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karls 48. Sorry to give the transitor the wrong polarity but the number is correct BD681. Thanks for pointing this out to me.
Alex N. Yes, it has been working on my original 8 inch dob and on my new 10 inch Light Baucket for a few months and only an hour ago I used it to focus the scope with the new DMK imager test from my living room window. Have a look in the equipment section of IIS. The control shown doesn't have the two speed switch this was added later when I found it was required to get that little bit closer focus. By changing the C you can adjust the amount of rotation required. larger value will provide greater turn and smaller less turn . No, the O ring which is 2 mm thick doesn't slip. . Be sure to have two or three on hand because they will eventually break. Don't chose one too small with a lot of stretch, it isn't needed. One important point to remember if your focuser is as shown, the adjustment knobs must be correctly set or you can make the focus movement too tight. Thanks for your comments If you have never worked with Vero Board be sure to check every copper strip for solder bridge and use a base for the IC . I inspect my work under a strong magnifying glass befor powering up.
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