Electronics > Projects, Designs, and Technical Stuff

Professional Prototyping Hardware Defined (Breadboard, Jumpers, low R stuff)

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tggzzz:

--- Quote from: TheUnnamedNewbie on July 22, 2020, 06:28:44 pm ---
--- Quote from: tggzzz on July 22, 2020, 06:06:48 pm ---

Now, how does ohm's law relate to those components pictured? (Remember you wrote "But the fundamentals apply equally. Ohm’s law isn’t different in one area of electronics than another")

--- End quote ---

I mean, technically speaking, Ohm's law is related to Maxwell's equations. It still applies to the currents and voltages flowing through those components, it's just that you really need to look at an infinitesimal length of the track (and then integrate) to not have issues with the wavelength nature of the signals.

But I'll let you two get on with your discussion  >:D

--- End quote ---

Ohms law is based on empirical observations, published in 1827. Maxwell's equations are theoretical constructs published 50 years later.

So.... no :)

But Maxwell's equations are necessary  to analyse those components. No lumped equation simplifications allowed :)

Mecanix:

--- Quote from: tggzzz on July 22, 2020, 08:12:59 pm ---Ohms law is based on empirical observations, published in 1827....
--- End quote ---

193 years later and they still sell Breadboard & Jumper Leads Kits that adds up nearly 1 bloody ohm on each conn/trace? wtf is going on, what went wrong guys? am I fully awake and reading this correct?!

tggzzz:

--- Quote from: Mecanix on July 22, 2020, 09:09:38 pm ---
--- Quote from: tggzzz on July 22, 2020, 08:12:59 pm ---Ohms law is based on empirical observations, published in 1827....
--- End quote ---

193 years later and they still sell Breadboard & Jumper Leads Kits that adds up nearly 1 bloody ohm on each conn/trace? wtf is going on, what went wrong guys? am I fully awake and reading this correct?!

--- End quote ---

Not quite. The parasitic inductance of a 20cm lead is around 170nH. At a mere 10MHz that is 10j ohms, at 100MHz it is 100j ohms - in other words the inductance dwarfs a 1ohm resistance.

Mecanix:

--- Quote from: tggzzz on July 22, 2020, 09:25:33 pm ---Not quite. The parasitic inductance of a 20cm lead is around 170nH. At a mere 10MHz that is 10j ohms, at 100MHz it is 100j ohms - in other words the inductance dwarfs a 1ohm resistance.

--- End quote ---

Let me see if I can rescue one of those abominable BB and jumpers out of yesterday's bin and plug back that LCR on one of those whatever/kit/plastic/thing. Let's see what sort of "x" (reactance?) this is pulling out. Might get better luck looking for Breadsword & Pumper wires I have a feeling. 20cm; was convinced the custom 5cm awg22 leads I crimped yesterday (to get me out of trouble) were already way too long...

KE5FX:

--- Quote from: tooki on July 22, 2020, 05:15:28 pm ---And please, drop the “humble” BS: nothing about your posts here has been even distantly humble. Nothing but haughty proclamations.

--- End quote ---

I think you may be missing a cultural idiom or two in this thread, Tooki.  tggzzz is not making a value judgement or sandbagging his own skill set.  He is referring to a general intellectual stance in which an expert, mindful of how it felt when they first entered their field, intentionally tries to replicate the same sense of empowering naïveté in new areas. 

This attitude is explicitly promoted in some companies like Intel, where even the highest level people are expected to spend a lot of time outside their comfort zones.  The idea is to look for places where your intellect and intuition can give you an advantage, but where your ego and reputation don't count for squat. 

In that sense,  an average EE who dives into RF/microwave work is in the same position as an ME who wants to explore EE topics.  Success in either case will boost your reputation, your ego, and maybe even your bank balance... at which point you look for the next thing to tackle as an amateur.

Also, the term 'breadboarding' dates back to when circuits were constructed on literal breadboards.  It can legitimately refer to any method of construction that uses any kind of substrate other than a printed circuit.  Dead-bug construction on bare copper is 'breadboarding,' just like sticking parts into spring clips in a nylon block.

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