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H: Separating odd and even pulses in a pulse train
How would one go about separating odd and even pulses in a pulse train and displaying them using LED indicators?
A schematic would be of great help.
AI: A counter circuit would do the trick. Increment count on rising edge of pulse, output is the LSB of the counter. A ... |
H: getting interrupt from ignition circuit
This transistor ignition circuit for a model petrol engine is built from a proprietary kit. I have made it up and it works.
Now I want to take a signal from it as an external interrupt to an Arduino Uno based tachometer. But I don't know how to connect it. Ideally I would lik... |
H: Current through an ideal inductor at steady state
Find the current through the \$\mathrm{5 \space mH}\$ inductor when the circuit reaches a steady state
When the circuit reaches a steady state, a current of \$\mathrm{4 \space A}\$ will flow through the resistor (since voltage across the inductors are zero). The ... |
H: Alternative to train current collectors (pantographs)
A current collector (or pantograph) is a mechanical system used by, for example, trains and trams, to collect current from an overhead wire.
When thinking about high-speed trains, e.g., the Shinkansen, but also with lower speed trains, there must be massive wear... |
H: Trying to identify this potentiometer marked "B5K"
I'm trying to identify this potentiometer as accurately as possible:
On the rear it says: B5K.
It has two rows of 3 pins each:
(1,2,3)
(1,2,3)
Below are some measurements taken with my multimeter between pins 2 and 3, and the unit is: kΩ.
When taking the measurem... |
H: How to use PoE to power an additional device?
I have an Ethernet (100 Mbps) camera powered through PoE by a PoE enabled switch. The camera is turned on and shut down by configuring the switch to cut the power on and off on the given port.
I want to have a visual indicator that the camera is on. So I did the followi... |
H: How is dead time in a half bridge implemented
I was wondering if dead-time in a bridge design is achieved by the turn-on and turn off resistors as shown below, so that the FETs turn on slower and turn off faster, thus avoiding shoot through. Or does this need to be implemented in code?
AI: Or does this need to be i... |
H: Why "substrate" is exposed through a "do not connect" pin at all?
I've were reading through MOC3041 opto-isolated triac when I noticed this part:
"Substrate". It's also repeated later on one page down further, but there's no explanation. I guess that might be the silicon substrate upon which the device was build, ... |
H: What do the boundary modules do in an IC?
I cannot understand what is the purpose of digital and analog boundary modules embedded in an IC for testing. What are their function?
AI: They are basically switches that allow any two pins to be connected to the internal test buses AB1 and AB2 which are then brought out t... |
H: Second order differential equation implementation using OP-Amp
I am trying to implementat the following equation \begin{equation} x''+4x'+25=\sin(20t+36) \end{equation}
using OP-Amp's. I tried to use state-space technique to implement it in the below circuit
x is the voltage of output node of up-right OP-Amp. But ... |
H: How to solder wires onto pins of an RFID chip?
I want to integrate a sensor with NXP's NHS3152 (datasheet). To do this I have to solder the wires onto the pins of the RFID chip.
What tools should I buy to do this?
What is a good reference to learn how to do it?
AI: Buy the $50 NHS3152DBUL evaluation board (Availabl... |
H: Capacitor calculation for current pulse to solenoid
Let's say I have a power supply 48V/100mA (4.8W). However, I have a push pull solenoid which will draw ~8W (48V/170mA) for about a 50 mS pulse. Can my power supply provide this extra power for that time with a proper capacitor, or do I need to increase the nominal... |
H: Routing 5 differential pairs over a short distance with limited space
I have 5 differential pairs (4-lane MIPI-DSI) going from left (SOM header) to right (FPC connector). As you can see on the right, for each lane, the signals end on opposite ends of the FPC connector. This is -unfortunately- a given, because the p... |
H: How to detect when an LED has burned out?
I'd like to have a way to detect when a low power LED burns out (2-3.5V, 200-400mA) that is being driven using PWM from a Raspberry Pi with a MOSFET.
