Software Support > Automated Projects
Using parallel port and mamehooker for gun recoils
DaOld Man:
Wow that recoil is really neat. I now completly understand why you are going for this.
As for the LED resistor for the opto, according to the specsheet, forward current for the led is 60 ma, this seems awfully high to me, and since the printer port is only good for 10-20 ma, I would limit it to that, as long as it works. So according to my calculations, around 220 ohm resistor will limit current to 16 ma. Your 500 ohm you are currently using sets it at around 7 ma, which is safe for the port.
Since it is working with the 500 ohm resistor, I would leave it at that.
Now for the heat, I can see why the solenoids are heating up, they are getting quite the workout.
Can you bore some holes in the gun case to allow air circulation around the coils? Or is it possible to add some heat sinks to them?
Maybe some light weight aluminum to spread some of the heat away from the coil frames?
charlieram:
--- Quote from: DaOld Man on August 27, 2013, 06:45:36 pm ---
Now for the heat, I can see why the solenoids are heating up, they are getting quite the workout.
Can you bore some holes in the gun case to allow air circulation around the coils? Or is it possible to add some heat sinks to them?
Maybe some light weight aluminum to spread some of the heat away from the coil frames?
--- End quote ---
Now this is what I want to hear :notworthy: I don't think the game will ever be played any longer than 10 minutes but I wanted to try the most intense rapid fire game I could find and got quite worried at how warm it became.
Thank You for all the help :cheers:
charlieram:
Just wondering if you took a look at my revised circuit using the resistors as a voltage divider? I haven't built it up that way yet but I'm still wondering if it will do what I am hoping, mainly to provide a voltage of 10v at the gate rather than the full 24v. I'm thinking that because the coil seems to activate instantly that gate supply is more than adequate but the gates actually charge a capacitor don't they? and I'm thinking if I limit the voltage then there will be less voltage to drain from the capacitor at the gate? I really don't know enough about electronics to say whether this is correct or not so I have no idea whether this will work or just go up in smoke!!
DaOld Man:
What capacitor are you talking about? I don't see any in your drawings.
charlieram:
sorry, I mean the mosfet gate capacitance. It seems to get mentioned a lot when I read the datasheets for mosfets and so I assumed they have a built in capacitor that charges initially, this is what I was referring to. :dunno
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