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1.2k posts
 
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Q&A Why would a standby UPS fail to power devices when there's no power outage?

I have an ordinary consumer-grade standby UPS with, I believe, ample power for the devices connected to it.[1] It's five years old. For the second time in about a month, I've found my computer po...

4 answers  ·  posted 10mo ago by Monica Cellio‭  ·  last activity 10mo ago by Canina‭

Question power-supply
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Q&A What type of button is this on a remote control

Such a domed button is usually called a "membrane switch", at least here in the US. As you say, the small metal bubble makes contact with something underneath when pressed. Advantages of membrane...

posted 11mo ago by Olin Lathrop‭

Answer
66%
+2 −0
Q&A Converting 5V to ±12V

You say the only thing that will be powered by the ±12 V supplies is a comparator. The first thing I would look at is whether you really need the comparator to run from that voltage range. Presum...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

Answer
66%
+2 −0
Q&A Ceramic capacitor "memory" effect?

I have never seen this slow drift in ceramic caps, yet I have seen fast memory effect drift in S&H designs using high Dk ceramic capacitors in the 70's. So I have learnt that all ceramic caps h...

posted 1y ago by TonyStewart‭

Answer
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Q&A What type of button is this on a remote control

The remote control of my TV has two kinds of buttons. There are "normal" ones for the digits etc. which work by bringing a conductive material on the underside of the button in contact with the boa...

2 answers  ·  posted 11mo ago by samcarter‭  ·  last activity 10mo ago by TonyStewart‭

Question identification
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Q&A ATX Computer Power Supply Spark in Non-computer Application

Hello! I would like to ask for your assistance with using a Silverstone DA1650 Gold computer power supply (you can find more about it here: Silverstone DA1650 Gold) for a non-computer application. ...

1 answer  ·  posted 1y ago by Gabriel‭  ·  last activity 1y ago by DSI‭

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Meta What residential wiring questions are on-topic here?

The reason I left that comment is because determining the quality of a coaxial cable involves electrical engineering more so than an electrician, let alone some DIY. The rule of thumb "would you a...

posted 1y ago by Lundin‭  ·  edited 1y ago by Lundin‭

Answer
66%
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Meta Professional vs Hobbyist advice and potentially dangerous projects

the original question is interesting and deserves a technical answer So go write one. That's your call, just like it's mine not to. We are all volunteers here, and are therefore never obligated ...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A What are some best practices for library management?

There is no definite answer to this but, if you want my advice, you store all symbols and footprints locally with your project. Of course you may begin by using standard parts from a global (comes-...

posted 1y ago by Andy aka‭  ·  edited 1y ago by Andy aka‭

Answer
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Q&A What are some best practices for library management?

I don't know about "best practices", but I make all my own library parts. I use Eagle, and the library parts that come with Eagle are quite inconsistent in things like pad shapes, what is shown on...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

Answer
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Q&A Will shorting a lithium ion battery cause an explosion?

I've seen batteries get shorted a few times. They heat up, and obviously the battery is not useful after, but I've never seen them explode or catch fire. I've read reports of some batteries catchin...

3 answers  ·  posted 1y ago by matthewsnyder‭  ·  last activity 1y ago by TonyStewart‭

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Q&A Will shorting a lithium ion battery cause an explosion?

Since you seem to be asking about whole batteries, not individual bare cells, dangerous effects should be limited. Consumer batteries made from lithium cells almost always include integrated prote...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Essential safety features of an EMG/medical grade device?

Safety of medical devices is not something you should be asking random folks on the internet about. The rules are stringent, for good reason. The clearance and creepage distances to line voltage,...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Disabling breakpoints in real-time section of firmware

I have a similar problem when debugging firmware on a dsPIC that drives a flyback power supply. The switch isn't designed to be on for very long, as eventually the inductor saturates. Usually the...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A Two way circuit breaking capability for ideal diode controllers

The two ICs you reference don't do the same thing. The first sentence of the first datasheet says: The MAX16141/MAX16141A ideal diode controllers provide system protection against a variety of sy...

posted 1y ago by Olin Lathrop‭

Answer
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Q&A H(jω) does not exist for unstable systems, but we still use it when designing controllers - contradiction?

I don't have that book, but the statement you cite (emphasis mine): ... when s=jω the integral on the RHS of eq. 2.48 does not converge for unstable systems doesn't mean the transfer function...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
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Meta How to deal with design review questions?

A while back someone suggested that we added a section for reviews to the site - How about a new section for code reviews? From that meta thread we gathered that: There seems to be community con...

1 answer  ·  posted 1y ago by Lundin‭  ·  last activity 1y ago by Olin Lathrop‭

66%
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Q&A Disabling breakpoints in real-time section of firmware

Breakpoints are beyond the scope of the C language, so this is up to the specific debugger and CPU core. What you will probably have to do to block accidental breakpoints is to not provide any debu...

posted 1y ago by Lundin‭

Answer
66%
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Q&A Deriving resistor values for a taper pad attenuator

Here is another take at that problem. First let's define some quantities that will be useful later: \[ \begin{align} A &= \frac {V_2} {V_1} \qquad\qquad B = \frac {R_L} {R_S} ...

posted 1y ago by Lorenzo Donati‭  ·  edited 1y ago by Lorenzo Donati‭

Answer
66%
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Meta Tag naming guidelines.

Additions: Do not use company names in tags. Questions should be about specific products, not about companies. Furthermore, silicon companies merge/split and purchase each other all the time, ...

posted 1y ago by Lundin‭

Answer
66%
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Meta Tag creation/deletion criteria

Draft for a tag creation/deletion criteria A tag must fulfill all of the below requirements or it may get renamed or deleted: A tag must be named appropriately, considering Tag naming guideline...

posted 1y ago by Lundin‭

Answer
66%
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Meta Tag creation/deletion criteria

I agree with the answer of Lundin except for point 3 disambiguation. Regarding 3), in case a term does have several different meanings and all meanings are on-topic, then the most common/jangon ...

posted 1y ago by Lorenzo Donati‭

Answer
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Q&A High power LC circuit with programmable resonant frequency

I intend to build a high-power series LC resonant circuit for the purpose of generating strong magnetic fields at a wide range of frequencies, mostly audio range (1-5000 Hz). The inductor coil is a...

1 answer  ·  posted 1y ago by dcsuka‭  ·  edited 1y ago by dcsuka‭

66%
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Q&A Oscillator with non-rechargable battery

There actually seem to be two different questions here. Can a primary (non-rechargable) battery be damaged by forcing reverse current thru it? Yes. Primary batteries are only intended to source ...

posted 1y ago by Olin Lathrop‭  ·  edited 1y ago by Olin Lathrop‭

Answer
66%
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Meta Apparent loss of reputation in last 24 hours

Has anyone else noticed a loss of reputation recently. I thought I checked yesterday and my reputation was a hundred points higher at 1889. Now it is at 1789. My vote summary doesn't indicate a los...

1 answer  ·  posted 1y ago by Andy aka‭  ·  last activity 1y ago by Monica Cellio‭