On 11/04/2020 19:35, John wrote:
I haven't touched a soldering iron for about fifty years, so I thought of
using this shutdown time to get geared up for a bit of tech activity. Got
myself a USB scope, a couple of multimeters and a dual stabilised DC power
supply so far. I have loads of new components in the loft (or at least
they were in 1970 - 1980) left over from various commercial/military
projects. I hope all this will keep me interested for a while. I started
building a novel design for a human presence/movement detector in 1976,
but shelved it because of work commitments, so I will probably continue
with that for starters.

Sorry, I am just lying.

No, you're late forties/early fifties.