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Old Hack EE
Old Hack EE
Old Hack EE
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Thanks for viewing my channel. I'm a retired electrical engineer with a background in analog and RF design. I love using Microsoft Excel for circuit design calculators. I want to pass along my experience with these videos. Please like, subscribe, and click the notification bell so you don't miss any content.
Decibels for Dummies (4k Video)
12:27
Месяц назад
Waveguide Power Handling (4k Video)
8:47
2 месяца назад
Waveguide Demystified (4k Video)
22:30
2 месяца назад
Guitar Pickup Signal Injector
5:41
3 месяца назад
Best Fit Voltage Divider (4k Video)
14:19
4 месяца назад
Loaded Voltage Divider (4k Video)
4:29
4 месяца назад
A Little About Crystals (4k Video)
32:25
4 месяца назад
Astable With Duty Factor (4k Video)
14:20
5 месяцев назад
Capacitor Charging Equation (4k Video)
6:29
6 месяцев назад
Comparator Hysteresis Spreadsheet (4k Video)
15:27
6 месяцев назад
Comprehensive Comparator Hysteresis Design
8:45
8 месяцев назад
Sallen-Key Component Calculator Spreadsheet
14:36
9 месяцев назад
Engineering Prefixes for Capacitors
9:20
9 месяцев назад
Sallen Key Component Selection
14:52
10 месяцев назад
Sallen-Key Filter Analysis
8:49
10 месяцев назад
Root Mean Square of a Sinusoid - With Derivation
6:55
11 месяцев назад
Cut & Boost Level Control
14:01
Год назад
Wire Temperature Rise Calculator
21:21
Год назад
Tremolo Circuits - The Oscillator
16:52
Год назад
The Audio Taper Potentiometer
18:57
Год назад
Excel Chart Peak Detector
6:56
Год назад
Комментарии
@viknsky2716
@viknsky2716 3 дня назад
Hi, how to change(transform) L and C for printed board circuit? Like, how to calculate length and width?
@oldhackee3915
@oldhackee3915 3 дня назад
I’ve seen it done, but I haven’t done it
@mikechoi5796
@mikechoi5796 4 дня назад
I am a big fan of your videos. I love the fact that you mathematically derive your explanations. I have noticed that there is a "dearth" of microwave theory textbooks, or lab manuals for that matter, that set forth the underlying mathematics of simple RF network analysis equations - simple transmission line problems for complex series and parallel networks. Could you recommend a couple of microwave theory textbooks (or lab manuals) that derive their equations and support their equations with "enumerated" examples (I am really looking for "textbooks" with enumerated solutions)?
@oldhackee3915
@oldhackee3915 4 дня назад
Thanks so much. Unfortunately I have not seen a RF book that does what you are talking about, which is a shame. In my observation, it looks like RF and microwave text book are regurgitations of previous ones, especially with waveguide. It’s a bunch of vector calculus with no real world examples. I wish I could be more help.
@karanmittal2293
@karanmittal2293 4 дня назад
Can you explain formula used in excel
@oldhackee3915
@oldhackee3915 4 дня назад
I just digitized the graph from that design guide and let excel display trend lines with equations and used those in excel.
@Alan96555
@Alan96555 6 дней назад
Very complete video! Do you know if there is a way to demonstrate or find the matrix of the rotator from the circuit with the operational? I tried but it didn't work out. I also didn't find any books that talk about the subject in detail or that give demonstrations, most of them just spit out the equations without showing where they come from.
@oldhackee3915
@oldhackee3915 6 дней назад
Thank you. No, I do not.
@frunsebischkek1050
@frunsebischkek1050 8 дней назад
I like your channel very much! As I understand, if you replace the delta connection Z3, 4, 5 by a star connection you could eliminate one part pointing to negative input of the opamp.
@oldhackee3915
@oldhackee3915 8 дней назад
Thanks. I don’t understand what you are saying. I drew it the same way most textbooks do.
@morokali6603
@morokali6603 10 дней назад
infinite thanks sir, best videos for the next generation of electrical engineering students
@oldhackee3915
@oldhackee3915 10 дней назад
Thanks so much.
