DIY Scanning Disk TV

[mbates14]

Didnt know where to post this, so I thought here was good. I thought i would try something new, so I made a scanning disk TV, I burned a disk with some test audio for the disk, and I build the disk based off the design and schematic at this site:
http://bs.cyty.com/menschen/e-etzold...anningdisc.htm

I got everything working, but I have one problem. No Sync.

I have everything built according to the schematic.

But for some reason, my motor is running full tilt boogie. and its not slowing down to the incoming sync. I verified I have a sync pulse from the sync seperator, and I have somewhat of a pulse (even though its way higher in freq) from the optical fork on the disk. So thats working, Both signals are making it to the PLL circuitry, but for some reason, the gate is fully charged, driving it into saturation, which turns the motor on full way.

hmmm. Its no working. Can anyone give me any pointers? note: If i slow the disk down with a rheostat, I can see NBTV. so, I know my circuits are working, but If i hook the motor back up to the MOSFET, it runs full tilt boogie. If I unhook the gate, and ground it. the motor quits, so I know the FET is good.


my pulse from the optical fork, does NOT no where near look like the one on the site. My sync pulse from the seperator looks the same, but the disk fork doesnt. its more rounded and lots of noise, since I have to crank the oscop all the way down on the V/div to see it.