Electronics > Beginners

Searching for a component that increases resistance with voltage

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Mattjd:

--- Quote from: Yansi on August 29, 2019, 05:34:31 pm ---This is called negative resistance. There is way to many possibilities to achieve and study this.

You can start with just an opamp and a couple of resistors.



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When I saw that thumbnail I thought it was going to be some sort of memristor based thing. It wasn't but it was a circuit made by Chua himself at least.

Brumby:

--- Quote from: ArthurDent on August 30, 2019, 04:06:46 pm ---Technically a relay that pulls in at the voltage of interest and disconnects the load across a set of N.C. contacts would work. The problem is this trip point is probably a little broad and finding a relay to match the criteria will not be easy. A series resistor, which adds a second component, could adjust it somewhat . Once the relay pulls in it will hold until the input voltage drops to a much lower value so you'd have hysteresis.

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This idea is the closest I've seen to satisfy the criteria specified - and - it has the added bonus of having the infinite resistance/zero resistance characteristic isolated from the trigger voltage.

Of course, the criteria specified do have a lot to be desired if we really want to offer appropriate suggestions.


--- Quote from: tggzzz on August 30, 2019, 10:41:04 am ---If the OP would specify the problem or objective to which such a device might be a solution, we could provide more concrete help.

In most walks of life, technical or non-technical, if we know the reason for the question you will probably get a better answer. Either the answer will be more pertinent to your needs, or perhaps it can suggest a better alternative that you haven’t even considered.

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Indeed.

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