Every Capacitor And Inductor Explained With Examples!
Added 2024-11-02 19:22:57 +0000 UTCWhat every capacitor and Inductor does in a radio receiver. See examples of frequency drift due to temperature change, and the affects of over coupling into circuit. See how an oscilloscope probe will drag an oscillator of frequency, where the Ultra Probe remains invisible to the circuit and doesn't affect it in any way. Lots of great tips regarding component replacement and more!
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Comments
Awesome video Mr. C! Love these freestyle walk thru’s where you share your experience and knowledge around how components work in circuits. I would love a bit more detail around how the mixer/oscillator tube and circuit are actually performing the task. That wasn’t clear to me from your description. Thanks again and keep up the great work!!!
Adam42
2025-03-10 16:00:48 +0000 UTCWe enjoyed it immensely!
danny smith
2025-01-06 23:58:05 +0000 UTCThis is the kind of stuff I like learning about. Always learning at various stages of understanding, but always learning. This kind of concentrated overview is priceless in many ways.
Tim
2024-12-25 03:38:53 +0000 UTCNice job as always. interocitor ref - cool. A suggestion on probe loading demonstration - leave super probe connected to counter and connect probe to circuit to see shift, maybe touching connector to ground if needed - i don't think so ... of course if the loading components are actually inside the counter or scope, hook it to a scope input ... just a thought
John Proctor
2024-12-23 05:13:00 +0000 UTCHi Paul. Another fantastic video!! Thanks so much. I have a question regardings running B+ thru the speaker coil. Why would they do that? And regarding the loose coupling of a test lead in the IF section - I use an SDR for alignment purposes and I don't even need to go that close to any of the IF circuitry to pick up my 455khz signal. I use a short piece of insulated wire on the end of a test probe which I just place in a relevant spot in the IF circuit. Would you say that is a fairly safe way of ensuring that the tuning isn't interfered with?
Vincent Stevens
2024-12-15 20:14:42 +0000 UTCThank you for an awesome class today. I loved learning about how each cap affects a circuit and look forward to taking the next class on resistors. I took lots of notes to review later. Interesting about the drag down on a circuit. I will look up and make the unit you mentioned. I learned so much today. Thanks again.
Jared Kusner
2024-12-15 17:46:20 +0000 UTCThe way that 86M is set up as a diode is cool. This is a wonderful video Paul, I've been hoping for awhile you would put out a video of this nature
AndrewHolden
2024-11-22 05:46:17 +0000 UTCSimply a great video! I managed to learn something even if I repair radios as a job.
Alessandro Verona
2024-11-19 23:36:56 +0000 UTCHello, or I'm blind or I don't find the schematich.. Watching the video while I write this..
Carlos Pechiar
2024-11-19 03:44:44 +0000 UTCReally enjoyed this video and the detailed explanations, Would love a future talk about Tuning coils and Q measurement and how to improve the "Q" factor etc.
Michael Putt
2024-11-17 14:34:58 +0000 UTCnice job Paul, your explanations of the components was very easy to follow. Would like very much for you to continue with this series a special note on when to not use ceramic wire resistors and to use a carbon composition instead in the RF circuits. thanks,
Bert Convey
2024-11-14 00:32:36 +0000 UTCI've sometimes heard tubes referred to as "glowFETs" to modern electronics people, given that both tubes and FETs act as voltage-controlled current sources.
Don Tidrow
2024-11-11 19:13:42 +0000 UTCMr Carlson, I cannot tell you how much I have learnt from this video - no doubt I will pick up more from a second and subsequent viewing. So thank you so much for putting this together. I await with bated breath for the next instalment!!
Ian Thomson
2024-11-09 14:20:28 +0000 UTCGreat stuff Mr. C! During your discussion about o'scope-leads dragging oscillator circuits: would it be possible to construct your own buffer, (high impedance to low impedance drive circuit), to place in front of your o'scope-lead? (If you did not have the ultra-probe and needed to get an accurate oscillator frequency measurement using an o'scope). Thanks!
Ernest Mueller
2024-11-08 12:26:30 +0000 UTCThank you for posting this. Super helpful. Would love to see the same type of explanation for FM MPX someday.
Ben Hase
2024-11-07 13:01:29 +0000 UTC👂
Loocianum
2024-11-06 19:33:50 +0000 UTCHighly anticipated, very grateful for this Mr. C! Thank you
Jason
2024-11-06 18:25:58 +0000 UTCThank you for the great video and .PDF!
MRKAPPA
2024-11-06 02:06:57 +0000 UTCYes awsome!! This was great :) Thank you so much Paul :) It really show me what i did understand and all the things that i do not understand.
