Fake Water Drops
by Vladmakesstuff in Living > Pranks, Tricks, & Humor
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Fake Water Drops
This is a nice prank to play on your angry friends , because it will really annoy them .
What does it do ? Well , it generates a sound similar to the sound that a water drop makes when it's dropped in a bucket or any other plastic object.
You can adjust the frequency of the drops by rotating a variable resistor , and it works with voltages between 6v and 3v .
What does it do ? Well , it generates a sound similar to the sound that a water drop makes when it's dropped in a bucket or any other plastic object.
You can adjust the frequency of the drops by rotating a variable resistor , and it works with voltages between 6v and 3v .
Parts
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The way it works is very easy , it uses 2 switching transistors , 1 PNP and 1 NPN , a capacitor , a resistor and a speaker.
So , what you need is :
--1 General Purpose NPN Transistor (prefferably 2N3904)
--1 General Purpose PNP Transistor (prefferably 2N3906)
--1 10 Microfarad Electrolytic Capacitor
--1 Speaker
--1 Battery holder
--1 Variable resistor (100 K ohm)
--Some Wires
--Your favorite soldering tool
So , what you need is :
--1 General Purpose NPN Transistor (prefferably 2N3904)
--1 General Purpose PNP Transistor (prefferably 2N3906)
--1 10 Microfarad Electrolytic Capacitor
--1 Speaker
--1 Battery holder
--1 Variable resistor (100 K ohm)
--Some Wires
--Your favorite soldering tool
Building It
It takes aprox. 30 min to build it depending on how do you want it done ( breadboard , perfboard , no board , etc)
Follow the scheme included in this step to see how to make the device.
You can also use a 100K fixed value resistor for the circuit , but it won't work with all voltages.If you use a variable one , you can adjust it to work with the voltage that you're feeding the circuit with.
Follow the scheme included in this step to see how to make the device.
You can also use a 100K fixed value resistor for the circuit , but it won't work with all voltages.If you use a variable one , you can adjust it to work with the voltage that you're feeding the circuit with.
Finishing It
After building it you may want to put it in a case,but remember , you want to hide this somewhere so people won't see it , this means that you can use any ugly case that you find around your house.I did this , and i used a VERY old box from an electronic door bell-ish thing, which actually had a working 10 ohm speaker in it , which makes a really loud sound which gives you headakes.
So, get a box and put everything together.(Notice my ugly box?)
As you can see in the photos , i used a 9V battery clip for the power source because i had 2 battery holders with the same connections .(1 was giving 3V and the other 6V)
So, get a box and put everything together.(Notice my ugly box?)
As you can see in the photos , i used a 9V battery clip for the power source because i had 2 battery holders with the same connections .(1 was giving 3V and the other 6V)