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25.07.2018 Author: Trzmiel Comments: 0

Review of the new MOSFET circuit with an active brake.

PERUN AB is the second product of the Polish company PERUN AIRSOFT from Goleniów. Following the latest trends, the system has been miniaturized and additionally designed in a slightly different way than the products of its competitors.

The MOSFET is packed in a bag of anti-static foil and closed with a piece of cardboard. The manufacturer's name, logo and a QR code, which is used to download the user's manual, are printed on the piece of cardboard.

It is worth mentioning that the circuit is delivered with partially installed wiring - the power wire (+) and the signal wires. The set also contains heat-shrinking tubing.

The installation of the PERUN AB is simple and requires only 2 wires to be soldered to the PCB and to connect the system with the replica's electric wires in accordance to the diagram below.

Main features:

  • MOSFET – protection of trigger switch plates, increase of ROF 
  • Active break (which can be deactivated with a switch) 
  • Warning against excessive discharging of the battery (Li-Po)
  • Elimination of the vibrating  (by using a microcontroller)
  • Small size

A new feature in this class of circuits is the button built into the PCB allows for turning the active brake on and off and enable or disable the low battery warning. In the packet protection mode, when the voltage drops below the safe level in 30 second intervals, a sound is emitted by the motor, so that we can disconnect the battery before it is damaged by too deep a discharge. It is worth noting that the Li-Po protection function automatically detects the battery's voltage and selects a proper value to activate the warning without the user's input.

PERUN AB works with the following types of batteries:

  • Li-Po, 2 - 4 cells (7.4V to 14.8V)
  • NiMH/NiCd, 8 - 10 cells (9.6 to 12V) 
  • Li-Fe, 3 cells (9.9 V)

Traditionally, the system has been tested with a CTR-02 replica (ProWin gearbox, Guarder SP170 mian spring, Guarder ITU gears, Systema AtoZ motor, an 11.1V battery, 650 FPS). The test consisted in a continuous firing of approx. 500 BBs using single and full-auto firing modes. During the test, the system's temperature increased only slightly, which was due to the transistor controlled by the driver (a special control system for the MOSFET). In addition, the use of a microcontroller in the design eliminates the problem of trigger switch plates vibrations. Thanks to this, one of the factors negatively affecting the durability of these systems, which particularly affects MOSFETs with an active brake, is potentially eliminated.

In my opinion, the PERUN AB is a very successful compromise between size and functionality. This is not the smallest design on the market, but its dimensions allow it to be installed in virtually any replica, while maintaining the functionality that customers expect from a product in this class. The only thing I can complain about is th packaging which does not protect the product in a sufficient.

We would like to thank PERUN AIRSOFT for providing us with their product for testing!

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