My understanding is that I would be able to accomplish this by measuring the current to the LED and seeing if it is near zer... |
H: How to convert high impedance / ground output to 24V / ground output
My background is from software development so please forgive my ignorance. I have an Adam 6156EI device I can control via Ethernet, it has 16 digital outputs. When I programmatically set an output to "true", the respective output becomes "ground... |
H: How can a system reach its steady-state if the I-action of a PID controller, u(t), doesn't go to zero as the system approaches its desired value?
The I-action of a PID controller, which integrates the error over time, results in the control signal:
$$u(t) = \int_0^{t}e(T)\text{d}T$$
This means that, when the syst... |
H: 2N3904, Power Supply & FuncGen results on strange output on the scope
I was having trouble with a Collpitts oscillator output, it was distorted, so wanted to check if I am indeed in the linear region of the transistor, so I decided to use the func gen to check that.
However I am getting some strange reading on the ... |
H: What is the max current from a 9 V battery?
Let's take, for example, a 9 V battery. Forgetting about internal resistance or any temperature restrictions, what is the maximum current I can draw from this?
Using Ohm's law with a 1 Ω load, this should give us:
V = I/R
I = 9 V * 1 Ω
Current = 9 A
According to my calc... |
H: Is an even number of DRAM chips required?
I want to design a microprocessor based board (NXP imx 8m). All the boards I've seen so far have an even number of DRAM chips. If I want 4GB of RAM, do I have to use two 2GB DRAM chips or can I use one 4GB chip?
AI: The number of DRAM chips is determined by the width of eac... |
H: Collpitts oscillator signal distorted
I am trying to build a Collpitts oscillator using an 8MHz crystal, but the signal I get, is completely distorted. Any idea why?
The yellow signal is probed at the output, while the pink is probing the base of the BJT.
To start with I thought the problem was that my BJT was not ... |
H: What is the most power hungry component of a air conditioner?
Im taking about those old school air conditioners, which draw around 1200 watts from the wall.
AI: The compressor motor, followed by the evaporator fan and the condenser fan (if any), then any control electronics. |
H: Performing integration using hardware instead of software
One can compute the integral of a function using software, specifically one can get add doubles to obtain an approximate integral -- this is fast but suffers from rounding errors, or one can use arbitrary precision -- this is precise but generally slower.
I... |
H: Op-Amp Integrator's virtual ground
I have been using op-amp TL072C in charge integrator configuration.
R = 1k Ohms and C = 100 uF.
Vin is a DC signal of 1 V.
VCC = 10 V and VSS = -10 V.
I get the expected output which is VSS, when a DC signal given as input.
But the strange thing is that virtual ground voltage... |
H: LDO output and input capacitor clarification
I would like to understand how to size the input and output capacitor of an LDO.
What I think to know:
About the input capacitor:
The input capacitor is used for filtering high frequency input components.
Nevertheless in a perfect LDO, the drop voltage across the P-... |
H: CAN - Tranceiver @ 5V VS Tranceiver @ 3V3 Immunity
I would like to change a 5V CAN transceiver on my board into a 3V3 CAN transceiver. Nevertheless as I am clearly not a specialist of the CAN protocol, I am afraid of doing a big mistake ! I think it will clearly make the communication less robust if I reduce the po... |
H: Looking for some help with SMD Component identification N51K
I've got a faulty GTX 1070 Graphics card here with a blown SOT-23 casing IC. Looking at it you can se N51 and looking around on the board I can find another component like it with N51K.
I cannot however figure out what the component is? It looks like a tr... |
H: How to prevent switching direct and/or inductive noise on a PCB?
I'm designing a power source for one of my projects and I couldn't find a better way to reduce the voltage drop on 7805 regulator other than using a switching regulator (LM2596).
The switching regulator output goes through an additional LC filter (wit... |
H: Can continuity test cause component damage?
In order to test some tracks on a mounted PCB, I would like to use a multimeter for continuity test.
However, then I measured the open-circuit voltage of two multimeters at hand, and the results were:
Fluke 87 V: 7.3 V
Keysight 34465A: 9.4 V
Both have a current limit of... |
H: What is the blue film that covers the PCB in my TV's remote?
As a weekend project I am trying to fix my TV's remote and I noticed that the contacts of the remote's keyboard is covered by a thin blue film:
As you can see, the remote's PCB is covered by a blue layer of some sort of film. I wondered what is this film... |
H: What is the purpose of these coils in contactor auxiliary contacts?
