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Yes, busy digesting
MPSA13 and 14 are basically the same thing for your purpose.
L7810cv is not a low dropout voltage regulator (LDO) and you should have at least 3V on top of the regulated voltage, in your case 13V or more. If it is not a problem - go for it.
No. I was considering making it with some changes, but the number of changes happen to be too many and I decided to develop a completely new thing.
Anyway, I like this project. It has the best front end of all the VLF detectors around.
Supplying a detector from 16V adapter is a bad idea. You should try batteries instead. Anything connected to mains is a great source of noise.
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