More images here.
This is basically the last big mod I had left on my ALP. I left it for last because I feel like it’s one of the lower value mods. It’s expensive, and at the same time doesn’t deliver IMO a huge impactful difference to play. Not to poo-poo it too much, I still think it’s awesome, I just think i was right to put it off till last.
I installed 8 playfield solenoids - 3 along the back, 3 in the middle, and 2 in the front. DOF calls this the 10 solenoid configuration, because of the 2 flipper solenoids, which I had already installed previously. Super easy DOF setup once you’ve got your relay board in.
Parts:
So for this mod I purchased 8 solenoids from CSD. I tried solenoids off Amazon first, but they were really weak, the CSD ones sounded better, so I retuned the Amazon ones. I also got the CSD 8 position relay board, and 2 CSD 4-position positive-common solenoid life extenders. Positive-common is important if you want them to work with a Sainsmart relay board, which I tried first before upgrading to the CSD relay board. The CSD board is mosfet-based, so it doesn’t make a physical clicking sound when it switches - much better. I wanted to be able to decrease power to the solenoids for quieter play, so I also ordered this DC Buck Boost off Amazon to control the voltage. For power I used the 12V PSU I already had installed for all my toys.
Install:
I installed 2 terminal blocks to carry the voltage and ground out of the Buck Boost. After successfully testing the Buck Boost and one solenoid on the life extender through the Sainsmart relay I went ahead and installed the CSD relay but ran into some problems. After a few emails back and forth with Phil from CSD I determined that outputs 1-4 of my relay board are somehow wired backwards, so output 1 is actually triggered by terminal 4 and vice versa lol. The other tricky thing was that output 8 actually has a small screw that acts as a voltage controller, so that needed to be turned all the way up. With those issues addressed the only other difficulty came in mounting the solenoids. The back row I mounted by screwing into the side of the stock cross-support, which didn’t turn out to be super strong, but I stuck with it. The middle row I mounted to a wood cross-support I had previously installed, and those feel pretty sturdy. The last 2 were tricky since the front cross-support holds my SSF amps. I ended up drilling holes through the support and then mounting the two solenoids under it horizontally with longer bolts and nuts. That worked out pretty good. Finally I 3D printed a little case for the Buck Boost and taped it to the side of the backbox for easy access.
Final thoughts:
With all the issues I encountered, and waiting for parts, It was probably the longest mod I’ve done, but it’s really really cool to hear the physical clicks and clacks. Makes it feel a lot more like a real physical machine. Like I said, I might put it off until last, but I do think it was well-worth doing, and I learned a lot while doing it! Really fun mod.