Archive for October, 2011

Wiring in the Relay

Now that the power switch has an attached harness, it can be wired up to the computer along with the relay to create a switched outlet.

Looking at the relay diagram again
Relay Diagram

We want to run +12VDC power to terminals 2 and 7. 120VAC is connected to terminals 1 and 8. When the computer is turned on, the coil is energized, turning on the relay. This connects 120VAC power to terminals 4 and 5. Read the rest of this entry »

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Building the Power Switch

Now that I’ve got the plans all laid out for wiring up the switch, it’s time to get my hands dirty and actually do it. Read the rest of this entry »

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Wiring up the main power switch

I know what you’re thinking.

I’ve got a bunch of components in this cabinet, I don’t want to open up the coin door and stick my head in there and turn 5 things on every time I use this machine. I just want one button!

Well, we can do that through the power of electronics.  The mastermind behind this controlled electrical distribution is known as the relay.  A relay is an electrically controlled switch.  So a voltage applied to one side of the relay will turn the switch on.  In our case, we want to be able to turn on power to a number of devices. Read the rest of this entry »

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Cutting out the Cabinet Sides

This past weekend I started cutting wood.  Things are getting real now.

I started out with a nice big pile of wood.  It’s amazing how heavy 10 sheets of 3/4″ of birch/maple plywood is.  It’s bad enough getting them in the car and then you realize that when you get home you have to unload them and stack them and then get all of the car seats back in the car. Read the rest of this entry »

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Easy and Cheap Joystick Mounting

It’s nice to have an easy solution for mounting screws to wood, especially if you are using MDF.  Regular screw can make a mess of MDF if over tightened.  Your best bet is to use threaded inserts which are embedded into the wood.  I had seen Ultimarc.com offering mounting kits for joysticks.  Threaded inserts, screws, washers and lock washers.  For $8 + shipping!!! Read the rest of this entry »

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Monitor Dissection

I’m using a 20″ Dell Ultrasharp 2001FP screen for the MAME cabinet.  In a 4:3 orientation it’s roughly the same size as a 24″ wide-screen.  It’s not quite the same as using a 29″ CRT but at around $80 on eBay it’ll have to do.  Besides, so many of these old games had much smaller screens anyways.  Although I’m sure Dragon’s lair would look better on a larger screen. Read the rest of this entry »

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Control panel wiring harness

Since I’m making three of these and possibly more later, I wanted to make the wiring as easy as possible.  The easiest way to wire something up you ask?  Make a harness.  This will result in some nice clean wiring.  No spaghetti here.  Of course, in order to do that, I need to make a template.  This is the same template that i used when i decided on a layout for all of the buttons and joysticks. Read the rest of this entry »

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