I have been struggling to get the motor speed control correct with the standard club televisor board. I have followed Karen's advice in the last newsletter, and unplugged the 4046 and am able to get the motor free running and display drifting pictures. Today I got the 'scope out and the problem seems to be with the sync separator. At very low video drive levels, 100mV peak to peak, I get a nice clean sync pulse at pin 7 of ic1b. As soon as I increase this, I get multiple spurious sync pulses, which causes the 4046 to overspeed the motor. Any suggestions would be very welcome!
Kind regards, Shaun.