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H: Solar panel MPPT and battery charging
I'm trying to understand solar panel Maximum Power Point Tracking theory and how it is done practically for charging battery banks.
I think I understand MPPT in a general sense: the solar panel has VI curves which define a specific load in which you will extract the most power.... |
H: Solving Currents in BiCMOS Darlington Pair
Using KVL and assuming that the BJT is in forward-active and that the MOSFET is under saturation and using the given, I was able to generate three equations with three unknowns:
1) \$\frac{3V-2V}{1000Ω}=I_D+I_C\$
2) \$I_D=(10^{-3}\frac{A}{V^2})(V_{BE}-0.6V)^2\$
3) \$I_C=(... |
H: Finding times in first cycle with given voltage
I have the question "The instantaneous value of voltage in an a.c. Circuit at any time t seconds is given by:
$$V = 100\sin(50\pi{}t - 0.523)\ \rm{V}$$
Find:
The times in the first cycle when the voltage is -40V."
Here is my attempt:
My final answer is t = 5.949 ms h... |
H: Square AC adapter wire connector
I've never seen this type before and don't know what type of connector I need to add to the wires to connect to it. I've looked on Google and haven't seen it. What type of connector is this (the green thing in the photo)? How do I add the appropriate connectors to the wire so they c... |
H: 9v to 12v using buck booster
I'm a computer science student with very very less electrical knowledge, I need to boost 12v with 1-2A from a 9v box type battery, on searching I found XL6009 buck booster can step up voltage, can I get enough Amps on using it?
AI: I need to boost 12v with 1-2A from a 9v box type batter... |
H: Why is the efficiency of this LED driver circuit so low?
I created an LED driver board based on PAM2863ECR http://www.diodes.com/_files/datasheets/PAM2863.pdf
The board includes three identical driver circuits to drive three LEDs. I'm not able to wire the three LEDs in series in this application. There is also a ... |
H: Accidentally punctured a small li-ion battery, any medical harm from the smell?
I accidentally made a small puncture in an old li-ion battery while replacing it in my phone (it's stuck on pretty tightly with adhesive). A couple of sparks, but no flames. It has been safely disposed of.
The damaged battery emitted ... |
H: Parallel circuit-find value of resistor
I have a parallel circuit with 7.5 ohms as total resistance,75 volts, with 2 resistors. R1=10ohms,R2 is unknown. How can I find the value of R2?
AI: Since \$R_{tot}=\frac{R_1\cdot R_2}{R_1+R_2}\$ it follows from simple algebra that \$R_2=\frac{R_1\cdot R_{tot}}{R_1- R_{tot}}\... |
H: Strange circuit at power input
I came upon this circuit at the power supply input:
The power is usually supplied by the VBUS pin. Now, how dows the circuit work? What is its purpose? I think it is a sort of ideal diode, but can you explain the theory behind?
Also what happens if I apply the power (5V) directly on ... |
H: AC Circuit Having Only Capacitor
In my book, it is written that at any instant,
PD across the Capacitor Plates = Applied EMF ---------(1)
Assuming that it's a pure Capacitor of Capacitance C, I think if Voltage across Capacitor becomes equal to the Applied EMF then, it means that the capacitor is fully charged and... |
H: In ADS, how can I change the electrical length on a transmission line to depend on the frequency sweep?
I'm setting up an S-Parameter test on a transmission line, but I want the electrical length to change and depend on the frequency. How can I go about that? The variables that I can put in are all constant-I can't... |
H: Do conductors in the reactive near field of an antenna cause loss?
I was reading about the reactive near field of an antenna here part of the relevant portion of which is quoted below:
"Because of this energy storage and return effect, if either of the inductive or electrostatic effects in the reactive near field ... |
H: How to calculate the required torque or HP of single phase induction motor to carry a massive object?
I need to know the power of a motor in Hp required to move a vehicle of about 300 Kg. The vehicle is equipped with gear assembly and required to run at 20 to 25 Km/h. The electric motor that is i used in vehicle is... |
H: LM5134.MOSFET driver Spice model not working in LTspice
I downloaded the Spice model of the LM5134 MOSFET driver from the download page, created a symbol and created a schematic to test the model. You can download the zip archive containing the schematic, model and symbol here.
