Williams Coin Door Lamps, adding a fuse?

jdhogg

Member
Joined
Nov 5, 2008
Messages
457
Reaction score
2
Location
Appleton, Wisconsin
Reading various threads on this topic, sounds like the lamp terminals are built in a way that they can easily short and damage the switching power supply. I have 12v coming from the edge connector a la "coin bundle" per Bob Roberts.

I'm still a little green with electronics, so what type of fuse/fuse holder can I get to protect my switcher from a short? Should I throw a fuse to my 1p and 2p lit buttons as well (also using 12V)?

Thanks in advance.
 
The coin door lamps and the lamps for the 1p & 2p are on the same circuit. I would recommend removing them from your 12vdc circuit and placing them on the -5vdc circuit. The -5vdc circuit is only used by 4116 RAM, and nothing else. If you have done the 4164 RAM upgrade, the -5vdc is not being used at all. Slap a 1a fuse in there and call it a day.
 
OK, thanks guys.

Dokert, I should have been more clear. The Joust I am working on is jamma with Jrok multi-Wms pcb. And, I already have the 12V wired to the coin and lit buttons with 12v bulbs. :( I used the 12V since I wanted the brightest bulbs possible.

I think I'll pick-up the fuse from Rad Shack and install this weekend.
 
I used the 12V since I wanted the brightest bulbs possible.

A higher voltage bulb doesn't necessarily mean a brighter bulb. It just means the bulb has a higher operating voltage.....nothing to do with brightness.

Edward
 
The coin door lamps and the lamps for the 1p & 2p are on the same circuit. I would recommend removing them from your 12vdc circuit and placing them on the -5vdc circuit. The -5vdc circuit is only used by 4116 RAM, and nothing else. If you have done the 4164 RAM upgrade, the -5vdc is not being used at all. Slap a 1a fuse in there and call it a day.

I don't know if I'd use -5VDC here for the general illumination lights. Most switchers are only rated at 1 amp on the -5VDC rail (some, not even that much).....a #44 bulb is spected at .25 amps. I don't remember howe many bulbs Joust uses under the control panel.....but you've got two in the coin door, plus...add in the 4116 RAMs....it'd be real easy to over load the -5VDC output of the switcher.

My rule on general illumination lighting.....-5VDC is fine (and I recommend it too)....if nothing else is using it. If something on the motherboard uses it....use the 12VDC line. If the motherboard uses that.....stick with the 5VDC line (and put a 1 amp fuse in line...a higher fuse if more that four bulbs are being used).

Edward
 
Or do what I do and use bayonet mount LED #44 replacements. They are very bright on -5V and draw very little current.

And yes, they are more expensive that the regular bulbs right now, but they should last practically forever.

ken
 
I don't know if I'd use -5VDC here for the general illumination lights. Most switchers are only rated at 1 amp on the -5VDC rail (some, not even that much).....a #44 bulb is spected at .25 amps. I don't remember howe many bulbs Joust uses under the control panel.....but you've got two in the coin door, plus...add in the 4116 RAMs....it'd be real easy to over load the -5VDC output of the switcher.

My rule on general illumination lighting.....-5VDC is fine (and I recommend it too)....if nothing else is using it. If something on the motherboard uses it....use the 12VDC line. If the motherboard uses that.....stick with the 5VDC line (and put a 1 amp fuse in line...a higher fuse if more that four bulbs are being used).

Edward

Good point. Joust has 4 lamps in the circuit.

Or do what I do and use bayonet mount LED #44 replacements. They are very bright on -5V and draw very little current.

And yes, they are more expensive that the regular bulbs right now, but they should last practically forever.

ken

Great solution
 
OK, thanks guys. I guess I'm going to stick with the 12V using 1813 lamps. I'll throw a fues on there too. Thanks for the info.
 
Back
Top Bottom