@morokali6603
@morokali6603 10 дней назад
@@oldhackee3915 btw sir can you make videos about S parameters of active components ?
@oldhackee3915
@oldhackee3915 10 дней назад
Are you talking about scattering parameters of microwave components or the Laplace s shorthand?
@morokali6603
@morokali6603 10 дней назад
@@oldhackee3915 the scatterin params sir
@oldhackee3915
@oldhackee3915 9 дней назад
I’ll consider it. Thanks
@Robert_DeVille
@Robert_DeVille 17 дней назад
That was so good, I watched it twice! Many thanks, this is really great.
@oldhackee3915
@oldhackee3915 17 дней назад
Thanks so much
@biswajit681
@biswajit681 18 дней назад
Excellent!!! Could you please make a video on ADC or DAC interfacing circuit with opamp
@dipakbhalodia7155
@dipakbhalodia7155 23 дня назад
All video is best learn yu video आपका हम आभारी हैं
@oldhackee3915
@oldhackee3915 6 дней назад
Thank you
@biswajit681
@biswajit681 Месяц назад
Eagerly waiting for new video
@oldhackee3915
@oldhackee3915 Месяц назад
Another is coming soon.
@usopenplayer
@usopenplayer Месяц назад
If you had asked me before watching this, I would have assumed that breakdown voltage increased with less air. I find it very counter intuitive that less air means less power. I'm guessing that it starts to curve back up once you get near vacuum, since there's nothing to ionize?
@oldhackee3915
@oldhackee3915 Месяц назад
Indeed. I found the Wikipedia page to help me understand. en.m.wikipedia.org/wiki/Paschen's_law
@EngineerAnandu
@EngineerAnandu Месяц назад
Sir, pls share the link of spreadasheet.
@oldhackee3915
@oldhackee3915 Месяц назад
I added a link to the spreadsheet in the description on all 5 videos. It was originally only in part 5.
@EngineerAnandu
@EngineerAnandu Месяц назад
Thank u so much.
@oldhackee3915
@oldhackee3915 Месяц назад
Thanks for the comment.
@EngineerAnandu
@EngineerAnandu Месяц назад
Pls upload move vids.
@EngineerAnandu
@EngineerAnandu Месяц назад
Please do more opamps vids.
@oldhackee3915
@oldhackee3915 Месяц назад
What kind would you like outside of all the ones I have already done?
@EngineerAnandu
@EngineerAnandu Месяц назад
Thank u sir.
@oldhackee3915
@oldhackee3915 Месяц назад
Thanks for the comment.
@EngineerAnandu
@EngineerAnandu Месяц назад
Thank u sir.
@oldhackee3915
@oldhackee3915 Месяц назад
Thanks for the comment.
@shanefrank3281
@shanefrank3281 Месяц назад
One of the best videos on this and much more understandable than what I have seen in textbooks. Thank you! I know that using a cap in parallel with the feedback resistor is common with inverting amplifier circuits, but I have also seen it in non-inverting amplifier circuits. Of course at higher frequencies that cap will only reduce the closed loop gain to unity, until some other pole reduces the gain further at higher frequencies. So does the cap in parallel with the feedback resistor in non-inverting configurations help with closed loop stability?
@oldhackee3915
@oldhackee3915 Месяц назад
Yes indeed. For stability, you only look the feedback network. While the overall circuit is a low pass filter, within the feedback loop is a series capacitor which results in a stabilizing zero. Great question. I should have included that in the video.
@tanjiaxin9669
@tanjiaxin9669 Месяц назад
Thanks man, u saved me !
@oldhackee3915
@oldhackee3915 Месяц назад
Great to know. Thanks for your comment.
@hamidk4772
@hamidk4772 Месяц назад
Outstanding
@oldhackee3915
@oldhackee3915 Месяц назад
Thanks so much.
@dougwilliams44
@dougwilliams44 Месяц назад
POTENTIOMETER senses Voltage Potential 😊😊
@forgeteverythingyouknow5413
@forgeteverythingyouknow5413 Месяц назад
Awesome explanation... and the visuals were incredibly helpful. The use of motion From diagram to diagram was really A terrific support to help understanding the concepts.