Can someone please tell me what the function of this module, and more specifically, the curley wires on top of this contactor? It looks like the wires go to the same terminals as the main contactor terminals (although I didn't test continuity to co... |
H: Hall effect current transducer schematic diagram
What is the function of the amplifier 2 in the below circuit diagram?
HCT-0016 Hall Effect Split-Core Current Transducer: https://www.magnelab.com/products/hall-effect-split-core-current-transducer-hct-0010/
AI: You have given no context or credit for the schematic ... |
H: 220V Home Automation PCB
I recently designed my first PCB, which uses an ESP-01 to control 4 relays. I planned to use this to control my home appliances, which run at 220V. But I made a rookie mistake, instead of placing screw terminal width holes for the relay's COM, NO and NC terminals, I placed standard 2.54 mm ... |
H: Is there a component/method that can take any signal, then increase it to 5 volts no matter how small the signal is?
I was using a logic level MOSFET that should turn on when a voltage other than 0 volts between two points is detected. My problem is that the voltage is at times less than 5 volts and probably won't ... |
H: Hidden wire detector, using resistor
We have on the collector of the first transistor is a resistor at 1000 ohms , could you tell us what function this resistor performs in this place and how to argue that it is at 1000 ohms
AI: Having built numerous multi-stage bipolar amplifiers as a kid, I'd wager this resistor ... |
H: How to design a discrete linear regulator with an opamp and an N-channel MOSFET?
So as far as I understand, the basic idea of a linear regulator is to use a series-pass element along with an opamp with negative feedback to stabilize the output. This is what I usually see as an example:
simulate this circuit – Sche... |
H: Transformer secondary winding resistance
I am struggling to understand how to model a resistance loss of a transformer secondary winding. In a typical flyback converter, if the primary and secondary transformer have a resistance loss, how do we model the the secondary transformer resistor during the second interval... |
H: Low cost op-amp with Common-mode input voltage range of 1.125V
I'm developing a project where an op-amp is configured to bring a input voltage difference ranging from 1.8V to 3V to a output voltage ranging from 3V to 5V. The output of the op-amp will be fed into a ADC input of a MCU. the circuit looks as follows:
... |
H: Hidden Wire Detector, Oscilloscope Measurement
We have a hidden wiring detector device
I used 2SC1815 transistors and the value of R was 1K0. My antenna was made of 300 mm length copper wire with diameter 0.3 mm. I've measured its inductance - it is about 2 uH.
When we connect the oscilloscope to the base of the tr... |
H: Is there such thing as an active-low, logic level mosfet?
I need to make a logic level switch that will turn on when the input signal is 0V (active low). I figured using a MOSFET is the best way to go, but I'm not so sure if there are active low MOSFETS.
AI: I need to make a logic level switch that will turn on whe... |
H: Will two 18650s in parallel double the total max continuous discharge current?
Let's say a 18650 cell is rated at max continuous discharge of 8A . Will having two in parallel make it 16A?
AI: If the two cells are exactly the same...exactly the same voltage, exactly the same internal resistance, exactly the same dis... |
H: Good APA 102, SK9822, WS2812B alternative?
I know it's an old question but many posts about the issue are several years old, so maybe the market has changed since, hence my question:
I'm designing a Raspberry Pi compatible device for a client similar to an already existing device, which uses APA102 SPI controlled L... |
H: LTSpice .DC syntax error
I got this error
Syntax error in .DC command.
expected sweep starting value of source 'sweep'
I have no idea about how the syntax works. I only resorted in asking this site because it was urgent
And here is the code in question:
FILE: p-Enhancement ISFET Model
****************************... |
H: USART and ATmega RX Problem
I'm trying to understand how USART of ATmega works. I read some pages and I've picked information about it. To test functionality I've written this code:
#define F_CPU 16000000
#define BAUD_RATE_115200_BPS 8
#include <stdint.h>
#include <avr/io.h>
#include <util/delay.h>
#include <stdi... |
H: Analog values without Adc STM32
I have a STM32WB55CGU6 where I have all my ADC pins used up and im trying to obtain the battery level using a pin which does not have a ADC (PB6) which is branched as shown in the picture:
This follows the principle where it will charge and discharge following this link :
link
This... |
H: What does Nu (ν) prefix mean?