Ragnar Elstad
2024-11-05 23:17:56 +0000 UTCThank you for the breakdown and tips about component replacement and everything else you talked about with the PDF. It's a big help towards my learning curve. Good video
David simpson
2024-11-05 09:47:11 +0000 UTCHow did they achieve AGC without my favorite .05uf capacitor?
Leonard Peters
2024-11-05 02:18:32 +0000 UTCWell worth a second viewing. I am looking forward to the next one.
Richard Goebel
2024-11-05 01:06:24 +0000 UTCFantastic video! Took notes on a large print-out of the PDF!!! :)
Benjamin Hall
2024-11-05 00:34:23 +0000 UTCExcellent Paul! It's probably something for way in the future, but have you ever considered designing your own vintage style radio using modern parts and incorporating all the things you have learned over the years? It could maybe then be sold as a kit and would be a great teaching aid.
Matt Tracker
2024-11-04 19:24:53 +0000 UTCThanks, Helmut, I see now, missing half of the schematic in the attachment. Re pin 6 voltage divider, R9 appears to be 20k, but could just be a bad scan.
StarryDrolf_YT
2024-11-04 19:22:41 +0000 UTCHi Mr. Carlson great video!
Kenny Fidler
2024-11-04 16:03:27 +0000 UTCI know that companies shave pennies wherever they can, but I don't think a few cm of copper wire would even cost a penny more. A radio was an expensive device, so a few cm more copper wire couldn't make any noticeable difference. Also, back then, they didn't yet make millions of them, like now in china, and the profit was substantial (unfounded assumption). If this was the reason, I would be surprised but richer in knowledge :-) R3: Normally the antenna is DC grounded via one of the three antenna coils. If none is connected during switching, I think it should not make a difference, but it could be. But what do I know ;-) It is unclear to me still.
Helmut Heller
2024-11-04 15:52:41 +0000 UTCMy own thoughts on the use of lower frequency oscilators to achieve the 455Khz I.F. would be that as Paul pointed out in the video, lower frequency coils have more turns, which means more copper wire = higher costs. You could probably use coils with less turns or different ferrite slugs and alter the capacitor used in the tank circuit. This might result in a lower Q circuit? R3? I too would like to know. Is it to always ensure the antenna notch filter is lightly grounded to prevent noisy spikes during channel switching?
David Moule
2024-11-04 14:51:57 +0000 UTCThe videos are fantastic. I've been trying to improve my skills so I can work on my own equipment. I struggle with bridging schematics to actual. Needs some help understanding the ground reference in schematics. As distinguished from chassis ground are all the ground references on a schematic wired together?
BC
2024-11-04 14:42:12 +0000 UTCI believe that the notch filter and the trap filters not only attenuated certain unwanted beacons and other radios LO's it also prevented the 455KHz of this radio getting to the antenna and radiating interference. This was checked at the factory in many countries so the radio could be licenced.
David Moule
2024-11-04 14:26:07 +0000 UTCPaul, this was a fantastic video! Would certainly like to see more of this type of "schematic walk through" in the future! I have several pages of notes!
Bill Hanks
2024-11-04 13:18:04 +0000 UTCPaul, why do so many (but not all) oscillators operate ABOVE the receiving frequency when they could also be below (and lower frequencies are in general easier to handle)? What does R3 do? It seems to reduce sensitivity or make the antenna circuit broader -- but why? Who would want that?
Helmut Heller
2024-11-04 13:14:29 +0000 UTC> the 240 and 230 don't appear to be connected to the transformer. They are, just not directly. Look at the video at 46:21 and you see what is on the other side of that 7-pin socket. So the transformer produces the rectified voltage on the cathodes of the 2X3 tubes, this goes to pin 3, pin 3 is connected to pin 2 in the plug (some safety thing so the receiver is without power if you unplug the speaker), pin 2 is connected to pin 1 in the socket and this is where the 240V line goes off. And this voltage comes from their anodes, which are connected to the transformer (full wave rectifier). The 230V comes from pin 7, which has the primary of the output transformer connected to it, which then goes to pin 1 (which is the 240V). So we drop 10V DC over the primary of the output transformer. > pin 6 of the 6X6 don't seem to add up either You got the voltage divider values mixed up: R9= 10k, R10=15k, so R10/(R10+R9) = 0.6, 70V * 0.6 = 42V. Now, this is the cathode of the 6X6, so the cathode draws an additional current from this divider, thereby raising this voltage a bit. And the manufacturer says, it ends up at 50V. Makes sense.
