Hi

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I have two "jumpers" in my library both made from a single zero voltage source.

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One has a "shorting link" graphic.

One has a "current probe" graphic.

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I don't recommend the use of tiny valued resistor as jumpers.

On Sun, Apr 13, 2025 at 04:11 PM, John Woodgate wrote:

Why not?

On 2025-04-13 23:58, eetech00 via groups.io wrote:

I don't recommend the use of tiny valued resistor as jumpers.

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Because a zero valued voltage sources' behavior is basically transparent to the simulator.

A small valued resistor in not. It still exhibits behavior in the circuit as resistor and could

affect high frequency simulations or behavior of models that contain tiny valued parasitic components.

There are dynamic range issues with very small resistors.

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Pre-LTspice, I saw simulations with very small resistors where voltages drifted a few volts beyond the supply rails.

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Andy

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FYI - not a bad idea to use a custom,?small symbol for a 0 V voltage source, to use either as an ammeter or a net isolator.? Other group members did that already.? Easy to make your own.? Of course it adds the overhead of a custom symbol, which you need to remember to include when sending someone your schematic.

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Andy