Hey gang welcome back in today’s video I’m going to show you how to make a very simple and compact infrared detection device that can be used to sweep over a room to look for hidden night-vision cameras or to detect any other source of infrared radiation including testing infrared remote controls over here we have a night-vision keychain camera with.
Motion detection and we have a wireless camera.
Here these can be purchased with infrared illuminators but.
One here does not have any depending on the type of infrared illuminators that are used in these devices you may.
Only see a faint red glow at night or if a 940 nanometer LED is used you won’t see anything at all and that’s when this device would come in extremely handy ok let me show you what you’re going to need to make this device now in order to make this device you’re going to need everything you see right here and I will post a link in the video description area to make it easier for you to find components to use for this project 9 volt battery 9 volt batteries.
Snap a small plastic project box you can see mine already has the holes cut into it the on and off switch is going to be this rocker switch I pulled this out of some scrapped electronics as well as the potentiometer all that’s required is a simple.
Single pole single throw over here is a piezo alarm or piezo buzzer inside this component.
Is a drive circuit used to create oscillations and those oscillations are would cause that piezo element to vibrate and create a sound.
For the potentiometer over here which is going to adjust the sensitivity you’re going to need a knob to go on top of it over here an extremely high gain NPN transistor it’s an mps 4 5 w a and.
It’s used in another video of mine for a radiation Tector actually an ionization chamber it’s a very cool circuit if you haven’t.
Seen it after this video you can click on the circle with the eye right here you’ll see the drop down menu or you can wait.
For the very end of this video and you’ll see that video displayed in addition to the transistor you’re going to need a power indicating LED this is a clear green you can use a.
Green one a blue one a red one whichever color you want just to let you know that the circuit is active and in addition to the power indicating LED you’re going to want to use around a four point seven K to a seven point five K resistor which is going to limit the current through the LED to light up that LED at a very low current which will also conserve battery power now the part that’s going to be detecting the infrared is right over here it’s nothing more than an.
Infrared photo transistor and.
You can see some infrared photo transistors will come with a clear epoxy and some come with this dark smoked and the advantage of.
Using this dark one is it greatly decreases sensitivity to visible light while still allowing infrared light to trigger the circuit now I’m going to go over the schematic it’s very simple after the schematic I’m going to be gluing everything in.
Position and showing you how I.
Connect it up now there’s not much to the schematic it’s very simple over here is your 9-volt battery positive over to your switch.