Not far out ! it is a semiconductor in reverse biased mode breaking down or in 'Avalanche' condition. Even Zener's have this reverse breakdown effect and it operates after the Zener breakdown so you (hopefully !) never see it, you just see the desired Zenner goodness.
@@andymouse Yes but you can't use a zener in this circuit as it does not break down in the same way, it just maintains the zener voltage. You need something with hysteresis to make this work
Thats my point, the Zener voltage is sustained as the device is doing what its supposed to do. But a Zener will experience an 'Avalanche' breakdown as well if you push it further in reverse beyond the Zener breakdown. Just to show a simple reverse bias breakdown of a semiconductor the transistor is fine but at the end of the day all semiconductors will break down this way. Neat way of showing it though@@LearnElectronicsRepair
Yep lets see what chatgpt makes of Richards question ! It will fail as it can't think 'outside the box' which the questions are designed to do ! IMHO@@yvesrochet3288
A really good quiz! I didn't get q4, in the question you said it was open circuit in both directions so that stumped me! So yes that was a great question and answer. Hopefully more in the future. I like quizzes where no one can Google the answer! (directly)
And that is so difficult, google knows everything, and anything it doesn't know my wife knows 😆 And googling the answer removes the point in trying the quiz but some people just don't understand what the point really is.. I do try to make the answers informative and educational though
Got most right, but I did guess tunnel/Gunn diode on the last. Lived the quiz, but as a math nerd wished you would have shown people how to calculate logs, and I would love to see a video on why audio taper pots aren't actually logarithmic, and the differences between audio and true log pots!
got caught out on the log pot a daft misstake . I have used relaxation osc as simple voltage regulators .so 3 out of 4 if you except a diac as correct for number 4
Excellent stuff, thank-you. Quick Q for you....is the Slider Potentiometer truely 'logarithmic' or is it just two 'linear' gradients joined together? I've seen tests on 'logarithmic' rotary pots and most of those appear to actually be just two linear gradients transitioning at roughly the center point....is it the same for sliders pots too? (I don't have one to test)
@@LearnElectronicsRepair Thank-you for looking, do you know if this is indicated anywhere on the slider? I've never been able to distinguish one type from the other visually...is there a way? I remembered my resource for rotary 'linear taper' audio pots, it is on YT by Julian Ilett entitled 'Investigation: Are Log Potentiometers really Logarithmic?', around the 2 min mark shows a graph which demonstrates a 'linear taper' audio pot. Cheers, and Happy New Year!
yes when the Zener exceeds its 'Zener' voltage it will then experience 'avalanche breakdown. For most Zener diodes, the Zener breakdown is the dominant breakdown mechanism, and they are designed to operate in this mode while maintaining voltage regulation. Avalanche breakdown is typically avoided I think it should be noted that this effect is typical of a semiconductor junction@@LearnElectronicsRepair
@@andymousefirst post on here gulp, I was thinking zener diode myself but I guess that would only work if input voltage was fluctuating, I’m probably wrong as new to electronics but loving it 😊
Enjoy the hobby ! I think I have added nothing but confusion as a Zener will breakdown after the Zener voltage (reversed bias) has been reached and breached but for the purpose of this brain teaser stick to what Richard says Happy New Year !@@davidstevens3355
@@LearnElectronicsRepair I asked the question about the meter used in the question video specifically so I could check the input impedance. I have some that are 20M, the Fluke 79 is rated at 11.1M and others can be as low as 1M so, as you infer, the answer would become "more correct" as the input impedance increases.
It has been used in 'white noise generators' which can help you sleep, so the noise caused by the breakdown is filtered and amplified. Thats where I first encountered this in a project posted in Electronics Today International called "The Dream Machine" as the noise is refined still further to give 'Pink' noise and this is supposed to enhance dream sleep (REM) I found it very relaxing as it is the sound of light rain or running water. the magazine 'ETI' was around in the 80's I don't know if you were !!
