Electronics > Beginners

Talk me through this simple circuit?

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Mr D:
You've set the cat amongst the pigeons there, mate!

But i don't think it really has a bearing on the basic fundamental that i'm trying to grasp, as any of the things you described could be considered as actually just being part of the same circuit!

Sure, once you insert a reasoning agent into the thought experiment that needs to decide: "how do i connect this circuit to that circuit to get XYZ result", i guess it becomes an issue?!

larrybl:
What i'm not getting is whether there is anything SPECIAL about ground in a battery powered circuit where there is no physical earth to contend with, and no observer to worry about a reference.

Under these limited conditions, i can see no reason not to substitute the word "ground" with "piece of wire".

Ground can also be a metal chassis as depicted in this lawn mower diagram.

larrybl:
I meant to add in the above diagram that there is "not" a wire connecting all the connections on the right side. Most all ground connections are connected to the chassis.

timelessbeing:

--- Quote from: larrybl on June 05, 2019, 09:40:32 pm ---battery powered circuit ... Under these limited conditions, i can see no reason not to substitute the word "ground" with "piece of wire".
--- End quote ---

That doesn't sound right to me.  I think that is has nothing to do with the power source. Take for instance a portable radio. The antenna is a piece of wire, but it cannot be "ground". If you connect it to the chassis then surely the radio won't work right. The same goes for various other parts of the input circuit.

hamster_nz:

--- Quote from: timelessbeing on June 06, 2019, 02:05:26 am ---
--- Quote from: larrybl on June 05, 2019, 09:40:32 pm ---battery powered circuit ... Under these limited conditions, i can see no reason not to substitute the word "ground" with "piece of wire".
--- End quote ---

That doesn't sound right to me.  I think that is has nothing to do with the power source. Take for instance a portable radio. The antenna is a piece of wire, but it cannot be "ground". If you connect it to the chassis then surely the radio won't work right. The same goes for various other parts of the input circuit.

--- End quote ---

Are you sure? my cell phone (and maybe even Walkmans) use the GND of the earphones as the FM antenna...

If you want to see how it is most likely done... https://electronics.stackexchange.com/questions/273469/separating-an-fm-antenna-from-a-topology-which-uses-headphone-ground-as-antenna

(spoiler: there is an inductor between the headphone ground and the design's local ground).

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