Love the different uses examples. Really explains what these circuits are for.
@nickkendall3764
8 ай бұрын
Your the kind of mentor a lot of people are looking for in the ham radio community if i had access to someone like yourself id finally be able to build the million and 1 projects iv always wanted to but without someone to guide me its impossible as i just couldn't afford the trial and error cost of figuring it out myself yea theres a lot of how too and schematics but non of that is all that useful its easy to parrot something but a completely different thing to actually understand what every component and topology decision is for iv found the whole thing frustrating for decades i think some of us just will never make it me included its a shame but for those who do i applaud you your all awesome and the teachers are brilliant its just clear im a bad student thats all ill keep trying tho im 41 and still have the desire to learn so crack on and see what happens
@ebutuoytm7560
6 ай бұрын
Keep going! It's never too late to learn and gain experience.
@Monaco-BuilditFixitDriveitEver
6 ай бұрын
I’m frickin 59 and I’m fixing old car radios now.
@azurehydra
8 ай бұрын
The best mentor ever.
@wonderingworld119
8 ай бұрын
If you use a crystal and a variable capacitor you get a tunable circuit from the crystal (VCO Voltage Controlled Oscillator) , if you add an inductor you widen the bandwidth of that circuit (LC-VCO). ( LC is short for the Resonant Circuit shown at the end of this video L being Inductance and C being Capacitance ) Really enjoyed the video and learned stuff. From a ham radio point of view we of course use inductors as filtering and depending on where we place the capacitor gives us low pass or high pass filtering, and we also use them to filter our radio waves that can if left unchecked, deliver nasty spikes of voltage to unwitting hams (1:1 ugly balun being an example) I have two little scars on my forefinger from the ground on a microphone to prove I didn't know this once.
@danblankenship5744
8 ай бұрын
I love the lesson. I might reference this video in my video where I explain the three different types of metal detectors. 1) BFO (Beat-Frequency Oscillator (oldest technology)). Where two oscillator outputs are beaten together. One oscillator is in the control pod, and the other is in the search coil. If a metal target nears the search coil, the inductance is changed slightly (like a metal slug being moved in and out). This changes its resonant frequency with the beat offset, alerting the detectorist of nearby metal. 2) VLF (Very-Low Frequency (90% of all detectors)). This technology uses two coils located in the search coil assembly. One transmits an AC magnetic signal into the ground, and the second coil is utilized as an antenna. The antenna coil is positioned such that its received signal is nulled out (similar to noise-cancelling). If a non-ferrous metal is near the transmit coil, eddy currents are induced in the buried metal and these currents oppose the magnetic lines of force pushing them back and compressing them slightly. The receive (antenna) coil senses this disturbance and sends an alert to the processor to buzz the speaker. 3) PI (Pulse Induction (the most expensive). This technology uses pulsed DC signals to energize the coil located in the search coil assembly. When the coil is energized, it begins to build up a magnetic field in the search coil. Then the pulse is removed allowing the flyback energy to send a very powerful magnetic pulse into the ground. Milliseconds later (just after the pulse is damped out) this coil is switched to the receiver section and it becomes the antenna listening for magnetic responses from any nearby metal targets. This requires more timing and switching circuitry increasing the cost.
@deedeelabricolade
8 ай бұрын
This serie is gold, now I understand better all those inductors everywhere in power supplies, so many thanks Rich'!
@Monaco-BuilditFixitDriveitEver
6 ай бұрын
Yes! This is so good. It’s very easy for me to get the concepts.
@joshanderson8938
8 ай бұрын
I really appreciate this channel. It is always worth the time to watch your videos.
@HenrikHvalpen
8 ай бұрын
Im very excited for part! Cant wait!
@jonathanrose456
8 ай бұрын
Great video yet again. Would love to see practical examples of the uses on pcbs & the effects of each use on an oscilloscope.
@CATS1952TELLA
8 ай бұрын
Thankyou for teaching us Electronics in a friendly way Regards
@andymouse
8 ай бұрын
I thought you wound inductors round a former or bobbin and then they have a core that can be anything from fresh air to powdered ferrite, but you live and learn !....cheers.
@darrenbird2526
8 ай бұрын
In Australia and first to see my favourite KZitem Channel tutorial
@brieftodo
8 ай бұрын
Nice explanation, the resonant circuit is also called a tank circuit. Think of water sloshing side to side inside a tank.