Helmut Heller
2024-11-04 13:10:20 +0000 UTCI’ve been looking for something like this , great video
Jamie rygiel
2024-11-04 11:23:18 +0000 UTCGreat explanations! One thing I'm not clear on is operation of the power supply -- possibly has to do with the 7-pin socket drawn to the left. I see 240V, 230V and the -16.8V grid bias voltage that comes off of the voltage divider of R17 and R16; the 240 and 230 don't appear to be connected to the transformer. Some voltages, such as at pin 6 of the 6X6 don't seem to add up either -- schematic says 50V, but a voltage divider calculation of 70V*(R10/(R10+R9)) = 70V * 0.429 gives 30V.
StarryDrolf_YT
2024-11-04 01:54:04 +0000 UTCLoved the Interocitor reference!
Manuel Herrera
2024-11-03 19:44:28 +0000 UTCwow! I'm not even a radio guy and your explanations are totally fascinating and educational. Great stuff!
Dave Luxton
2024-11-03 18:49:56 +0000 UTCThank you! Please keep doing these detail videos. In the future would it be possible to show common bugs real time? Leaky caps in tuner sections, weak tubes etc. Big ask but it would be cool to see realtime.
Stanley Benoit
2024-11-03 15:47:59 +0000 UTCI hope you are doing very well, Mr. Carlson !
David Pearce
2024-11-03 14:49:35 +0000 UTCObviously you have a greater understanding of electronics and radios than most as evident by your explanation of removing tubes and replacing them with modifiers. I wish I had that level of understanding.
John E Barron III
2024-11-03 14:32:58 +0000 UTCThank you. Very informative.
Ron M
2024-11-03 14:22:56 +0000 UTCWhat a great class. I want more like this! Thank you.
Marshall Lewis
2024-11-03 13:15:25 +0000 UTCThank you Mr. Carlson!
Michael VanHoe
2024-11-03 12:38:42 +0000 UTCGreat explanation thanks Mr.
Lucas
2024-11-03 04:58:19 +0000 UTCCould you do the next one on explaining the function and purpose of each resistor/pot in the same schematic? Thank you in advance.
Bill Hall
2024-11-03 04:37:47 +0000 UTCThat rogers, well built (except bias cells, well drawn up also. What you don't see on old US radios, spray shield tubes, Robertson fasteners, 2x rectifiers. Beautiful resto.
Tom Harris
2024-11-03 03:33:35 +0000 UTCThank you.
Zexufang
2024-11-03 02:37:41 +0000 UTCthank you Mr. Carlson for the great video on function of the capacitors and inductors in this old receiver. A followup video on the resistors and perhaps how the tubes function, especially the modulator (mixer) would also be greatly appreciated!
Scott Gilbert
2024-11-03 00:31:06 +0000 UTCI hope you do hook up test equipment and show the process of checking and tuning the radio, great content for review.
James E Bowen
2024-11-03 00:14:25 +0000 UTCThis video was great, thanks so much!
Circuitmike
2024-11-02 23:03:57 +0000 UTCReally appreciate you're clarity and depth on these videos Paul.
Eugene Statler
2024-11-02 23:00:01 +0000 UTCGreat video and Lesson, incredible amount of information. Thanks !
Christos Skevis
2024-11-02 22:46:21 +0000 UTCGreat Lesson. I really struggle with knowing what size (UF) capacitor to replace an existing one. I always stay above in voltage. Also i did not know you can use the super probe to connected a frequency counter to measure the frequency of an oscillator. Very Helpful. Question is there a instant where to much voltage on a capacitor is bad. Like say 450v for 150v or 600v for 150. Curios
Gloria Jill Sydor
2024-11-02 22:26:57 +0000 UTCGreat job by the way.
Dave Robinson
2024-11-02 22:08:44 +0000 UTCI'll bet! It's just that all I seem to find are copies of copies. Even my Ryder set doesn't have schematics as clear.
Dave Robinson
2024-11-02 22:08:27 +0000 UTCThat was an immensely helpful video, Paul. Including the schematic was a clever idea - I have marked up my copy for future reference. Thanks very much.
Andrew Black
2024-11-02 20:47:27 +0000 UTCI have quite a library here.
Mr Carlson's Lab
2024-11-02 19:54:32 +0000 UTCInterocitor!
Nirky
2024-11-02 19:45:31 +0000 UTCI've been meaning to ask this question ever since I have been following you here on Patreon and YouTube. Where or how do you get your schematics? You use the best quality schematics you can find, I am curious if you have a "special" source or do you often re-draw them or use some special processing to print them.
Dave Robinson
2024-11-02 19:40:16 +0000 UTCYes!!!! Now I can find out what I know and, most importantly, what I don’t know. I have been waiting on this type of video for a very long time. Thank you, Mr. Carlson!
R Dub
2024-11-02 19:33:47 +0000 UTC
