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H: Choose MCU with long life cycle
Given specific requirements one usually has a very wide choice of matching microcontrollers. Other than avoiding tags like "not for new designs" and such, is there anything one can do to ensure that the product one chooses is still available several years from now? Are there some man... |
H: Multi-source in Unit <> on signal <>; this signal is connected to multiple drivers
I'm trying to design a multiprocessor in Verilog.
`timescale 1ns / 1ps
module Microprocessor(
input [7:0] instruction,
input clock,
input reset,
output [7:0] nextAddr,
output [6:0] seg1,
output [6:0] seg2
... |
H: gain of inverting op amp with resistor on input
I´m trying to figure out the transfer function of the attached op amp circuit. I came to the conclusion that v_out = - v_in as as the two resistors in the upper path are equally sized, and the non inverting input is on ground potential.
However this is a task from one... |
H: Voltage between phases of 220V 3-Phase Generator with no neutral
I'm looking at a 220V-50Hz 3phase generator which has no neutral wire and 3 live wires.
Am I correct in assuming that the voltage between phases will be 220V for this generator?
AI: Am I correct in assuming that the voltage between phases will be 220 ... |
H: How do multimeters measure capacitance of polarized capacitors?
On my multimeter it doesnt matter in which polarity I put polarized capacitor.
How is it made?
If it is just simple rc circuit that measures charging time, how does it not damage capacitor in reverse voltage?
AI: Below a certain voltage (typically half... |
H: How does this TLC556 work?
I'm having trouble understanding what the upper part of an electronic metronome depicted in the below schematic does.
I already asked about the lower op-amp part in another topic, but I also can't figure out how the upper part works.
This is my understanding of what the upper part does:
T... |
H: Why are DIMMs not equipped with a heat sink like a CPU?
I know that a DIMM is composed of a set of chips that contain control logic managing the decode and prefetching memory operations. According to a product specification, I found that newer RAM works at a high clock rate (> 1Ghz) that is comparable to some CPUs.... |
H: Charging a single 12V battery from 2 solar panels
I'm building a solar powered robot that uses a 12V lithium battery. It will have two (17.6V max) solar panels - one on the top and one on the bottom (so it will still work if it flips), meaning I won't be able to wire the two panels directly together (as the one on ... |
H: Resistor for solid state relay (CPC1008N)
I have solid state relay (CPC1008N) Dataheet here. What is the resistor I need to use to connect it to a power supply with an output voltage of 4.5 volts?
AI: Assuming your control voltage is also 4.5V:
You need at least 2mA to guarantee activation of the relay.
The diode... |
H: How does electrical power relate to Ohm's law?
I have some difficulty grasping these concepts. Let's say, for example, a power source of 10W operating at 5V is connected to a load of 0.5 ohms. According to Ohm's law, it is expected that a current of 10A should flow through the circuit. However as given above, the p... |
H: Formulas for Carry out in a Full Adder
Given a full adder with inputs $$A, B \text{ and } C_{in}$$
The formulas for the outputs are $$S = A \oplus B \oplus C_{in} \text{ , Where } \oplus \text{means XOR}$$ and $$C_{out} = AB + AC_{in} + BC_{in}$$
But when a Full Adder is created by combining two half-adders, the o... |
H: What is the "minimum" transmit power for uplink cellular transmission
Can anyone help me in finding a good reference for minimum transmits power for uplink cellular transmission?
is 0 dBm a good enough power for very low-power transmission in an indoor environment? Will it achieve high enough RSRP values at the rec... |
H: MCU 3.3v to 5v Relay Driver, MOSFET or BJT
I couldn't find a definitive answer.
What's more suitable to drive a 5v relay from a 3.3v MCU, a MOSFET or a BJT Transistor? NPN or PNP?
I will be using a Schottky SS34 as flyback diode. Relay consumes 75mA.
I can use NPN transistor MMBT3904LT1G or N-Channel MOSFET BSS13... |
H: How to get 8MHz square signal out a pic18f45
I am using a Pic18F45K40 to control an ST7590 power line networking
chip which requires an 8MHz clock signal to function. I read the datasheet and it looks like a 16MHz signal can be generated from the 64MHz microchip.
I set up the Reference Clock Output Module as follow... |
H: PSoC-59 pins span
I'm wondering what is the dimension between rows of pins of CYPRESS CY8CKIT-059 (marked at the picture in red).