Stumbled upon this in ZVN4525E6 datasheet:
Zero Gate Voltage Drain Current (IDSS): 35 νA @ VDS = 250V, VGS = 0V
The letter is U+03BD and it is not in any common unit prefixes that I know.
My guess this is either substitute for "nano" (since capital Nu is "N"), or some weird expression ... |
H: Can I can control an RC servo using only a 5VDC and GND signal?
I'm working on an application where I want a servo to open and close a hatch. Because I only need the servo to operate in two positions, I'm curious if I can forgo the PWM aspect and just supply a 5VDC and GND signal to toggle between two positions.
AI... |
H: Linear dropout voltage transfer function
I am reading this application note from Texas instrument : http://www.ti.com/lit/an/slyt187/slyt187.pdf?ts=1591543592096&ref_url=https://www.google.fr/. The application note give us the transfer function Vout/Iout of an LDO built with a PMOS. Here is the model :
Here is the... |
H: Formula question about the Bridge and full wave rectifier,where are these number from?
i learn something formula of Bridge and full wave rectifier from my book
DC voltage \$V_{DC}=V_m-\frac{V_{r_{(pp)}}}{2}\$,\$V_m\$ is the amplitude of sine wave voltage, \$V_{r_{(pp)}}\$ is the peak to peak voltage of ripple wave... |
H: Name of this crimp connector?
What is the name of this crimp connector? It looks like a spade connector (female) with a missing tail. In the picture, it used to attach a thermal fuse. Does it require a special tool to install? Can you make your own by repurposing a spade connector...
AI: This kind of crimp splice c... |
H: How to make my sound reactive LEDs with Tip31C work?
I am building a rhythmic LED headphone prototype, but unfortunately I am missing something or am doing something wrong because my project is not working properly.
The project is as follows:
I bought
A pair of one dollar headphones.
Two tip31c transistors.
One pa... |
H: How does this BJT biased with a diode work?
I'm trying to teach myself some basic electronics and I'm stuck on understanding what's going on with this simple NPN transistor circuit that is using a diode for bias.
I've simulated the circuit with SPICE and I get a base voltage of about 0.61 V and a collector voltage... |
H: How to make circuit to reverse dc motor direction with a 12v+ trigger wire
I have a motorized retracting front license plate on my car that works great via a double pole momentary switch currently. However I really would like to make it automatically work when the car starts.
It is very hard to modify the device... |
H: Type 3 compensator design for Buck-Boost converter
I'm practicing a design of a type 3 compensator for a voltage mode buck-boost converter, so I went through the book entitled "Switch mode power supplies Spice simulation and practical design"
The topology used for calculations of the different components of the com... |
H: Increase amps with set voltage?
If I had a battery that is 50ah at 30V, what would I have to do to increase the current rating to 150ah, while maintaining the same voltage?
AI: 150 Ah is a capacity rating, not a current rating. You may well find your existing battery can already deliver 150 amps.
If you want to inc... |
H: Does 7905 needs minimum load current?
In the 7905 negative voltage regulator datasheet, it didn't mention that it needs a minimum load current to operate.
The 7905 that I have is outputting -7 V but adding a ~2 mA load causes the voltage to drop to nominal voltage -5 V. Input is -15 V.
Does a 7905 need a minimum lo... |
H: open wire detection of open drain output
I am working with a commercial dc motor speed controller it has a open drain output which can be used for generating fault signals , i am taking that output to a pcb through wire , i am giving it a pullup to use the open drain output as logic level output .whenever there i... |
H: Effect of high impedance Opamp buffer on current lost
In the below figure, end-user have the choice to output 4-20mA or 0-10V (using MUX control by uC), I have inserted high impedance buffer(The part number is not correct) with the voltage divider to reduce 0-10v output to 0-5V so ADC can read it (can also reduce t... |
H: PSoC PWM for driving LED
I'm trying to implement an LED driver and I found the next circuit in PSoC's Guide on how to use the GPIOs.