@nevmoral3539
8 ай бұрын
Great Video. On the next one, can you discuss buck. Boost dc-to-Dc conversion circuits?
@BlueDevilsBari
8 ай бұрын
From a long time sub, Your setup for streams and video postings are always top notch! I realize I am asking a lot here, if you Could or would please share with me and possibly do a "how to" video of how you setup YOUR HDMI live video switching/selecting and capture process and equipment to include your Microscope capture and other sources and software you use and how you position sources when doing live streaming and versus post production? Might make a great interest generating video! I really enjoy your content! Thanks!!!
@LearnElectronicsRepair
8 ай бұрын
I'm happy to do it if viewers want to see how I set up the YT video recording system, hardware, software etc. Let me know if there is any interest out there
@douhacomcastnet
8 ай бұрын
Thank you very much for these lessons, Sir Richard. Do you per chance have a video that describes 0 ohm resisters or Zenor diodes? I am interested in expanding my knowledge for these types of components.
@jameslineham9761
8 ай бұрын
Thanks so much for your videos, learning a lot from them, thanks for your time!
@danyan4385
8 ай бұрын
I learned a lot ! Thank you ! 😀 I'm waiting for the next video !
@knightwar3
8 ай бұрын
Makes sense after watching part 1 nice explanation, maybe you can make a video about inductive and capacitive coupling i've seen this on a tv program
@danblankenship5744
8 ай бұрын
As I mentioned earlier, this is a great video. The only issue I have is (11:30) when you said the voltage would increase if you disconnected the +12V source end of the coil (referenced to the GND side of the coil). Actually, the coil end connected to the +Volt will go negative no matter which connection is opened. I think you were testing us.
@LearnElectronicsRepair
8 ай бұрын
I was disconnecting the negative end of the coil in the experiment with the relay with the switch contents. The +ve end of the coil can't go negative as it is is attached to the positive terminal of my bench PSU which is turned on. Of course this depends on your point of reference for your multimeter, whether it is the negative side of the PSU (ground) or the disconnected end of the coil 😉
@danblankenship5744
8 ай бұрын
@@LearnElectronicsRepair No, at 11:30 you were disconnecting the +12V voltage source. If you are measuring the voltages on both ends of the coil (with an oscilloscope) and you apply 12VDC to the coil, the scope will show a DC +12V level. When you disconnect either connection to the 12V source (the positive or the negative terminal) you will see the 12V level drop below the GND level. Your statement was essentially saying that if you have a water wheel and you stop the inlet of water, the high-pressure input will go higher.
@mohammadusman831
8 ай бұрын
Thank you very much Richard. As I said in the comments on part 1, chokes, coupled inductors, transformers and smd inductors (high side, low side fets) would be lovely to explore.
@mohammadusman831
8 ай бұрын
Not to mention VRMs. In short some real world circuit boards would be nice
@LearnElectronicsRepair
8 ай бұрын
@@mohammadusman831 The second use of inductors I mentioned in this video is basically a VRM
@karlbergen6826
8 ай бұрын
I can think of two things. One of them is tuning circIuits and superheterodynes. Another is transformers. I think both should be discussed. You might also discuss AM vs FM and how TV works. You might want to start with black and white, lay down how that works and then go on to color. Also we could talk about Smart 0hones and computers how they work.
@LearnElectronicsRepair
8 ай бұрын
Tuning circuits like I described in this video? Transformers is it's own topic -coming soon
@Tims_Projects
8 ай бұрын
The high voltage from the coil in the relay reminds me of something I did when I was young. We are talking primary school. My school each year held a fair to raise funds. The stall I had was; pay a half-penny (1/2d) to be electrocuted, haha. People paid 😁 It consisted of the the insides of an old electric bell, the type that had a clanger that rocked between to bells, the bells where removed so only the clanger vibrated. It was battery powered, a wire was attached to the negative of the battery which went to a metal plate to hold, and an other metal plate (held in the other hand) had a wire going to the open side of the coil of the contacts.
@Dutch_off_grid_homesteading
8 ай бұрын
Heya. oke so this tuning is hour cristal ???? correct ???
@joshanderson8938
8 ай бұрын
I realize that car audio isn't really your thing, but it would be awesome if you could do a video explaining full bridge amplifiers. I understand the general concept but I think you could help me understand it better.
