Not at all likely, in my view. Perhaps you could alleviate my confusion with an explanation of what I've missed? I was talking about the common case of somebody wiring the mains to an input designed for 24 V.
That happens in industrial, sure there are cases where one wires it all up onself, and even then Sometimes the cable numbering is wrong, I remember a technician coming to me with " This design does not work'. What it turned out to be was that he was using the wrong signal cables :- I mean those went through the whole factory, he lost track of the right numbers somewhere.
So opto is usually safer, especially as you have huge ground differences, sometimes when big machines start up etc. Aw man, you're letting reality intrude. Unless it's on a lab bench -- use an opto. I make a series of a board for a customer, both opto and non opto versions. They wire the grounds of both sides of the opto together. They can't see the point of running more wires than necessary. The non opto version actually works better. Forget the theory, how will it be wired?
I was talking about a simple way of interfacing two circuits with common grounds, while it appears you were, and are, talking about how the Peter Principle can manifest itself in a blue-collar world, something totally unrelated! Modifications are quite common. Unless you are designing a one off project and you are prepared to go to the other end of the world to install it, you really have to design your device in such a way that a hardly literate local worker can install it.
A trip to another city, or even across town, can pay for an awful lot of prevention. And if you assume illiterate idiots, you won't be too far off a significant portion of the time. That portion can cost you all your profit as well all your reputation. My solution fulfilled the OP's request for something simpler than an opto, and used under the conditions he specified should function satisfactorily and present no problems.
Of course setting up straw men is your prerogative, but it has precious little to do with the OP's query. He was afforded that answer, and it should be one of a number of solutions to the problem he described and, arguably, the least expensive.
Whether or not he chooses to use my solution is his decision to make, of course, but I'd be interested in your critique of my design bearing in mind the OP's request. Jim Thompson -- James E. Learn more. How to convert a digital signal from 24V to 5V Ask Question. Asked 4 years, 4 months ago. Active 4 years, 4 months ago. Viewed 15k times.
Pierre B Pierre B 93 1 1 gold badge 1 1 silver badge 5 5 bronze badges. Way too little information allows different thoughts and no way to choose among them.
Oh, well. Add a comment. Active Oldest Votes. Current loop on input side is impervious to common mode noise. Isolated grounding gets rid of loops and different ground level issues. Galvanic isolation provides protection to both sides.
I know this should be dead common and simple, but I'm a noob. Thanks for any help. If you do a search for "High Side Driver". Most of the modern devices will be mosfet output rather then PNP transistor, but that should be fine for you. Most of these chips take 5V logic signals and convert them. Jimmy Regular Contributor Posts: Country:.
If you are using cheep solenoids the you defiantly need to protect the micro. Does it need to be solid state and PNP? Zero Super Contributor Posts: Country: You don't need any ICs or a relay. This circuit will work off 24V as well as 12V.
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