I'm Ian Poole editor and owner of the Electronics Notes website and accompanying RU-vid channel. My mission on RU-vid is to provide "Understandable Videos about Electronics and Radio or RF technology." My aim is to make engaging videos that are useful for both seasoned professionals and students.
I've always had an interest in electronics in radio & having had an incredibly fulfilling career in electronic engineering and I want to pass on some of my passion for the subject in my videos and on my website. Where possible, I try to draw on my years of experience as a practising design engineer and a radio amateur, and I try to give some hints, tips and practical insights along the way.
The channel covers a broad scope of topics but with an increasing focus on electronic components and circuits.
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can you clarify if the AM signal is carrying data/audio in Sine Wave when it reaches the detector (diode) and is removing half the signals amplitude isn’t that then loss of data or audio as a consequence? or is the data only actually enveloped in the positive side of the wave….? Or is that in the AM the data is duplicated on both sides of the sine wave?…. Your answer on this would be greatly appreciated?
Essentially the modulated data such as a sine wave or other signal is duplicated on both sides of the carrier - its amplitude is modulated. To recover the modulation, one way is to use a diode to remove half of the waveform. A small capacitor is normally included to remove the last elements of the carrier, but this is not normally an issue. The rectified signal can then be amplified to give the required audio, or other signal. I hope this helps.
A few tips of my own: 1) "typ" specs are the ones they sent to someone else. Design using the worst case numbers 2) Remember that the output currents came from the supply connections ensure a low RF impedance on the supplies. 3) Almost all op-amp circuits are ruled by Ohm's law. You rarely need to memorize any other equation. 4) If a number is not given as a min or max in the data sheet presume that one is dreadful for the purpose of design 5) Don't limit your thinking based on examples you have seen (Supply voltages of -7V and +10V are fine for example)
Howdy. Nice. I would like to mention two more points. 1. Keep in mind there is always a small input leakage current. Provide this leakage to be drained not to upset the work point. (Caused a lot of headaches for me.) 2. For Hi-Fi. If half of the output swing suffices. Design the work point to be at about half the B+ or B- to avoid cross over distortion. (A hint i saw in another RU-vid clip.) Regards.
On #2, a resistor to the minus rail can be used to keep the op-amps output in class A. Rarely, however is any of this really needed because op-amps that are really good can be bought.
How many mm bigger than the cable dimension do I need in order to get a neat shrinking and smooth fit? I would like to seal the entire length of a metal-braided camera shutter cable inside a transparent sleeve. And is it possible to get the surface as uniform and smooth without any wrinkles and dips, like the neatness of the sleeve before it was shrunk?
The size needed will depend upon the heat shrink you use. They have different percentage think rates. Often they shrink to around 50% of the original, but this is a very rough rule of thumb. That is why I mentioned into e video to have some shrink that just fits over the cable, etc. In terms of the wrinkles and dips, the shrink sleeving will follow the contours of what is underneath it. Try it and see what you can do.
Terrific videos , We need more like these. I learned the hard way that E-caps are not good for timing circuits as well. They have significant fluctuations with temperature.
Excellent. I agree with the general concept of keeping the working demands on an e-cap well within its limits. However, I believe there may be some misconceptions within the EE hobbyist community... 1) There seems to be the idea that, when replacing e-caps, there is no upper limit to the new cap's voltage rating, so long as it meets the minimum required voltage of the existing e-cap... As an example--- Say you have a 100uF e-cap, with a voltage rating of 10V. And, you replace it with an e-cap that is 100uF, with a voltage rating of 400V, because that is what you have in your stocks... Past common thinking was that this was perfectly acceptable. However, I am learning that, with such a large difference in the working voltage supplied verses the voltage rating stated on the e-cap, the new cap may never completely form, with the consequence that the cap never develops its full capacitance ability. You may not have sufficient capacitance, after all. 2) Likewise, there is the thinking that you may use an e-caps with any capacitance value, so long as that value is equal to, or greater than, the existing e-cap's capacitance rating. From our prior example, say raising the 100uF e-cap value to 1000uF. This will have various consequences (possibly disastrous,) depending upon the use of the particular e-cap... Such as changing the frequency of a timing circuit, or creating massive in-rush current that destroys the entire circuit. I suggest that a video addressing these, and other, common misconception would make a wonderful follow-up video. HTH. Cheers. Sub'd!
Thanks for your comments and the ideas. I will give this some thought and see if I can come up with a few additional points as well. This is a good idea for a video - thanks.
Thank you Ian ... YES , I do agree with all your notes and I experienced all of them in my electronics engineering career so far ... How old are you Sir ?...
I had e GeCoPhone , but I returned it to the owners grandson. The coils were a mess and the valves were missing. The cabinet was not nearly as nice as yours.
Thanks for your comment. I’m glad you found the video useful. Your comment made me wonder whether I should try to include more motivational videos in the channel. I’ll see what topics I can incorporate while trying to keep in tune with the other videos on the channel. Thanks for your thoughts - much appreciated.
Thanks this means a lot. Inspiring for me. I'm struggling not with electronic component uses, but with how they work together and why. And of course what should their values be? But I'll stick with it. Thanks.
Thank you, I remember watching your video some time ago. Two weeks ago I needed to make about 40 meters of 10 awg twisted pair wire and it was not so easy to accomplish. Definitely had imperfections.
Longer lengths are more difficult - it is all about maintaining the right tension on the wires to be twisted. Not easy though, to do the longer lengths.
I have one of these it was given to me by a friend his father was in WW2 and was a wireless operator in RAF my neighbour mounted it on a piece of wood for me they were certainly built well.
Yes, a lot of things were well built then, especially as they had to undergo a lot of punishment in their environment. I didn’t find the key easy to use, but that probably would not have been too much of an issue as the wireless operators would have been wearing gloves as it was very cold at the altitudes they were flying.
@@ElectronicsNotes yeah they would of been used to it my great grandfather was in ww2 and in Kings Dragoon Guards he used wireless and radio out in desert whilst driving armoured cars but I’m not sure exactly equipment he used.
@@Crash-zm2qd these keys were used where they needed a key that was protected from the environment. Sand is never good so that is why your great grandfather would have used one of these. Well done to him for all his service.
@@ElectronicsNotes I have his medals mounted on wall they used to be apart in desert about 60 to 80 miles away and still kept in touch by radio and wireless.
Well there is actually very little difference between the two terms - it's more semantics. People generally tend to talk more technically or specifically in terms of gain, i.e. it has a gain of ten, but use the term amplification for more general talk. You would rarely say it has an amplification of ten, but it would be quite correct in terms of the grammar, etc.
I'm really glad you liked the video. I've got some more along the same lines planned, so keep watching, although it may be a week or three before they go live. We've got some other interesting videos into e pipeline as well.
Information transfer better (faster) than horse rider is key of XIX century progress (beginning with French semaphore telegraph) . It builds modern press, army, trade, and changed world forever (i.e. better, more potent & modern press has strong consequesces in democracy)
Yes it revolutionised global communications to the extent that it was sometimes referred to as the Victorian Internet. With undersea cables, it enabled global communications as well as transcontinental communications.
Very good. The dark resistance can be as high as 20Mohms for some LDRs and commonly is above 1Mohm for most LDRs I've used. Amazingly useful little devices!
Yes it is possible to get some LDRs with very high dark resistance levels, but I wanted to give figures for more average devices. Thanks for the comment.
