Top new questions this week:
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The following circuit is from The Art of Electronics, 3rd edition: What I don’t understand in the circuit is the role of the 100 Ω resistor. The authors say that it: … serves to eliminate the “…
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Here is a picture from the datasheet of the LM386. Obviously, the input signal is swinging above and below the ground, but pin 4 is not connected to a negative supply. It is connected to the ground (…
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Using Microchip EREPROM 24AA02E48. Datasheet says it is a “2-Kbit I2C Serial EEPROMs”. In my eyes, 2KBits/8 = 256 Bytes. Storage is addressed in what they call “words”, addressable …
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I am trying to read a MIDI signal. I have used a logic analyzer to look at the signal: The upper picure is the note-on signal that should read 0x90 0x3C 0x7F. The lower picture is the note-off …
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I’m learning microcontrollers, and have picked AVRs to start with. In many AVR tutorials I find the registers are initialised by performing some bitwise operations on the assignment, for example …
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This is sort of the “circuit side” of a question I asked on a different subdomain regarding an RF amplifier that takes in 50 W and outputs 160 W (ham.stackexchange.com/questions/…
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I just bought a pack of 2222A NPN transistors from a local electronics shop. I found some datasheets online (e.g. www.onsemi.com/pdf/datasheet/p2n2222a-d.pdf ) that say the emitter-base …
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Greatest hits from previous weeks:
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Spring cleaning, and I’m trying to get power supplies for all my devices with missing power supplies. They’re all the typical barrel power connector, and I’m having a dickens of a time trying to …
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I am creating a controller for a 12 V system using an Arduino Uno microcrontroller. For the outputs I am using a relay shield to switch the 12 V components. I have a 12 V toggle switch that turns on …
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What is the difference between a latch and a flip-flop? What I am thinking is that a latch is equivalent to a flip-flop since it is used to store bits and is also equivalent to a register which is …
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I’ve seen lots of schematics use \$V_{CC}\$ and \$V_{DD}\$ interchangeably. I know \$V_{CC}\$ and \$V_{DD}\$ are for positive voltage, and \$V_{SS}\$ and \$V_{EE}\$ are for ground, but what is the …
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This may seem like a very simple question, but I’ve searched all over the place and haven’t found an answer. When jumping a car, we connect the + end of the charged battery to the + end of the dead …
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I have a couple of 12v batteries that I’d like to use to power a cooling apparatus while camping for several days. I also have a 15W solar panel I’d like to use to top-off the battery. Can I use the …
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Like most computer hobbyists and programmers, I’ve amassed boxes of USB cables to connect USB, Micro-USB, and Mini-USB to chargers, computers, and gadgets. These cables are a mix of phone charger …
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Can you answer these questions?
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I am designing an electrically small microstrip patch antenna, and its “radiative” near field (r = wavelength) reaches quite long enough for the whole imaging region. Basically, I don’t need …
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Does the output of a 120 volt AC to 12 volt DC LED driver differ depending on whether it receives forward-phase AC input or reverse-phase AC input from a dimmer? I’m curious because I have some LED …
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I am designing a low-cost soil moisture sensor with an RF433 radio. I put my sensor in a closed PVC tube for outdoor installation.(SIMILAR TO above image) Without the tube, I can transmit nearly 300 m …
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