A look at some digital timer modules.

There's a wide selection of these little timer modules on eBay, and while seemingly quite useful little devices for including into projects, they do seem to have rather cryptic time setting methods. The two featured here have some very odd and quite frankly poor design features which completely rule out their use in a mains switching application due to ridiculously low isolation between the low voltage and mains side.
Once again, the vague or non existent instructions turned a simple timer into a puzzle (OK, I did enjoy working it out) that had me perplexed for a while with the second unit and the time range feature that can require split-second timing to catch!
But once programmed they do seem to operate properly. The strange design bodges do make me wonder whether they would be stable in the vicinity of inductive loads and their transients.

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Видео A look at some digital timer modules. канала bigclivedotcom