Good stuff. I have made a ton of transistor related circuits playing with wave form outputs. I learned a lot playing with resistance and capacitance making many wave forms. For instance I would take a single pulse and make it a sawtooth, or a sine wave or a longer or shorter pulse all with a couple of teansistors. Its amazing how we can take one signal and modify it to get our desired output. This circuit you have reminds me of the lightening detector I built. I wanted the sharp small pulse of the lightening to last a bit longer for a better visual effect on the LED strip, so I spent an hour or so getting it tuned to look nice visually with a very similar circuit stretching out the duration of the pulse. It came out nice. Its an LED lightening bolt on the wall, and when lightening is anywhere within 5 to 10 miles from the house it starts blinking in time with the actual lightening outside. At first it was too fast, i wanted it to fade out, and last a bit longer so thats where this part of the circut came in. Its a neat project you can add to this circuit to get a nice visual indication of local weather.
@TheEngineeringExperienceYT it's just an antenna with a tuned circuit of coil and capacitor for a resonance around 5khz and then multiple transistors to amplify and lengthen the pulses detected. The output is a small section of LED strip. So when the 5khz bursts resonate the antenna it detects and lengthens the pulses and applys the voltage to the LED strip. You can find many similar circuits online. But I wanted the challenge of trying to build it myself so I did the calculations and used the parts I had to make it work. It's a fun project.
Great! Subscribed and will join.😊 I didn't notice the book photo at beginning of your videogram as it was only shown briefly, eventually discovered that you are referring to "The Art of Electronics 3rd Edition" manual (not the "Learning the Art of Electronics hands-on manual). And your first diagram refers to page 78. Noting other peoples' comments, I should say that my TAOE books have been sitting unused for some time, and it is great that your videograms encourage me to dust them off and use them again. Thank you ! 😊❤😊
Thank you for the video. One of my favorite classes in college was this lab with Tom Hayes...over 30 years ago now. Your video brings back some good memories. Very clear explanations. If I might make a comment, I would have liked you to return to the example of setting R5 to 100k to see that while you do improve the output voltage level then you need a much higher beta for Q5--emphasizing the tradeoffs (if I have that right). I'm jumping in in the middle as I just saw the article on hackaday, so don' know if you covered it before but yes more transistor theory would be great as well as more discussion about how the output pulse length is determined by component values--maybe you did that in another video. I look forward to watching more.
Thanks for the feedback. The previous video has pulse width calculation and what components contributes towards it (exercise 2.2). Good point on the beta calculation for a higher resistor to round of the trade off discussion!
TAE is amazing books serie( book 2 is a top) but make a vid about is the "amazing" ....thank u sir....as always say "if u want to know something in electronic build it"
To get a transistor in full saturation a safe rule of thumb is to have a Ib 10 times higher than is needed. That would make the beta required 240. Remember that when a transistor is in saturation the collector voltage is 0.1V. With a base voltage of 0.7V part of the base current does not only flow to the emitter but also to the collector. Therefore a safety factor of 10.
In order to achieve a full zero to +5V swing at the output, I could try using a logic level, enchancement mode (N-channel) MOSFET. By doing so, loading effects would be negligible during steady state conditions
You can certainly do that but I dont you should make the circuit more complicated if you don't need to. Doing a calculation for minimum beta should be sufficient. There are alternatives that I will speak about and discuss in a future video.
It can be. But it doesn't matter for the circuits. The input signal can come from anything, like a microcontroller, a push button or something else. The circuit need to the input to go high in order to saturate Q1 and ground the charged capacitor.
Stefan-Boltzmann Equation is in cm so convert all numbers to cm. 1 ft diameter cable 30.48 cm 26.45 ft cable length is 806.196 cm Then calculate radiating surface area A. Radiating surface area = (2 × pi × r) × h) or (pi * d * h) pi * 30.48 * 806.196 = 7.72^x10^4
It's a questions from art of electronics. Excel is to calculate the answer by analysis putting in a simulation and getting everything wouldn't be in the spirit of the question/learning. Yes, LTSpice is useful for analysis and we did that in the previous video for pulse generator 1 from art of electronics.
