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Adventures in learning and designing analog electronics!
Negative resistance and the Negative Impedance Converter
What does chaos theory, load cancellation, and op amps all have in common? This video discusses negative resistance, provides an introduction to negative impedance converters, and demonstrates some of the interesting circuits that use it.
References and a derivation of the negative impedance converter circuit's input resistance: www.analogzoo.com/2018/01/negative-impedance-converters/
References and a derivation of the negative impedance converter circuit's input resistance: www.analogzoo.com/2018/01/negative-impedance-converters/
Переглядів: 26 795
Відео
Practical RF Filter Design and Construction
Переглядів 125 тис.7 років тому
An introduction to practical RF filter design by building, testing, and tweaking a 137MHz bandpass filter suitable for NOAA APT satellite reception. Additional references and reading materials at: www.analogzoo.com/2017/03/practical-rf-filter-design
A Faux-Intelligent Voice Activated Light Switch
Переглядів 9 тис.7 років тому
Build fun circuits! Impress your friends! (Or at least the ones who aren't in-the-know ;) Here's a voice-activated light switch that provides the illusion of a more advanced artificial intelligence, with the simplicity of "the clapper". www.analogzoo.com/2016/10/a-voice-activated-light-switch/
Review/Teardown of the new MHS5200A
Переглядів 13 тис.7 років тому
I've gotten a lot of questions on my blog about the new version of the MHS5200A function generators available on eBay. Viewer Tolga was kind enough to send one in to me to review and tear down. Although some improvements have been made over the older models, there are some concerning issues with these new models too!
Photodiode/Transimpedance Amplifier Design
Переглядів 67 тис.7 років тому
I recently designed an infrared sensor board (dubbed "IRis") for my friend's Defcon talk (defcon-wireless-village.com/speakers.html#blinded_by_the_light). This video walks through the photodiode amplifier circuit design, and discusses some of the pitfalls associated with photodiode amplifier design. References and additional reading: www.analogzoo.com/2016/08/photodiode-amplifier-design/
Fun With Analog Multipliers: Squares, Cubes, and VCAs
Переглядів 25 тис.8 років тому
Need a frequency doubler? Want to plot a cubic function on your 'scope? How about a square root extractor, or a voltage controlled amplifier? Analog multipliers like the AD633 make all this (and more) a snap! www.analogzoo.com/2016/06/fun-with-analog-multipliers
Quartz crystal motional parameters, and how to measure them
Переглядів 19 тис.8 років тому
A discussion on crystal motional parameters and how to measure them using a Saunders 150B crystal impedance meter, plus some hard data on the typical motional parameters and Q values of over 150 crystals ranging from 1-40MHz. Raw data and some additional stats at: www.analogzoo.com/2016/05/crystal-motional-parameters/
Solving Mazes With Analog Computers
Переглядів 13 тис.8 років тому
Here's a very simple analog circuit that solves the shortest path between two points in multi-path maze. All you need are some LEDs and a current source! For references and additional reading: www.analogzoo.com/2016/04/analog-computing-shortest-path/
Building a 28.8MHz TCXO for the RTL-SDR
Переглядів 33 тис.8 років тому
A 28.8MHz RTL-SDR TCXO that's easy to build, and designed entirely from readily available and inexpensive components. Schematics and project files: www.analogzoo.com/2016/03/building-a-better-rtl-sdr-tcxo/
Oscillator Simulation and Design (with Genesys)
Переглядів 13 тис.8 років тому
Today we explore the use of oscillator synthesis software (Genesys) for practical crystal oscillator design, and the impact of the Randall-Hock correction formula on linear open loop analysis accuracy. References and additional reading: www.analogzoo.com/2016/03/oscillator-simulation-and-design
A 100kHz Zero Droop Precision Peak Detector
Переглядів 30 тис.8 років тому
Here's an inexpensive precision peak detector circuit that accurately tracks the peak voltage of input signals at frequencies up to 100kHz and has zero voltage droop over an indefinite period of time...no microcontrollers required! Additional references and schematics can be found at: www.analogzoo.com/2016/02/a-100khz-zero-droop-peak-detector/
Single Supply Precision Rectifier Design and Optimization
Переглядів 19 тис.8 років тому
An introduction to single-supply precision op-amp rectifier circuits, their inherent limitations, and optimizations to reduce output distortion at higher frequencies. Blog post with schematics, references, and additional reading: www.analogzoo.com/?p=1361
Precision Op Amp Rectifier Circuits
Переглядів 52 тис.8 років тому
An introduction to using operational amplifiers for precision half-wave and full-wave rectification of AC signals: How it works, how to configure the circuits for gain/attenuation, and the effects of op-amp slew rate and resistor matching on the precision of the rectified signal.