In the following I attached a screens... |
H: Distribution of Current in Kirchoff's Junction Law
I know that Kirchoff's law says that the incoming current is equal to outgoing current.
But I want to understand his: suppose we have 4 wires like the one in diagram.
So let us consider current i1, comes to the junction and gets split into three direction towards ... |
H: Why are OR gates using transistors different from OR gates using diodes?
There are two ways to make an OR gate:
and:
But with diodes it looks easier to make than with transistors, isn't it? What are the advantages of the transistors version and drawbacks of the diodes version?
AI: "There are two ways to make an O... |
H: Impedance of BNC vs output impedance of function generator
I'm a bit confused on output impedance of function generator and coaxial cable impedance.
Consider a function generator with output impedance of \$50 \Omega\$. Suppose that I connect to it a BNC \$50 \Omega\$ coaxial cable and then i connect it to my circu... |
H: Is it bad to let an oscilloscope trace go off screen?
Lets suppose we are talking about a reasonable modern scope such as a Rigol DS1054Z.
I want too look at the ripple at the top of a 5v square wave. I'll change the volts/division and offset so that the top of the square wave is centered on screen. In this scenar... |
H: Matching JFETs for differential amplifier application
How to choose a properly matched pair of JFETs for differential amplifier? Is it enough to measure their Idss?
AI: To be on the safest side both \$I_\text{DSS}\$ and \$V_\text{P}\$ should be checked and matched, it is well known that those two JFET's main parame... |
H: What are Hall sensors used for in a brushless DC motor?
I'm trying to buy a brushless DC motor for a hobby project, and I found a nice one, which lists the information table I pasted at the bottom of this message.
As you can see at the top of the table you can choose between one with, and one without a Hall sensor.... |
H: Flow of preemptive multitasking execution of program
I am reading this article about preemptive multitasking and I didn't understand few things in the article:
The explanation says
Figure 1 shows the execution timeline for two tasks and an ISR. First, the ISR preempts the lower-priority task. But that ISR's execut... |
H: High-side driver IC use of diode in the npn transistor BE
I would like to know why is used a diode between the BE of the npn in this circuit. The npn is used to boost the current to deliver to M2 gate in this bootstrap circuit.
Is it maybe needed to get rid of the accumulated charge during ON operation of the npn i... |
H: Do Step-Down Transformers Increase Total Power Consumption?
Firstly I am not at all experienced in electrical matters so forgive any wrong terminology.
Here's the situation:
I recently moved out of US to a country that uses 220v. We have a single phase step-down transformer that provides 120v to the entire house. T... |
H: ATmega328P firmware flashing interrupted - is it fixable?
I am working on some PCB with an ATmega328P on it. I use a Pogo connector because we have to program and test the PCB outside.
I program with usbTiny, (mosi/miso/rest/clk/power)
Anyway, many times during programming I move a little bit which disturbs the Pog... |
H: What is a reference frequency for electrical length?
There is an option for the transmission lines in ADS which says "Reference Frequency for Electrical Length"
What is that supposed to be? In the transmission line equations, I don't know of any reference frequency. Is it \$\beta\$ or is it \$l\$?
AI: The electrica... |
H: Benefits of using an External A/D converter with ATmega128
I am new to electronics and working on my first project. Can someone explain why you would use an external A/D converter instead of the on board one?
According to Mplabs the ATmega128 has a 8-channel 10-bit A/D converter? is it just less accurate?
AI: It ... |
H: In ADS, what are the differences between the lumped components and the lumped component models?
I'm trying to put in some ideal inductors and capacitors into my schematic, but there are two options: "Inductor" and "Inductor Model".
What are the differences between the two?
AI: A model is not a circuit element. It d... |
H: Applied Power on TVS Diode
I need to calculate the Applied power on a TVS Diode, what I know is P=U*I, I am applying 5v voltage on the TVS Diode but I am wondering what should be the Current value? Should I use the Leakage current as it is reverse Biased? also can this be applied on any type of reverse biased diode... |
H: Hold Time Violations with Shift Registers/Ring Counters
I have read (and been told) numerous times that for a shift register, the clock should run reversely to the data (e.g. http://www.edaboard.com/thread103493.html).