Thing is I don't get if it's a must to include the R3 resistor and the Q2 transistor or if it's enough configuring the Pin_4 as Strong Drive??
thanks!!
AI: If the R_2 value is large e... |
H: Ambiguity about concept of baud rate and bit rate
I know that there is lots of questions and answers that is related to this topic, but i can not clearly and distinctively find answers to my questions, yet. In addition i found some answers which seems to be contradictory to each other.
I know that baud is number of... |
H: Magnetization Inductance vs. Transformer Inductance
what is the difference between transformer inductance and magnetization inductance, as I know transformer inductance is calculated with magnetization current but I've never seen magnetization inductance calculation.
AI: The transformer primary, in the absence of a... |
H: How to control LCD monitor with micro controller?
I would like to control my PC monitor.
After disassembly I found the control buttons are implemented like this (just more data line and buttons)
I would like to control it (with ESP2866)
With the first button which is alone in a DATA line 1 there is no problem I j... |
H: DC-DC converters and heat generation
I've bought this 12V to Magsafe 2 85W car adapter so I can charge my MacBook Pro off of my auxiliary batteries without having to keep the inverter on (more efficient). If I understand correctly, this is using a DC-DC step up converter to take the voltage from 10-14V up to 20V. T... |
H: Simple Fire Alarm Circuit using transistor not simulating correctly
there am student of BSSE but we studied Applied physics, our teacher give us project.
Am working on it but when i simulate it, this gives me error at Transistor and Speaker.
here is my circuit
https://crcit.net/c/738382510e074fd987eb47e2a8859541
T... |
H: Variac Vs Motor Control
I am a beginner. I want to purchase a variable AC power source for my personal lab, and I am having a lot of difficulties getting a good variac in my region whose shipping cost is not 5 times the price of the device.
However, I noticed that variable motor speed controls basically work the sa... |
H: Simple security Alarm incorrect schematic diagram
I am a student and my Applied Physics teacher gave an assignment to create a schematic diagram of a security alarm. The main Components are,
Switch (Simple on/off)
SCR C106B (Silicon Controlled Rectifier)
10 KΩ Resistor
Buzzer
9 V Battery or DC power supply
(Note:... |
H: DC buck Convertor
I want to power SIM800L which requires around 4v and 2amps(at peak only). If I attach DC buck converter to Arduino Uno 3.3V output, and power SIM800L, is it safe?
AI: Buck converters step down voltage.
Boost converters step up voltage.
The 3.3V of an arduino is limited by the arduinos regulator an... |
H: How this circuit with diodes can be solved?
Solve: $$U_1=?\ ,U_2=-U_3=?,U=?$$
I tried to solve this circuit with Shockley Diode Equation : $$I_{\mathrm{D}}=I_{\mathrm{SAT}}\left(e^{\frac{U_{\mathrm{D}}}{\eta^{U_{\mathrm{T}}}}}-1\right)$$
and also with equation for dynamic resistance(for this example its conductanc... |
H: Simple LC circuit implementation
I'm implementing a very simple LC circuit where the power supply is connected to an inductor (of 4 micro Henry specifically), and the inductor is connected through a diode to a capacitor going to ground (of 1 micro Farad). I was expecting that the capacitor will accumulate twice the... |
H: Does it matter if power is applied only instantaneously?
If I build a railgun and apply say, 1 million watts, to the circuit to try to power a projectile forward through electromotive force, will it really matter if that 1 million watts of power is applied for just an instantaneous time say, 1 picosecond? Will that... |
H: How does the HX711 circuit work?
This scheme will be designed for weight scales. Why is there a transistor installed.
And I want to understand why need capacitors and resistors in this circuit. (their purpose)
The documentation does not describe the connection diagram, there is only an example of connecting to a lo... |
H: Understanding the statement: An antenna with 20 degree beamwidth has 20 dB gain
It is known to us that as gain of an antenna increases, its beamwidth becomes narrower. Is there any formula to support the above statement?
