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M
Mark_W
replied to the thread
Color Classic analog board re-design, needs community feedback.
.
Good job. In your schematic you marked DL1 as BZX84-C8V2 which is a 8.2V zener diode. I also checked the schematic made by @jonschultz...
Jun 12, 2026
Trash80toG4
replied to the thread
Radius Full Page Display for Macintosh 512ke/Plus - Cloning project possibilities?
.
Jun 12, 2026
A
ArjenCNX
replied to the thread
Color Classic analog board re-design, needs community feedback.
.
GOOD NEWS! Thanks to mark_W, i found that i had the wrong value for DL1, the zener diode that protects in case of over voltage...
Jun 12, 2026
A
ArjenCNX
replied to the thread
Color Classic analog board re-design, needs community feedback.
.
Thanks very much, well i have checked the other voltages, and they are all within spec, so that is good, ii trace down C-sync as well...
Jun 12, 2026
M
Mark_W
replied to the thread
Color Classic analog board re-design, needs community feedback.
.
That's normal, unlike main power supply that has feedback control on the secondary, ctr power supply is regulated only on the primary...
Jun 12, 2026
A
ArjenCNX
replied to the thread
Color Classic analog board re-design, needs community feedback.
.
So have 75V on the QL1, it is stable, oddly enough this is without the VGA mod in place, so it should be 60V or so. all other voltages...
Jun 12, 2026
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