Main Question: Is this definitely also true for Ring Counters (or LSFRs)?
I am building a block l... |
H: PIC18 Assembly Handling 16 bits
I've got a colour sensor that is semi-functional at the moment. I am fairly new to Assembly, PIC especially, and I am confused as to how to handle a "high" and "low" address for a number. Let me explain.
When I read from my colour sensor, I have to read from a high and low address. ... |
H: Interfacing Switch Input with Seven Segment Display using ARM 7
I am trying to detect a switch input so that, if the switch is pressed, a number is incremented on the seven segment display. For example if the seven segment display shows 0, and the switch is pressed, the SSD will now show 1. If pressed again, it wil... |
H: How to control thermal printer from micro-controller and choose it
The project is to print barcode and some text with thermal printer using micro-controller. Initially I chose RP58 which has this command set and serial port.
So to control the printer, do I just have to send bytes according to the command set, on... |
H: Center tap transformer
How can I convert a 113B13 transformer to a center tap transformer? Is like this, for example:
- primary coil: 1 and 2 pins.
- secondary: 3 and 6, where 4 and/or 5 is the center tap?
Will this work?
AI: Connect pins 4 and 5 together, and it becomes the center tap. Between 1 and 2 would then ... |
H: Measuring computer power usage
I am trying to optimize the power usage of a custom application (C#) running on an embedded computer (Intel i7, Windows 7). To do so, I am measuring the current that the system requires while running the application.
This current fluctuates; every second I get a different reading usin... |
H: Is electrical induction achieved more efficiently by coiling a wire than using a cylinder?
I'm currently learning the concept of electrical induction and came up to a realization that if we use a cylinder or a huge strand of wire/conductor instead of coiling tiny wires, we should be able to achieve the same (or pro... |
H: How does "slightly" altering the physical construction of an antenna change its impedance?
Inspired by Phil's comment on this answer...
Bending the dipole to make it more like a V can also serve to get the impedance to 50 ohms.
Likewise, bending the ground plane leads for a 1/4 wave whip alters the the antenna's ... |
H: what is the best way to re-route multiple parts in same package and choose connectors with Diptrace
I am using Diptrace to route a board with over 1200 pins.
It's a fairly dense board with lots of SMD devices and I am using some resistor and capacitor networks, as well as dual MOSFETS and a large cable connector.
I... |
H: Correct Term for "shorting a resistance to start a diesel motor"
I'm currently translating some German technical terms for my English-speaking co-workers. The terms all relate to the Mercedes-made flame-starter for a diesel engine.
I've come across the term "Startanhebung", which (from my understanding), describes ... |
H: What is the best way to generate a negative supply rail using a microcontroller?
I need a ±5V symmetrical voltage to power 5 amps, 4 op amps and 1 in amp (TL081 and INA118). I would like to use only the 5V voltage of the microcontroller (an Arduino this case).
Is it possible to use the 5V Arduino output to power t... |
H: What is the highest achievable update rate for a civilian GPS receiver?
I'm interested in knowing the maximum achievable update rate for a civilian GPS receiver. Specifically
Receivers that depend exclusively on GPS satellites (e.g. not including IMU-based movement estimation to interpolate)
The hypothetical limit... |
H: Why is my SN74LS08N overheating?
I have an SN74LS08N, and I am connecting 3V to the VCC and connecting the other end to ground. I'm not using any of the AND gates. I am only powering the IC. It reaches 120°+ in less than 10 seconds. The datasheet says that it requires a minimum of 4.75V, yet with less than that, it... |
H: Help Understanding How Long It Will Take To Heat My Wire
I am trying to find out how many Amperes I will need to reach a certain temperature in a certain time (Milliseconds)
I need a thick wire to slow the melting of the wire. "Nichrome is the wire I'll be using" now in the American Gauge. I want to use 12 as its t... |
H: Voltage across current source in an open circuit
My question is after steady state(ie. when capacitor is fully charged and behaves as an open circuit) is achieved what would be the potential difference across the dependent current source? How do I find it?