I searched through many manuals and specifications, but I havent found this information. Do You know where I can check this dimension?
AI: You can load your image into a program such as ... |
H: Reasons behind placing power supply parallel capacitors in the correct order
I don't know if this was asked but I couldn't find a satisfactory answer in some related questions.
Imagine an IC or a sensor will be powered and some caps are needed to be installed in the vicinity. I know that the caps must be as close a... |
H: Understanding Working of High-Pass RC Filter
I was trying to visualize what happens when frequency is swept from 1Hz to 1GHz. In case of capacitor, voltage lags behind current by 90 degree and capacitor reactance depends upon it's frequency.
I have tried simulating the RC filter using LTSpice. The picture is given... |
H: Block diagrams can be different and still works for the same system?
I am an telecommunications engineer who is working now as a programmer. At university we took a class on digital filters, Laplace transformation and working in the frequency and time domain. At the time, no one told us what is the practicals that ... |
H: Transfer Function: Trying to understand the Laplace analysis of this circuit
I am trying to do the transfer function of this circuit and also trying to understand the frequency domain thing of the Laplace transform.
I want to do a transfer function of VA/V1, considering B to be ground.
After doing the node analysi... |
H: Lithium-Ion - leave at full or charge and discharge
I am getting a laptop soon, and am wondering if I should leave the Li-ion battery at full during use, or have it charge and discharge within a range of, say, 40-80%. The goal here is maximum battery in-service life.
AI: Depends on the current draw of the laptop. S... |
H: TL072 supply voltage +-4.5 V vs. +-9 V
I have preamp circuit from an earlier project that is based on TL072 opamps. I have been using it with a 9 V (+-4.5 V) power supply, but now I have the chance to give it a +-9 V supply. The signal that goes through it is a small audio signal, probably never larger than 1 V. Do... |
H: minimum readable rise/fall times in an oscilloscope
How can I calculate minimum readable rise/fall times of a signal in an oscilloscope (from practical point of view)? Does it depend just to bandwidth and sampling rate of oscilloscope? regards
AI: Did you Google at all before asking? A simple search for "scope band... |
H: How to supply enough power for a DC motor
I'm fairly new to electronics and have been reading extensively into it, but I'm unable to map all the concepts together.
My project is a tiny drone involving (four) 4 N40 DC motors, rated 26k RPM at 3V 0.3A, and 42k RPM at 6v 1.68A.
From my understanding, to power the moto... |
H: High current melting a spanner - what's happening?
Just a couple of guys doing fun things with a DIY low voltage very high current transformer. One of the things is putting a spanner on a brick and touching the two ends with an extremely thick copper cable carrying several thousand amps.
The spanner then becomes re... |
H: Why does inverter synchronization with the grid take 5 minutes?
We had some solar panels & an inverter installed recently. Every time the inverter is turned on (after maintenance or with the first light of the day) it has to synchronize its generation phase with the grid, and it is easy to understand.
But why does ... |
H: USB Bus Powered with LDO device example
I'm planning to use the FT232R in my USB device. The device consists of the FT232R and a dsPIC33EP64MC202 (Basically speaking, the FT232 and a microcontroller only).
On the FT232R's datasheet, at the end of page 26, section 6.4, it talks about another possible configuration, ... |
H: Negative input, negative output switching regulator?
I've got a component within a larger device that requires both +15 and -15V, drawing about 100mA per rail.
In addition, the main power supply of the larger device is providing +/- 28V, with a common ground.
My initial thought was to use good old linear regulators... |
H: Can a sealed lead acid battery charger work properly with a flooded / wet cell deep cycle battery
I know that charging sealed / AGM / gel cell lead acid batteries requires a special charger so they don’t get overcharged, overheated, boiled out, and destroyed.
Is it safe to use this special type of charger with a s... |
H: how long should an I2C slave wait for a STOP bit (if at all)?
I2C frames each group of message bytes in START and STOP conditions, defined as SDA changing state 1>0 or 0>1 (respectively) while SCL is high, as described here.
I am writing interrupt driven handlers for PIC32MX170, and I got quite far using the STOP b... |
H: How to read flag register in datasheet?
I'm having troubles deciphering the datasheet for the DS3231 RTC. The below table shows that 0x02 bit 6 is the flag to operate in 12- or 24-hour mode. But which one correspond to the bit being low or high? I assume the line above the 24 must tell it, but I guess I lack knowle... |
H: Right way to connect leds to light up when pressing buttons
I want to connect leds to Cherry MX switches (push switches) so they light up when I press them.