The typical 555 schematic is way less intuitive than the knobs on a benchtop signal generator, which is therefore the better solution. Or you can just get the answer from an oscilloscope! 🙃
Definitely! For circuit it is useful and I will make a video on it but to answer a question I don't think it's quite in the spirit of answering the question.
Thanks for the video. If you understand how these transistor circuits work... why use the "Art of Electronics' for a videod. IMO... though it was quite a 'popular' book... it's quite outdated. Again... IMO... the "Art of Electronics" ... whatever edition... only survives.. because of it's cult like status... among those who thing it can 'explain' or 'teach' them electronics... a sort of 'short cut'... if you like... that wasn't a justified belief, when the book came out... and isn't justified now.
Thank you for watching, the circuit and question is directly from the book. I do these videos for my own learning and the fact there is not an official solutions to these questions. I think as community we can learn electronics from these questions and develop understanding. I've never heard anyone say it's a shortcut for learning electronics. It is one of the books that gets recommended commonly. There are other books and I will be making videos on them as well
@@test143000 Disagree. Modern BJT has better parameters, tighter parameters, and better datasheets. Maybe BJTs from 30 years ago work the same way now that they did 30 years ago; but that is not necessarily true.
@@TheEngineeringExperienceYT That's not my point. We did plenty of these kind of questions in undergrad. Some questions are very good, for increasing understanding... and some questions are much better than very good, for increasing greater understanding. It's the prof that picks those kinds of questions... if one had that kind of prof.
Good stuff. I have made a ton of transistor related circuits playing with wave form outputs. I learned a lot playing with resistance and capacitance making many wave forms. For instance I would take a single pulse and make it a sawtooth, or a sine wave or a longer or shorter pulse all with a couple of teansistors. Its amazing how we can take one signal and modify it to get our desired output. This circuit you have reminds me of the lightening detector I built. I wanted the sharp small pulse of the lightening to last a bit longer for a better visual effect on the LED strip, so I spent an hour or so getting it tuned to look nice visually with a very similar circuit stretching out the duration of the pulse. It came out nice. Its an LED lightening bolt on the wall, and when lightening is anywhere within 5 to 10 miles from the house it starts blinking in time with the actual lightening outside. At first it was too fast, i wanted it to fade out, and last a bit longer so thats where this part of the circut came in. Its a neat project you can add to this circuit to get a nice visual indication of local weather.
Thank you for the comment.
That project sounds amazing! What did you use for lightening detection?
@TheEngineeringExperienceYT it's just an antenna with a tuned circuit of coil and capacitor for a resonance around 5khz and then multiple transistors to amplify and lengthen the pulses detected. The output is a small section of LED strip. So when the 5khz bursts resonate the antenna it detects and lengthens the pulses and applys the voltage to the LED strip. You can find many similar circuits online. But I wanted the challenge of trying to build it myself so I did the calculations and used the parts I had to make it work. It's a fun project.
If you don't mind, I'll make it as a project on this channel. Should be fun!
Thanks for the information.
@@newmonengineering Thanks, I will have a look at some reference circuits.
Great! Subscribed and will join.😊
I didn't notice the book photo at beginning of your videogram as it was only shown briefly, eventually discovered that you are referring to "The Art of Electronics 3rd Edition" manual (not the "Learning the Art of Electronics hands-on manual).
And your first diagram refers to page 78.
Noting other peoples' comments, I should say that my TAOE books have been sitting unused for some time, and it is great that your videograms encourage me to dust them off and use them again.
Thank you ! 😊❤😊
Thanks! Hope you enjoyed the content. Hopefully we can solutions to all the questions in the book.
Exercise 2.4 coming tomorrow... hopefully!
Thank you for the video. One of my favorite classes in college was this lab with Tom Hayes...over 30 years ago now. Your video brings back some good memories. Very clear explanations. If I might make a comment, I would have liked you to return to the example of setting R5 to 100k to see that while you do improve the output voltage level then you need a much higher beta for Q5--emphasizing the tradeoffs (if I have that right). I'm jumping in in the middle as I just saw the article on hackaday, so don' know if you covered it before but yes more transistor theory would be great as well as more discussion about how the output pulse length is determined by component values--maybe you did that in another video. I look forward to watching more.
Thanks for the feedback.
The previous video has pulse width calculation and what components contributes towards it (exercise 2.2).
