Metal Detector PIRAT MTX
The PIRAT MTX metal detector has ended up in need of repair. I quickly sketched out its circuit, PIRAT MTX, and took a couple of photos inside the electronic block. In case someone has to repair such a metal detector, as quite a few of them have been produced.
The device is powered by two 18650 batteries, which are charged through LM317 and a balancing board. This setup provides a total of 8.4 volts at full charge, which significantly affects the search depth. To mitigate this effect, some modifications have been made to the circuit, as reflected in the diagram below.
Metal Detector PIRAT MTX Circuit
Comments on the PIRAT MTX Metal Detector Repair
I don’t claim absolute accuracy, as the device came into my hands already broken and after some use, but here are my impressions. After the repair, at full battery charge, the PIRAT MTX performed similarly to a regular pirate with a coil of the same diameter. It has a 50 Ohm speaker, which theoretically should produce a loud sound, but in reality, the sound is quite average, neither too loud nor too quiet.
Photo of the circuit board of the PIRAT MTX (MTX) metal detector
Source Link: http://www.miriskateley.com/