G,day Sir, from Sydney Australia. After the answers, I'm in a meditational state after your Quiz answers. However... * didn't know that the multi meter consumed 10 oms in measurements. (3 AA's in the back) * were does the voltage go when reduced by a potentiometer in a circuit? * Q4 wouldn't have guessed a transistor (know now) hey? 🧲🤨💡
i don't recall last year , happy 2024 to you and your wife, and everyone in this channel.
Got them all wrong and I've learnt tons from that, fascinating! Thank you. You make it relaxing and easy to learn.😊🎉
Fun, enjoyable and educative! Thank you and a Happy New Year, Richard!
A for audio, B for balance. 🎉 Happy New Year 🎉 learn something new every day, this is a good start!
B for balance (like both halves of the resistive track are the same resistance). I like that 😀
you are terrible@@LearnElectronicsRepair
Happy new year! Thank you for taking the time to do this video :)
Happy New Year.
Hey Richard. I got 1, 2, & 3 but not 4 - Well done {I guessed 3, never thought of replaying to read the text!}
Happy New Year!. You got me on the Transistor one, I was thinking it was a Zener Diode.
Not far out ! it is a semiconductor in reverse biased mode breaking down or in 'Avalanche' condition. Even Zener's have this reverse breakdown effect and it operates after the Zener breakdown so you (hopefully !) never see it, you just see the desired Zenner goodness.
@@andymouse Yes but you can't use a zener in this circuit as it does not break down in the same way, it just maintains the zener voltage. You need something with hysteresis to make this work
I also, it will be interesting ask the 4 questions to OpenAI 🙂
Thats my point, the Zener voltage is sustained as the device is doing what its supposed to do. But a Zener will experience an 'Avalanche' breakdown as well if you push it further in reverse beyond the Zener breakdown. Just to show a simple reverse bias breakdown of a semiconductor the transistor is fine but at the end of the day all semiconductors will break down this way. Neat way of showing it though@@LearnElectronicsRepair
Yep lets see what chatgpt makes of Richards question ! It will fail as it can't think 'outside the box' which the questions are designed to do ! IMHO@@yvesrochet3288
Got the 1st third and fourth right yay. First test with a C average this year. I'm off to a great start.
🎉
Thanks for the education. Happy New year.
Lol I learned something today thanks Richard see you at the live stream
Thanks for your work, always interesting and helpful in learning. Wishing you and yours well for a happy new year.
Another great quiz!
Thank you and happy new year.
A really good quiz! I didn't get q4, in the question you said it was open circuit in both directions so that stumped me! So yes that was a great question and answer. Hopefully more in the future. I like quizzes where no one can Google the answer! (directly)
And that is so difficult, google knows everything, and anything it doesn't know my wife knows 😆 And googling the answer removes the point in trying the quiz but some people just don't understand what the point really is.. I do try to make the answers informative and educational though
Quite enjoyable and educational as always. Thank you Richard.
Happy New Year, and thank you for all you are doing! 😊🙏
BTW, nice questions. 👍
Got most right, but I did guess tunnel/Gunn diode on the last. Lived the quiz, but as a math nerd wished you would have shown people how to calculate logs, and I would love to see a video on why audio taper pots aren't actually logarithmic, and the differences between audio and true log pots!
To be honest I tend to keep math off the channel but Ido take your point
It was only the last one that had me scratching my head. 🤔
Happy New Year, Richard. 🥳
Happy new Year Richard 🥳
Great explaination and its never to late to learn 🥳👍
Heya, happy new year. exept for the last question I was right nice and learned some more about transistors what a start of the neew year thanks
Happy New Year !!....cheers.
Happy new year and thanks for all the videos. 3 out of 4 ain't bad (I did not get the last one)
got caught out on the log pot a daft misstake .
I have used relaxation osc as simple voltage regulators .so 3 out of 4 if you except a diac as correct for number 4
I do accept a diac for Q4 if you can find one with less than 12V breakdown
got me 28 volt lowest i can find@@LearnElectronicsRepair
On the speaker quiz, could a zener diode work?
