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Old Hack EE
United States
เข้าร่วมเมื่อ 3 ก.ค. 2022
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.
Infinite Gain Multiple Feedback Filter Design
Welcome to the Active Filter Series. This video shows what I think, is a better way to design, infinite gain, multiple feedback, active filters.
00:00 Intro - Previous Videos
02:21 Slew Rate and Gain Bandwidth Considerations
03:12 Low-Pass Filter Design
06:19 High-Pass Filter Design
08:49 Band-Pass Filter Design
00:00 Intro - Previous Videos
02:21 Slew Rate and Gain Bandwidth Considerations
03:12 Low-Pass Filter Design
06:19 High-Pass Filter Design
08:49 Band-Pass Filter Design
มุมมอง: 181
วีดีโอ
Infinite Gain Multiple Feedback Specific Transfer Functions
มุมมอง 255หลายเดือนก่อน
Welcome to the Active Filter Series. In the last video, I derived the generalized transfer function, for the infinite gain multiple feedback filter. We can use that function, to generate a specific transfer function, in this case the low-pass, high-pass, and band-pass filter configurations. I’ll just be replacing the general impedances, with resistance or the capacitance in Laplace form. In a l...
Infinite Gain Multiple Feedback General Transfer Function
มุมมอง 284หลายเดือนก่อน
Welcome to the Active Filter Series. The video is about the infinite gain, multiple feedback, active filter. I will derive the generalized transfer function, for the multiple feedback topology. I will later replace the generalized impedances, with the appropriate impedances, for the different types of filters, low pass, high pass, etc. 00:00 Intro 00:42 Infinite Gain Multiple Feedback Filter To...
New Excel Tips and Tricks - Waveguide Workbook (4k Video)
มุมมอง 104หลายเดือนก่อน
Welcome to electrical engineering with Excel. This is my 20th video about Excel, and its amazing use in electrical engineering. If you have watched the previous videos in this playlist, you would find various methods of use. This video features some new tips and tricks, you may find useful in your spreadsheets. Since I just finished up 2 videos on waveguides, I decided to use these tips and tri...
Decibels for Dummies (4k Video)
มุมมอง 5072 หลายเดือนก่อน
Welcome to the basics series. One of the most fundamental concepts in electronics, is the decibel, as well as other areas. It’s a logarithmic measurement form, that yields numbers, that can span very small values, to very large values. It also replaces multiplication with addition.
Waveguide Power Handling (4k Video)
มุมมอง 3523 หลายเดือนก่อน
I recently posted a video called “Waveguide Demystified”. But I didn’t discuss anything, about the waveguide’s capability to handle power, other than the narrow wall dimension matters for power handling. Theoretical formulas, are available for waveguide power handling, but derating must be done, because the formulas are theoretical, and assume perfect waveguide conditions. 00:00 Intro 00:35 Pow...
Waveguide Demystified (4k Video)
มุมมอง 17K3 หลายเดือนก่อน
This video will cover some basics, about waveguide practical applications, and hopefully demystify the theory of operation. Most electromagnetic textbooks, show the equations for all the modes possible in waveguide. In the industry, only one mode is in dominant use, generally. Hopefully this video will help you understand waveguide operation, intuitively. 00:00 Intro 00:35 What is Waveguide 01:...
Guitar Pickup Signal Injector
มุมมอง 5434 หลายเดือนก่อน
This video covers an electronic project, that will inject a square wave signal, into a guitar pickup, using electromagnetic induction, for testing purposes. 00:00 Intro 00:34 Checking Pickups With a Screwdriver 00:52 Using Square Wave as Test Signal 01:12 555 Timer as the Square Wave Generator 03:11 Faraday's Law of Electromagnetic Induction 04:08 Box Construction 05:02 Test Demo Project Box ww...
Best Fit Voltage Divider (4k Video)
มุมมอง 3405 หลายเดือนก่อน
Welcome to electrical engineering with Excel. In this video, we will look at some Visual Basic for Applications user defined code in Excel, to select the best fit resistor values for a voltage divider. This is only for the selection of 1% tolerance resistors. Although 1% tolerance is good, arbitrary selection of values can result in the divider’s output being less precise than it could be. Let ...
