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Using parallel port and mamehooker for gun recoils

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DaOld Man:
That looks like it will work. I trust you have done your research on the mosfet, is it capable of handling the solenoid current? Is the mosfet gate current less than 20 MA?
(I dont know, and Im too lazy to look up the specs LOL)


charlieram:
The mosfet definitely works to drive the solenoid, that is what it is doing now using the pulse from the aimtrak lightgun recoil output but I don't know what current it provides, I suppose I could just give it a go and if it doesn't work then add in the extra transistor shown in your diagram but then would I take power from the +5v on the PC psu and would it be OK with the separate 24v psu's. I tried to find out what the gate current is but man it's confusing for a total noob ???

DaOld Man:
I looked up the specs, and yes I do believe you are right about this transistor being capable of handling the solenoid current.
I am still little cloudy on the gate current draw, but the pin 2 resistor should limit the current flow enough to protect the LPT pin, so I say go with your plan. Try it, if it doesnt work try your plan B.
This looks like an interesting project, looking forward to seeing your results, and please, we crave pictures!

DaOld Man:
Hold on a sec. I just re-looked at the diagram I posted and I do believe the PNP transistor needs to be an NPN, because when the pin 4 is high, you need to kill the circuit.
With the PNP, a low on pin 4 will shut off the mosfet, due to switching the ground to the gate. (Killing your pin 2 control).
An NPN will do this only when the pin 4 is high, which I think is what you need.
Sorry about that.
So I think you need to go back to your first diagram and combine it with your second one. 
(NPN switching ground to mosfet gate).

charlieram:
Thanks for the help, I'm only on the planning/investigation stage and it will probably be a few weeks before I get the time to start ripping my cab and guns apart  :o but when i do you can be sure of some pics of this mod and also my homemade plastic bender which I will be making so I can make my own gun holsters, if it works that is!!

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