Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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1500 questions
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7 answers

Wet Sponge or Brass Sponge for solder tip cleaning?

There seems to be a lot of differing opinions out there on what is best practice. A lot of people seem to be shying away from the wet sponge due to the thermal stress it imposes on the tip. I have personally always used the brass sponge only, but my…
CC268
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What is "drive voltage" for a MOSFET?

In the attributes of a MOSFET, Digi-Key lists several different voltages. I think I understand what most of them are, but there's one I don't understand: "drive voltage." Let's take this P-channel MOSFET as an example: So, there's "Drain to Source…
user31708
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Short circuit = no power?

Now I want to build stuff and I'm really interested in learning things (consider I'm starting from scratch). So I'm reading all of this website and the following line in this article got me scratching my head for some time: [about the power…
qreon
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Soldering PCBs directly together

I am attempting to replace an old PLCC32 part that was directly soldered to the board with a new part of undecided form. We will definitely need an adapter as we have not been able to find a PLCC32 part that does what we need. I cannot use a PLCC…
QuestionMan
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Purpose of 2 serial resistors on voltage divider

In the schematic/picture below, what is the purpose of 2 serial resistors for voltage divider? Temperature, thermal runaway, stocks, prices, or something else? Thank you. simulate this circuit – Schematic created using CircuitLab
Ugur Baki
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6 answers

Does water actually damage or only temporarily disable electronics until drying out?

Does water leave any damage after drying out? If it does, where and how exactly does it? How can it be repaired?
neverMind9
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Why I2C designed to work with pull-up resistors and not pull-down ones?

I understand that in I2C, SCL and SDA lines use pull-up resistors and the pin drivers are open collector NPN devices which can drive pins to ground. This gives I2C an advantage that the same bus now can be shared with multiple slaves, and even if…
Ashutosh
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Are DIP sockets against overheating worth the cost?

Sockets allow easy replacement of a device and eliminates the risk of damage from overheating during soldering. [Wikipedia] I personally never (ever) replace these ICs. For programming microcontrollers (as a hobbyist) I use a dedicated pin header.…
dusk
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How do I select the accompanying components for an optocoupler?

I'm using an optocoupler (MOC3021) to sense the On/Off state of an electrial appliance using a microcontroller ATmega16L. How do i go about doing this? My mains supply specs are 230V, 50Hz. How do I design the surrounding circuit and select…
David Norman
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Would a triangle wave have finite or infinite sinusoidal components?

A discontinuity causes a signal to have infinite sinusoidal components, but a triangle wave is continuous, I was taking a class in which an instructor said that since the triangle wave is continuous it can be represented by a finite number of sine…
Syed Mohammad Asjad
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2 answers

Maximum cable length for 3.3V UART signals

I would like to avoid using RS-232 converters between two microcontrollers on two different boards. For various reasons, only UARTs are supported, e.g. no SPI or I2C, and I will be using CAT5E cable to RJ45 jacks between the boards. The data rate…
QuestionMan
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10 answers

Are all electrical sockets of my house in the same phase?

Most countries use AC power that is supplied to each house. This AC power is in the form of a sine wave. Suppose I have 2 electrical power sockets in two rooms that are at the opposite ends of my house. Will both the electrical sockets provide the…
Rishi Sharma
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3 answers

How are CPUs designed?

I've started playing with electronics a while ago and making simple logic gates using transistors. I know modern integrated circuits use CMOS instead of transistor-transistor logic. The thing I can't help wondering about is how CPUs are designed. Is…
Overv
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Torque kgcm (what is kgcm)?

I know what torque is but I find difficult to understand what Torque: 3kgcm means ? I am not sure, how much weight that motor can carry, and I want to know how I can calculate that. Please give me some hints :)
Splendid
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Understanding the relationship between LoRa chips, chirps, symbols and bits

I'm trying to understand the actual relationship between LoRa chips, "chirps", symbols and bits. I don't mean just the equations that relate the various rates, but actually how these things relate quantitatively. The Semtech document AN1200.22 LoRa™…
uhoh
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