Activity for DeadMouse
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #288504 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288504 | Initial revision | — | over 1 year ago |
| Question | — |
Sensing 3 states in a single mcu pin using firmware I want to sense 3 different states in the same mcu pin (GND, Hi-Z and PWR). PWR is typical +24V but I would like to have a wide margin from +17V to +40V just to be safe. The values can change but the typical will still be +24V I need 32 different (physical) inputs. I designed the following c... (more) |
— | over 1 year ago |
| Comment | Post #288474 |
Thanks! That's helpful (more) |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Comment | Post #288440 |
Also, a simple inversion won't do the trick. I added a truth table that shows the output with 3 differnt types of input for each option.
For example, if you just put a NOT gate on Option 1, you will not get Option 2. (more) |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Comment | Post #288440 |
Adding the inversion in the firmware would require one more pin from the chip.
I need total 36 inputs that would be able to invert independently. That is 72 pins total. One for the input and one for its selection control. That's why I want to handle this in the hardware side (more) |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 |
Post edited: |
— | over 1 year ago |
| Edit | Post #288440 | Initial revision | — | over 1 year ago |
| Question | — |
How to change the polarity of an input using a single switch? I have an mcu pin and I want to sense a voltage up to 24V to 36V. I want to connect some outputs on the board I'm designing and I don't know whether those outputs will provide a voltage or will be open collector outputs. Also, some outputs will be just relays and the other terminal will be at G... (more) |
— | over 1 year ago |
| Edit | Post #287295 | Initial revision | — | about 2 years ago |
| Question | — |
Energy harvesting from non-invasive current sense transformer I have a non-invasive current sense transformer (SCT-013-030) which according to its datasheet it is voltage output type. I want to harvest energy and supply a wireless sensor that consumes 5-6 uA current average. The most common approach is a rectifier on the output of the transformer. But I'm... (more) |
— | about 2 years ago |
| Comment | Post #287265 |
I'm not sure I can achieve such steep skirts with discrete components.
I'd aim for 100KHz bandwidth but 300kHz is much easier to achieve with discrete parts.
Would there be any problem if the skirts were not that steep?
And yes, I noticed that ceramic resonators are very hard to find at a f... (more) |
— | about 2 years ago |
| Comment | Post #287263 |
Thank you very much for your answer.
I am pretty sure that my problem is the tight bandwidth of the Murata part as you mention.
I'll try out a bandpass filter using discrete components and maybe find another suitable part. I'll also try a direct communication off of power line by connecting t... (more) |
— | about 2 years ago |
| Comment | Post #287262 |
You probably mean connecting the outputs (right part of C4) together and off of DC line, right?
Thank you! I'll try it.
Regarding the main question, what's the difference between those two components above (a ceramic filter and a ceramic resonator)?
Is the part I found suitable for that ... (more) |
— | about 2 years ago |
| Edit | Post #287262 |
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— | about 2 years ago |
| Edit | Post #287262 |
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— | about 2 years ago |
| Comment | Post #287262 |
Datasheets and screenshot added.
What do you mean by exclusive connection?
The tests are on a bench and the devices are communicating over a DC line of 24V. (more) |
— | about 2 years ago |
| Edit | Post #287262 |
Post edited: |
— | about 2 years ago |
| Edit | Post #287262 |
Post edited: |
— | about 2 years ago |
| Edit | Post #287262 |
Post edited: |
— | about 2 years ago |
| Edit | Post #287262 |
Post edited: |
— | about 2 years ago |
| Edit | Post #287262 | Initial revision | — | about 2 years ago |
| Question | — |
Ceramic filter vs ceramic resonator I have a design of a power line communication using the following IC. https://www.yamar.com/datasheet/DS-SIG60.pdf My design is the same as the example circuit in the datasheet of the chip. Schematic The schematic above uses integrated ceramic filters. There are also some suggested part n... (more) |
— | about 2 years ago |
| Comment | Post #286104 |
"Note C3 to provide stability, and R2 to provide some impedance for C3 to work against. "
What does R2 really do here?
Could we use the same topology C3 along with R2 on the other circuit above? (more) |
— | over 2 years ago |
| Comment | Post #286110 |
What I'm calculating is
$$D=\frac{20\text{V}}{-24\text{V}-20\text{V}} = -0.45... $$ (more) |
— | almost 3 years ago |
| Comment | Post #286104 |
I did not understand the negative regulator part you're talking about. How would that work? (more) |
— | almost 3 years ago |
| Comment | Post #286103 |
I don't mind about wasted power. The device will be inside the lab always. (more) |
— | almost 3 years ago |
| Edit | Post #286103 |
Post edited: |
— | almost 3 years ago |
| Edit | Post #286103 |
Post edited: |
— | almost 3 years ago |
| Edit | Post #286103 |
Post edited: |
— | almost 3 years ago |
| Edit | Post #286103 |
Post edited: Added design requirements |
— | almost 3 years ago |
| Comment | Post #286103 |
You are right. At first I would be happy to have around 0.1% error. I was thinking of using a 12 bit DAC. (more) |
— | almost 3 years ago |
| Comment | Post #286103 |
The upper voltage across the load can be a little lower if we calculate the voltage drop across the current sense and the power element. I wouldn't mind even if that voltage drop was around 6V or even 8V. On the other hand the low voltage across the load must be closest to zero possible. (more) |
— | almost 3 years ago |
| Edit | Post #286103 | Initial revision | — | almost 3 years ago |
| Question | — |
DAC controlled high side current source. I'm designing a high side current source that can be controlled with a Digital-to-analog and can source up to 100mA with voltage supply up to 36V. By high side I mean one side of load will be always grounded. Below you can see a reference design of a such circuit. Image alt text In the de... (more) |
— | almost 3 years ago |
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