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Old 5th Jan 2018, 6:27 am   #4
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: Auto-detecting 405 line video monitor.

Al,

Thanks for those kind remarks.

I have also just updated the article, I found a way to eliminate the H linearity error. It simply required adjustment of the S correction capacitor (yoke coupling capacitor) to allow for the longer scan period.

(some multi-standard CRT monitors switch in different values with mosfets) The scan linearity now on 405 vs 625 line mode is practically identical. It also meant the width control/yoke circuit inductance requires no adjustment between modes which frees up a set of relay contacts to switch in the S correction cap.

Updated article : http://worldphaco.com/uploads/Autode...e_monitor..pdf
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