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H: Soldering flat audio cable
I was wondering if someone knows if it is unusually hard to do soldering on a flat headphones cable. I am sorry, I don't know how one is called, which is why I could not even find a replacement or any videos or how-tos. It's for Sony MDR-ZX600 headphones with a 3.5mm TRRS jack. The jack i... |
H: Where should I place the series termination resistor for AVSBus?
I'm dealing with a AVSBus interface (like SPI, there are CLK/MOSI/MISO signals).
The CLK may run up to 25MHz, so we'd like to add series resistors on the board, as a back up if we need to tune the SI later.
My question is, where should we put these se... |
H: What mean circle with letter on scheme?
I have connected circles, but I dont know what is this exactly and do I need them on a PCB?
thanks for feedback.
AI: The connection between (A) and (B) is a current shunt. The amplifier DA1 senses the voltage difference between (A) and (B) to measure how much current is com... |
H: Resistor near point-of-contact for better ESD-protection?
This question is about ESD-protection while installing/removing components (RAM, SSDs, etc.) inside a PC.
When grounding the GND of an USB-port to earth or to my wrist strap (as advised earlier) the moment-of-contact would be the moment i plug the USB-cable ... |
H: convert 20V .4A to 12V .4A
I am very inexperienced in electronics, so far I have just done real simple stuff with an arduino. I have a Nema17 (driven through a L293D) stepper motor which has a rated voltage of 12V and current of 0.4A. Now, my understanding of current and voltage is that the current solely depends o... |
H: Multiple feedback low-pass filter design
I'm trying to design second order multiple feedback low-pass filter with cut-off frequency at 1500 Hz and Chebyshev approximation.
Transfer function for this scheme is defined as:
Where:
And condition for real values of resistors:
However using Matlab and cheby1 function... |
H: What determines the orientation of a coupling/blocking capacitor in an amplifier circuit?
"In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuit can pass through to the next while DC is blocked. This technique helps to isolate the DC bias settin... |
H: How do I solve this network of diodes?
Here is the assignment:
The assignment is to calculate various values across the circuit.
Here are the important values:
\$R=3.3k\Omega\$
\$ U_1 = U_2 = 4 V\$
The diodes are ideal with the following current voltage relation:
Here is my thought process what I tried and where ... |
H: What exactly is a short circuit?
In my book there is no explanation of the phrase short circuit but at many places the author has used it. I had googled it. Some explain it as the flow of charge along a high potential difference while others explain it as the flow of charge along a low resistance path. What exactly... |
H: Load Cell has abnormal wire coloring
pulled a load cell from a small scale that I bought from amazon. I read online about how to use a INA125P to amplify the signal from the load cell, but when i examined the load cell i pulled from the scale, I found the wire coloring did not match that of the tutorials I read. I ... |
H: Transistor Switch with >0 OFF voltage
I am new to electronics so I apologize in advance for incorrect terminology.
I have an existing circuit which can be powered with either 13.4v or 14.4v. What I would like to do is treat that voltage difference as a binary switch, where the 13.4v power is OFF and the 14.4v power... |
H: What happens with the voltage and amperage when we have multiple batteries in either series or parallel?
Let's assume that I have 4 pieces of 9v batteries and some simple load like an LED. If it helps, you can assume there is no load at all.
Question 1 - What voltage and amperage can I expect on the output when I h... |
H: N channel depletion FET vs P channel enhancement Operation
As the title implies I am confused about the electrical characteristics of N channel depletion FETs vs P channel enhancement mode fets. Won't both of these devices act similarly as they both have negative threshold voltages? Thanks!
AI: Although both have n... |
H: How can I use an Indian 2.1 speaker in United States?
I purchased a 2.1 (2 speakers , 1 sub-woofer) Creative Inspire audio system in India a few years back. I loved the sound quality so much that I brought it all the way to United States, forgetting that the line voltage required to drive the speaker is 220V while ... |
H: Why is there a capacitor in the feedback path of a comparator, why is there a resistor on the input?