AI: Assuming your v1 is constant and the current source 2v... |
H: Edge-triggered flipflops - keep CP high or low, most of the time?
I'm using 74HCT574 Octal D-type flipflops in a homebrew-cpu project. http://assets.nexperia.com/documents/data-sheet/74HC_HCT574.pdf
These flip-flops latch their input on a +ve edge on CP.
I could either:
keep CP high, then pull it down for the cloc... |
H: What does the 2/0 directionality mean
I am trying to use adum1200 isolator.
I want to know what they mean by 2/0 directionality
AI: The number of channels alone does not completely specifiy how you can use the chip.
The ADUM1200/ADUM1201 web pages show the difference:
ADUM1200: Dual-Channel Digital Isolator (2/0 C... |
H: GL868 Modem Reboot problem
I am working on a IOT based Project which uses GL868 Modem & minimizing power consumption is very important goal for me now. One way of minimizing the power consumption is to turn off GL868 Modem when it is not used. This can be done by issuing following command:
AT#SYSHALT=1
This succes... |
H: A simple bit-math question on register bit manipulation
I read in a tutorial such descriptions:
DDRD |= (1 << DDD0); // sets bit DDD0 to 1 within register DDRD
PORTD |= (1 << PORTD0); // turn on PD0
I can understand step by step the following example:
SREG |= (1 << 7);
Above means take 1 = 00000001
Sh... |
H: From the basic principle to the actual dc generator, where are the 'coil loops'?
I've studied the basic principle of the dc generator which is with the single loop example.
Right here it's the example for the motor but the generator works the other way around. I'm aware of how it works anyway.
My problem is I fail... |
H: How to test the voltage of a speed sensor and identify the +ve, ground and signal wires using a DMM?
I am a novice and would like to identify each of the wires going to a speed sensor.
Below is a photo of the connector from the mainboard (left) to the sensor (right):
Is it possible to identify the signal wire fro... |
H: Need helps on multi range AC voltmeter
I'm planning to make a multi range voltmeter, ranging from 10,50,110,220,330,440,550, and 660. This is my first time making high-voltage things. Here is my current scheme
The input freq is 50hz. I'm using ADUM1401 as isolator.
Here is the question:
I'm pretty sure about the... |
H: RDA5807M FM antenna question
I am trying to use RDA5807M to build a radio. My circuit is basically the same as the reference design in data sheet.
I know the design uses the GND of earphone as antenna. But I don't understand the function of F1, F2, C1 and L1.
I chooses to remove them from my circuit and the circui... |
H: Supply an Arduino via the magnetic energy created by a mains wire?
I'm a software developer trying out some electronics projects so this might be a stupid question but here it goes:
Is it possible to put a coil around the mains wire (220V/50Hz) that would be able to power a small Arduino circuit (5V/15mA) by induct... |
H: How many bits are addressed through one CAS command in DRAM?
From what I understand one column and row pairing corresponds to 64 bits from the DRAM chip, but this makes me think that one would then incur the CAS Latency (~18 clock cycles in DDR4) for EVERY transfer. I feel like this is obviously not the case or els... |
H: Detecting Switch input in ARM 7 and multiplexing two seven segment displays
I am trying to multiplex two seven segment displays, once a switch input is detected.
If a switch is pressed then the seven segment displays should show 1
If pressed again, 2, then 3 and so on.
My problem arises when I reach number 9 sin... |
H: What type of connector is this
I've bought a 12VDC pump for a CNC machine I'm building. I want to get a connector that will fit this plug so that I can run it from my power supply source.
The problem is that I don't know what these connectors are called in order to buy a suitable plug.
Anyone know what this type of... |
H: \$V_{BE}\$ decreasing with \$V_{CE}\$ at constant \$I_B\$ in a BJT common emitter?
I took measurements on a TIP31 common emitter BJT transistor. The circuit was the one in picture
I observed a fact which seems quite unusual.
Keeping \$I_B\$ constant, for different values of \$V_{CE}\$ I measured the correspondin... |
H: Arc Lighter Circuit Design
I'm trying to understand why this arc lighter circuit is designed this way.
