Scope module seems fully working. There were some little problems like the too wimpy regulator and inaccessible test points and the afterthought power switch arrangement, nothing that couldn’t be ignored or worked around. Then I realized I’d used a non inverting buffer on the input, forgetting about TL07x phase reversal. Moreover I’d used two op amps to buffer it twice when I could have used them as a single pair of inverting stages. Sheesh. One design flaw too many, think I’ll get a revised PCB done. And a front panel of course.
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