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Originally Posted by mbates14
Basically itll lock the frame, and then roll, and lock as suddenly as it rolls, and keeps doing that. maybe the PLL is working now, and trying to lock onto noise, who knows. Hey, its got more life now than what it did.  |
It is morning here in Europe and I have had no morning coffee, so forgive me my bad English.
It is the same trouble I had. In the first attemps I measured the opto fork output with a microampere meter to see whether it works or not. And when it works the next problem was to adjust the motor drive in such a way that one can control the motor speed. You can do it with changing the resistor values.
Resistor at pin 13 replace with 100K. The next resistor, connected with the speed control poti determines the basic speed of the motor. Take a lower value and you have an improved speed control range. I have experimented with values between 20K and 100K. You have to find out what works best. It is stupid and boring work, but I know no better way.
A paper Nipkow disk is not the best solution. For a more stable Nipkow disk, you can use a blank cover CD. Print the attached picture on a piece of paper with your printer (paper should not be diffuse). Sting the holes with a needle, cut the disk out of the paper and put it on a CD with some glu. Take a motor from an old CD-ROM drive and you can drive the disk with the CD-ROM motor. But note that the CD motor needs a very low voltage, if the motor runs too fast, add a resistor (20 - 100 Ohms) parallel to the motor.