I am interested in charging a supercapacitor from a solar panel. I saw a circuit on this page by David Johnson. He doesn't let you copy the circuit, but the gist of it is this:
simulate this circuit – Schematic cre... |
H: Question about Thermocouple to digital convert output
I have a MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter. I have a question displaying the outputs on a LCD module. The FPGA board has a built into LCD module, so there is not much do to other than to tell it what to display for a given inpu... |
H: Resistor symbol in a schematic with zero value
I can't figure out the purpose of the 0Ohm resistor in bellow schematic. It's crystal oscillator configuration and why the designer have included a resistor there with 0ohms ?
Any idea ?
AI: So that a resistor can be added to prevent overdriving the crystal. You will ... |
H: Construct an 32 X 8 RAM using 4 of 16 X4 RAM chips
Note1: I know that the 16 X 4 memory contains 4 output lines. there is also a 4-bit input to construct the 16 WORDS.
Note2: The problem arises as the RAM 32 X 8 contains 8 output lines and 5-bit input. But i want to use 4 of RAM 16 X 4.
Question: What can i do abo... |
H: neutralize charge in series capacitors
I have a simple circuit as in the picture below. My question is why the negative charge -Q at the bottom plate of C1 moves and neutralizes with the positive charge +Q at the top plate of C2?
AI: The area inside the green circle is electrically isolated from the rest of the cir... |
H: Different types of LiPo batteries
While picking up LiPo battery for my project, I've seen that there are two different types: small and inexpensive one, like this one here that can be charged with a simple circuit like this one. And there are big ones like this one here that require special expensive charger like ... |
H: LM7805CV output voltage drop to 2.5v after connecting load
I've made a simple linear power supply for micro-controller with a transformer and LM7805CV as seen in the picture.
LM7805CV input voltage is 35V and output without load is 5V but after connecting a minimum load like an LED with 1K resistor output voltage ... |
H: I am getting question marks on serial while trying to read SD card
I am using SPI and I'm trying to initialize and read a SDHC card. In the terminal, all I get back are question marks scrolling across the screen. Normally, I would think this is a baud rate issue but I have tried different baud rates and verified th... |
H: How to Write to SD Card at high rate?
I have just started working on interfacing Nordic semiconductor's nrf52 with SD card using SDK 12.0. I have to write to SD card at a rate of 84 packets per second and each packet consists of 20 bytes. I am using fat file system which uses SPI protocol for writing to SD card.
I... |
H: How to build a FSK modulator and demodulator?
I want to build a FSK modulator and demodulator, the center frequency is 4.234MHz +-175kHz, FL is 3.951MHz, FH is 4.516MHz, mean data rate will be 564.48kbit/s.
After searching the web, I found that FSK modulator can be build with DDS or PLL, demodulator can be build wi... |
H: how is it possible that an inverter absorb reactive power
It's always said that reactive power is interpreted as magnetic field in motors (or transformers) it can also be the electric field in capacitor, but where does an inverter "store" that reactive energy?
AI: There's not a physical stock of reactive energy, bu... |
H: Conductive Adhesives?
I'm helping with a kid's Maker's project. We need to attach some LED's to some coin cell batteries for part of a holiday project.
Are there any conductive adhesives we can use for this? Durability is not a factor, since the life of the project will be no longer than the life of the coin cell... |
H: Is there any dynamic antenna for varying frequencies in 1 GHz to 10 GHz?
I want to use an antenna for my project and want to use it in the frequency domain: 1GHz to 10 GHz. Is it possible to use a single antenna with dynamic input range?
I read about reconfigurable antenna's but couldn't find anything concrete on i... |
H: Circuit and condition
My son is trying to solve contest tasks in physics. Among the questions, I found the following one
Let me translate.
Find measurements of current meters within the circuit, shown on the picture. Resistance of current meters to be considered as much lower than resistance of the resistors.
Powe... |
H: LTC3780 Test load for adjusting current limit
I use the LTC3780 for my variable power supply, it can handle 1-30VDC and 7A output.
In order to be able to view my current limit adjustments, i thought to create a momentary test load by using a 4.7 Ohm 50W resistor.
Do you think this is safe?