This is my understanding of this circuit: the PWM signal is 50% duty at around 18kHz. That generates a square wave at the primary of the transformer, which is stepped up into the kV range at the secondary.
Is it ... |
H: Charging and discharging a Leyden Jar?
A Leyden Jar was one of the first capacitors ever. This guy re-builds one.
He connects the outer connector to ground. That, i can understand.
I can also understand tribocharging by rubbing the (insulative) PVC pipe.
But why is he connecting the PVC to ground?!
AI: Smoke-and mi... |
H: Feasibility of a wind-up radio?
I am wondering about the feasibility of a wind-up radio, meaning a tactical radio transceiver with 2-watt and 5-watt settings that would be powered by a rechargeable battery attached to a dynamo so it could be recharged by turning a crank. How much talk time would you get per minute ... |
H: Lipo battery protection circuit. Is this a good approach?
I want to build a circuit for a quadcopter where MOSFETs are connected to the primary and secondary battery. When the voltage falls below certain value in the primary battery the voltage monitor triggers the P channel MOSFET and cut the supply from primary ... |
H: PCB design for current shunt monitor
I was looking at the INA225 datasheet and wondering how to appropriately design the PCB for this device.
My question is rather simple, the shunt resistor will be far away from the microcontroller and there will be switching regulators along the way, and I want to avoid using an... |
H: Paralleling mosfets to handle more current while driving a DC motor?
I would like to drive a 180W, 24VDC motor with a PWM signal using mosfets such as follows:
simulate this circuit – Schematic created using CircuitLab
The motor is inside a control loop with negative feedback which regulates the speed of rotation ... |
H: Producing different types of tones using the 555 timer
I'm learning how to work with the 555 timer (astable mode) and decided to make a simple synth. The sound from a square wave is rather harsh so I'm trying understand how to modify it to make different types of tones. I'm a bit confused on how exactly to do this.... |
H: Arduino + 6V Solenoid Valve
I'm wanting to control a 6V Solenoid valve from an Arduino using only a single power supply. To do this I was planning to use an external 9V power supply.
There are a few issues I am not quite sure how to resolve
1) Providing power to both components via a single power supply. Whilst ... |
H: re-attach battery driven gamepad to PC power supply
There are times at that I get mad about empty AA batteries or accumulators losing their capacity too early. And since the gaming computer is running anyway, I thought about using one of the molex connectors to run a wire out of the computer casing and use it as po... |
H: What is a term for voltage that does not involve the unit?
Basically the title. What is the term that means the same thing as "voltage", but does not invoke a specific unit (in this case, volts)?
AI: "Electrical potential" is the term you're after here (not to be confused with electrical potential energy stored by ... |
H: can I use a Miller Solar engine for RF applications?
I'm thinking of using a Miller Solar Engine to power a Arduino clone with a RF transmitter. i.e., solar panel + super capacitor + low-power Arduino + RF95W.
However, I read that MSE's are ground-switching solar engines, and I'm not sure what that means. Would ... |
H: Why do single op-amp DIP packages have 8 pins, rather than 6?
Single op-amps often come in 8-pin DIP packages, with 5 of those pins being standardized (or maybe it's just de-facto) like in the ones below.
(source: linear.com)
Older op-amps such as the LM741 (first image) have a very bad sense of what is 0 volts,... |
H: SPI (3 wire) implementation using PIC
I am trying to connect my PIC to RTC. The RTC I am using is DS1302 with only one pin for both (Input and Output). I am trying to simulate it using PROTEUS. The problem I am facing is how can I connect PIC two pins i.e. SDO and SDI to one pin (I/O) of RTC?
ScreenShot is here
Ed... |
H: Understanding Circuitry from a Datasheet
I'm having a little difficulty understanding this section of a circuit from the datasheet for an MC33035 BLDC Motor Driver.
Some info:
Pin 7 is enable, send pin high to enable motor
Pin 8 is a 6.25v source
Pin 14 is a fault pin, active low during a fault (at VCC (pin 17) no... |
H: uart TTL problem
My Setup
I have an Arduino Mega connected with my PCB and both boards exchange data using UART TTL @ 57600 baud rate.