Building a Window Comparator With a Single Op-Amp
Переглядів 51 тис.8 років тому
Here's how to build a window comparator that detects three different voltage levels with just one op-amp! www.analogzoo.com/?p=1330
Jim Williams' Test Your Analog Design IQ #8
Переглядів 67 тис.8 років тому
It’s time for another Jim Williams analog IQ test! Today we examine the design, operation, and limitations of a simple voltage to frequency converter. Blog post: www.analogzoo.com/?p=1269
Detecting a Saleae Logic Analyzer on Your Data Bus
Переглядів 18 тис.8 років тому
Detecting a Saleae Logic Analyzer on Your Data Bus
Colpitts Crystal Oscillator Fundamentals
Переглядів 154 тис.8 років тому
Colpitts Crystal Oscillator Fundamentals
Passive and Active (Sallen-Key) RC Filter Operation and Design
Переглядів 28 тис.8 років тому
Passive and Active (Sallen-Key) RC Filter Operation and Design
Tektronix 485 Troubleshooting and Repair
Переглядів 34 тис.8 років тому
Tektronix 485 Troubleshooting and Repair
Jim Williams' Test Your Analog Design IQ #14
Переглядів 17 тис.8 років тому
Jim Williams' Test Your Analog Design IQ #14
Hardware Hacking Presentation 2015-09-09
Переглядів 2 тис.8 років тому
Hardware Hacking Presentation 2015-09-09
Jim Williams' Test Your Analog Design IQ #17
Переглядів 20 тис.8 років тому
Jim Williams' Test Your Analog Design IQ #17
Jim Williams' Test Your Analog Design IQ #22
Переглядів 54 тис.8 років тому
Jim Williams' Test Your Analog Design IQ #22
MHS5200A Part 2: The Importance of Slew Rate
Переглядів 8 тис.8 років тому
MHS5200A Part 2: The Importance of Slew Rate
Great presentation. Thank you. What about slew rate at 14 Mhz ? What do I use for an op-amp ?
Amazing! Thank you so much for taking the time to do these videos.
What about capacitors type resistors types
Thank you for the info 👍👍
Not bad, but have you considered replacing the crystal in an exsiting TCXO? The cheap ones just seem to have an HC-49 package in them.
The single transistor Delta-Vbe trick is interesting, thanks for sharing!
Very helpful video... either for my English listening pratice and for make my own oscillator too !!! Thanks for it !!!
The most clear explanation I've ever seen, thanks! However it would be worth to tell a bit about the constellations.
I initially thought it would be due to the trace parasitic inductance from the 15V supply to the collector of the transistor which formed an LC oscillator with the collector-emitter parasitic capacitance. If all else would have failed I'd have added a ferrite bead around the pin of the base.