0/4 for me LOL. Thx & happy new year.
Awesome. Thanks!
Cool, nice one thank you :)
Happy new year!
😊🎉
Happy New Year!
Excellent stuff, thank-you. Quick Q for you....is the Slider Potentiometer truely 'logarithmic' or is it just two 'linear' gradients joined together? I've seen tests on 'logarithmic' rotary pots and most of those appear to actually be just two linear gradients transitioning at roughly the center point....is it the same for sliders pots too? (I don't have one to test)
it looks logarithmic when i checked with the multimeter
@@LearnElectronicsRepair Thank-you for looking, do you know if this is indicated anywhere on the slider? I've never been able to distinguish one type from the other visually...is there a way? I remembered my resource for rotary 'linear taper' audio pots, it is on YT by Julian Ilett entitled 'Investigation: Are Log Potentiometers really Logarithmic?', around the 2 min mark shows a graph which demonstrates a 'linear taper' audio pot. Cheers, and Happy New Year!
Happy newyear Richard
Happy new year! I was thinking that voltage on the slider should be 2.5V not 1.5V... ;(
So was I, going by the graph I found at Wikipedia
Would the internal resistance of the multimeter scew the result? as per Q1
@@melvilib No because the resistance of the pot is so much lower than the multimeter input impedance
@@LearnElectronicsRepair Thanks, I should have done the math(s). 3 right though. Still learning at 64
Happy new year
Would a zener diode work instead of the transistor?
Any diode will break down so yes but I'm not the MC ! Richard is the boss ! Happy new year !
@@andymouse No. When the zener breaks down it maintains the zener voltage. You need something which displays hysteresis as described in this video
yes when the Zener exceeds its 'Zener' voltage it will then experience 'avalanche breakdown. For most Zener diodes, the Zener breakdown is the dominant breakdown mechanism, and they are designed to operate in this mode while maintaining voltage regulation. Avalanche breakdown is typically avoided I think it should be noted that this effect is typical of a semiconductor junction@@LearnElectronicsRepair
@@andymousefirst post on here gulp, I was thinking zener diode myself but I guess that would only work if input voltage was fluctuating, I’m probably wrong as new to electronics but loving it 😊
Enjoy the hobby ! I think I have added nothing but confusion as a Zener will breakdown after the Zener voltage (reversed bias) has been reached and breached but for the purpose of this brain teaser stick to what Richard says Happy New Year !@@davidstevens3355
I’m assuming a very high impedance multimeter will mitigate the problem in question one…
Yes. or try a scope with a x10 probe 😉
@@LearnElectronicsRepair I asked the question about the meter used in the question video specifically so I could check the input impedance. I have some that are 20M, the Fluke 79 is rated at 11.1M and others can be as low as 1M so, as you infer, the answer would become "more correct" as the input impedance increases.
42!
Thanks, for the lesson. Where do we find the last one in practice ? Have a blessed 2024 in Jesus Christ name amen.
the circit using a kind of diode was used in early oscilloscopes for the X timee base
It has been used in 'white noise generators' which can help you sleep, so the noise caused by the breakdown is filtered and amplified. Thats where I first encountered this in a project posted in Electronics Today International called "The Dream Machine" as the noise is refined still further to give 'Pink' noise and this is supposed to enhance dream sleep (REM) I found it very relaxing as it is the sound of light rain or running water. the magazine 'ETI' was around in the 80's I don't know if you were !!
G,day Sir, from Sydney Australia.
After the answers, I'm in a meditational state after your Quiz answers. However...
* didn't know that the multi meter consumed 10 oms in measurements. (3 AA's in the back)
* were does the voltage go when reduced by a potentiometer in a circuit?
* Q4 wouldn't have guessed a transistor (know now) hey?
🧲🤨💡
Happy new year