@oldhackee3915
@oldhackee3915 Месяц назад
Thanks so much for the comment. I’m glad that it was clear.
@maxpetrelli2142
@maxpetrelli2142 2 месяца назад
Thank you Sir for your excellent video. It helped me a lot in finding an oscillation problem on my new linear power supply design.
@oldhackee3915
@oldhackee3915 2 месяца назад
Glad it helped. Thanks for the comment.
@ianadshead5394
@ianadshead5394 2 месяца назад
Hi. Thanks for posting this, really useful. I am a lefty guitarist who struggles to source reverse logarithmic pots, and after watching your video I was wondering if I could convert a standard 500k linear potentiometer to logarithmic by fitting a 75k resistor to it? I'm thinking the resistor would be connected to the centre lug and the outer lug that is going to ground? Any thoughts? Thanks 👍
@oldhackee3915
@oldhackee3915 2 месяца назад
Yes indeed. Just know that the added load resistance will damp the pickup’s resonance (usually less highs). Let us know how it works out for you. Thanks for the comment.
@SamuelMolines
@SamuelMolines 2 месяца назад
Isn't it more proper to say "Voltage between opamp inputs is zero (virtual short) if the opamp has an infinite open loop gain AND is in a negative feedback configuration." ???
@oldhackee3915
@oldhackee3915 2 месяца назад
Yes I’m sure there were a lot of places I could have spoke better words in these videos. Thanks for pointing that out.
@BrentLeVasseur
@BrentLeVasseur 2 месяца назад
Nothing “cancels out” because that would violate the second law of thermodynamics. Energy cannot be created or destroyed. What happens when you have two equal but opposite current flows 180 degrees out of phase is it creates a bucking coil effect, where by the two transverse waves collapse (not cancel) to form a single longitudinal wave, which registers as a voltage potential. Essentially all capacitors are standing longitudinal waveguides, where in the simplest example you have two parallel opposing metal plates separated by a distance of air or some other dielectric. When current flows into a capacitor, the current, which is TEM or transverse electromagnetic, starts to bounce back and forth between the two plates until all the current eventually phase-collapses into a single longitudinal standing wave in the Aether/ZPE field, which again registers as a voltage potential on an oscilloscope. The energy does not ‘cancel out’ but is transformed. And when a capacitor is discharged, the reverse happens, where by the longitudinal standing wave is converted back into transverse-electromagnetic current flow. It’s a ying/yang effect where energy is constantly being transformed from TEM to LMD and back again. LMD stands for longitudinal dielectric mode. The dielectric field in matter is what determines its conductivity and permittivity. And in a transmission line or coax cable you have both happening at the same time, as some current is transformed from transverse-electromagnetic into longitudinal dielectric, which is why all cables have capacitance, resistance and generate heat losses. It all comes down to the wave effects.
@usopenplayer
@usopenplayer 2 месяца назад
My first desire is to create a resonator between these two modes.
@campbellmorrison8540
@campbellmorrison8540 2 месяца назад
So what does that mean for waveguides in space, it looks like its down to a few watts would that be right? or is voltage breakdown in space much higher as there is no air
@oldhackee3915
@oldhackee3915 2 месяца назад
The voltage breakdown goes back up in a vacuum. The Wikipedia page on Paschen’s Law the graph is better than mine as it approaches a vacuum.
@douglasstrother6584
@douglasstrother6584 2 месяца назад
The next regime of microwave mayhem for space applications is known as multipaction or multipactor. It is a resonance breakdown phenomena requiring both a vacuum (no air) and radiation (free electrons) environment.
@douglasstrother6584
@douglasstrother6584 2 месяца назад
@@oldhackee3915 Your plot is fine. There is a lot of interesting Physics summarized in a Paschen Diagram, especially that the x-axis is product fo frequency*dimension.
@douglasstrother6584
@douglasstrother6584 2 месяца назад
Look-up Hatch & Williams regarding Multipaction.
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks for the comment.
