V2 board used mt3608 (xy-016) and V3 board uses MT3608 (LEDy). ![]() I assume that we still need the tc4056a, and we keep it off the custom PCB? Your V3 board has no space for the charging board. I am now trying to work out which components I have already ordered can be used for the new V3. I have just spent a lot of time, and a bit of money on buying everything for V2, only to discover in the comments that there is a V3 on the Russian page. Please can you update the english V2 page? Is version 3 compatible with the Android App currently available on the play store? 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. 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). 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. 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. The receiver coil still unchanged as in the free version. This amplifier is cheap and very easy to use, has only input/output and power “5v”. ![]() In the online store Aliexpress there are many different amplifiers, in the video tutorial i use one of those cheap amplifiers. 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. 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. 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 frequency of internal generator can already be chosen within the app in the PRO menu. 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.
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