title         = 'Laser Assist for Sony R1, Version 2';
intro         = 'After building a crude proof of principal unit, I redesigned everything so that the batteries and electronics would fit inside a single tube. The tube is a common 0.500\" brass tube. It can be bought at hobby stores. The back end (where the batteries are) is a brass tube I removed from a laser pointer. It is 0.510\" diameter. I machined both tubes so that the 0.500\" tube would fit inside the 0.510\" tube. Then I soldered them together. The little LR44 batteries would not quite fit inside a 0.500\" tube. The rear of the 0.510\" tube was threaded, with a brass cap that screwed inside. I made a brass plug that fit inside the cap and threaded it 1/4-20...then added a threaded shaft with an Al knob. The shaft screws in and contacts the + end of the battery stack, closing the circuit.<br><br>The tube is fitted with 2 rings (the front one had to be split so that it would slide over the photodiode support. These rings have thin brass straps that are screwed onto the R1 (using existing holes). The rings can be moved to align the laser. They are locked into position with 0-80 screws (I have ordered 0-80 setscrews...the pic shows a conventional screw in the front ring).<br><br>The LED assist is somewhat visible, so that when it is used to signal during a 10-second delay, it can be seen.<br><br>The laser draws 24mA. Normally it takes about 2.5 seconds to focus in dim light. The LR44 batteries are rated at 125-175 mAh, thus they will work for about 22,000 focus operations.<br><br>The paint I used is Rust-oleum Fine Textured Black paint (the best rattle can type). It matches the stippled finish on the R1 reasonably well.';
footer        = '© 2006 - Charlie Davis';
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majorCaption  = new Array( 'This is the proof of principal that I built and tested.', 'I bought this at WalMart for $10...', 'It had 2 parts inside...', 'Had to remove 3 screws to get it apart...', 'To get inside where the laser was located...', 'These parts came out (I used some of the brass parts later)...', 'This is the electronics assembly, with the laser on the left...', 'Using a lathe, I removed the outer plastic parts...', 'To get down to this...', 'Then I turned it around and finished the front...', 'The cylindrical lens (which gave a line) was glued on. I pried it off with a small screwdriver...', 'This is the final laser assembly which I used...', 'Another view...', 'I glued the laser assembly to a small PCB. The large aluminum piece is a holder for the \"star\" hologram...', 'This is the first fitting of everything...', 'The photo cell is mounted at a 45 degree angle and glued onto an Al piece, which is glued onto the brass tube...', 'A closeup view. Two tiny enameled wires connect the photo cell to the rest of the electronics inside...', 'It\'s painted here. The Al part is the battery switch (screw in to turn on)...', 'Side view...', 'Front view. The hole where the laser light exits the module is threaded so that I can pull out the guts...', 'Closeup front view...', 'As you can see, the electronics is simple. The photodiode that I used is a Motorola LS810, but any similar device can be used...' );
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