If not what other option... |
H: Speed and position controle of a BLDC motor at the same time
I want to know if it is physically possible for a BLDC motor to be controlled in speed and position at the same time.
Let me clarify : while the rotor is spinning (speed control), is it possible to rotate the stator backward or forward (position control)... |
H: short protection for LED strip
i'm building a white LED strip to mount above my kitchen counter. there is really nothing fancy about it: it's a 1.7m of 5V LED strip that i soldered an USB plug and mounted an on-wire switch to turn it on/off.it will be powered by an old iphone power adapter (hence the USB plug) and ... |
H: Why current gain of common emitter transistor changes with the change of transistor
I was reading a book on basic electronic engineering and there it said that if we replace a transistor with a new one and even if we keep all other parameters same for both transistors then also the current gain is likely to change.... |
H: Are they connected in parallel?
The question was to find the equivalent resistance between A and B. The correct answer is R. I too arrived at R by considering the ends of the lowest two wires equi-potent because the lowest wire has 0 resistance (and so according to V=IR, V comes out to be 0) and redrawing the circ... |
H: What is the use of a capacitor between Vdd and Vss (or Vcc and Vee)?
I'm trying to make my STM32 communicate VIA Can. Therefore I'm making use of the CAN transceiver MCP 2551. In many circuits I've seen a 100 nF between Ground and Vdd. What is the reason for that? Here an example:
AI: It's called a decoupling or po... |
H: DC supply voltage in op amps and instrumentation amplifiers
My question is very simple, i dont have much experience with electronics, and i am developing a project where i will use some operational amplifiers (TL081) and 1 instrumentation amplifier (INA118).
I'll need the TL081 to build voltage followers, and a Vol... |
H: Overlapping clock and data edges in multiple state machine designs
I have a general question about multiple state machine logic designs.
Think of a system having multiple finite state machines with a single clock and rising edged flip flops. These machines share some of their input and output data. So the outputs ... |
H: RS485 (MAX489) biasing
I am making an RS485 client device. The prototype is able to transmit and receive from a Modbus server successfully, using 2-wire (half duplex) mode. Full duplex operation is planned, but I haven't tried it yet.
Does the MAX489 require any pull up/down biasing resistors? I can find no mention... |
H: SMD capacitor package size and high frequency performance
I am designing a circuit with a Spartan6 FPGA and the documentation for the FPGA specifies 4.7uF (0805) and 0.47uF (0402) capacitors for decoupling. As I really do not want to solder 0402 capacitors if I can avoid that, I would like to use 0805 or 1210 size ... |
H: BC337 transistor appears to be in active mode, but has too small Vbe
I've stumbled onto something that I don't understand.
I've wired up a phase shift oscillator using a BC337 transistor (datasheet here). According to the datasheet, \$V_{BE(on)}=1.2\ V\$
However, using my multimeter (and after doing the theoretical... |
H: PIC18 MCU Relay Issue
I am having some strange issues with a PIC microcontroller (PIC18F45K22) driving a SainSmart 2 Channel Relay board (http://www.sainsmart.com/arduino-pro-mini.html).
After a bit of troubleshooting I have been able to isolate the issue. Whenever I have a load connected to the relay (a solenoid i... |
H: Do 74HCxx chips require a linear voltage generator?
Recently I've read a book that says it's absolutely necessary to use a linear voltage regulator like LM7805 in circuits that use any of 74HCxx chips (CMOS logical gates). I thought that this advice is kind of odd (LM7805 requires 9V instead of 5V I most frequently... |
H: Replacing an FT2232 chip with a custom microcontroller?
I want to make a circuit board having the capability of configuring (not sure if this is the correct term, but burning a VHDL design (svf, pof file generated by Quartus)) into Altera CPLDs and FPGAs from my computer.
I know a couple of ways of doing this. I ca... |
H: How to find and overcome run-time RAM corruption in a Microcontrollers?
How can I find and overcome any RAM corruption in a Microcontroller (ARM Cortex M0) during run-time?
For example what if two or three locations are corrupted, say 0x2E 0x2F,0x30.