@nonsquid
@nonsquid 2 месяца назад
Maybe if we used sulfur hexafluoride gas SF6 as a wave guide quench gas, we could push more power. I guess we would have to shield the outside as well as the inside.
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks for the comment. That sounds interesting.
@Duracellmumus
@Duracellmumus 2 месяца назад
If the capacitance not change and dielectric looses not going to be mutch higher than as air use as insulator.
@nonsquid
@nonsquid 2 месяца назад
@@Duracellmumus So does that mean we can't use wave guides in the vacuum of space without the dielectric of air?
@robbieconnor9992
@robbieconnor9992 2 месяца назад
Thank you for your great videos!!
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks very much.
@biswajit681
@biswajit681 2 месяца назад
Please upload some analog stuff 😊
@oldhackee3915
@oldhackee3915 2 месяца назад
Too much microwaves for you?
@douglasstrother6584
@douglasstrother6584 2 месяца назад
@@oldhackee3915 There's never *too much* microwaves!
@petersage5157
@petersage5157 2 месяца назад
Microwaves _are_ analog! They're just in one of the gaps in our analog ranges of perception. Too fast to hear; too slow to see. As far as I know, Old Hack hasn't uploaded anything that _isn't_ about analog, and I love him for that. None of that digital rubbish on this channel!
@milesprower6641
@milesprower6641 2 месяца назад
The math melts my brain, but i can intuitively visualize the fields in a general sense for stuff like this. But the details escape my grasp.
@oldhackee3915
@oldhackee3915 2 месяца назад
Sorry. Wish it would have been more helpful.
@milesprower6641
@milesprower6641 2 месяца назад
A glass rod is just a waveguide for THz RF ùwú
@SkipFlem
@SkipFlem 2 месяца назад
I used to build and test 4 port c band rotary waveguide switches...amongst others.
@oldhackee3915
@oldhackee3915 2 месяца назад
Very cool. Thanks for sharing.
@Max_Marz
@Max_Marz 2 месяца назад
This was fascinating, thank you. I'm 32 and I've spent a lot of time exploring the various long-lines towers in my area and I've never even remotely understood how waveguides worked until now. I just assumed they were like a fiber-optic pipe for radio waves, hap hazard bouncing along like a river of energy in there. As a machinist by trade, I find it particularly fascinating the relationship of the physical dimensions and tolerances to the frequencies and efficiency of the system. Can it be dangerous to send the wrong frequency down an incorrectly sized waveguide to ending up with current on the exterior surfaces of the waveguide?
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks for the comment. I believe the only thing wrong you can do is overpower it.
@nikbl4k
@nikbl4k 2 месяца назад
o wow. jus found ur channel. very cool stuff
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks so much.
@Chiavaccio
@Chiavaccio 2 месяца назад
👏👏👏🔝👍
@oldhackee3915
@oldhackee3915 2 месяца назад
Thank you.
@Chiavaccio
@Chiavaccio 2 месяца назад
@@oldhackee3915 😊😊👋
@jimgeorge8956
@jimgeorge8956 2 месяца назад
Thank you for the video, it's a nice, concise explanation. One thing to add: the fact that the length of the choke is not constant across the broad wall helps make the match better over a broad range of frequencies. If the geometry was made exactly lambda/4 over the width of the broad wall, we'd get a good VSWR at only one frequency. Also, beyond about 40 GHz, it's common to see the UG/387 style flanges that use alignment pins to ensure that the tiny openings stay lined up. I have not come across choke flanges below WR-28 (Ka-band). I suppose the grooves become too difficult to machine.
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks so much for the comment. That's great information. Thanks for sharing.
@campbellmorrison8540
@campbellmorrison8540 2 месяца назад
excellent, I know nothing about wave guides but that helps no end. I do wonder how the ripples in the flexible concertina walls don't cause all sort of reflections, are they at 1/4 wavelength apart or something?
@oldhackee3915
@oldhackee3915 2 месяца назад
I don't have any experience with the flexible elliptical waveguide. I surmise that it only adds length, otherwise it would not be very useful. Thanks for the comment.
