Activity for Circuit fantasist
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #284860 |
Post edited: Replaced link |
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| Edit | Post #284860 |
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| Edit | Post #284860 | Initial revision | — | about 3 years ago |
| Article | — |
What are voltages in circuits? Need to visualize voltages I hope I have convinced you that a powerful technique for explaining circuits in an intuitive way is to show where currents flow. But since currents are created by voltages, it is even more important to show what voltages of the internal circuit points are. Voltages... (more) |
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| Edit | Post #284816 |
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| Edit | Post #284816 | Initial revision | — | about 3 years ago |
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Where do currents flow in circuits? Need to visualize currents I have long understood that one of the most important techniques to understand circuits is to see where currents flow inside them (in circuit theory, this is considered unimportant and, at best, currents are represented by small arrows with arbitrary direction). The... (more) |
— | about 3 years ago |
| Comment | Post #283942 |
Yes, this is a small exception... So, if we connect two photodiodes in a loop, they will compete and this network will act like a "dynamic load"? If so, this will be a very sensitive differential photo sensor... (more) |
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| Edit | Post #283942 |
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| Edit | Post #284252 |
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| Edit | Post #284252 |
Post edited: Refining |
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| Edit | Post #284252 |
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| Edit | Post #284252 |
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| Edit | Post #284252 |
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| Edit | Post #284252 |
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| Edit | Post #284252 | Initial revision | — | about 3 years ago |
| Answer | — |
A: Change of pins in monostable multivibrator Your circuit will make sense if you do two things: significantly increase both R3 and R4 reverse D1 or move it to Q1's base Let's first see the role of the resistances R3 and R4. These are base resistors; so their resistances should be higher than the collector resistances R1 and R2. F... (more) |
— | about 3 years ago |
| Edit | Post #283942 |
Post edited: Refining |
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Post edited: Specifying |
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Post edited: Explained "transistor cloning" |
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| Edit | Post #283942 |
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Post edited: Added note to LvW |
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| Edit | Post #283942 |
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Post edited: Added explanation |
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| Comment | Post #283942 |
"The essence of the ideal current source is quite simple" because it is presented in a formal way in textbooks. As a result, students only superficially know what a current source is - just as a definition and as a circle with an arrow inside that keeps the current constant. But they do not know how ... (more) |
— | about 3 years ago |
| Edit | Post #283942 |
Post edited: Minor edit |
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| Edit | Post #283942 |
Post edited: Specifying the source resistance |
— | about 3 years ago |
| Comment | Post #283942 |
Here is another point of view on this issue. The dynamic resistor (transistor) plays only the role of a self-regulating element that determines the current produced by the voltage source just as the transistor in an amplifier plays the role of a regulating element. In both cases, for the purposes of ... (more) |
— | about 3 years ago |
| Comment | Post #282696 |
This view may work well in a formal circuit analysis but not for the purposes of the intuitive circuit understanding where the source is source... and the resistor is a resistor... (more) |
— | about 3 years ago |
| Comment | Post #283942 |
In electronics, we use a more clever trick to make almost "ideal" (perfect) current sources - we keep the voltage constant but vary the resistance when some disturbance (e.g., the load) tries to change the current. So, the resistance is not infinite but "dynamic".
In the transistor implementation... (more) |
— | about 3 years ago |
| Comment | Post #283942 |
Okay, I did not want to delve into the essence of the ideal current source, but I will clarify.
The ideal current source is an element but, for the purposes of intuitive understanding, we need to know what is inside it… since there are no genuine current sources in nature… and we have somehow to m... (more) |
— | about 3 years ago |
| Edit | Post #283942 |
Post edited: Specifying the current sources |
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| Edit | Post #283942 |
Post edited: Specifying the current sources |
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| Edit | Post #283942 |
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| Edit | Post #283942 | Initial revision | — | about 3 years ago |
| Answer | — |
A: Help with differential to single ended voltage converter My Comment ========== I will begin my answer by commenting on the other two answers from two months ago. I will show that they do not contradict but rather complement each other. Ideal current sources. I can not agree with Olin Lathrop's assertion that this arrangement "works fine for ideal cu... (more) |
— | about 3 years ago |
| Edit | Post #282696 |
Post edited: There are two desired but one real current |
— | about 3 years ago |
| Suggested Edit | Post #282696 |
Suggested edit: There are two desired but one real current (more) |
helpful | about 3 years ago |
| Comment | Post #282696 |
I was happy to read your answer because it really gives a good intuitive explanation... but I have a few remarks.
Regarding the function of Q2 and Q4, what are they? "Passive current sources" and "controlled variable resistance" do not sound well since they are neither sources nor (ohmic) resistan... (more) |
— | about 3 years ago |