Loaded Voltage Divider (4k Video)
มุมมอง 3655 หลายเดือนก่อน
Welcome to the BASICS series. One fundamental part, of learning the most basic electronic circuit analysis, involves the voltage divider rule. Most textbooks explain this, as a circuit of two resistors in series, with the output not connected to anything. Many circuit applications, will have the output going to the input of an opamp, voltage comparator, or some other circuit, with an input impe...
A Little About Crystals (4k Video)
มุมมอง 14K6 หลายเดือนก่อน
Crystals have been a major contributor to the electronic revolution that has taken place for the last 100 years. This is especially dominant in the area of wireless communications that, without crystal-controlled transmission, radio and TV - would not be possible in their present form. 00:00 Intro 01:07 Quartz Used By Mother Nature First 03:07 What is Quartz? 03:37 Piezoelectric Effect 04:15 Th...
A Peek Inside the Operational Amplifier (4k Video)
มุมมอง 2.2K6 หลายเดือนก่อน
Welcome to the video series The Operational Amplifier - From Abstraction to Reality. Operational amplifiers are the workhorse of the analog industry. It is straightforward for the engineer to design circuits by using a set of assumptions about the device, and therefore using simple formulas to calculate the values of the surrounding components. However, in the real world, there are limitations ...
Astable With Duty Factor (4k Video)
มุมมอง 8456 หลายเดือนก่อน
Welcome to the comparator series. On the last video, we looked at an astable multivibrator circuit using a comparator. It was a very simple circuit, which lends itself to a natural duty factor of 50%. This video covers an alternate circuit that allows for any duty factor. Download Spreadsheet from Github github.com/oldhackEE/Electrical-Engineering-With-Excel/blob/3869c72980bc61528c3084ac5219a9f...
Astable Multivibrator Using a Comparator (4k Video)
มุมมอง 3536 หลายเดือนก่อน
Welcome to the comparator series. In this video we will look at using a comparator, for use as an astable multivibrator, or what’s commonly called an oscillator. 00:00 Intro 01:23 Quad Comparators 01:45 Astable Operation 03:17 Capacitor Charging Formula 05:35 Calculation of the Period & Frequency 06:30 Component Selection
Capacitor Charging Equation (4k Video)
มุมมอง 3047 หลายเดือนก่อน
Welcome to the Mental Exercises series. There are certain engineering problems, that require calculus to solve, but in some cases, the problem only needs to be solved once. This is the case for the capacitor charging equation. You have likely seen this equation, but I thought it would be fun to derive it, from the most basic grassroots, with the definition of capacitance and electric current.
Comparator Hysteresis Spreadsheet (4k Video)
มุมมอง 2167 หลายเดือนก่อน
Comparator Hysteresis Spreadsheet (4k Video)
Nonlinear Curve Fitting With The LINEST Function
มุมมอง 4219 หลายเดือนก่อน
Nonlinear Curve Fitting With The LINEST Function
Comprehensive Comparator Hysteresis Design
มุมมอง 4149 หลายเดือนก่อน
Comprehensive Comparator Hysteresis Design
Stop Selecting Arbitrary Resistors for Hysteresis
มุมมอง 2K10 หลายเดือนก่อน
Stop Selecting Arbitrary Resistors for Hysteresis
Sallen-Key Component Calculator Spreadsheet
มุมมอง 22210 หลายเดือนก่อน
Sallen-Key Component Calculator Spreadsheet
Root Mean Square of a Sinusoid - With Derivation
มุมมอง 274ปีที่แล้ว
Root Mean Square of a Sinusoid - With Derivation
Lumped Element Filter Design - A Crash Course
มุมมอง 736ปีที่แล้ว
Lumped Element Filter Design - A Crash Course
Foolproofing Excel Engineering Workbooks
มุมมอง 352ปีที่แล้ว
Foolproofing Excel Engineering Workbooks
"Imagine the conducting wires as bus bars that don't actually exist" HA!
Hi sir could you please make a video on ADC and its interfacing circuit
I’ll look into it.