AI: An antenna with 20 degree beamwidth has 20 dB gain
That is an approximation
In reality an ... |
H: Energy Harvesting application capacitor selection
I have an energy harvesting application and I want to use a capacitor to store energy. Due to the application being very low power, a capacitor of around 50uF might be enough. What is really important though, is to have the lowest discharge possible, since the charg... |
H: MOSFET load switch design help
I would like some assistance designing a MOSFET load switch for use in an 12 volt automotive circuit to run a fuel pump controlled by a raspberry pi.
I would like for it to be able to deliver 25 amps continuously no heat sink if possible. I have a P channel MOSFET in mind the ATP304. ... |
H: Amplifier design using BJT
For the circuit above $$Vc=16V, β=200,
VT =25mV \quad and\quad |VBE|=0.6V $$ are given. I want to design a circuit with following conditions
The current on \$R_1\$ will be 0.1*Ic1. Pmax (DC maximum power consumption) =10mW
there will be no resistance value higher than 600kΩ
I tried to ... |
H: Using a MOSFET array to create a basic H bridge
I still have this big old rc car and i wanted to make it live again since I lost the radio. I wanted to take the UPA1556AH that is inside the rc to make a H bridge and control the servo motor direction so it can turn (it is not the best idea but i don't want to wait f... |
H: Where does the Panel Mount BNC Connector make the ground connection to my PCB?
This may be a dumb question, but where does the PCB make a connection with the signal ground on this BNC connector? All I see is the signal pin that is soldered on (via solder cup) and no where is there the possibility to solder to a ref... |
H: Friis transmission equation: how do I consider power loss along other directions?
I do not understand a basic concept about Friis transmision equation between two antennas:
where Dt and Dr are the antenna directivities (with respect to an isotropic radiator) of the transmitting and receiving antennas respectively,... |
H: How does this circuit work? (TP4056, DW01)
Why are capacitors C13, C12, R20 used here?
And why resistor R18 and C5? (What function do they perform?)
I don't understand why they are installed there.
Datasheet:
TP4056,
DW01,
FS8205A.
AI: Capacitors C5, C13, and C12 are bypass or decoupling capacitors used to suppress... |
H: What is the origin of multiplicative noise from a DSLR sensor?
I'm trying to understand the behavior of my DSLR camera sensor (Canon 80D). I've taken a picture of a gradient from top-right to bottom-left corners of a square. This square is positioned at the right-hand side of the picture, so that it'd be easy to ju... |
H: Why an ideal LC oscillator has a highly damped response in Spectre but not in PSpice?
I'm just curious about why a ideal LC oscillator (See Figure) has a damped response in Spectre Simulator but not in Ngpsice. In both cases I'm using 5V of initial condition. I'm also using gmin=0 and gmin_in Spectre in order to av... |
H: Reading +/- 12V with 3.3V micro
I have 3.3V micro and +/- 12V square wave input I need to measure.
As my MCU can only read 0 to 3.3V, I would like to ask the best way to "translate" this +/-12V signal into 0 to 3.3V.
I try to read but there are many many solutions and I can't figure out which is better to do.
I'm ... |
H: How do Eddy Currents manage to "flow"?
I know, there's an overwhelming amount of information on the Internet about what eddy currents are, but on the fundamental front, I simply fail to grasp how currents could circulate/or even exist in a piece of metal. I always thought that in order for current to flow, conducto... |
H: Pull Up Resistor Value for temperature sensor
I read that there needs to be a pull-up resistance for dht22 when connected to arduino. When dht22 is close, arduino's internal resistor value is enough, we have to add external resistor. I want to know the exact relation that for X-meters, you should add an external re... |
H: Inductor with high Q-Factor for low frequencies
I am a little bit confused by the types of inductors you can buy. After looking through numerous datasheets, it seems to me that most inductors have a high Q-Factor only at high frequencies (around 100 MHz), and the Q-Factor for frequencies below 1MHz is not even plot... |
H: Short circuits and equivalent resistances: why does the subcircuit get cut off?
The circuit is the following:
simulate this circuit – Schematic created using CircuitLab
What is the equivalent resistance seen across Nodes 1 and 2? I am told it is R4 + R5. That means everything to the left is cut out.
1) Why can't c... |
H: Does cooling the NAND chips on an SSD negatively affect its reliability?
