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[SOLVED] Simple short circuit protection suggestions need

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Zero999:
Ian,
I wouldn't say your idea is simpler than mine, as it uses roughly the same number of components, just different. It's probably cheaper as another BJT will cost less than an SCR and is easier to get.


--- Quote from: Chriss on April 12, 2019, 03:09:07 pm ---Thanks guys for the help.
The last post from Zero999 with the schematic is the exact solution for my problem.
Can you pls give some advice about a type of SCR I should look for?
Could I use the 2N5061?

Thank you.

--- End quote ---
Yes, that will do, but if you can switch the reset pin, just use Ian's circuit, with common transistors, such as the BC458, PN2222A, 2N3906 etc.

Ian.M:
I agree its not simpler - a SCR direct to the reset pin would be, but I explained why that's no good.

One further note:   Zero999's circuit can also be reset after a trip by a momentry switch across the SCR, and if you want a 'Tripped' indicator put a LED + series resistor in parallel with R3 (same in both).

Zero999:

--- Quote from: Ian.M on April 12, 2019, 08:24:59 pm ---One further note:   Zero999's circuit can also be reset after a trip by a momentry switch across the SCR
--- End quote ---
Or a normally closed switch in series with R3, which will also work in your circuit too.

T3sl4co1l:
No need for a latch, you've got a 555 right there!

If this is like a flyback driver, then something like this will do,
https://www.seventransistorlabs.com/Images/555%20Boost.pdf

Tim

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