Tutorial video on op amps (Common Emitter design Video 5) - Page 1
Forum section: electronics / beginners

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 24, 2013, 06:17:32 am
content: I am making some videos on electronic using the Sedra-Smith book as a guide. It is intented for my son who is taking his first EE circuit course at the University of Texas in San Antonio. I will be posting these videos on youtube so that he and his fellow students can have addition help in learning this subject.I will also be posting these videos on the EEvblog as well for those who are interested.Comments and questions are welcomed.Video number 1. How to analyze a non-inverting op amp circuit. First a intuitive approached is used to anlyze the circuit, then a formal derivation is performed for those who like math.Video number 2. Analysis of an inverting op amps circuit. First a intuitive approached is used to anlyze the circuit, then a formal derivation is performed for those who like math.Video number 3. This video shows the effect that the Open Loop gain has on an inverting circuit. As Ao (Open loop gain) is decreased, it introduces errors into the tranfer function that we all know as Vo= -(Rf/Ra)*Vin. This video show how to derive the general equation and how to use SPICE to simulate and verify the equation.Video number 4. (Input impedance and Ao effects Video 4)This video show how to calculate the input impedance of both an inverting and non-inverting op amp circuit. I then use SPICE to model and verify the derived equation and show how the Ao (Open loop gain) of the op amp effect the input impedance of the op amp circuit.Video number 5. This is an actual tutorial between my son and I on how to design a Common Emitter with a gain on 3.3. This is part of his EE circuit lab. I showed him some rule of thumb and then showed him how to simulate the circuit on TopSPICERobertRobert Bolanos

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 26, 2013, 06:22:59 am
content: Second tutorial video. The video is about the inverting Op Amps and how to derive its transfer function.

author: Mechatrommer
author_rank: Super Contributor
timestamp: January 26, 2013, 08:51:50 am
content: (thanks button)

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 28, 2013, 04:04:11 pm
content: Video number 3. This video shows the effect that the Open Loop gain has on an inverting circuit. As Ao (Open loop gain) is decreased, it introduces errors into the tranfer function that we all know as Vo= -(Rf/Ra)*Vin. This video show how to derive the general equation and how to use SPICE to simulate and verify the equation.Robert

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 29, 2013, 04:26:57 am
content: Video number 4. (Input impedance and Ao effects Video 4)This video show how to calculate the input impedance of both an inverting and non-inverting op amp circuit. I then use SPICE to model and verify the derived equation and show how the Ao (Open loop gain) of the op amp effect the input impedance of the op amp circuit.

author: codeboy2k
author_rank: Super Contributor
timestamp: January 29, 2013, 05:52:42 pm
content: Hey, just wanted to say thanks for putting up your videos, excellent content there and well presented..I only have 1 beef.. the digital audio compression is too much, it has a wiggly-wavy sound, and high-frequency 'S' sounds on the words (the 'SSS' sounds and popping 'P' sounds might be correctable with a compressor/limiter software during your recording)You can probably do it post-recording with a low pass filter and audio compressor (not digital compression, like mp3 compression, but audio compression/limiting).The ways it sounds now makes it hard to listen to for long periods.The content is great though. Thanks! I look forward to your next videos.Cheers!

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 29, 2013, 08:10:38 pm
content: Hi Codyboy2KYes the audio sucks. I got complaints of hissing and I then tried the digital compression you mentioned. Now I sound like Darth Vader; Luke I am your fatherI originally had the microphone in the front panel and then moved it to the back. Maybe I need a sound card? Maybe a new computer. I am using Corel Visual Studio. I see if it has some noise filter that I can use.Thank you for letting me know about the sound quality! I will see if I can improve itRobert

author: ampdoctor
author_rank: Frequent Contributor
timestamp: January 30, 2013, 03:28:23 am
content: use a vacuum tube mic preamp and you'll clean that audio right up!...lights fuse and runs like hell!Sorry I couldn't resist.seriously though, I didn't find the audio in any way objectionable. the content is what matters and not if the sound is off by a hair...and the content is excellent. don't worry too much about it.

author: rbola35618
author_rank: Frequent Contributor
timestamp: January 30, 2013, 03:58:56 am
content: Thank you kindly for the comments gentlemen.Robert

author: codeboy2k
author_rank: Super Contributor
timestamp: February 01, 2013, 09:44:58 am
content: Quote from: ampdoctor on January 30, 2013, 03:28:23 amand use Monster branded cables of courseHowever, these days, Monster cables are so ghetto...You need ...Nordost ODIN Supreme Reference Cables – $20,000"...uses twenty-four 20 AWG conductors made from 99.99999% oxygen free copper (OFC) with an extrusion of 85 microns of silver on the surface. Each conductor is wound with a helical “Dual Mono-Filament” of Fluorinated Ethylene Propylene (FEP) with an extruded FEP jacket. The careful matching of conductors with a very high degree of concentricity and precision in the manufacturing process results in a cable of superb sonic performance"

author: SeanB
author_rank: Super Contributor
timestamp: February 01, 2013, 02:52:21 pm
content: I have been stripping some old cable similar to that and turning them into test leads. Nice silver plated copper with a PTFE sheath, and pretty nice cable. Makes a great test lead, at least if it contacts the soldering iron nothing happens.

author: codeboy2k
author_rank: Super Contributor
timestamp: February 02, 2013, 11:25:37 pm
content: nice.For test lead usage, the silver plating will help lower the overall resistance of the wire too (but not by much ... the few microns of silver around all that copper probably has a higher resistance than the copper does, but the parallel combination will lower the resistance slightly)I guess the second reason people like silver on copper is to prevent corrosion (but that takes 10's of years or more, unless you are on a boat)and of course the skin effect if your working with HF signals....

author: rbola35618
author_rank: Frequent Contributor
timestamp: February 09, 2013, 02:05:44 am
content: Video number 5. This is an actual tutorial between my son and I on how to design a Common Emitter with a gain on 3.3. This is part of his EE circuit lab. I showed him some rule of thumb and then showed him how to simulate the circuit on TopSPICERobert