Both have their own separate power supplies (5 Volts each; Mega is powered via my laptop USB and the PCB has it's own isolated power supply). I have connected both their grounds alo... |
H: Soldering issue?
I am currently soldering a new Analog Axis for a friend and the tin to help ground the solder to the joint has burned off and now the tin either goes to the tip or the solder itself. I have no idea how to get the tin to "stick" to the board now. Any help would be very appreciated! Thanks
AI: As oth... |
H: If the integrated circuit die is very small what is the role of the extra circuit packaging?
I noticed that the actual integrated circuits of processors, GPUs, ROMs, specific integrated circuits and other ICs are very small but they usually come in a package that is much bigger. What is the purpose of the packaging... |
H: maximun number of inputs on a opamp adder circuit
With 4 timers of a mcu I am generating 4 square signals , each of them have an amplitud of 3.3v and are generated at diferent frequencies (8KHz 9KHz 10KHz and 11KHz), to generate a multitone signal I am adding them with an op amp adder circuit, everything is OK, but... |
H: Minimum battery capacity
I am working on a project that it has to work at 2.5V-0.3mA, 12h a day during almost 2 years.
The probleme is that I don't understand something.
I did some calculation of the minimum capacity of the battery and I ended-up with some weird results.
Imagine we want a 9V battery.
We have 2.5V-... |
H: Examples for AC circuit analysis with AC voltage source in parallel with DC current source?
Where can I find examples of AC analysis of circuits with AC voltage source in parallel with DC current source and resistors? I could only find examples involving capacitors and inductors.
AI: I assume you are looking for "r... |
H: Which load resistor value for amplifier?
I have build this circuit succesfully but I need more volume. This is an audio chip with animal sounds.
I tried to remove the transistor and connect the out pin to a class d amplifier breakout. I get only a very low volume then.
My idea is to amplify the sound first with th... |
H: How electricity consumption works
I am trying to understand how appliances can consume different amounts of electricity at different times. For example my laptop will consume different amounts of electricity depending on how much work it is doing. But how does it actually request more electricity?
AI: simulate this... |
H: Help me understand electrical fields better
I have a hypothetical scenario that would help me better understand (I hope) electrical fields and propagation of electrical fields better.
So let's have a super simple circuit with one voltage source and one resistor:
simulate this circuit – Schematic created using Circ... |
H: Rotate multiple PCB designators in Altium?
I am copying rooms in a PCB from the right side of a board to the left. Rotating everything in the room is easy - select the objects, Edit > Move > Rotate Selection.
But now all of my designators are upside down:
I don't like this. I figured out how to use the Find Simil... |
H: protection circuits
I was wondering if anyone could help explain how these work? I know they are missing information, but I wanted a general idea on how they are meant to function.
Why place two diodes facing each other?
How does the diode protect against reverse polarity?
How does this one work?
I guess I don... |
H: ESR in Electrolytic capacitor vs Voltage rating
I would like to know why in an electrolytic capacitor the ESR decreases as voltage rating increases.
And why the current rating increases as voltage rating increases.
Thank you.
AI: Your assumption that "all" capacitors of same C and case size have lower ESR with high... |
H: Time domain reflectometry (TDR), pulse shape
Considering this coax cable open end reflection. What are the correct explanations for the flatter rise time, the rounding of the first reflection, and the much smaller what I assume to be secondary reflection?
EDIT:
Cable: ~100m 50ohm "m17/028-rg-58"
Scaling is 500ns/... |
H: Use BBB analog inputs with 0..5V or 0..10V
I plan to use the BeagleBone Black analog inputs for sampling of analog data. But there are some major problems for this:
BBB allows a maximum of 1.8 V analog input voltage while I have 5 V or 10 V max
there are two lines AGND and VDD_ADC where I don't know how they are i... |
H: unknown component in mini cooler
I am modifying a mini cooler/heater and there is one component whose role I don't understand. The Peltier cell is attached to a heat sink on one side and is in contact with a metallic block on the other side. On top of this metallic block there is a black plastic cylinder with two i... |
H: Signal Change When Oscilloscope is Added
Thinking this should be obvious, but having trouble identifying a fix: I use multiple channels on an NI PXI DAQ card for RSE voltage measurements. I need to verify the voltage readings returned by the DAQ card with an oscilloscope. Without the DAQ card input running, the Sco... |
H: Modulation signal getting distored when connecting demodulator
Good day Guys,
I have a question regarding output signals of a specific stage getting distorted when connecting the next stage.