How can I still let the system run by overcoming or ignoring thi... |
H: SIM900 schematic verification
I am designing a SIM900 schematic so before going further I thought of verifying the schematic first. I will using SIM900 with PIC18F2520. So to power the SIM900 and Microcontroller, I am using LM7805 for MCU and LM2576 for SIM900. Following is the circuit:
LM2576 o/p 4.1v is for SIM9... |
H: Setting up SPI with sam4s16c
I started programmer for Software and have a professional background with large software projects in c++ and QT. Now I changed the company and also have to write some low level hardware code and i have some starting trouble, messing around with tones of datasheets.
I am new to hardware ... |
H: Is electrical energy wasted when a device is fully charged?
Many a times I leave the laptop connected to the charger with the switch on for the entire day. When it becomes fully charged does it still consume electrical energy?
AI: Yes, some energy will still be consumed.
Assuming the laptop is switched off (not in ... |
H: Winding method of a toroid core
I find some text about the winding of a toroid core as below:
But what's the math and physics behind these?
BTW: Can someone suggest some good books about the design of an inductor/transformer not only in theory but also about "how to make them by hand".
AI: These winding instructio... |
H: Trace inductance
I'm trying to understand why the ground plane in PCB is preferred to be as wide as possible. Mathematically the self-inductance in a free space conductor has a relationship as shown in the uploaded picture:
But I want to understand the physical analysis of how is the increase of width will reduce ... |
H: Texas Instruments Schmitt Trigger inputs
Hi I want to use the TPIC6C595 in some project.
Because my application needs to be very noise insensitive I am wondering whether the shift register uses Schmitt Trigger inputs for G, SRCK, RCK, CLR, SER IN.
But after looking at the datasheet I could not find any information... |
H: Rising-edge or Falling edge Counter
When designing an arbitrary count sequence synchronous counter using kanuagh maps and either JK or D flip flops, does it matter whether the flip flops are rising-edge or falling-edge triggered?
AI: It doesn't matter
Assume you are designing a 1-Bit up counter Count_Pos Such that ... |
H: Electrical engineering beginners book
This maybe the wrong forum to be asking such a broad question but I'm looking for an EE book that was referenced by a friend years ago.
The whole book looks as though it were scanned copies of a notebook. It provided the fundamentals of electrical circuits along with what look... |
H: What are effects of attaching more antennas to Wi-Fi router via RP-SMA splitter
Theoretically and practically speaking what are effects if in typical Wi-Fi router attach more than one antenna per output using something like RP-SMA Splitter and or extension cable ?
In my case, Asus AC66U 802.11ac Dual-Band; 2 chips(... |
H: Why does the ADC require 3 wires instead of 2?
I'm very confused about ADC. I do apologize if these questions sound silly. I use ATMEGA328P for ADC.
Why is the negative terminal required for ADC to take measurements, if the ADC pin is already negative by itself?
Why does the ADC only take measurements when resista... |
H: AND gate, red wires logisim
I have these and gates. When I disconnect one of the red wires from its corresponding gate, the other goes green. But if they're both connected it goes red. From what I've read in the documentation, this means this carries an error value, but I don't see how that could be the case here. ... |
H: why does this conditional logic work?
I'm toying with outputs for an LCD on my FPGA. When I press the button, I want it to display the number 6. Instead, it is displaying 6 constantly, unless I press reset button, at which point the entire screen goes blank, which it should.
module LCD(CLOCK_50,LCD_DATA,LCD_RW,LCD_... |
H: Operating two wireless cars simultaniously
This is my first "serious" electronic project, so I apologize if my question is silly.
I tried to follow this tutorial to construct a remotely controlled car.
Moreover, I wanted to make two cars. Each one operated by its remote control
(to make fun with both my boys). I th... |
H: Rectifier voltage drop under load
I have a bridge rectifier that is converting 240v AC into approx 358V DC
The rectifier is smoothed by 2 X 10,000uf capacitors
Under full load, I am drawing 3000 watts on the DC side but for some reason the voltage drops down to 280V DC yet the AC side stays at 240
My question is wh... |
H: understanding constant current source circuit
The circuit is a constant current circuit which charges the capacitor C1. The C1 is periodically discharged through a resistor which is not shown in the image. During discharging, the constant current circuit is isolated (through a mux, not shown in figure).
