I build little MOSFET systems for Airsoft guns to save the trigger from arching and decrease overall resistance. I having the issue of the FETs getting really hot as the replica is fired, until it finally locks closed and burns itself out.
http://unconventional-airsoft.com/wp-content/uploads/2009/08/Simple-MOSFET-Setup-2009-06-22.jpg
I have been building these little trigger chips for some time now, but one particular gun is giving me some trouble. I have tried five different versions of the circuit, making slight variations to the resistors and solder arrangements.
The gun houses an m120 spring on a standard gear ratio with a stock motor, which means that there is a smallish ferrous motor pulling an 8 inch 80lb spring. The system draws about 35A sustained with an initial spike somewhere around 350A, and the battery can safely put out 65A sustained.
I've been dealing with this problem for far too long and am coming to this community in an effort to avoid spending $40 on a commercial Airsoft trigger controller. Please help me figure out why my FETs are burning out.
Super simple system. I'm not very familiar with schematics, so some of this may be off, but I am following the basic idea of the video linked above. The Diode is 18V, placed to absorb voltage spikes.
http://unconventional-airsoft.com/wp-content/uploads/2009/08/Simple-MOSFET-Setup-2009-06-22.jpg
I have been building these little trigger chips for some time now, but one particular gun is giving me some trouble. I have tried five different versions of the circuit, making slight variations to the resistors and solder arrangements.
The gun houses an m120 spring on a standard gear ratio with a stock motor, which means that there is a smallish ferrous motor pulling an 8 inch 80lb spring. The system draws about 35A sustained with an initial spike somewhere around 350A, and the battery can safely put out 65A sustained.
I've been dealing with this problem for far too long and am coming to this community in an effort to avoid spending $40 on a commercial Airsoft trigger controller. Please help me figure out why my FETs are burning out.
Super simple system. I'm not very familiar with schematics, so some of this may be off, but I am following the basic idea of the video linked above. The Diode is 18V, placed to absorb voltage spikes.