The CT version is 4%, the ACT is 2%. Sent from my iPhone
> On Apr 30, 2023, at 11:37, Wayne S <wayne.su...@hotmail.com> wrote: > > Spec sheet for the 7812 shows 2 versions - 4% and 2% tolerances. So the > voltages your measuring are within the 4% part. Maybe you do need the 2% one. > > Sent from my iPhone > >> On Apr 30, 2023, at 11:26, Rob Jarratt via cctalk <cctalk@classiccmp.org> >> wrote: >> >> I think I have found a possible cause, but not too sure what to do about it >> if I have. >> >> I had to replace the 7812 regulator that supplies Vstart. The new one has an >> output that seems to vary between 12.2 and 12.4V. The 7812 on the good PSU >> outputs a steady 12.1V. I think that is enough to cause the E3d comparator >> to turn the comparator off and allow its output to float high. >> >> I suspect I may have used one with a wide tolerance rather than a narrow >> one, or just have a bad one. It should be a genuine part as it came from CPC >> Farnell. Not quite sure why the output varies on the bad one though. >> >> Regards >> >> Rob >> >> >>