Here is my... |
H: How to connect Aref (Avcc and Agnd) and where to place the bypass capacitor?
This is my schematic:
Should I connect a capacitor between the PIN 32 and GND Pin or AGND Pin?
From the AVR Hardware Design Application Note:
2.2.
Analog Supply
The AVR devices that have a built-in ADC which have a separate analog supp... |
H: Initializaiton of Hitatchi LCD
Trying to set up the initialization of the HD44780. Is this bad practice to have done it like this? Or is it going to try and send all those lines to LCD_DATA at once?
enter code here
always LCD_RW = 1'b0;
initial begin
LCD_RS <= 1'b0;
#15; //delay 15ms until set function
... |
H: 16MHz Crystal trace length
I can't length match the traces from my microcontroller to its 16MHz crystal. The trace length difference is quite different, as you can see. Would this be a problem?
AI: For a crystal connected to the internal oscillator of an IC, like you have, you don't need to match the track lengths.... |
H: Circuit to switch power between Battery and main Source for BLE Module
I am power a Bluetooth module (referenced as BLE) operating at 3.3v.
The module has a microcontroller inside and we want to keep the RTC working all time for scheduling, which means in case if the main power source goes down, the module will kee... |
H: While discussing eigen functions of LTI system, why we ignore the natural frequency term in response?
Consider the LTI system, a series RL circuit (initially at rest).
If we define voltage as input and current as output, whatever be the forcing function, output contains a component \$ e^{-Rt/{L}}\$ corresponding t... |
H: Can I use a Class D amplifier as a summing amplifier?
Context: I'm creating a mono, battery powered speaker. I'd like to sum the left and right channels of a stereo input signal into a mono output signal, which I feed into a Class-D Mono Audio Amplifier to drive the speaker.
The stereo-to-mono solution I've decided... |
H: Best design choice: linear regulator or switch converter
I need to power a Thermoelectric module with 10A maximum load current. I'm designing a card with a minimal design in order to change the current or the voltage across the load, given a standard voltage source.
I just need a minimal regulation of the load, whi... |
H: resistor value in wheatstone bridge
I have a resistance based sensor which gives the resistance change when the strain/force is applied. How to measure the unknown resistance change using the Wheatstone bridge circuit.? I mean what are the important things we have to keep in mind while selecting the resistor value.... |
H: Sending a radio wave from one micro-controller to another
I have two ATMEGA328P's. I would like to be able to send a radio wave (no data/sound/modulation, nothing, just the carrier wave) from one micro-controller and get the other micro-controller to pick it up using ADC.
So far I've been able to pick up random EMP... |
H: SPI clock source - master or slave
I was working on the SPI protocol and have some few questions regarding the SPI clock. I know that master always initiates the clock to start the communication.
Does the slave use this SPI clock generated by master or does it synchronize its own SPI clock with the SPI clock genera... |
H: How to get rid of voltage spikes in this supply voltage switcher circuit?
In my mainboard there are two main supply.
One is 12V and other one is 5V.
5V is always ON but there is a risk of 12V crashing and disappearing. So, I want something like this, when presence of 12V main supply always has to be 12V but when i... |
H: Voltmeter vu-meter dynamo
To start, I have no experience with electronics except what I've been googling the past week. What I'm having issues with is finding a way to make a voltmeter that functions like an led vu-meter would.
What I'm making is a gear driven dynamo and I want to make a visual representation to s... |
H: Constructing a 4-way multiplexer composed of 2-way multiplexers
I've constructed a schematic of a 2-way multiplexer, and also have made a 4-way one (and have a good idea of how to make 8, 16, etc. ones).
However, my 4-way isn't a composition of 2-way multiplexers, and my goal is to make it as "composed" (for lack o... |
H: What are these boxes mounted inline on each of the 3 phase wires of a high voltage power line in Miami?
They were only on this run and not any of the lines in the area. And what is the function of the flat u-shaped guards in front of each?
AI: It's a fault circuit indicator. Specifically, it's the Sentient MM3 mod... |
H: Motor in a parallel circuit slowing down, how can I speed it up?
