Model a Breadboard in Simulator: Capacitance & Inductance

[likephysics]

How do I model a breadboard in simulator. The capacitance, inductance.
For example, if I place a DIP part on breadboard, how much capacitance should I add between the pins in the model?
I think the typical capacitance is 2pf for adjacent pins. What about pins that are 3 pins apart?

 

[berkeman]

How do I model a breadboard in simulator. The capacitance, inductance.
For example, if I place a DIP part on breadboard, how much capacitance should I add between the pins in the model?
I think the typical capacitance is 2pf for adjacent pins. What about pins that are 3 pins apart?

You mean like the white plug-boards, right? What frequencies are you concerned with? Probably you only need to add in the capacitance, which I'm guessing is about 5pF row-to-row, depending on how long your interconnected rows are. You could measure it with an LCR meter if you have one. If not, I can go measure one in the lab for you.

As for inductance, you can ballpark use 10nH/inch for wire, but that depends on the geometry of the "loop" structure, of course. If you have loops connecting stuff (hard to avoid with a breadboard), you can use the standard inductance equation for a single loop of wire, and sort of ratio it based on the area enclosed (if the loop is not round).

EDIT -- Yikes, I just noticed how messy the circuit is on the breadboard picture that I retrieved via Google Images. I should have looked for a cleaner circuit!

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