Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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1500 questions
22
votes
4 answers

Why did my fuse blow after 3+ years of no problems?

For several years, I've had a solenoid wired to the 24VDC output of a PLC (Rockewell Automation 1769-OB16). To protect the PLC output card, a fast-acting 500mA fuse was installed between the PLC and the solenoid. The fuse has been working without…
CaptJak
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5 answers

Whats does "hr" mean among "V" and "Ah" in batteries?

I have a battery which indicates 12V25Ah/10hr. What does 10hr mean here? I guess "hr" stands for "hour". But 25Ah already means if battery is fully charged and if I load 12V 25A (=300W) to it, it should last for an hour (correct me if I am…
Farrukh
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3 answers

Do all USB Type C cables support full power delivery?

USB Power Delivery is able to work over USB Type A/B cables which are specifically designed to support it. Since the USB Type C was designed much later, I am curious: Do all USB Type C cables support USB PD by default? And do they support a certain…
William Entriken
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2 answers

What's the main differences between a TSSOP and a SOIC and when would you use one over the other?

I was recently looking at some SPI SRAM chips at Mouser and noticed that a particular IC came in both a SOIC-8 and TSSOP-8 package. The specs seem identical but the price is different (not by much, but different). Visually, it looks like you could…
cbmeeks
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4 answers

How to clean up a noisy signal?

I'm controlling a 4-pin PWM PC fan from a PIC16F684 with the fan speed driven from an ADC reading of a proximity sensor. This all works ok. I wasn't originally planning to use the tachometer output from the fan, but as it's available I been…
Roger Rowland
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3 answers

How to read serial data from oscilloscope

I have a microcontroller (PICAXE 20X2) and a pot meter. I programmed the micro so that it sends any change of pot meter to serial port of PC. Obviously it is a 8bit ADC. Now the interesting thing for me is being able to decode this serial data on…
Dumbo
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8 answers

Dissipating 1W on a TO-220 without heatsink?

Can a TO-220 without a heatsink dissipate 1W in still air? Or, a different way of asking the question is: Assuming an ambient temperature of 25C, how can I go about calculating the maximum power I can dissipate on a TO-220 packaged MOSFET? The…
SomethingBetter
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6 answers

Is there a common netlist format?

Is there a common netlist format that is portable between different schematic/pcb/EDA/CAD tools, and if so where is the format or reference so I can implement it? If not, does each package implement it differently, or are there a few standards that,…
Adam Davis
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11 answers

Injecting a communication signal over DC power supply lines

I'd like to be able to daisy chain multiple devices using just the power supply wires and then inject a communications signal over the power lines to turn it into a half duplex network. Are there any common methods of achieving this? The simpler the…
Peter Gibson
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5 answers

Why is a MOSFET triggered by Vgs and not Vgd?

Looking carefully at this diagram of one type of MOSFET: (found in this application note) We can see the device is virtually symmetrical. What makes the gate reference itself to the source and not the drain? Also, why would the gate oxide break…
Thomas O
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2 answers

Why does the SATA power connector have so many pins?

With only 4 cables, two of which are ground, it seems like it has way too many pins. Why is this so?
Filip Haglund
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22
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6 answers

What's the schematic to share one crystal with two micros?

How do I share a single crystal (not a complete oscillator module) between two micros? Is it OK to just connect everything as normal for the first micro and also directly connect its XO to the XI of the second microcontroller? I expect to place the…
joeforker
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22
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2 answers

Half-wave diode rectifier - is textbook wrong?

I've noticed that in all resources on diodes and rectifiers, they show the output voltage as the positive half-wave of the input signal. However, that seems wrong. I understand that there's a voltage drop across the diode, and if the total voltage…
MightyPork
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22
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3 answers

DC biasing audio signal

I have seen a few different ways of adding DC bias to an audio signal. I have simulated them and they all give me similar results, but I can't figure out why choose A over B or C. My audio source will be a Line Level Audio -2V to +2V AC passed…
jsolarski
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5 answers

Can FPGA out perform a multi-core PC?

I don't understand how FPGA can be used to accelerate an algorithm. Currently I'm running a time consuming real time algorithm on a quadcore laptop so that four computations can be done in parallel. I have been recently alerted that FPGA may yield…
Fraïssé
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