Activity for Circuit fantasist
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #278836 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278836 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278836 |
Post edited: Mentioned another stage |
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| Edit | Post #278836 |
Post edited: Mentioned another stage |
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| Edit | Post #278836 |
Post edited: Adding another activity |
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| Edit | Post #278836 | Initial revision | — | over 3 years ago |
| Article | — |
Charge amplifier (a qualitative view) Goals and objectives As can be seen from the name of the new platform (Codidact = Co + didact), it claims to use the principles of didactics (the art and science of teaching) for the purposes of the Electrical Engineering section as well. And since I have been involved in didactics in electronic... (more) |
— | over 3 years ago |
| Comment | Post #278760 |
I support the question and this kind of questions. I think that, in addition to specific questions, there should also be general questions. CoDidact will only benefit from this. (more) |
— | over 3 years ago |
| Comment | Post #278617 |
@coquelicot and LvW, Let's not bring here some not very good manners from other places. Let this be a good place where everything is done in the name of the great goal - UNDERSTANDING CIRCUITS. (more) |
— | over 3 years ago |
| Edit | Post #278637 |
Post edited: Added related link |
— | over 3 years ago |
| Comment | Post #278636 |
I think that really, voltage is the cause and current is the effect... the voltage causes the current. Figuratively speaking, we can think of the voltage source as of a motor that drives the load through an "electrical transmission" (current). (more) |
— | over 3 years ago |
| Comment | Post #278637 |
I am not sure if this is the right name. I mean that "voltage-stable" = voltage-stabilizing = constant-voltage = voltage-type = diode IV curve... and the dual "current-stable" = current-stabilizing = constant-current = current-type = transistor output IV curve. The best combination is of two mutuall... (more) |
— | over 3 years ago |
| Comment | Post #278654 |
Thanks for the response. You made me think more about the technology of "self-answering questions". Perhaps the best option is to show one (your) possible answer and expect to receive more answers. But in any case, you have to signal to the others that you know some answer. (more) |
— | over 3 years ago |
| Edit | Post #278637 |
Post edited: Added another reason |
— | over 3 years ago |
| Comment | Post #278630 |
Interesting thoughts... BTW where can we see the "current control" in the circuit of a follower? (more) |
— | over 3 years ago |
| Comment | Post #278636 |
I completely support your observations about the difference between the physical and circuit view. Circuits need rather a kind of a "functional" than physical view. To understand circuits, we need to imagine what and how active devices do what they do... we have to imagine the circuit operation. It i... (more) |
— | over 3 years ago |
| Edit | Post #278637 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278637 |
Post edited: Numbering the rules |
— | over 3 years ago |
| Comment | Post #278636 |
Incredibly beautifully written ... it was a real pleasure for me to read it. I am not a professional circuit designer but the observations I have from my practical experience and a lot of reasoning make me support this opinion. To avoid the "war" between current and voltage, I would offer the followi... (more) |
— | over 3 years ago |
| Edit | Post #278637 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278637 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Why Ib=const. for BJT output characteristics Ic=f(Vce) I fully agree with OP considerations about measuring the transistor output curve. We can very easily and precisely set successive current values with constant increment. Thus, the IV curves will be evenly spaced vertically (equidistant from each other). Let me generalize these observations into a ... (more) |
— | over 3 years ago |
| Comment | Post #278613 |
So, we can simply say that it behaves as an "ideal" (perfect, constant, steady) voltage source? (more) |
— | over 3 years ago |
| Comment | Post #278604 |
… The upper (Vdd) sources current to this point thus trying to increase its voltage and the lower (ground) sinks current from it thus trying to decrease it. As though, the two sources "pull" the common point in opposite directions - up and down… (I will finish my response later since now I have to go... (more) |
— | over 3 years ago |
| Comment | Post #278604 |
… Most electronic circuits (probably > 90%) are based on this humble network of two elements in series supplied by a voltage source… because they handle voltage; the old voltage divider is the simplest example. Besides this classic viewpoint, we can think of it also as of two voltage sources (the one... (more) |
— | over 3 years ago |
| Comment | Post #278604 |
@coquelicot, Thanks for the sincerity. People like you make me drop everything else and try to explain the philosophy of things to them... but it takes time and room…and not bother me with "no discussion" warnings. Usually, I richly illustrate my answers but here I assumed that everyone knows what... (more) |