The problem of heat dissipation in high-performance, small form-factor SSDs is well-known, for example, the paper Transient Thermal Analysis for M.2 SSD Thermal Throttling published in 2018 17th IEEE Intersociety Conference on Thermal and Ther... |
H: Is HC-05 Bluetooth adapter suitable for logging fast?
Just bought HC-05 bluetooth adapter from Ching and I wonder how fast HC-05 is if I can do logging with it?
Assume that we have a PC and a microcontroller. The PC have a FTDI232 connected to the USB port and the FTDI232 is connected to the HC-05 and I send values... |
H: How this voltage resonant soft-switching IGBT works?
In this voltage resonant soft-switching IGBT:
1) When IGBT turns off, what is the reason why Vce slowly(sinusoidally) increases after current turns off?
Was it because the stored voltage in L1 is slowly discharged so that Vce will not abruptly increase???
2)When... |
H: Why we need start/stop bit for asynchronous transmission
I was reading a book which says
Asynchronous transmission is so named because the timing of a signal is unimportant. Instead, information is received and translated by agreed upon patterns. To alert the receiver to the arrival of a new group, therefore, an ... |
H: Why have the same chip in the same package, but with a different number of pins?
STMicroelectronics offers the following two accelerometer chips.
The LIS2DW in a 14 pin LGA package
The LIS2DW12 in a 12 pin LGA package
These two chips are functionally equivalent and have the same dimensions (2 mm x2 mm x 0.7 mm), ... |
H: Basic Power Consumption - Continually leave AC on vs Occasional start/stop
Question
If my goal is to keep my energy consumption at a minimum should I power my AC off once the room is cool or leave it running in its sort of stand-by state (fan still running)? I'm not sure of the physics of the power consumption but ... |
H: TVS diode for RS485
I'm studying the ISO1500 for an RS485 application. In particular, I'm looking for a TVS diode for bus protection. I've found that a common TVS diode used for RS-485 applications is the SM712 (like Bourns or Littlefuse) because it has asymmetrical reverse stand-off voltages to match the common-mo... |
H: Switch off power when 0v is sensed / Short to ground
I have already posted this question but I made a mess of the diagram so deleted it and am posting again, apologies to anyone to answered the original question.
I'm fairly new to electronics and am stuck at how to get a circuit working. I have 2 peripherals connec... |
H: Calculating magnitude of current provided by a voltage source
simulate this circuit – Schematic created using CircuitLab
A couple of days ago I attended an exam where I was asked to calculate
Voltage at node A;
Voltage at node B;
Current provided by the voltage source.
Using node analysis I managed to find volta... |
H: What does Vaa mean?
I'm trying to understand this circuit. It looks like all the NCP chips are just voltage regulators, but I don't understand the VDD and VAA labeling, what do these mean.
Also, any idea why the top right and top left circuits are exactly the same but lead to different labels?
For reference, this ... |
H: Adding supplemental power to USB device
I have a USB microphone that I'd like to supplement with more power than my laptop USB port can provide. What I did was cut the power lines on the USB cord and fed in an external power source through those lines. I then tested the power line connectivity by plugging in my p... |
H: Off-the-shelf electromagnet with deterministic pole
I looking to buy an electromagnet (12v) and there are a lot of them out there on amazon and ebay in all kinds of size and shapes -some are round, some are rectangle, etc. However, in my application, it's important that I have a positive side of the magnet facing ... |
H: Switching circuit based on clock
I have attached the timing diagram. I want something similar to monostable multivibrator but with so additional features. don't know how the circuit will be.
Case 1:
I want the output to go high at the rising edge of the input, output stays high as long as the input is high but ou... |
H: Question On Logic Gates
In a small railway station, there are three platforms, #1, #2, #3. Up and down trains can enter in platform number #2 and #3, but platform #1 is only devoted to up trains. Design a logic circuit using basic gates for train entry into the station with proper truth table.
I'm not able to compl... |
H: How do I make this electronics system of circuits and batteries work?
I have this:
where Battery #2 will connect with pins (like wireless earbuds) to Battery #1 so Battery #2 can get charged (from Battery #1). So Battery #2 can be easily disconnected and connected to Battery #1 just like wireless earbuds with thei... |
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