(Topic ID: 143586)

System 11(BK2K) MOSFET Mod

By BriPin

8 years ago


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  • 36 posts
  • 12 Pinsiders participating
  • Latest reply 8 years ago by Patofnaud
  • Topic is favorited by 9 Pinsiders

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#10 8 years ago

Every 3-7 driver board i touch I do this mod on anymore. If you can avoid burning off that much heat, go for it. I need to do some current testings, but i am guessing these saves quite a bit based on the amount of heat the stock setup puts out. Another tip.... When using the IRF9Z34N as the column driver, you can use about any weenie NPN transistor for the predriver, like 2n3904.

I have bulk quantity of IRF9Z34N at good prices.
http://nvram.weebly.com/transistors.html

#15 8 years ago
Quoted from ChrisHibler:

And, zero ohm resistors don't have insulated leads. In this case it might not matter, but generally, long, bare leads are not a good thing.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

The heat scales off the solder mask around the column traces. With long not insulated leads you risk shorting between column drivers. I have used heat shrink tube cut in lengths just right. I have also tried using electrical tape to cover the column traces. Using insulated stranded wire *neatly* cut into same length pieces is probably ideal.

Andrew

#19 8 years ago
Quoted from G-P-E:

Curious, why pull the 27 ohm resistors and replace with a zero ohm jumper?
The FET has a miniscule gate current so a 27 ohm resistor should have very little affect on the circuit. Wouldn't it look better having 27 ohm resistors instead of the jumpers? Unless, of course, the 27's are toasty.

It is just because of aesthetics. These resistor get heat damaged, brown, burnt etc...

If I am selling a PCB on this forum. Someone will more likely buy it if it looks clean, etc.. If it has the burn looking resistors, harder sell. Plus if the resistors are replaced with zero ohm someone may go "oh neat, it is upgraded to mosfets" by visual cue alone.

#28 8 years ago
Quoted from snyper2099:

answer = nothing

Just blowing dust from the cabinet up onto the PCBs.

I don't think it is smart to add a fan to any older game in the backbox. You will probably just suck in more dust.

#35 8 years ago

Nice! Happy to hear they made it and you got them installed. I wonder how long it will take before $4.20 is saved from the utility bill with the reduction of power consumption.

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