What I use is my smartphone loudspeaker. Once it is close enough to the pickups, whatever plays through the loudspeaker is received by the pickups.
Very cool.
Thank you SO MUCH for this video. I have been looking for this explanation for WEEKS. Great video!
Glad it was helpful!
Thank you
Thank you!
4:50, that jump to the quarter wavelength stub was jarring. I see how you were using it as a transitory, and I like how you use this as a kind of lemma to explain waveguides, but I had to rewatch it a few times to make sure I respected the explanation. If I understand correctly, the reason we have the stub was to attenuate all signals that aren't at that frequency (or integral modes thereof) and set the junction point to 0V (via a standing wave) if they are.
Yes that’s a good way to put it.
Excellent!
Thank you! Cheers!
Hi, how to change(transform) L and C for printed board circuit? Like, how to calculate length and width?
I’ve seen it done, but I haven’t done it
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)?
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.
Can you explain formula used in excel
I just digitized the graph from that design guide and let excel display trend lines with equations and used those in excel.
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.
Thank you. No, I do not.
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.
Thanks. I don’t understand what you are saying. I drew it the same way most textbooks do.
infinite thanks sir, best videos for the next generation of electrical engineering students
Thanks so much.
@@oldhackee3915 btw sir can you make videos about S parameters of active components ?
Are you talking about scattering parameters of microwave components or the Laplace s shorthand?
@@oldhackee3915 the scatterin params sir
I’ll consider it. Thanks
That was so good, I watched it twice! Many thanks, this is really great.
Thanks so much
Excellent!!! Could you please make a video on ADC or DAC interfacing circuit with opamp
All video is best learn yu video आपका हम आभारी हैं
Thank you
Eagerly waiting for new video
Another is coming soon.
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?
Indeed. I found the Wikipedia page to help me understand. en.m.wikipedia.org/wiki/Paschen's_law
Sir, pls share the link of spreadasheet.
I added a link to the spreadsheet in the description on all 5 videos. It was originally only in part 5.
Thank u so much.
Thanks for the comment.
Pls upload move vids.
Please do more opamps vids.
What kind would you like outside of all the ones I have already done?
Thank u sir.
Thanks for the comment.
Thank u sir.
Thanks for the comment.
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?
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.
Thanks man, u saved me !
Great to know. Thanks for your comment.
Outstanding
Thanks so much.
POTENTIOMETER senses Voltage Potential 😊😊
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.
Thanks so much for the comment. I’m glad that it was clear.
Thank you Sir for your excellent video. It helped me a lot in finding an oscillation problem on my new linear power supply design.
Glad it helped. Thanks for the comment.
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 👍
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.
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." ???
Yes I’m sure there were a lot of places I could have spoke better words in these videos. Thanks for pointing that out.
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
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.
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.
@@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.
Look-up Hatch & Williams regarding Multipaction.
Thanks for the comment.
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.
Thanks for the comment. That sounds interesting.
If the capacitance not change and dielectric looses not going to be mutch higher than as air use as insulator.
@@Duracellmumus So does that mean we can't use wave guides in the vacuum of space without the dielectric of air?
Thank you for your great videos!!
Thanks very much.
Please upload some analog stuff 😊
Too much microwaves for you?
@@oldhackee3915 There's never *too much* microwaves!
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!
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.
Sorry. Wish it would have been more helpful.
A glass rod is just a waveguide for THz RF ùwú
I used to build and test 4 port c band rotary waveguide switches...amongst others.
Very cool. Thanks for sharing.
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?
Thanks for the comment. I believe the only thing wrong you can do is overpower it.
o wow. jus found ur channel. very cool stuff
Thanks so much.
👏👏👏🔝👍
Thank you.
@@oldhackee3915 😊😊👋
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.
Thanks so much for the comment. That's great information. Thanks for sharing.
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?
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.
Immensely insightful, thank you so much ❤❤
Thanks so much.
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!
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.
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.
Thanks.
This explains so many things and adds new questions to my understanding, thankyou
Thanks.
Thank you.
You're welcome!
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.
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.