![]() The package also includes a recorder, connect it to a listening device and you can record and then play the captured sound. The sensitivity of the probe is -70db, what guarantees high-quality sound capture. The package contains two probes for eavesdropping. The device has a built-in rechargeable 3,7V Li-ion battery. The sound can be amplified up to 20000 times. This device captures audio vibrations from another room where people talk, for example, it amplifies the captured sound and you can listen to it through the headphones included in the package. Simply plug in headphones and a listening probe, adjust the signal strength level and you can listen to the conversation in the room behind the wall. This listening device allows you to listen to sounds from behind walls, doors, or other barriers, such as wood, glass or metal. Your phone will need to have OTG support because the dongle is powered by the phone.Eavesdropping devices - spy bug for listening through the wall, glass, wood or metal + sound amplification 20000x + Recorder (recording device). OR download a compatible app from the Android store, I used RF analyzer, for a few dollars. If you don't have a receiver get a cheap dongle from here: Heat to 250 degree celsius and remove the heat as soon as the solder paste melted. Put some solder paste on each pad with the help of a needle or similar. Assemblyĭownload the EAGLE Light (free) version to visualize the board layout or refer to the board screenshot here. Pay, wait until delivery and you are good to go. Find all the parts as explained in the Youtube video. brd file, choose 0.8mm 2oz, pay and wait until it's delivered.ĭownload the BOM from the google drive folder and go to. Then go to and upload the gerber.zip or. This can be cumbersome but up to 433MHz is certainly doable.įirst you need the PCB. If any modifications are done, like board thickness or copper trace thickness or even the SAW frequency the inductor value will need to be readjusted. The microphone is good for 1.45V only though so you would need to find a way to protect it. Power could even be further increase by increasing the power supply voltage to let's say 3V. Current will increase accordingly though, from 1mA with 620 Ohm to a couple of mA with lower R1 value. Power output can be increased dramatically if R1 is lowered, I tested it down to a 100 Ohm or so a while ago. The parts are almost all 0201 packages for the passive components, they are much easier to assemble than the ones from my first instructable that used 01005 packages. Keep in mind that in order for the circuit to be as small as possible the component count had to be kept as low as possible too, so what you see here is really the bare minimum needed for the intended purpose. The oscillator to the right is basically a simple SAW based oscillator that's being "disturbed" by our low frequency audio signal. To the left is the microphone, the audio signal is capacitively coupled to a very simple amplifier stage and then goes to a varactor diode that modulates the HF oscillator. ![]() ![]() First make sure you have the following tools/materials:Īll the other parts are in the BOM you can find here:Įxplaining the attached PDF schematic (see below):
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