Activity for Kranulisâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Answer | — |
A: Why are there more N type than P type MOSFETs? One reason could be that N type MOSFET can switch loads that are in Drain, meaning that whatever the load voltage, you can turn it on/off directly with any microcontroller, provided that the MOSFET is 5V or 3.3V logic level. You could invert it and do the same with P-Channel, but N-Channel just feels... (more) |
— | about 2 years ago |
| Answer | — |
A: Electrolytic vs ceramic capacitors about self-resonance frequency A quick google search provides the answer. Image alt text Lower capacitance will shift the graph to the right. 0 effort, should be closed. (more) |
— | over 2 years ago |
| Question | — |
Why are antenna PCB traces square instead of rounded? While doing some reading on RF designs I ran across this paragraph: Image alt text I have never designed an RF circuit, but all the PCB trace antennas I have seen on development boards are square. For example, ESP32: Image alt text More examples can be found online. If the important thing is ... (more) |
— | about 3 years ago |
| Answer | — |
A: Design considerations for a synchronous DC/DC converter At some point the MOSFET approach will lose to diode if current is sufficiently high: Image alt text The drain-source resistance will cause the forward voltage drop to go up linearly. So picking a MOSFET with a small Rds would be one idea to reduce conduction losses. Checking the gate threshold... (more) |
— | about 3 years ago |
| Question | — |
Why is the resistance of water so high and still so dangerous? Image alt textMeasuring the resistance of water from my tap I got 500kOhm. Adding considerable amount of salt brought it down to 20kOhm: The question I have is why water is such a danger for short circuits if the resistance is so high? Is there an issue with the measurement technique, or are ... (more) |
— | about 3 years ago |
| Question | — |
Can you call an IC pin 'N.C' if it has hidden functionality? The particular IC I ran into this issue with was DS3231 RTC. The pin configuration shows: Image alt text However, the datasheet specifies Image alt text To my knowledge, 'N.C' appears on ICs when it is decided to use a certain package, but not all pins are needed, or leaving extra pins for fut... (more) |
— | about 3 years ago |
| Question | — |
Is there a particular type of lead-free solder that does not degrade soldering tips? I have had my soldering iron tips degrading at ridiculous rates. Granted, they are not very expensive, but sometimes it takes less than 8 hours of soldering for them to degrade to the point where they are no longer usable. I use a soft sponge for cleaning, don't leave the iron on for prolonged times ... (more) |
— | about 3 years ago |
| Answer | — |
A: Why isn't voltage of electric chair higher? After some research I found some reasoning behind the voltage range: 1500V is sufficient to destroy the somatic nervous system, which is responsible for consciousness and feeling of pain. After applying the voltage, within 4ms the subject becomes unconscious faster than the nervous system can regi... (more) |
— | over 3 years ago |
| Question | — |
Why isn't voltage of electric chair higher? I recall vividly a story told by my grandfather who worked with high voltage power lines. A worker drove heavy machinery into 700kV line and then jumped out of the truck, instantly combusting upon touching the ground. I recently read about executions by electric chair, and got curious as to what v... (more) |
— | over 3 years ago |
| Question | — |
Cleaning flux out of USB connectors after soldering When soldering Micro-USB or USB-C connectors by hand, flux is applied generously. This sometimes results in flux getting inside the connector housing, making it sticky and creating high physical resistance when inserting and removing the cable. I have attempted using q-tips and small brushes with alc... (more) |
— | over 3 years ago |
| Question | — |
Why are posts that users clearly approve of being closed? One of the most annoying things about stackexchange has always been the borderline fanatic post closing or duplicate marking. Another question in meta was posed some time ago about the added value of this site. Olin pointed out that "This site grew out of frustration with how SE was managing their si... (more) |
— | over 3 years ago |
| Question | — |
How to define Vsat for MOSFET as a switch? I was looking at this design: Image alt text It uses MC34063 as switching controller. I wanted to adapt this circuit, and I was busy trying to pick R1 value. The datasheet has following formulas:Image alt text The issue I have is with calculating ton/toff, since Vsat is defined as saturation vol... (more) |
— | over 3 years ago |
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Design considerations when using a wireless charging battery pack I want to include a wirelessly charged battery pack into my design. However, I am worried that the wireless charging could damage my main logic board. What considerations, apart from not having loops in main board, have to be taken into account when making design? Are there any specific pitfalls to a... (more) |
— | over 3 years ago |
| Question | — |
Humming noise from a boost converter's inductor My step-up converter makes audible noise both with and without a load.I am almost certain it is the inductor, because when I hold my finger on it I can feel vibration and it gets quieter. Unfortunately, I do not own an oscilloscope and cannot inspect what is going wrong. Here is the schematic: Image ... (more) |
— | almost 4 years ago |