@LearnElectronicsRepair
8 ай бұрын
I'm sure I did a deep dive into that kzitem.info/news/bejne/xLCDznyjsouBq5w
@tenlittleindians
8 ай бұрын
There's a video on KZitem titled An Almost Solderless Crystal Radio which uses two tiny inductors that look like resistors as it's tank circuit. Along with a diode and a small disk capacitor it's a working radio! Can your oscilloscope read this tank circuits frequency which is generated solely from the voltage induced into it's antenna from radio waves? The video builds this circuit on a breadboard with just two inductors, a diode and a disk capacitor. The capacitor value can be swapped out to effectively tune in different stations.
@davet3804
8 ай бұрын
Mention Eddy currents in core ??
@ScottHiland
8 ай бұрын
Step 1 of becoming a campanologist is knowing what a campanologist is.
@Monaco-BuilditFixitDriveitEver
6 ай бұрын
:) Good thing you don’t make pumps. 😜
@d614gakadoug9
7 ай бұрын
at about 6:12 "Does the current flow in an out at the same time? No." This is just plain wrong! The current in ALL PARTS OF THE CIRCUIT at any instant is equal. For every electron flowing into one end of the inductor an electron flows out of the other end. Kirchhoff's current law is not violated by inductors. Here is what actually happens. Assume that there is no energy already stored in the inductor, the 12 volt supply can deliver an arbitrarily large amount of current and there is no resistance in any part of the circuit. • At the instant the voltage is applied across the inductor, the current will be zero. • Current will begin to rise linearly with time. Again, at any instant the magnitude of current is identical in all parts of the circuit. • The voltage across the inductor is always exactly equal to the supply voltage - 12 volts in this case - as long as the switch is closed. • An air-core inductor will not saturate. The magnetic field will continue to rise linearly with respect to time. • In an inductor with a ferromagnetic core of a material such as steel, powdered iron, molybdenum permalloy (metal or powder) or ferrite, the core will eventually saturate - increasing magnetizing force will not result in increasing magnetic flux in the core. At that point, the inductor behave as an air-core inductor with regard to continued application of the supply voltage. The current will continue to rise, but with a slope much steeper than before the core saturated. (Different core materials saturate in different ways - ferrite tends to saturate abruptly; powdered iron gradually). At no time does the voltage across the inductor change if the power supply voltage is constant (which means it can deliver the required current). An yet again, the current in all parts of the circuit will be of identical magnitude at any instant. When the external supply voltage is disconnected, the inductor will "try" to keep magnitude and direction of current flow the same. Opening the switch (assume no bounce of the contacts) would result in instantaneous reversal of the polarity across the inductor. In order to keep the magnitude of current the same, the voltage will rise to whatever level is required to do that. In the case in the video where the current was 80 mA and an oscilloscope probe with 10 M resistance was connected, the voltage would rise to 80 mA x 10 Mohms = 800 kilovolts. In practice with a real switch the voltage won't go that high. Much of the energy will be discharged in an arc across the switch contacts - which is the only thing that kept the scope from being damaged! If you want to keep energy stored in an ideal inductor with zero winding resistance, you short-circuit it at the same instant you disconnect the charging supply voltage. With zero volts across the inductor the rate of change of current through it is also zero. The waterwheel analogy also fails. Assuming the chamber in which the wheel is housed is filled with water (not air) at the beginning when the wheel is still, as soon as pressurized water is applied at the inlet, the water flow from the outlet "instantly" becomes equal to the flow into the inlet. There is simply no mechanism by which water can be stored since water is virtually incompressible. It has nothing to do with energy going into making the wheel turn. The _rate_ of flow will increase as the wheel spins up, but the volume of water out will always equal the volume of water in. Similarly, when the inlet is closed, no water can flow from the outlet, regardless of the energy stored in the spinning wheel, unless air can enter the outlet or "cavitation" occurs.
@johnfitzpatrick2469
8 ай бұрын
G,day Richard from Sydney Australia. Thankyou for describing the parts (winding and core) and how an inductor works. * Reducing ripple and noise * Blocking AC allowing DC * Amplifying (not sure) of V I would like to know how to test them and will pay more attention around the power supply board. 💫🧵
@SpenceReam
2 ай бұрын
11:59 🤣 “…and it doesn’t kinda like, hang around sulking in the corner” 🥲
Пікірлер: 42