Quote:
Originally Posted by mcguyver
Ummm, no. A relay requires time to energize the coil, time that coupled with the spool-up of the gearbox to fire means that you have increased lag. People who use a FET use it to help redce lag.
|
Hmm, you have a point there.. Although, my friend haven't noticed any lag, but i believe you're right. Thanks.
Quote:
Originally Posted by mcguyver
Plus, a relay costs about as much as a trigger switch, especially if you use a quality relay like a Bosch, and it requires energy to close the switch, and does not eliminate arc formation. It moves the arc from the switch to the relay.A relay will also take up room, room that most guns simply do not have in abundance. A Bosch-style relay is about 1" x 1" x 2", a complete waste of space, especially in an AUG.
|
Never used Bosch ones, we tried Takamisawa ones and one other brand (don't remember). Most of them were relatively small, but still a bit larger than carefully soldered mosfet assembly. And yes, a relay (as i found out recently) costs about as much as a DYI mosfet.
Quote:
Originally Posted by mcguyver
A FET is not the best answer either, as it has reliability issues, and is susceptable to the inductive spike generated by the motor. But it's a better option than a relay.
|
That's why we thought of a relay 1st place - reliability. Only last week i sow 3(!) "commercial" mosfets burning out (including the Systema one).
OK, so let's try a FET. We've made some research and finally decided upon this design
http://www.red-alliance.net/phpBB2/viewtopic.php?t=3836
Many thanks to the red alliance. We haven't used the exact trigger model they had, but the relevant parameters are very close. Another change we've made was adding a small radiator to the assembly to help with the heat.
So that's what came out of it.
