Steve Anderson wrote:Harry, I meant R704 and R724, my mistake again! In a rush as ever these days.
No problems Steve i was going to look into it after i post up these readings in the last post .
Assuming you've got those two resistors right for 400Hz and 12.5Hz it should be possible to work out their value at other rates. Say a 750Hz line rate.
I have to point out my little scope frequency meter accurate up to a point on low readings i couldn't do a 12.5 only 12hz adjustment ...you will notice the readings are close to what is expected on the line frequencies but i was adjusting the frame as i was not sure of the correct line frequencies till now .
Any case the locking to the line frequencies is close so that part must be working up to 64 line 120 line its not at all happening .
If 400Hz required a resistor of 12k then for 750Hz it should be 400/750*12k = 6k4, try a 6k8 first.
In the other direction where you want to slow things down...say 12.5Hz needed 15k, and you want a frame rate of 6.25Hz, 12.5/6.25*15k = 30k, try 27k or 33k. 30k can be approximated by 33k||330k.
Steve A.
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Oh i see the change for 750 hz 60 line ...ok i can try that and see .....just trying to work it out if am correct for a line rate of 120 3khz it would be 1.6k resistor ?
The frame rate should change as before but i will leave that for now and see what the change does for Garys 60 line .
Yes swapping the sawtooth to the deflection amps does sound like a better idea when i get around to it .
i am home today so i will try the line rate resistor change now ...think i will look for a multi switch for this as it will be needed