I have a simple circuit, with 5x 3v/20ma LED's in parallel (each with a 330 resister in front of them) and a dc motor (rated 6v to 24v) also in parallel, all running off a 9v battery.
The problem is the motor is slowing down thanks to the LED's. I wo... |
H: Implementing a simple 1/s integration in PSCAD while it only offers 1/sT
So I'm doing some modelling in a power systems simulation software (PSCAD)
I'm using the integrator block in that software.
Now unlike SIMULINK PSCAD doesn't offer a \$ 1 \over s \$ block but offers a \$1 \over s*T\$ block where \$ T \$ is the... |
H: How does AVRDUDE communicate with the programmer?
I'm trying to understand exactly how AVRDUDE communicate with the AVR Programmer, for example USBtiny or Arduino itself as a programmer, to send the firmware to the microcontroller.
As a motivation to my question, suppose that I want to build an USB In-System Progra... |
H: limit LED current only with transistor and base resistor
I'm bit exciting about my new plan here, my goal is to make a small and simple 5W LED driver with Arduino. I know about current limiting resistor in series with led or in emitter pin of transistor, but just curious, can i driving LED with only transistor and ... |
H: Very low temperature (-25C) on ds18b20 precision
I'm busy building a multi-probe temperature sensor and log system using a couple of ds18b20 probes on a Raspberry Pi.
They will be monitoring freezer temperatures that should be between -23°C and -18°C.
I'm a little concerned about the precision of the probes though ... |
H: Electro-static potential of a capacitor during a transient?
How would I calculate the electro-static potential for this simple circuit during the transient (during the time the capacitor charges)? Do I just use Ohm's law?
simulate this circuit – Schematic created using CircuitLab
My thought process was as follows:... |
H: Are my calculations for flyback diode/s corret?
I have looked up some existing questions and did my own calculations for my own problem.
I am switching a relay with a BJT transistor and would like to protect the transistor from voltage spike on relay coil, after the transistor stops conducting.
Circuit:
I decided ... |
H: How to step down analog sensor signal voltage using voltage divider
I am trying to work out how to use a voltage divider to step down the signals from an analog sensor, powered by a standalone XBee.
The XBee provides 3.3V power to the sensor, which has 3.3-5.5V operating voltage. The output voltage of the sensor is... |
H: How are two atomic clocks synchronized?
I want to synchronize two atomic clocks at the same location to the same time... then let them run independently of each other (then I'd move them apart).
Is there some standard procedure to accomplish this?
Do standard atomic clocks come with inputs/outputs to accomplish th... |
H: Chip Identification - Electronic sound toy
I just bought this toy called fridgezoo. It's a small plastic animal that you put in the fridge. It has a light sensor and a button. As soon as there is light, it plays a sound, and when you press the button it plays another sound.
I figured that it may be possible to hac... |
H: Cleaning Up a 5V Line Pulling 1 Amp
I have been working on a project that utilizes a 10MHz Oscillator and 28V input power. At the start of my project, I used a DC/DC converter which took my 28V line and moved it to a 5V line. I then used this line to power my Oscillator. After hooking this up to my scope, I saw tha... |
H: How can I combine two antennas that carry different frequencies?
I have two antennas:
antenna 1 carries CATV signals channels 2-29 which I believe use carrier frequencies from around 55.25MHz up to 253.25MHz
antenna 2 carries OTA HDTV signals on UHF channels 21-49 which I believe use carrier frequencies from arou... |
H: Etching using Sodium Persulfate, Is my photosensitive board too old?
I am trying to etch my first PCB ever, I have used the inkjet transparency method to expose my photosensitive Bungard board and developed it using Sodium Peroxide. This part of the process seems to have gone well, I can see the traces clearly on t... |
H: what does DC Com mean?
I have a international Power Sources Model PUP110-40-S power supply, I think its somewhat generic, that provides +/-12VDC,+/-5VDC.
The unit has failed, and I am attempting to replace it with an ATX PC power supply.