In my scenario, I am working on an AM modulator and demodulator of a 10kHz square wave with a carrier frequency of 850Khz, c... |
H: How to prevent MOSFET from operating in high resistance part of linear mode?
I'm using several MOSFETs to control various loads, e.g. pumps, lighting, ventilation etc.
In the implementation, I have several driver circuits on one board (simple emitter follower, which gives good switching speed with a gate voltage of... |
H: PCB Design Power Plane Question
I undesrtand that ground plane should be continuous so return current will follow right path so no delay and additional noise voltage along with the reduction of empedance which is good and necessary thing especially for high speed.(If anything wrong or lack in this part please let m... |
H: How to interpret thermometer sensor reading values?
how to interpret values for this sensor:
The value is 12 bits, so values can be as much as much as 4096. The temperature range is -40 to +125 Celcius. What is the meaning of -9.05 LSB/degreeC?
user manual p33
AI: At 25°C the 12-bit extended register should hold ... |
H: Is it okay to cut a 2 row 8-pin DIP socket for IC to stripboard connections?
I have a fatal short circuit (connecting 0V to 5V) on a very tedious stripboard project because I was given an 8-pin 2-row DIP socket (shown below) that has a short circuit between pins 2 and 3 (the two middle pins on the left-most side) i... |
H: Number of not gates in multiplexer
I'm reading a page on multiplexers that has the following image. I says for constructing one it used 7 not gate. But looking at the image I don't know why three of them are needed. Could't you just cut down on the number of them by making a connection such as what I've done in red... |
H: Elusive SR Latch: 74118/19 – Hex SR Latch with common reset
I am working on a circuit where I need to hold a few signals until my MCU reads them.
Basically the MCU would read these lines at regular intervals (minutes? hours?) and if a line changed state at any stage during this time, it has to be recorded.
I am opt... |
H: Tekpower TP-3003D Switch Between Constant Current and Constant Voltage
I understand that the Tekpower TP-3003D power supply has two modes: constant current and constant voltage. There is no switch or button or anything obvious to select one mode over the other. How is this done?
It appears to be stuck in constant... |
H: Batteries and running time
If I have a system working at 2.5V-0.3mA powered by two CR123 3.7V-2000mAh.Is my system going to last the same time if I put my batteries in parallel or in series?Because if I want it to last 12hrs a day during 2 years, at 3.7V (parallel) I need a 1780mAh battery (I have 2*2000=4000mAh) a... |
H: AC motor 3 wiring how to connect to EU plug
Hello electronics stackexchange,
a friend gifted me an electric motor he didnt need any more. It looks exactly like this ans also has (nearly) the same numbers on it : https://www.aliexpress.com/store/product/390210-001-390209-001-12V-server-fans/1913237_32589390473.html... |
H: In step up transformer which side have high inductance?
I plan to use 1:10 center tap step up transformer, in my circuit design. But I have one question, which side have high inductance in step up transformer? (Primary or secondary) Give me some hint of inductance of transformers.
AI: As the inductance of a winding... |
H: If electrons move slowly in an electrical circuit then what signal or energy is it that travels at the speed of light?
I am reading "Radio Theory Handbook" and am confused with the statement that says that electrons are moving through the wire at snails pace.But it goes on to say the "electrical effect" is instanta... |
H: varistor with reverse operaton
Varistors are known to use for over-voltage protection, as they have high electrical resistance at low voltage which decreases as the voltage is raised.(wikipedia).
But is there any electrical component or simple solution to function reversely?!
In contrast, A non-linear resistor to ... |
H: AM Demodulation of Square wave
Good day Guys,
I am working on an AM Modulator and Demodulator circuit using the diode method. My modulation signal is a 10kHz Square Wave and I have a carrier frequency of 850 kHz. My modulation works just fine, according to my general knowledge, however, my demodulator is currently ... |
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