Instructables

Mosquito repellent

Picture of Mosquito repellent
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The summer this year is too hot, the heat is not really a problem but mosquitoes ...! ,especially i camping.

So after i tried some solutions i got the idea to make an electronic mosquito repellent that i can take with me wherever i go. this circuit is just a transistor multivibrator that generates high frequency sound ,and mosquitoes don't like this sound.

I am not gonna use a PCB i will just solder components together to make it a simple and cheap

 
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Step 1: Components

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  1. two BC548 transistors or equivalent
  2. two 100k resistors radio shack link
  3. two 1.5k resistors radio shack link
  4. one 4.7k resistor radio shack link
  5. one 2nF ceramic capacitor radio shack link
  6. one 560pF capacitor radio shack link
  7. 5mm Red led radio shack link
  8. Toggle switch radio shack link
  9. 9v battery radio shack link
  10. 9v battery snap connector radio shack link
  11. Piezo element radio shack link
  12. a small project enclosure radio shack link
  13. some wire

This components i salvaged them from my older projects ,but i put links to Radio Sack

Step 2: Tools

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  1. Cutting plier
  2. Needle nose plier
  3. Solder iron
  4. Some solder
  5. Philips screwdriver
  6. Hot or super glue

Step 3: Circuit soldring

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solder the components in order like in the pictures

  1. Bend the collector and base pin of each transistor
  2. Solder the emitter pins together
  3. Solder the 560 capacitor then 2nf one solder the two 100k resistances then the other 1.5k
  4. bend the free pins of 4 resistance and so

Step 4: Preparation

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  1. Make a hole for the toggle switch with the soldering iron then enlarge with the screwdriver
  2. Screw the switch in place
  1. Solder the 4.7 resistor to the positive pin of the led
  2. Make a side hole on the box with the soldering iron for the led
  3. Solder the led current limiting resistance to one one switch pin
  1. Solder two wires to the Piezo element ,positive pin is the middle disk
  2. Make a small hole on the lop next to the switch for the Piezo element wires
  3. Insert the wires in the hole and glue the Piezo element to the top
  1. Solder the red wire of the snap connector to the other pin of the toggle switch
  2. Solder the black wire to the negative pin of the LED
stubbsonic10 days ago

I'm like flavor-blasted Doritos to mosquitos. They bite me once, then they go find all their friends and come back for more. And DEET really is the only thing that works for me.

Have you tried your high-frequency device "in the field"?

I'm skeptical as to how well it will work in more intense circumstances.

amgworkshop (author)  stubbsonic4 days ago

yes i thinks it's working .but i can't stand those ultrasonics.

maybe i will increase the frequency or lower the operating voltage

there are all sorts of pest control devices using ultrasonic frequencies. like the above poster, unsure of how well it would work in this case.
Bashey7 days ago

Is it a 2nf or a 2.2 nf capacitor? 'cause i can't find some 2.2nf capacitors in my favorite electronic store.

Does operate on diferent voltages too?

And can i use some ultrasonic transmitter either (instead of the Piezo speakers)

very nice Project by the way! :)

amgworkshop (author)  Bashey4 days ago

it's 2nf ,yes it does operate on different voltage from 1.5v to the max voltage of the piezo buzzer and the transistors . i think you can use an ultrasonic transducer if that's what you mean.

thanks Bashey

Aleator7779 days ago

Now to deploy these in swamps everywhere! Mosquitos be-gone!

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