Відео

You would need to ask Mouser and DigiKey to answer for themselves. My take is that the lifecycle phases are based upon the current production status of the components. When a manufacturer decides that they are no longer financially viable, he will inform the distributors and other interested parties of the fact they will no longer be produced and they become NRND, and then as the last production batch is being planned they go to LTB and then afterwards they are obsolete. The 741, although very old - yes I can remember using them in the 1970s, are so popular that they are still in production. Possibly many of the original manufacturers have stopped making them, but they are still produced widely by a number of other recognised manufacturers, and there are likely to be no plans to stop production. It is this factor that is important despite their age and the fact that there are other far more modern and capable op-amps.

@@ElectronicsNotes Most interesting exception to the rule nonetheless.

@@ricksampson6780 I think there are a few very popular chips that have remained in Active status for many years . . . , but not that many.

@@ElectronicsNotes Yes, but you have definitely flagged a component life-cycle anomaly, cheers.

Thank you for commenting. I’m really glad you found the video useful.

Yes, I needed to make a small change which I could not do in UA-cam studio. Something I wasn’t happy with, not wrong but not quite 100% and the only way I could get it to be where I wanted it was to rework it and repost. Sorry about that.

@@ElectronicsNotes No worries on that sir, I just needed a sanity check. Frankly, I was hoping you'd say that I COULD see into the future!

@@matambale I would love for you to be able to do that and then I could ask for your predictions!

This is a good question and I’ve been thinking exactly how to answer it. The short answer is that it is a common collector circuit which is known as the emitter follower. If you look at the very basic topology at about 2 min 24 you’ll notice the output is taken from the emitter. The same is true on the circuits a little later in the video that you refer to. I hope this helps.

Glad you found it useful.

I’m glad you found the video useful, thank you for your comment.

You may want to watch our video on digital PLL synthesizers to find out more: ua-cam.com/video/5K7Pvc5fxZI/v-deo.html

I was just trying to give people an idea of what it sounded like.

You are welcome.

Certainly you won’t get such a fast rise time if the bandwidth is limited and you don’t get the higher frequency components.

Yes, quality can be good, but care needs to be taken to ensure that the heads are clean and not worn. Also tapes wear and can sometimes lose their top ranges. CrO2 or even metal tapes can help give that extra quality that might be needed on some occasions.

@@ElectronicsNotes I agree, and I think the wearing of the tape is the biggest problem of tapes.

@@gfr2023 This can be particularly true for those favourite pre-recorded tapes.

Thank you - glad you found it useful.

I’m glad you appreciated the video.

I’m really glad you appreciated the video. Thanks for the comment.

Send a number six, then leave a space and send five.

@@ElectronicsNotes thankk uu

I’m really glad you found the video useful. Thanks for the comment.

Glad you liked the video. I keep working at improving the audio, but thanks for highlighting the issue.

I did wonder about that when I made the video but thinking that it was likely to be used in a fixed circuit I opted to add the extra headroom. Possibly I should have mentioned that - I’ll put a comment about that in the description area. Thanks for commenting.

Thanks for spotting that. Nobody has commented about this before. You are obviously very observant. Thanks.

@@ElectronicsNotes ha just me overanalysing stuff. btw, learnt more conceptually from this vid than i have from 3 weeks at uni doing analogue electronics so ty

@@colyeerr No worries, it was a valid comment. Although it is more likely this circuit will be used in a situation where the load is always there, the possibility of it being used where the load is removed.

The circuit works as it is - the output transistor gets its bias from the one connected directly to the Zener - thus us a standard Darlington configuration.

@@ElectronicsNotes thanks. I guess the bias voltage toleraince of the output transistors explains it?

I’m glad you found the video useful. I was experimenting a little with a longer design format, so I’ll consider making one about analogue delay lines. Thanks for the idea.

Not sure where the Stonehenge image is????? I am about 85 miles away from it.

​@@ElectronicsNotes on your wall above you

Ah yes - I hadn’t thought about that. It was a photo I took many years ago and one I like. I took it one evening as we were passing around sunset.

Any breakdown mechanism will be noisy - so yes that are good noise generators.

@@ElectronicsNotes What do you mean by ( breakdown ) ?.... Signal linearity breakdown ?!... Zener diodes don't breakdown linearity but their thermal coefficient is soooo bad that you can't dismiss its effect at all for all load variations ...

Interesting comments - thank you. I confess I had not realised it is the only 9 element Morse character, but yes it seems so.

@@ElectronicsNotes Curiously enough, XXX and TTT, although theoretically sent as one 'character', were actually sent as distinct letters, although slower and more deliberately, to stand out from background noise. Very effective, even in North Sea clutter.

You are right.

I’m glad you found the video useful.

I’m currently in the process of making a video about basic Zener diode circuit design - it will include some of the circuits mentioned in the last two seconds.

Really glad you found it useful. Thanks for the comment.

@@ElectronicsNotes Spoken well too, you have a good voice.

Thanks - I try to make things easy to listen to. I really appreciate your comment.

Keep practicing!! Enjoy 😄

I’m really glad you found the video useful. Thanks for your comment.

And hello to you as well.

You are most welcome. I'm glad you appreciated the video.

Glad you liked it

Don’t think so because I don’t know what javidz9 is.

Thank you for the comment. Glad the video was useful.

Thank you very much! I'm glad the video was useful and I really appreciate your comment.

Keep practising and it will come.

Thanks

They are a fantastic historic item, but not the best key to use. Hope you enjoy it - they are a real talking point.

Glad you liked the video.