MOSFET DTU V3 PRO Optical Sensor T238

The T238 DTU V3 PRO, a digital trigger unit with optical sensors for V3 gearboxes

The T238 DTU V3 PRO (DTU = Digital Trigger Unit) is a digital trigger unitwith integrated MOSFET, designed to replace the mechanical contacts of a V3 gearbox. It is aimed atairsoft players equipped with AK or G36 replicas who require maximum responsiveness, long-term reliability and extensive control over firing modes. Its all-optical detection technology sets it apart from traditional contact solutions, eliminating wear-prone mechanical parts in the trigger and selector.

Non-contact optical technology: a principle that changes durability

The operation of the T238 DTU V3 PRO is based on infrared sensors that completely replace the usual electromechanical contacts. Both trigger and selector are detected optically, without any part being in permanent physical contact. This principle considerably extends the component's service life, with a claimed resistance of several million cycles.

The integrated MOSFET features ultra-low resistance, reducing energy losses in the power circuit and delivering the necessary current to the motor without excessive heating of the electronics. The wiring is made of high-temperature Teflon, a material suitable for thermally-charged environments.

Configurable firing modes and automatic calibration

The DTU V3 PRO features several directly programmable firing modes: semi-automatic, full-auto, binary trigger, 3-shot burst and Sniper Delay. A special "AUG" mode is also available: it enables semi-auto to be triggered on half a trigger pull, and full-auto on a full pull, reproducing the native behavior of Steyr AUG replicas.

The system is calibrated by automatic learning of the trigger stroke and selector position, enabling precise adaptation to the gearbox without manual adjustment of sensors. Pre-cocking is available to reduce the time lag between trigger pull and ball start.Active Brake stops the motor sharply after each cycle, improving control accuracy in semi-auto and limiting incomplete cycling.

Integrated electronic protection and battery compatibility

The DTU V3 PRO comes with four active protections: against motor short-circuit, gearbox lock-up, deep battery discharge and MOSFET overheating. These protections reduce the risk of material damage under conditions of intensive use or in the event of a mechanical incident.

The accepted voltage range extends from 6V to 16.8V, making the module compatible with 7.4V, 11.1V and 14.8V LiPo batteries. It is compatible with springs up to M150 ; above this value, a high-torque motor is recommended for correct operation. Reversing the polarity of the battery will cause permanent and irreversible damage to the PCB: it is imperative to respect the direction of connection. We also strongly advise against any physical modification of the PCB.

The DTU V3 PRO is designed for V3 gearboxes, with AK and G36 series being explicitly compatible. Matching selector stickers are supplied in two formats: 12 mm for AK replicas and 4.5 mm for G36s. An Auto-loading function is also integrated for motorized Gel Blaster magazines, with automatic activation one second after magazine insertion.

• For which replicas is the T238 DTU V3 PRO designed?

  This electronic trigger unit is specifically designed for airsoft replicas equipped with a V3 gearbox, such as the AK and G36 series. It includes 12 mm selector stickers for AK and 4.5 mm for G36 to ensure optimal sensor operation.

• What is the advantage of optical sensors over standard switches?

  The use of non-contact infrared sensors totally eliminates the mechanical wear associated with traditional switches, guaranteeing a service life of several million cycles. This technology also enables automatic calibration of trigger and selector travel, for enhanced precision.

• Which batteries are compatible with this module?

  The T238 DTU V3 PRO accepts a wide voltage range from 6V to 16.8V, making it compatible with 11.1V and 14.8V LiPo batteries. It is imperative to respect polarity when connecting, as any reversal of polarity will permanently damage electronic components.

• What programmable firing modes does this unit offer?

  In addition to semi- and full-auto, this DTU offers Binary-trigger (fire on press and release), Burst (3-shot burst), Sniper Delay and a specific AUG mode. AUG mode enables semi-auto to be triggered on half-pressure, and full-auto on full trigger pull.

• What is the purpose of Pre-cocking and Active Brake?

  Pre-cocking pre-arms the piston for instant responsiveness to the shot, while Active Brake ensures that the gears stop immediately after each cycle. These features make shooting cycles more reliable and prevent unwanted multiple shots, even with powerful batteries.

• What are the technical limits in terms of springs and motors?

  This module supports springs up to M150, provided a high-torque motor is used for the most demanding configurations. Its ultra-low-resistance MOSFET is designed to handle very high peak currents, ensuring maximum conductivity and reduced heating.

• What safeguards are built in to protect the replica?

  The system incorporates protections against motor short-circuit, gear blockage, overheating and deep battery discharge. In the event of an anomaly, the unit cuts power to preserve the integrity of the electronics and battery.

1 x MOSFET DTU V3 PRO Optical Sensor T238
1 x User manual

• Mosfet
• Model DTU V3 PRO
• Special features Optical detection / Pre-cocking / Active Brake
• Compatibility Gearbox V3 AK / G36
• Brand T238