There is a diagram, on the bottom of the Power supply that tells you the volt... |
H: Setting up KCL equations for non-ideal op amps
I don't understand how to set up the KCL equations for this. It seems as if it would be \$\frac{-v_d - V}{R} + \frac{-v_d}{R} + Q = 0 \$ and \$-Q + \frac{V_{out}-Av_d}{R_o} = 0\$, where \$Q\$ would be some relationship between \$-v_d \$ and \$V_{out}\$, but I don't u... |
H: 12-bit DAC Output to +/-10v Signal
Suppose we want a +/-10v control signal, where 0x0 (to the DAC) = -10v and 0xFFF = +10v.
Firstly, how do we alter the signal so that we can have a negative voltage, dependant on the DAC input?
Secondly, how can we scale the signal so that it fits within the -10 to +10 range?
AI: a... |
H: How to convert current obtained from CT to precise voltage applied as input to ADC?
My aim is to convert current obtained from CT to precise voltage that can be applied as input to ADC.
As shown in the diagram , a conductor carries current of up to 63 A passes through the Current Transformer(CT) .The CT CT 127... |
H: What do the values on the back of an encoder mean?
I have an encoder (at first I thought it was a potentiometer!) and on the back it has B1 03 (separated).
Research thus far has shown that an encoder can have anywhere from 100 to 6000 steps. I imagine those numbers are related to that value, but I do not know how ... |
H: Is it theoretically possible to be killed with coin cell batteries?
Other than the obvious eating them, is it possible to squeeze enough electricity out of a coin cell battery to cause harm? Maybe using a boost converter with a large capacitor? Or maybe using a bunch of them in series?
AI: A CR2032 holds about 2400... |
H: Many-pins & still-simple IC, how to prototype with it?
I'm building my second project, it will use TI TVP5146 video decoder, which has 80-pins, and TI Tiva C. What prototyping accessories will I need? I think it can be clearly stated what such many-pins & still-simple IC needs. I must avoid re-ordering because of v... |
H: How do you create a variable load on something like a wind turbine?
Looking over how wind turbine controllers work, it looks like they use something called "Maximum power point tracking", or "MPPT".
As I understand it, that involves changing the load on the wind turbine to extract more or less energy, and thus cont... |
H: Some Problems in a power amplifier circuit with THS3091
Recently, I designed a power amplifier circuit with THS3091.
The schematic diagram and PCB of the circuit are just the same as the layout example of the datasheet of THS3091 in page 39. But some values of the resistance are not available in my lab. So the mod... |
H: Series Wound DC motor Runaway when going downhill
I understand that Series Wound DC motors are used in traction applications like golf carts . and that these motor suffer an effect called runaway ( if no load is applied the motor increase its speed until something breaks)
I have a scenario in my head that i cannot ... |
H: Cheapest dummy load? 450w, 15V, 30A, only for a few seconds
What is the cheapest and simplest way to dummy load 450w, 15V, 30A, only for a few seconds?
I would like to measure the max output capability of an MPPT charger controller, basically as a "all losses included" way of measuring actual solar panel maximum po... |
H: Connecting 12V fan to LM317 DIY PSU circuit
I am working on a simple adjustable DIY power supply using an LM317 voltage regulator. J1 in the image below represents the transformer rated at 18VA, which rectified produces about 25V DC. The output range should reach roughly 12V, 1A.
Interestingly, I've found a 12V DC ... |
H: Low domestic voltage inefficiency cost
Since lower voltage means proportionally higher current for a given power, and higher current means more impedance, presumably having a lower voltage at the outlet means transmission power losses are greater than if a used a higher voltage.
How much more energy is lost per yea... |
H: Neutron Single Event Upset (NSEU) how its effect is mitigated in electronics in space vehicles?
Since in the outer space the NSEU will be more common than in the earth, how the electronics in space vehicle is tacking the issue. I feel a solution will be existing for some decades but on google I got some information... |
H: Open Collector/Drain vs Push pull
Given the situation where an LED is being used for a status indicator or similar, not toggling quickly.
Which is the best configuration for the IO pin, push pull or open drain? As I see it either will work, and I don't see any benefits to one configuration over the other.
U1 in the... |
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