DIY Scanning Disk TV

[yagosaga]

Originally Posted by mbates14

but its working now.

Congratulations!

Originally Posted by mbates14

More or less, i have line lock, but not so much frame lock. I covered one of the holes btw.

With some "fine tuning" you can improve the line lock. I don't have a save frame lock too. This depends on bad input signals, I still have to do some work here. For frame sync I have installed a switch which interupts the sync pulse for the 4046. When pressing the button of the switch, the motor slows down and afterwards it is locked. In half of starting the disk the motor will be in correct frame sync (plus minus one line). In the other half I push the button.
What I still have is some kind of jitter. The picture in sync is moving slowly up and down. This depends on the reference pulse from the opto fork. The pulse is more a sine wave than a square-wave type.

[mbates14]

mine are just little noisy peaks comming from the fork. They get bigger when I draw it closer together, but it never goes into clipping. It rubs the disk first.

[mbates14]

I know the LED is drawing some current, because the 680 ohm resistor gets hotter than a fire cracker.