3D coil model for 3D printing.
Here you can download 3D coil model for printing on 3D printer. It’s free! Just download it and it ready to print! Inside the file you can find full 3D model for printers with hotbed bigger than 300x300mm, and also 3D models for printers with hotbed less than 300x300mm. Enjoy!
Download Arduino sketch and schematic here :
Metal Detector "Smart Hunter"
Premium version is a bit different from the free version because it has an internal generator, so in the Premium version it is not necessary to use arduino nor the MOSFET, which facilitates the assembly. The frequency of internal generator can already be chosen within the app in the PRO menu. The generator can generate from 20 Hz to 20 kHz but to detect what we are going to do we will need only from 4 kHz to 20kHz, because the working frequency of most of the “VLF” metal detectors is between 4 kHz and 20 kHz. The assembly is the same as in the free version, but in the Premium version it is easier for not using the arduino and also cheaper. Operation of the internal generator: internal generator generates the sine wave with the selected frequency and the generator signal goes to the transmitter coil (Tx), but since the signal is weak, we must amplify it, that’s why we use an amplifier. In the online store Aliexpress there are many different amplifiers, in the video tutorial i use one of those cheap amplifiers. This amplifier is cheap and very easy to use, has only input/output and power “5v” . The receiver coil still unchanged as in the free version. That means that we mount the receiver coil (Rx) as we can see in the schematic, only if we use Premium version we no longer need the arduino part. On the internet there many schematics how to make an homemade amplifier , so if somebody want to build a homemade amplifier it also will work. The amplifier used in this video has output 3 watts , if we are going to use the coil with bigger size then we must use amplifier with output 15 watts more or less ( depends on the size of the coil). Below in the section “Free Version” we can find video tutorials how to make the coils and how to adjust them, this assembly is the same for the both coils. ,
This is the amplifier i am using in the video. It’s a cheap amplifier, comes in pack of 10. Don’t even try the quality but at the moment it works well and the price is realy very cheap for that. Here below i leave the link to the Aliexpress store where i bought it. It is a stereo amplifier there are many models in Aliexpress i can have a look.