Activity for Olin Lathropâ€
| Type | On... | Excerpt | Status | Date |
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| Edit | Post #276570 |
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| Edit | Post #276594 |
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| Edit | Post #276592 |
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| Edit | Post #276594 | Initial revision | — | over 4 years ago |
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A: Digital circuit that squares a 4-bit input No, I have not seen this circuit before, and don't know what source you may have gotten it from. However, I'm not sure that really matters. I don't know what exactly you are trying to teach, but most likely the derivation of the circuit is the real lesson. The actual circuit is of little use, an... (more) |
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| Comment | Post #276235 |
@Monica: Consider yourself pinged. (more) |
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| Edit | Post #276566 | Post edited | — | over 4 years ago |
| Edit | Post #276566 | Post edited | — | over 4 years ago |
| Comment | Post #276570 |
@mana: I see you made a suggested edit, but I can't figure out what it is. I click on Review Changes, and I get two texts side by side that look the same as far as I can tell. If there is a change, the system should highlight it somehow. I don't want to approve something when I can't tell what I'm... (more) |
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| Comment | Post #276570 |
@mana: But that's a bad idea some sites. I realize some don't like rep. That's fine. But they also don't want anyone else to have it on other sites where it would help. That's not fine. There needs to be a single obvious "score" somehow that shows how much a user's contributions were appreciated... (more) |
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| Edit | Post #276570 |
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| Edit | Post #276570 | Initial revision | — | over 4 years ago |
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Let's have a "Papers" category. Currently, we have two categories, Q&A and Meta. Those seem to be working well. New topic type available A category can now be created where there is a single post per topic, with only comments allowed on that post. The Meta site uses this for their Blog category, and the Cooking site for the... (more) |
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| Edit | Post #276235 |
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| Comment | Post #276408 |
@Brok: Your schematic shows a normal diode. You need to take more care with your schematics. You are wasting the time of the volunteers that are trying to help you. (more) |
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| Edit | Post #276408 |
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| Edit | Post #276408 |
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| Edit | Post #276408 |
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| Edit | Post #276408 |
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| Edit | Post #276408 | Initial revision | — | over 4 years ago |
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A: Humming noise from a boost converter's inductor First, draw schematics properly when you ask others to look at them. Your right to left flow is rather annoying. There are two main possibilities for this circuit to cause noise, the inductor and the output capacitor. Inductor The inductor can make sound for two reasons: Every bit of wir... (more) |
— | over 4 years ago |
| Comment | Post #276378 |
What Lundin said, since we can't upvote comments here. (more) |
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| Edit | Post #276331 |
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| Edit | Post #276331 | Initial revision | — | over 4 years ago |
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A: Switch-off time of relay with flyback diode It doesn't quite work that way. You are missing the fact that the current (which the magnetic field is proportional to) decays exponentially. You are also missing the resistance of the coil itself. First, let's analyze what happens with just a diode. You basically have this circuit: Image al... (more) |
— | over 4 years ago |
| Comment | Post #276117 |
@Chup: That depends on the relay. For some "fast" relays, it might make a difference. For relays that take 10s of ms to switch, it probably wouldn't matter anyway. You really have to check the datasheet or ask the manufacturer if switching speed is not specified. (more) |
— | over 4 years ago |
| Comment | Post #276294 |
@Lundin: The compiler can't make that assumption simply due to the variable being global. (more) |
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| Edit | Post #276320 |
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| Edit | Post #276320 | Initial revision | — | over 4 years ago |
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A: When to use RTOS? RTOS A RTOS (Real Time Operating System) is much more than a bunch of interrupts. Most true dedicated microcontroller applications don't need any RTOS or any other kind of operating system. General OS (operating system) An OS adds a layer of abstraction between your application and the hard... (more) |
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| Edit | Post #276305 |
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| Edit | Post #276306 | Initial revision | — | over 4 years ago |
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A: What is a bootloader, and how would I develop one? Bootloader definition A bootloader is a program that runs in the microcontroller to be programmed. It receives new program information externally via some communication means, like a serial port, and writes the information to the program memory of the processor. This means that bootloaders ca... (more) |
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| Edit | Post #276305 | Initial revision | — | over 4 years ago |
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What is a bootloader, and how would I develop one? I've heard that a bootloader is code that runs on a microcontroller, and is used to get your application code onto the micro. How does that work? Is there anything special that needs to be done to write a bootloader? If a bootloader is for getting code onto a micro, how do you get the bootloa... (more) |
— | over 4 years ago |
| Comment | Post #276294 |
Nice writeup with lots of detail, +1. However, all hardware registers don't need to be declared volatile, only the ones the hardware can change. For example, a UART baud rate divider register would not need to be volatile, since you write the value and the hardware never changes it. (more) |
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| Comment | Post #276263 |
@Andy: I changed the TIFF image to JPEG. Can you see it now? (more) |
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| Edit | Post #276263 |
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| Comment | Post #276263 |
@Andy: See the main meta question https://meta.codidact.com/questions/276272 and let them know which images you see. (more) |
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| Comment | Post #276263 |
@Andy: Strange. I see it in my browser. I'm using Edge on Win 10, and also just tested it with IE on Win 10. Both showed the image correctly. What browser and OS are you using? (more) |
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| Edit | Post #276263 | Initial revision | — | over 4 years ago |
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A: Low loss impedance matching without a transformer As an alternative to doing the math, as detailed in Andy's answer, you can use a graphical aid called a Smith chart: Image alt text These were used routinely before computers to match transmitters to antennas. The math behind them is what Andy described. See the Wikipedia page for details, wh... (more) |
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| Edit | Post #276259 | Initial revision | — | over 4 years ago |
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A: Chokes, Beads and Inductors in Pi-filters Pi filters are often used to block high frequencies between a device and the power line it draws power from. In such applications, the considerations specifying the inductor include: How much power current needs to pass, preferably unimpeded by the filter. What frequencies need to be attenuate... (more) |
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| Edit | Post #276258 | Initial revision | — | over 4 years ago |
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A: Pi-Filter for EMC First let's define what a "Pi filter" is: Image alt text The name comes from the inductor and two caps forming the shape of the Greek letter Π. These filters are used for EMC compliance because they attenuate high frequencies. At minimum there is a L-C filter, which attenuates by 12 dB/o... (more) |
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| Edit | Post #276253 | Initial revision | — | over 4 years ago |
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A: Tools required to burn code in a quad flat microcontroller The days of socketed microcontrollers are long gone. In most cases, the socket would cost more than the micro. Nowadays, microcontrollers, whether in quad flat pack packages or not, are surface mount soldered onto boards along with all the other parts. There are then two ways to get the program ... (more) |
— | over 4 years ago |
| Comment | Post #276217 |
@Bruce: I don't know what to tell you. The URL is the one Codidact produced when I uploaded the image. I can see the image in both the Edge and IE browsers. If you are using a modern supported browser, then maybe you should report this as a bug on main meta. (more) |
— | over 4 years ago |
| Edit | Post #276217 |
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