Home  Guides Advanced Gearbox Tech II: Solid State Switching with MOSFETs
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Advanced Gearbox Tech II: Solid State Switching with MOSFETs |
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Written by Jay
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Tuesday, 10 May 2005 |
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Page 10 of 10 Conclusion
The results from testing with MOSFETs show that there are measureable rate of fire gains when using solid state switching, and this is certainly beneficial in and of itself. However, the tests do not show the primary benefit of removing large currents from the contacts of the AEG mechbox: the reduction of arcing and subsequent wear of the contacts. In applications where large currents are involved, the addition of a MOSFET to the mechbox should always be considered.
In our test application, we used the IRF3707 as suggested by previous successes from the Asian airsoft community. While the MOSFET performed admirably in our tests, it nevertheless exhibited significant heating during operation. The MOSFET in our test did not fail, although it is quite evident that the power dissipation rating of the IRF3707 is very near capacity. As such, we recommend the use of MOSFETs with Pd ratings higher than the 87W rating of the IRF3707, especially in situations more demanding than our test configuration.
Addendum
*reader johnyew of Hong Kong has suggested in this thread on our forums that due to a typo, the original intended MOSFET noted at FilAirsoft.com was the IRF3703, which features a significantly higher power disspiation rating of 230 watts. He also suggests the use of IRL1404, a less expensive MOSFET which features a Pd rating of 200 watts.
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