Recent content by sophiecentaur

An interesting project and would look good as a 'mechanism'. However, the long pendulum system has been developed over the centuries to optimise accuracy. The (however) light and flexible tube will be interfering with that already excellent design. To get the best out of a system, I'd have...

If you measure a linear ramp then the source impedance must be designed to be constant current. No problem but one can't draw conclusions about a circuit where 'R' varies. It would be nice to be given the full story from the OP - with some evidence and a description of the system. When there's...

Sorry but that doesn't make sense. If you have a circuit comprising only 'ideal' elements then you can draw no valid conclusions about how it will behave. If you say that the radiation resistance is very small then it will still be the highest value resistance in the circuit so it will, in fact...

Yes; one with circles for pulleys and lines for string etc.. As simple as you like.

You have posted a diagram (which is always a good thing) but it doesn't contain the rope and the pulley. I'm not sure what's really going on. Your hand drawing is absolutely fine and you could make it much easier to read if you tinker with (edit) the brightness and contrast of the image. Black...

Good one. I'm impressed. What exactly did you want to do with the stuff? More experiments? It's banned as a weedkiller and I remember playing with a Chlorate and sulphur mix which you could ignite (bang!!!) when hitting it with a hammer. Not the best explosive though. You've obviously gone to...

Been there, done that. Apart from the fact that all our lives are kept going with few real technical problems, I would have said it's a miracle anything works at all. We all have our own internal metaphors for technical processes. Other people's metaphors often seem crazy. I went to school in...

This is a good example of PF firing from the hip and a misunderstanding of the terms from the very start. We all do it and we get some chaotic threads, as a result. Shame your post was not the first reply in the thread.

Fuses can be used inside a device to protect internal parts of the circuit as well as in supply leads to avoid passing too much current through the lead and heating / melting / burning it. A car will have many internal fuses (two or more fuse boxes), with fuses feeding all the different circuits...

If the inner and outer conductors are connected at both ends then, as there are zero volts between the two conductors at the input, there will be no current flowing in the inner and the cable will behave just like a fat (say 6mm) wire. Whilst there is no fundamental difference between operation...

We still don't know about the 'Galvanometer' and its time constant / dynamic behaviour. If the magnet is falling through the coil for a short enough time, the needle may not move fast enough for a twitch to be visible. My idea of lengthening the magnet was to widen the 'up/down pulse' as its...

Not many five years olds would understand even the most basic of EE and your theoretical five year old might, hopefully grow up to have some awareness that not everything is explicable the way you seem to want. Rockets go up. Only a Rocket Scientist can fully understand why.

I imagine a monochromatic source is modulated by a number of sub-carriers, each with its own data stream. It wouldn't be hard to make the subcarrier frequencies harmonically related to produce a comb. That could make demodulation easier, too.

So lengthening the dipole with a steel bar of a few cm (longer than the length of the coil) would help to give an effect. One last (and possibly insulting suggestion - if so, I am sorry): The wire looks coppery and is it, in fact enamel insulated? Also, has the insulation at each end been...

Many thanks for doing the leg work in this one!! An interesting result I was looking for a practical example of this and I realised that the hot air gun, used for paint stripping is a similar situation. Those things are potentially dangerous and houses have been set on fire by careless use. In...