Search results

Those cheap units are usually just simple tests for shorts and opens, nothing fancier. One way to do it is to use a bunch of blocking diodes in the receiver unit. If you were designing for a maximum of 8 lines, you could have the 8 indicating LEDs wired with their anodes to their...

Ah, sort of a forum initiation ceremony..... :D

I dont remember seeing 5A sockets before, but quite a number of caravans use 3-pin 2A for 12 volt, the 3-pin version to ensure proper polarity, the earth pin is generally left unconnected. As for those flat slightly-angled pin plugs & sockets as pictured above, most of them I've ever come...

Followed the link from "similar topics" at the bottom of another page and only just noticed the dates. Oh well.....

^^^^ This. The terminals could be connected directly to a c.t. xfmr with A on the centre tap. B & C could be connected to a winding with no tap and A to the midpoint of a resistive or capacitive divider which is across B & C. There are quite a few possibilities. If you qualified it by...

If you select three points at random along any conductor in which AC is flowing, then choose the middle one of those three as your reference, the voltages at the other two will appear out of phase. Go back to the circuit I described above to the point before we added the neutral, so it's...

Do the dictatorial Australian authorities consider it acceptable to cook your own dinner each day, or are you supposed to get a licensed chef in to do it? :roll:

You have to go back a good few years for the different colour BS1362 types. I remember MK fuses being 3A blue & 5A grey maybe into the late sixties or early seventies, before 3A became red and 5A was dropped as a recommended value. (Hard to remember which were new fuses at that time and...

Back in the early days of BS1362/1363 the recommended "standard" ratings were 2, 5, 10 and 13A. Gradually it was considered that this represented too large a number of choices for the average domestic user, the 10A was dropped, and 3A was substituted for the 2A, with 5A still remaining common...

The voltage waveforms aren't out of phase when measured across each half of the load individually based upon a single, in-phase current through each resistance. Draw your secondary winding on the left with two lines across to the right and the load resistances one above the other in series...

That's exactly what it is. It's the current which does the work, i.e. causes the lamp to light, produces the magnetic field which causes the motor to turn, etc. So if there aren't at least two currents which aren't in phase with each other, it can't be polyphase.

And? :?

You can get the same by selecting any random point in a circuit in which AC is flowing, including ones which (I presume) you would not try to claim are anything but single phase (e.g. rural house, 2-wire 240V supply from single phase pole xfmr).

Why do you want to use that c.t. as your common reference point? What's so special about that point?

As a matter of curiosity, what do these new regs say the colours should be on this "two phase" system? The extract (table 51) I have - which I assume is copied verbatim from when the harmonised colours were introduced - doesn't specify them. Has it been changed as well?

Exactly. This is all down to merely which way the two wires from the devices are connected into the circuit. However they're connected up to the source, if you want your two speakers working in phase (as you would normally) and you find that they're actually operating anti-phase, you just...

The voltages at L1 & L2 are obviously out of phase with each other relative to the neutral. But that doesn't make it a two phase system. Select any point along the supply winding of the xfmr, including one which has no tap, and relative to that point the voltages at each end will be 180 out...

What do you mean by "the wrong way round"? I could just as easily point out that when connecting in series across the ends of the winding, ignoring the c.t. neutral, the "wrong way round" would probably be with the -ve of the speakers connected together, since that would result in anti-phase...

By whose definition? Only that of the IET (maybe CENELEC etc.). I very much doubt that the whole of North America, Japan, and other countries which use the arrangement are suddenly going to change the name. So are you saying that everyone in those places who continues to correctly refer...

Because that depends upon the polarity of the magnetic field generated by the coil on each half cycle, which in turn depends upon which way the current is flowing through that coil on that half cycle. And which way the current flows through the speaker coil on any half cycle can be changed by...