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Step 4Knobs
This gave me a little trouble and you need to have a little skill with a soldering iron. While this electronics job is very easy you do need to know basic soldering technique.
Note: If you are afraid to solder on your C64, you can instead make a paddle box that plugs into your joystick port. There's a link in the next step to an Instructable on how to build one.
Basically what we are doing is connecting two 500k potentiometers (pots) to the number one joystick port. They use the paddle circuits to give your synth some analog controls. Now I want to leave the outside of the port unchanged so I can still plug a stick into it can play a good game of Zaxxon, so I have to solder my pots to contact points on the bottom of the motherboard.
The C64 mother board has a thin sheet of metal on the bottom, soldered to the edges, this is the universal ground for the board, between the rest of the board and the sheet is a sheet of insulator (cardstock). You will need to unsolder a few of the contact points for the ground sheet on the right side of the board so that you can bend it back to reveal the bottom of the joystick ports.
Now solder the pots to each other and the board following my handy diagram. Finally, drill some holes in the top of your C64 to put the pots into. There's a lot of open real-estate in the top of a C64 so you have some aesthetic options.
Note: If you are afraid to solder on your C64, you can instead make a paddle box that plugs into your joystick port. There's a link in the next step to an Instructable on how to build one.
Basically what we are doing is connecting two 500k potentiometers (pots) to the number one joystick port. They use the paddle circuits to give your synth some analog controls. Now I want to leave the outside of the port unchanged so I can still plug a stick into it can play a good game of Zaxxon, so I have to solder my pots to contact points on the bottom of the motherboard.
The C64 mother board has a thin sheet of metal on the bottom, soldered to the edges, this is the universal ground for the board, between the rest of the board and the sheet is a sheet of insulator (cardstock). You will need to unsolder a few of the contact points for the ground sheet on the right side of the board so that you can bend it back to reveal the bottom of the joystick ports.
Now solder the pots to each other and the board following my handy diagram. Finally, drill some holes in the top of your C64 to put the pots into. There's a lot of open real-estate in the top of a C64 so you have some aesthetic options.
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