The ground of this circuit is connected to where?

Question

http://manuals.elenco.com/manuals/m-2666k.pdf
Anyone can tell me, the ground of this circuit is connect to where?
I think this circuit ground is not connect to negative terminal of 9V, just all ground connected together only, is true ?

Answer 1

"ground" is actually the reference point from which voltages are measured....

for the meter you linked to, you'd plug the negative [usually black] lead to the COM [or "common"] jack and the other lead to one of the other jacks depending on whether you're measuring voltage [the lower right jack] or high current [the lower left jack] or low current [the jack to the left of the COM jack.

in a lot of circuits, the negative side of the power supply is called the common, or ground side. voltages are measured with relation to that negative lead, and are usually all positive voltages, relative to the ground reference, or "voltage above ground."

some circuits do the reverse.. positive is the "ground" or common side and voltages are measured as "below ground"....

usually, the "ground" side of the power supply is connected to a metal chassis part, too.

that's for most electronics...

in virtually all automobiles in the past 60 years or more, maybe 80 years,.... the negative side of the battery is connected to the engine block, chassis, and so on, and the positive side goes through switches, lamps, motors, etc., "to ground."

in US home wiring, look out.... the GREEN wire is "ground" and actually ends up connected back to the box where the fuses or circuit breakers are, and from there usually to a metal rod pounded deep into the ground.... a TRUE "ground" so to speak.... the BLACK wires are the "hot wires which are connected to switches to interrupt the connection to lamps, motors, etc., and then the "cold" side of the load is connected to the WHITE wires, which run back to the circuit breakers again.....
but here, the white wires are normally at ground potential. grabbing a white wire SHOULD be safe for most simple circuits, but not always.

is that enough for now?

Answer 2

It may be that the battery "floats". That is if you took another volt meter and measured from the "Common" of your meter to to the plus and then the minus of the battery terminal you may find these voltages. From common to the plus terminal +4.5 volts and from common to the negative terminal -4.5 volts. It may be that some part of the circuit needs a bipolar power supply.

PS I have built a lot of Heath Kits - - - had a ball.
Good luck if you build this kit & have fun.

Just a thought

D.bumstead

Answer 3

The only ground I saw was an 'internal digital ground`
which was part of the display system.
This is a hand held meter.
To what would you ground it?
To which circuit do you refer?

Answer 4

connect any grounded wires to a wire that leads to a proper grounding element or to a copper alloy plate 10 ft beneath the ground or a large body of water







































































































































































































































no problem

Answer 5

There is no "ground" connection.

I don't believe that you understand what is meant by "ground", do you? Don't worry, many other people don't either.

Please read this http://www.davidbridgen.com/earth.htm