Lightgun Recoil Circuit

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BadMouth:

--- Quote from: Fursphere on April 16, 2013, 03:27:53 pm ---
--- Quote from: BadMouth on April 16, 2013, 09:02:48 am ---
It also auto fires on games that did not have the feature.
Ruins the old games if you ask me....

--- End quote ---

Does the Aimtrak module have a way to hook into MAME and only be enabled for games that support it? Or is that a mamehooker / ledwiz hack?

--- End quote ---

Neither. It's a function of his circuit.

bimm25e:
Hey all thanks for the replies, ive been talking to epicfatigue about his circuit, the problem is that his is for an aimtrak and mine is for a stock namco arcade gun. I have purchased some relays (5V trigger, 24V circuit) and I was thinking those hooked up regularly would make the solenoid close while im holding the trigger. What I'd like if the trigger is held is a series of "snaps" (think, area 51 when you get the auto-rifle, one trigger hold shoots multiple bullets).

I found some writeups where a capacitor is reccommended and you use the cap's charge time to determine the length of pulse,

I found some writeups that say hooking 2 relays in a circuit where the one relay is wired through the normally closed so when the switch is activated it turns itself off immediately after

are either of these ideas viable? If i have a 24VDC/ 4.5A Power supply, and want the "pulsing" to occur while the trigger microswitch from a JAMMA board is held what would be the best way to get a 40-60ms pulse to repeat itself as long as my finger is on the trigger?

DaOld Man:
I think a 555 would be your best bet.
If you just want a single pulse when you fire, using a NC/NO switch and a capacitor may be all you need.
Of course if you want to fire the solenoid, you will need a transistor to turn it on. (With a diode for surges.)
You can place an opto-isolator in parallel with the solenoid to provide a trigger for the electronics that register a gun shot. (This is not drawn on the pic below, but I can add it if you're interested.)

EDIT: fixed a couple of mistakes in the drawing.

bimm25e:

--- Quote from: DaOld Man on April 18, 2013, 07:43:47 pm ---I think a 555 would be your best bet.
If you just want a single pulse when you fire, using a NC/NO switch and a capacitor may be all you need.
Of course if you want to fire the solenoid, you will need a transistor to turn it on. (With a diode for surges.)
You can place an opto-isolator in parallel with the solenoid to provide a trigger for the electronics that register a gun shot. (This is not drawn on the pic below, but I can add it if you're interested.)

EDIT: fixed a couple of mistakes in the drawaing.

--- End quote ---

I like this setup, but I'm wondering could I replace the transistor with a 5V relay? Would this eliminate the need for the diode and resistors? If i used the opto-isolator would that allow me to only "burst" when the gun is pointed at the screen? I think that would be ideal but I have concerns about interfering with the optical sensor circuit in any way because accuracy is a higher priority than recoil.
the parts I already have are:

2x (1 for each gun) - 5V actuated relay (with NO/NC outputs)
2x (1 for each gun) - 24V actuated relays (NO/NC)
2x breadboards
24VDC 4.5 A laptop power supply
10x - 24V diodes
2x (1 for each gun) - 24VDC 4 amp "Pull" solenoids.

to reiterate this is NOT for an aimtrak module its for a stock NAMCO recoil gun, so the only 4 wires I have to work with are

GND
+5V
Trigger
Optical Sensor

DaOld Man:

--- Quote from: bimm25e on April 22, 2013, 12:59:20 pm ---
I like this setup, but I'm wondering could I replace the transistor with a 5V relay?

--- End quote ---

You might be able to, the only problem may be that since the relay draws so much more current than the transistor and resistors would, you will need a bigger capacitor to get the same amount of pulse. But size constraints may not be a problem?
Since you already have the parts, try it.

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