!

i've found these little guys do a suprisingly good job at sticking to things. you obviously can't chuck them like you would a throwie, but a nice loft will generally land you a stick. just be sure to flip the switch before you toss it ;-)

(if just being used as a sound grenade, be sure to pad the little guy; he's probably fragile!)

thanks for visiting my first instructable, and please visit my website: lioorg.com

Comments

author
techno guy (author)2012-08-15

is there an equation that can give the values of the capacitor and resistor for a given amount of delay, or visa versa

author
SquigyXD (author)techno guy2015-09-21

I know this is an old thread and comments, just stumbled across it and had some knowledge to share.

t = 1.1*R*C seconds

where R and C are the resistor and capacitor

eg.

if we choose R = 10Kohms and C = 470uF

t = 1.1*10000*0.00047

t = 5.17 sec

found here: https://www.instructables.com/id/555-Timer/

author
lxavier2 (author)2014-06-14

I have a question I'm new to electronics but would like to know what capacitor is it all I can find is 10uf can you please tell me :) :) :D

author
icewolf (author)2010-02-26

 Mod this thing to fit a 9v battery, then throw it behind a big heavy closet.
Now wait for it to discharge completely !!!


Nice instructable!

author
icewolf (author)icewolf2010-02-26

 or add a CDS cell so everytime someone looks for it with a flashlight , it stops working  LOL

author
pokemech (author)icewolf2013-12-12

Easy there Satan...

author
biboNL (author)2010-02-17

ok, so my nearby DIY store sells either 4.7 Mohm or 240 Kohm resistors, and no 1Mohm resistors.
should i just slap a few 240 Kohm resitors behind eachother or should i go for a 4.7Mohm resistor?

author
techxpert (author)biboNL2012-02-04

go for the 4.7 MOhms 5min get a way time LOL :)

author
Johnny C. (author)2009-11-11

I build one too!
But mine starts after 8 secs!

Webcam1^1.bmp
author
techxpert (author)Johnny C.2012-02-04

use a bigger resistor like 1.3MOhms :)

author
Johnny C. (author)Johnny C.2009-11-12

And i made a new schematic. Here are the positive and negative parts marked!

soundie.jpg
author
techno guy (author)2011-02-16

Mine doesnt work. It only works when you disconnect the wire from the piezo and reconnect it.

author
techxpert (author)techno guy2012-02-04

when you reconnect it does it go the whole way of just when your reconnecting it try putting a resistor in front and behind the pizzo

author
PhilipK73 (author)2011-01-30

This is a great guide and my first look into 555 timers (and electronics in general). I have a question though, how would you make it go off in 3~ seconds and then turn off after buzzing for 5~ seconds? I plan on using this for a "sound grenade" and use the IntrudAlert Alarm ($1 at local store).

To make it go off quicker, I would assume you would use a smaller capacitor (maybe 5uF?) but how would you make it stop?

author
jhakker (author)2011-01-29

Anybody know of a good website to buy these parts cheap

author
tesla coil (author)2009-01-04

Could you use a 1K Resistor ??

author

no, not enough resistance. maybe with a bigger capacitor, but a 1K resistor would make the 555's output go to high immediately

author
amando96 (author)let_it_out_org2009-01-30

what if you use 720M farads? lol an hour timer? :P

author
doom8666 (author)amando962010-02-17

No such thing as a MFarad, plus a farad alone is huge, VERY huge

author
a_d777 (author)doom86662010-11-10

Its so huge, you can run this circuit for about 20 minutes on it!!

author
doom8666 (author)doom86662010-02-17

also i mean Mega, unless u meant micro with that m

author
amando96 (author)doom86662010-02-17

 indeed meant micro :)

author

I will have to try that.

author
amando96 (author)2010-08-24

Actually it's µ.

author
sci4me (author)2010-06-06

would an electrolitic capacitor work???

author
broken_to_fix (author)2010-03-02

 wats that thing that says lioorg?

author
nadav (author)broken_to_fix2010-03-04

 an add for his site...

author
Articas (author)2010-02-13

could you attach the flash circut fron a camera to make a timed flash grenade

author
matstermind (author)2009-09-10

my timer just heats up

author
slinger14 (author)matstermind2010-01-24

check your wiring you might have created a short some where. also check to make sure u didn't hook it up backwards since the diagram on here doesn't have polarity symbols on the battery

author
bigstiffy (author)2009-10-26

How do you have the button cells hooked up?

author
geeklord (author)2009-01-02

WOO!, first to comment! Awesome, might have to try this on an Algebra teacher >:-)

author
Colonel88 (author)geeklord2009-10-07

Noone likes someone who is happy to be the first one to comment.

author
revhead (author)2009-03-18

i made this exactly as outlined by the schematic and it didnt work, why? are the pins 4,5,7 not used, or do they go to ground? any help would be great, cheers!!

author
Colonel88 (author)revhead2009-10-07

4 is for RESET, which means that it will reset the circuit when voltage is applied. Here, you time it only ONCE, the "12 seconds"

author
let_it_out_org (author)revhead2009-03-18

4, 5, and 7 should not be connected to anything. be sure you're using a buzer and not a piezo element. if you apply voltage to your piezo (touch both contacts to a button cell) it will beep. it should have a + and -...something i guess i forgot to mention is that the + should be connected to the 3rd pin.

author
dcmania21 (author)let_it_out_org2009-06-02

I think i bought a piezo element, how do i use that in circuits?

author
Colonel88 (author)dcmania212009-10-01

Piezo element u need to hook it up to a timer, which is the job of the 555. So really, forget about making something from a piezo u could make a REALLY REALLY annoying thing though from it.

author
revhead (author)let_it_out_org2009-03-18

thanks. the problem that I am having is that as soon as I connect my power supply to the circuit, there is no delay in the buzzer sounding. it just starts to beep as soon as the power is put to the circuit. could this be a problem with the capacitor. the capacitor that I am using is a 10uF 35V tantalum capacitor. i am also using a 1M Ohm resistor like you suggested. Thanks for helping me out. Cheers.

author
dlcoates1 (author)2009-10-03

Here is a better schematic for this instructable that I made for you.

12 Second Sound Grenade Schematics.jpg
author
Colonel88 (author)2009-10-01

Great idea now i know how to set up a 555 to time it.

author
olvegrn (author)2009-09-28

probably a dumb question
How do you get the timer to go longer on it? I don't want it to start for about 20 minutes.... I am planting this thing in my buddies car and when he is on his way home he will go insane!

Thanks!

author
Colonel88 (author)olvegrn2009-10-01

You could try using a HUGE capacitor. The larger the capacitor/resistor the longer it will take to fill up the capacitor and thel onger it will take it to set it off.

author
spacewarp (author)2009-08-29

will it work with electrolytic capacitor? :S

author
Jmmaroli (author)2009-08-20

Cool. I built one with an adjustable timer and a car alarm, very, very loud.

author
conrad2468 (author)2009-07-06

V-removed by author request.....I built one! It is sweet! Unfortunately i had to mount the buzzer on the outside because its too big!

Photo 1.jpg
author

oh i love those buzzers...so annoying

author
Madrias357 (author)2009-06-01

Stuck one of these in a friend's trash can with a push-on switch built in. Also used a lower-rated buzzer than I needed (hey, it was louder) and scared the heck out of him. Didn't expect his metal trash can to suddenly sound up with a loud buzz.

author
imakethings (author)2009-05-01

Can 555 timers be used to increase voltage in a circuit? can someone post an instructable regarding this?

author
Sandisk1duo (author)imakethings2009-05-31

look up 'joule thief'

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