Good point on the beta calculation for a higher resistor to round of the trade off discussion!
Thank you for sharing
Thanks for watching!
Thank you for taking the time, love to learn something new.
No problem, thank you for watching.
TAE is amazing books serie( book 2 is a top) but make a vid about is the "amazing" ....thank u sir....as always say "if u want to know something in electronic build it"
Definitely! Building circuits reinforces learning very well.
Thanks 🙏👍💯😊
No problem, Thanks for watching!
To get a transistor in full saturation a safe rule of thumb is to have a Ib 10 times higher than is needed. That would make the beta required 240.
Remember that when a transistor is in saturation the collector voltage is 0.1V. With a base voltage of 0.7V part of the base current does not only flow to the emitter but also to the collector. Therefore a safety factor of 10.
In order to achieve a full zero to +5V swing at the output, I could try using a logic level, enchancement mode (N-channel) MOSFET. By doing so, loading effects would be negligible during steady state conditions
Good idea. I think that would work!
Or use Darlington transistor with VAR POT to adjust Ic of Q3.
You can certainly do that but I dont you should make the circuit more complicated if you don't need to. Doing a calculation for minimum beta should be sufficient.
There are alternatives that I will speak about and discuss in a future video.
thanks man
Thanks for watching
+5Vcc and input of Q1 are connected to each other? i don’t know what is step input is?
It can be. But it doesn't matter for the circuits. The input signal can come from anything, like a microcontroller, a push button or something else.
The circuit need to the input to go high in order to saturate Q1 and ground the charged capacitor.
thank you so much...!”
No problem
i want to ask from the exercise 1.6, where did we get 7.72x10^4 and what is the unit measure of it? it is question c.
Stefan-Boltzmann Equation is in cm so convert all numbers to cm.
1 ft diameter cable 30.48 cm
26.45 ft cable length is 806.196 cm
Then calculate radiating surface area A.
Radiating surface area = (2 × pi × r) × h) or (pi * d * h)
pi * 30.48 * 806.196 = 7.72^x10^4
thank you..!”
No problem
LT spice works better than spreadsheet. If you want pulse, you should look after NE555 this schematic pattern is more obvious for anybody.
It's a questions from art of electronics.
Excel is to calculate the answer by analysis putting in a simulation and getting everything wouldn't be in the spirit of the question/learning.
Yes, LTSpice is useful for analysis and we did that in the previous video for pulse generator 1 from art of electronics.
The typical 555 schematic is way less intuitive than the knobs on a benchtop signal generator, which is therefore the better solution. Or you can just get the answer from an oscilloscope! 🙃
Haha
Knobs on a signal generator are a lot less intuitive than just holding a push button for however long you want the pulse.
This user could have been considered as a cheater by viewers if he had used LTspice for this vid 😅
Definitely! For circuit it is useful and I will make a video on it but to answer a question I don't think it's quite in the spirit of answering the question.
Thanks for the video. If you understand how these transistor circuits work... why use the "Art of Electronics' for a videod. IMO... though it was quite a 'popular' book... it's quite outdated. Again... IMO... the "Art of Electronics" ... whatever edition... only survives.. because of it's cult like status... among those who thing it can 'explain' or 'teach' them electronics... a sort of 'short cut'... if you like... that wasn't a justified belief, when the book came out... and isn't justified now.
Thank you for watching, the circuit and question is directly from the book. I do these videos for my own learning and the fact there is not an official solutions to these questions.
I think as community we can learn electronics from these questions and develop understanding.
I've never heard anyone say it's a shortcut for learning electronics. It is one of the books that gets recommended commonly. There are other books and I will be making videos on them as well
Outdated in what? Transistors do not work the same way it was 30 years ago?
Agreed, the questions is very good for understanding more about BJT operation (and RC network).
@@test143000 Disagree. Modern BJT has better parameters, tighter parameters, and better datasheets. Maybe BJTs from 30 years ago work the same way now that they did 30 years ago; but that is not necessarily true.
@@TheEngineeringExperienceYT That's not my point. We did plenty of these kind of questions in undergrad. Some questions are very good, for increasing understanding... and some questions are much better than very good, for increasing greater understanding. It's the prof that picks those kinds of questions... if one had that kind of prof.