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Posts by Kranulis‭

14 posts
77%
+5 −0
Q&A 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: However, the datasheet specifies To my knowledge, 'N.C' appears on ICs when it is decided to use a cer...

1 answer  ·  posted 3y ago by Kranulis‭  ·  last activity 3y ago by Olin Lathrop‭

Question IC
71%
+3 −0
Q&A 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 re...

1 answer  ·  posted 4y ago by Kranulis‭  ·  last activity 1y ago by Lorenzo Donati‭

Question PCB SMD soldering flux
71%
+3 −0
Q&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 ap...

posted 4y ago by Kranulis‭  ·  edited 4y ago by Kranulis‭

Answer
71%
+3 −0
Q&A Design considerations for a synchronous DC/DC converter

At some point the MOSFET approach will lose to diode if current is sufficiently high: The drain-source resistance will cause the forward voltage drop to go up linearly. So picking a MOSFET with ...

posted 3y ago by Kranulis‭

Answer
71%
+3 −0
Q&A Why are antenna PCB traces square instead of rounded?

While doing some reading on RF designs I ran across this paragraph: I have never designed an RF circuit, but all the PCB trace antennas I have seen on development boards are square. For example,...

2 answers  ·  posted 3y ago by Kranulis‭  ·  last activity 3y ago by TonyStewart‭

Question PCB antenna RF
71%
+3 −0
Q&A Electrolytic vs ceramic capacitors about self-resonance frequency

A quick google search provides the answer. Lower capacitance will shift the graph to the right. 0 effort, should be closed.

posted 3y ago by Kranulis‭

Answer
69%
+7 −2
Meta 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 ...

3 answers  ·  posted 4y ago by Kranulis‭  ·  last activity 3y ago by leroy105‭

69%
+7 −2
Q&A Why is the resistance of water so high and still so dangerous?

Measuring 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 t...

4 answers  ·  posted 3y ago by Kranulis‭  ·  edited 1y ago by Lorenzo Donati‭

Question power
66%
+2 −0
Q&A 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 t...

2 answers  ·  posted 3y ago by Kranulis‭  ·  last activity 3y ago by Pete W‭

Question soldering
60%
+1 −0
Q&A 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. Unfortuna...

2 answers  ·  posted 4y ago by Kranulis‭  ·  last activity 4y ago by Olin Lathrop‭

Question power-supply
60%
+1 −0
Q&A 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 loo...

1 answer  ·  posted 4y ago by Kranulis‭  ·  last activity 4y ago by Olin Lathrop‭

Question battery
60%
+1 −0
Q&A How to define Vsat for MOSFET as a switch?

I was looking at this design: 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: The issue I hav...

2 answers  ·  posted 4y ago by Kranulis‭  ·  last activity 4y ago by Andy aka‭

55%
+3 −2
Q&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...

posted 2y ago by Kranulis‭  ·  edited 2y ago by Kranulis‭

Answer
44%
+2 −3
Q&A 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 ...

2 answers  ·  posted 4y ago by Kranulis‭  ·  last activity 4y ago by manassehkatz‭

Question high-voltage safety