I've been listening to the pinexpo talks from this year, and one of the guys mentions a new, lighter pinball power supply. He was talking about Skit-B using a 60 pound power supply and made it sound like the person had a source for a 70V supply, high current, and low cost. From an EE standpoint, it should be very easy to do, but I can't seem to find any links on the web for the new supply. Right now, my method (thanks to Joe for pointing out the website to me) involves attaching a bunch of PC power supplies together, and I only go up to 48V. I have bought a couple of 48V power supplies off ebay, and they only produce about 3A continuously. I can parallel them to get more current, but again, too many gets prohibitively expensive.

I'm assuming the power supply rectifies the voltage, and then uses a buck converter to lower the voltage down to the 70V. Does anybody have any leads on what they guy was talking about? Thanks in advance.

The Antek one is the 60 lb one that is very expensive. Very old technology (essentially the same power supply that is in my EM games.) That guy is a big transformer which of course needs a huge iron core which give you a large cost. I'm looking for a switched mode power supply.

A lot of the SMPS don't have the "jizsm". I also know that that I have a meanwell LPP-150 sitting on my bench right now and it is kicking the flippers without a problem. (Note: I'm using MOSFETs which helps some of the current requirements since they have lower RDSon values).

The flipper coil measures 7.5 ohms cold. Not the strongest flipper, but it is an old EM game that I converted from AC to DC. (The flip and hold solenoids are running in parallel to get as much power as I can from the setup.) As the current flows through the solenoid, the coil heats up and the resistance goes up. What is the resistance at steady state with 48V being supplied? I can't find anybody that has actually published those measurements. I know that it is significantly higher that 7.5 ohms warm because my 3.25A power supply can keep up.

Here are some quick calculations:
7.5 ohms, 48V, gives 6.4A

I don't have a 'scope or I would measure across a known current sensing resistor to get the value at steady state. I'll try and take the time tonight to make up the connectors necessary to use my multimeter to measure the steady state current. I was hoping that somebody might have some measurements handy.

I found the power supply in the talks. The talk is from Skill Shot Pinball and says the have a 32V high current power supply for a little over $30. Of course they have no info on their website so who knows if it is real. 32V seems low for driving coils, but putting two in series should allow them to do 64V.

The 60lb power supply that they were talking about is the one that is used in the Predator machine. I'm not sure if anyone else is using the supply. I think that I saw Ben Heck using a similar supply in one of his pictures of a build. I don't believe that it is really 60lb, but it's probably one of those things where you pick it up and you say, "Man, this thing is heavy. It must weigh 60 lbs." I'm so old at this point that anything over 20 lbs feels like 60 lbs to me.

The Meanwell LPP-150-48 runs $9. It's 48V at 3.25A. Universal 120/240V input.

All my computers are SMPS and when they go bad, it takes me about 10 minutes to switch them out. I don't ever think of servicing them, but just replace with newer/more efficient.

In the olden days of pinball people didn't fix their boards either. They sent them to a repair shop who fixed them and just swapped out the boards. It is only now that everyone looks at the through hole parts and how simple the cards are and they fix the cards themselves. Everybody now has a multimeter to get good measurements on voltages. (An acceptable one of those only costs $8 or $9.) A good number of pinball people have a good scope that gets you that much further.

The Happ power supplies look very similar to the Heck power supply. That might be his source and the Predator guys source. Not sure.

Y'up, that was an over generalization on my part. Sorry about that.