The rest of the set up includes the Lepy amp and it’s 12v power supply, a 24V power supply and a special Speaker Delay Board that my brother designed. This board is there to keep the cab’s speakers off line until the Lepy amp as fully powered up and prevents a large “Clunk” from sounding during the amps’ power up period. This board is powered by an AC wall wart with a bridge rectifier to make DC to power the rest of the circuit. The AC power supply is there so that when the outlets switch off, the power to the Speaker Delay circuit cuts immediately. The 555 timer on the board has a 22uF/220K Ohm RC circuit so the the 555 has a 5+ second monostable delay.
Here is the “CORE” in the machine with the 24 pin ATX connector attached to the mating receiver in the cab.
The system works great and is a breeze to insert and eject from the cab. Here is the pinout for the 24 pin ATX connector. My motherboard only has two case fan pin outs and I have two fans in the main cab and one in the backbox so I wired the two fans in the cab together so that they are both powered by one set of output pins from the mother board.
A couple of other changes were made to the cab while I had it apart. The first is that I originally thought that a 1 inch hole was big enough for the channel between the cab and the back box. This was a mistake so I cut a new 2 inch hole so that now even full sized 3 prong plugs could fit through. Lastly I have LED lighting in the front and rear of the cab to give light for maintenance of the machine. These lights turn on when the cab’s coin or rear doors open and they were powered by a USB cable so that the lights would come on if the machine was turned off (which is when you often need the light). With the new “CORE” project I switched these to a 5v line from the CPU power supply but found out that they won’t work with the machine turned off so I had to rewire them to the USB cable. There is something special about USB that allows low current power to be applied to devices attached to the mother board during a powered down state.
The last thing that I am going to do to the cab before putting it all back together is that I’m going to route out 3/4 channels for my addressable LED strips to sit in. I currently have to unscrew these strips every time I lift up my playfield and this stresses the printed circuit connectors on the ends of the strips so if I mount them in channels I can leave them in the machine and not risk fracturing one of these ultra thin traces.
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