— | over 3 years ago |
| Edit | Post #278604 |
Post edited: Minor edit |
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| Edit | Post #278604 |
Post edited: Minor edit |
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| Edit | Post #278604 |
Post edited: About the setup |
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| Edit | Post #278604 |
Post edited: Minor edit |
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| Edit | Post #278604 |
Post edited: More about the voltage after R |
— | over 3 years ago |
| Edit | Post #278604 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278604 |
Post edited: Minor edit |
— | over 3 years ago |
| Edit | Post #278604 | Initial revision | — | over 3 years ago |
| Answer | — |
A: How to calculate pullup resistor value for pushbutton? Figuratively speaking, Olin Lathrop's answer is a wonderful story about the unequal "tug of war" between a "pulling up" resistor and "pulling down" switch. And, when the switch is 'off', the "struggle" is between the resistor and input leakages… and then the resistor must win. To be more precise, ... (more) |
— | over 3 years ago |
| Comment | Post #278582 |
Olin, Perfectly and comprehensively written answer (like a paper) which was necessary not only for me but also for the meta section! I need time to realize it. But I think the question was also well formulated:) I feel sympathy for your endeavor because I have started initiatives all my life. Here is... (more) |
— | over 3 years ago |
| Comment | Post #278548 |
@Olin Lathrop, I asked a question in the meta section about this problem - https://electrical.codidact.com/questions/278579 (more) |
— | over 3 years ago |
| Edit | Post #278579 | Initial revision | — | over 3 years ago |
| Question | — |
Can I ask a question to which I have a possible answer? For many years I have been working on unraveling the basic ideas behind famous circuit solutions. Thus I gradually managed to accumulate a collection of circuit principles and clever tricks. I have my intuitive explanations of circuit phenomena that significantly differ from classic formal explanatio... (more) |
— | over 3 years ago |
| Comment | Post #278548 |
@Olin Lathrop, OK, I see... I had two possibilities - to show my possible answer or to wait for others to show their solutions (as you)... and I chose the latter. Another time I chose the former... but result was the same - negative reactions. I thought it would be different here, so I was enthusias... (more) |
— | over 3 years ago |
| Comment | Post #278548 |
@Olin Lathrop, I am sorry if it is taken this way. I have already told how the idea for this conceptual question arose from something specific from the distant past. My idea was to get confirmation of my current hypothesis, so I asked it. I did not want to direct the answers in a certain direction ... (more) |
— | over 3 years ago |
| Comment | Post #278548 |
Thanks again for the efforts! I feel a little awkward about the time taken. Rather, I expected you to be a little affected by my naive question.
My idea was even simpler. An LED is supplied by a current and is lit. The SPST switch connects another LED with lower VF in parallel. It diverts the cur... (more) |
— | over 3 years ago |
| Edit | Post #278546 |
Post edited: Making the question more clear |
— | over 3 years ago |
| Comment | Post #278548 |
Thanks for the responce; it means a lot to me. My idea was to do the opposite - no equalizing resistors... and then the LEDs to act themselves as switches. Then the idea came to me to consider them together with the transistor as a "composite SPDT switch"... and I decided to ask this question... but ... (more) |
— | over 3 years ago |
| Comment | Post #278555 |
... I guess you will agree that coming up with a good question is no less difficult than answering it... Really, "an SPST switch can not act as an SPDT switch" but the latter can be assembled by two (NO and NC) SPST switches (transistors). And here is an idea (I have realized it just now) - one of th... (more) |
— | over 3 years ago |
| Comment | Post #278555 |
@Elliot Alderson, As usual, you are in the right place at the right time:) In general, you are right… but not quite. Really, in 1984, I got a patent for an LED voltage indicator where two transistors controlled three LEDs. Now, inspired by the new EE network, I began to realize the idea in a more ge... (more) |
— | over 3 years ago |
| Comment | Post #278548 |
An interesting example... I like this circuit. As though, it is a voltage divider of three resistors in series. The middle "resistor" is variable and it controls the common current that, like an "electrical transmission", connects the voltage drops across R1 and R2 by Ohm's law - V1/R1 = V2/R2, so V1... (more) |
— | over 3 years ago |
| Edit | Post #278546 |
Post edited: Generalizing the question |
— | over 3 years ago |
| Edit | Post #278546 | Initial revision | — | over 3 years ago |
| Question | — |
Is it possible for one transistor to switch between two loads? The output collector-emitter part of a transistor can be thought of as a 2-terminal SPST switch controlled by the input base-emitter voltage or base current. So this transistor switch can control only a single collector load. Is it possible to make the transistor act as a 3-terminal SPDT switch? I... (more) |
— | over 3 years ago |