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  1. #1
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    analog try catch latch "circuit breaker" (beginners circuits)

    Hi,

    This circuit is very simple and old-fashioned and can be 90% replaced with a uC. For those of us who maybe can't write code yet or like analog solutions, this is my contribution to an analog try catch latch "circuit breaker."

    Someone here suggested in a thread where I had a problem with a circuit to use a try catch latch for inrush limiting and that a uC is much easier and smaller to do that. It got me thinking and as I am currently working/wrestling my way through an analog electronic load circuit idea and I wanted a protection circuit, over the last few days have tried various failed and successful versions and variations and have come up with this as the most useful and reliable version that latches off. It's not so great but for anyone like me who just wants a quick analog solution (1970's components and pcb real estate hog or not), it should work as is I would hope because I've simulated it so many times, am familiar with the real world parts in real circuits, and it is easy to tinker with.

    While only a simulation, it looks very promising real world, and it was nice getting a vague feel for how people had to work not so long ago and appreciating a tiny bit why analog is bulky and disappearing but so great to work with and learn from.

    The images are:
    schematic (resistors on last two 4017 outputs are not necessary, put them there to not get annoying error message on simulating)
    functional block description schematic
    simulated results
    graphical description of input waveform

    In simulations it worked at 5V, 27ºC for spikes, pulses, steps, sine- triangle- and squarewave inputs.

    Hope it's of use to someone or you can adapt it to your needs, that's all. It was a lot of fun working through the idea this far. Any suggestions for improvements are very welcome.

    Thanks

    Click image for larger version. 

Name:	1 try catch latch circuit schematic.JPG 
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ID:	147134

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Name:	1b try catch latch circuit functional schematic.JPG 
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ID:	147135

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Name:	2 try catch latch circuit simulation output signal waveforms ref.JPG 
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ID:	147136

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Name:	3 try catch latch circuit simulation input signal waveform.JPG 
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ID:	147137
    Last edited by d123; 9th June 2018 at 22:34.

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  2. #2
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    Re: analog try catch latch "circuit breaker" (beginners circuits)

    Someone here suggested in a thread where I had a problem with a circuit to use a try catch latch for inrush limiting and that a uC is much easier and smaller to do that.
    I guess you are referring to this previous thread: https://www.edaboard.com/showthread....down&p=1616751

    The circuit looks relative complex. I'm however not sure if the effort serves a purpose, simply because the purpose isn't clearly specified.

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