So Much Bnc Connectors
Yes indeed, who told diodes how to do trig haha. Very nice explanations. We can do wonders by cleverly connecting a few simple components
Brilliant thank you
Is there any way to make these filters have a sharper curve? There are some strong VDL2 blips on 136.7 MHz that overload the SDR, Meteor LRPT is much more affected as each time these blips appear the meteor demodulation loses sync. Or is there a way to make a notch filter with a similar design?
good
I don't really understand how the concept of ensuring that the series equivalent resistance being smaller than the internal resistance of the crystal degrades the high Q of the crystal? Why does that condition need to be met??
nice
What if the paths were filled with a conductive substance and a thermal camera looking at it from above would show the path of most current?
Is there a detailed schematic for this?
Hi, why coupling the oscilator with the capacitor and resistor divider and not directly ?
This is really cool, tank you!
Great video!
Do Sallen-Key active filters work at HF frequencies 3-30Mhz ?
Well, now I know that the AD633JN frol Aliexpress that I bought are fake, those only heat up and do nothing. Very helpful video.
Do you have suggestion what op amp ic that perform good with this circuit?
We can use this type of filter on tx as well?
Note: one doesn't absolutely need precision resistors - 1 trimpot used in the feedback loop of the rectifier opamp *or* one trimpot to adjust the input weights into the inverting adder is enough to balance out any error in the other resistor pair.
What’s the bandwidth of this mixer? What frequencies can it handle?
120 kHz? Mentioned at 31:47.
Is the plane made of PTFE?
I don’t think the explanation of the mixing in the beginning is really accurate. It’s rather mathematically involved specially in an analog environment.
Beautiful. But the coils are coupling. Place them in 90 degress to each other ...
Hi how can we apply this on gnss? lower band (from 1164 MHz to 1300 MHz) and the upper band (from 1559 MHz to 1610 MHz). Each band has multi channels.
This is very good! Thank you for taking the time to do this video you are a very good teacher!
Excellent! Thank you.
Your analogy starting around ~1:25 is one that would have confused me back when I was in school. Mainly the fact that you're using a digital device to describe analog behavior, and if when I was new to the topic it may not have been obvious why or where your analogy breaks down(Or I might not recognize it as an analogy and take it very literally), or even that you really intended to discuss analog signals and not digital. Just my 2 cents.
bro, you made this whole video, and your supposed example is utter trash which you showed for less than a minute. thumbs down, fraud.
your frequent smacking of your lips after finishing a sentence is an annoying attempt to portray confidence.
These are at the exact level I require. Thank you so much for taking the time.
Wow. I've been using this exact configuration for crystal oscillators for decades without ever really understanding it, & this is the first explanation I've ever seen that's ever made sense to me. Thank you so much!
why can't any of my profs just fucking say this. Good lord you make this easy. Well done.
hey your blog domain expired. move to blogspot
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This video just started playing out of nowhere while i was replying to comments. I wansnt even watching anything to begin with. It’s wild because it’s exactly what I needed to know. Im building a radio. Right now im trying to amplify 4mhz active crystal and its not working. The crystal by itself is louder than adding a transistor or fet. I didn’t play around too much with bias and I didn’t do any filtering. I used an antenna and resistor or i used a transformer and antenna, I even just shorted it with antenna. I figure it should at least be louder than the crystal even if poorly implemented but maybe not. Another round of testing today. Maybe the chips im using can’t handle 4mhz but I didnt think that was particularly fast for a run of the mill semiconductor pulled from old monitors. Today ill try making my own oscillator I guess. Also would help if i had my 50mhz scope.
Book name please
👍Nice demo, thanks. Well presented and straight to the point.
Use a design tool, or calculate it yourself, to do predistortion when you design to take into account the L/R ratio of the inductors. Results may be better.
Great video, but sadly they are far from cheap. Nowadays they cost 14 $ a piece. For people around where i live, cheap is below 1 $. But anyway, it's good to know these things exist. Thanks for the video.
Wow. This is badass shit! Thanks!
Link in your description is unaviable. Could you tell parametres of all used elements or redirect to enabled source for information?
Thank you very much for this video, just got a clean 16 MHz sinewave from my first colpitts oscillator :)