@jitgtij
@jitgtij 2 месяца назад
Immensely insightful, thank you so much ❤❤
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks so much.
@jasonkomsa5218
@jasonkomsa5218 2 месяца назад
I've built the circuit shown at the 5 minute mark to condition a signal from a piezo disc. I'm attempting to collect chest expansion (from breathing) and heart beats when the piezo is laid upon. I was wondering if you could comment on the 2 capacitors stimming from the V_s? How to size them and why are there two? Thanks in advance!
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks for the comment. It depends on how noisy your supply is. If the power comes from a rectified AC line and has some power line ripple in it, it's typical to have a large value capacitor like a 10-47µF electrolytic or tantalum type. Since most large capacitor values will have a significant Effective Series Resistance (ESR), it's necessary to put a smaller value ceramic or mylar type in parallel, having a low ESR to help shunt the higher frequency noise that may be on the supply line.
@Richard-vw8no
@Richard-vw8no 2 месяца назад
My experience with waveguides goes back to the mid to late 60's when I operated and maintained tropospheric scatter equipment. Never understood the theory but I like your vid. Thanks.
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks.
@ChodDdles
@ChodDdles 2 месяца назад
This explains so many things and adds new questions to my understanding, thankyou
@oldhackee3915
@oldhackee3915 2 месяца назад
Thanks.
@paradox_1729
@paradox_1729 2 месяца назад
Thank you.
@oldhackee3915
@oldhackee3915 2 месяца назад
You're welcome!
@RideGasGas
@RideGasGas 2 месяца назад
Thanks so much for this. I rarely comment on videos before watching the whole thing but I'm going to go ahead and do so here. Part of my current job has me working in international standards committees and with national, regional, and international regulatory bodies to help develop new standards for my industry and new regulatory rules for the operation of equipment in various frequency bands. I had seeing unexplained numerical constants in formulae or rules and where possible have pushed for anything I've worked on to at least show the derivation of the constant in the document so that newcomers will understand how the constant came about and what it contains. The other is getting people on board with the SI and carrying units through in formulas documents. This allows folks to follow along and get used to doing some unit analysis long the way. If when working through the problem on their own they come up with meters per second when they were looking for watts per hertz they know a mistake was made along the way.
@oldhackee3915
@oldhackee3915 2 месяца назад
That’s a very interesting job you have there. Knowing the units gives me a satisfying feeling to say the least. Thanks for the comments.
@RideGasGas
@RideGasGas 2 месяца назад
Thanks for this. Have been working in the satcom industry for almost 50 years and have worked with my share of waveguide. Interestingly I think usage has declined a fair bit in recent years as there's an increased shift to smaller solid state power amplifiers that can be mounted closer to antenna feeds. Used to be commonplace to have HPA (high power amplifier) rooms with waveguide plumbed all over the place at gateway earth stations, but now not so much. For user terminals everything is pretty much feed mounted and you don't see any external waveguide.
@oldhackee3915
@oldhackee3915 2 месяца назад
Wow that’s a lot of experience. Yes that’s a trend for sure. UHF television transmitters are good examples of use, but now with everything streaming, I wonder how long terrestrial broadcast will last. Thanks for the comments.
@douglasstrother6584
@douglasstrother6584 2 месяца назад
A crystal clear presentation
@oldhackee3915
@oldhackee3915 2 месяца назад
lol. Thank you. 😊
@douglasstrother6584
@douglasstrother6584 2 месяца назад
My lucky numbers: 75, 51, 28 & 15.
@douglasstrother6584
@douglasstrother6584 2 месяца назад
Ya got me: I didn't know that J.J. Thomson first though of waveguides!
@douglasstrother6584
@douglasstrother6584 2 месяца назад
Waveguide "Demystified" ... IT'S A TRAP!!
@BCarli1395
@BCarli1395 2 месяца назад
Thank you. This is very helpful.
@BCarli1395
@BCarli1395 2 месяца назад
Nano ohmmeter 😂
@oldhackee3915
@oldhackee3915 2 месяца назад
Glad it was helpful! Thanks for the comment.