I have 6 switches each connected to a different pin of a teensy 2, basically like this:
The diodes are 1N4148.
What is the correct way to connect the leds ... |
H: Simple Stepper motor for my experiment?
To graduate (Grade 12 or Year 12), I need to do an self-thought experiment in Physics. I decided to do something about stepper motor because I learned that they use this type of motor for robot arms.
Of course, I know that I cannot build a real entire stepper motor. However,... |
H: Calculating life of portable power supply for icybreeze cooler
I recently purchased an IcyBreeze Portable Air Conditioner and Cooler for an upcoming camping trip. I want to run it on low for two nights, or about 16 hours. With this in mind, I purchased the following portable power source
The capacity is advertised ... |
H: Is a PCB a requirement for an RFM95 family for HopeRF LoRa modules?
I watched a few videos and read a couple of blogs regarding the HopeRF RFM95W family of transceivers.
All of the videos recommend using a breakout PCB similar to this one or this other one, or this one
One of the videos states that the distance bet... |
H: Is D flip flop equivalent to frequency mixer (difference frequency) for square waves?
I was trying to make a frequency mixer (only difference frequency) for two square waves (PWM1, PWM2, both 0.5-4KHz range) using ONLY Arduino due.
I'm new to signal processing, and the only way I can think of making a differential ... |
H: EMC test for PCB board without housing
Our company is exporting our product to European market. To sell it to Europe we need CE mark. so we let the test lab test only EMC(EMI+EMS) because our products usually don't equip any RF nor AC power.
Now, we are developing a board type product without housing. The board typ... |
H: Are anti-static bags needed for storing electronic components?
Should I keep the sensors in the anti-static bags or are the bags only needed when shipping?
As the anti-static bags are inconvenient and often too big to put the sensor into a compartment in my electronics box.
AI: The answer is "depends". Devices tha... |
H: How does capacitive coupling work for measurements
The context is the measurement of engine speed on a vintage car that uses a classic Kettering ignition system. Essentially, a voltage pulse of tenths of kV is generated on a high tension (HT) lead. The frequency of the pulses can be used to calculate engine speed.
... |
H: Build a simple coil generator
I know that if I want to create a powerful electromagnet, then I'd better put a ferromagnetic material inside the coil I build. So I was wondering if the same applies in the inverse scenario, that is for a generator (I simply mean a coil where I induce electric current by moving a mag... |
H: sizing voltage regulator
I am to size a 3v3 voltage regulator,
It gets at its input 12VDC maximum. And the load can consume up to 150 mA (few leds, 20 NMOS control, ADC control, microntroler supply...) and ambient temperature can reach 70°C.
I have to be surface and cost efficient in my choice.
I'm struggling with ... |
H: Why did my micro-controller short out even though the alligator clip of the oscilloscope was connected to a ground pin?
I have a STM32F407G-Discovery board, and I bought a DS1054Z oscilloscope for the purposes of debugging.
Before I did anything, I went through videos and articles about how to use it. From my ver... |
H: What part of a mobile phone charger makes it safe to be charged with opposites polarity?
A mobile phone charger works regardless of whether the charger is the right side up or upside down. As I know, batteries should not be charged with wrong polarity. How do those chargers accomplish that?
AI: The input power supp... |
H: Input resistance of small signal equivalent
I'm trying to calculate the input resistance of the depicted small signal equivalent circuit.
I was just wondering why I can't see the current source as an interrupt and then the input resistance will be: r_pi+R.
I recall that replacing current sources with interrupts and... |
H: What would be a good replacement for a set of HR6 batteries?
I need to change this OEM set of batteries1 because they are not holding a charge any longer. I am not familiar with rechargeable batteries.
My understanding is that I should be able to swap the OEM batteries with two 1.2V 1300mAh AA batteries2.
Would it ... |
H: In a 3 phase rectifier, why is the output always the highest voltage?
Consider following circuit
At t=0 I can wrap my mind around the fact that Vout equals whatever value the highest phase has since the others are negative or zero. But after that only one of the three phases has a zero voltage value. Blue is risin... |
H: If I have two 18650 Li-ion batteries with different capacities, can I charge them using the same circuit?
I have several 18650 Li-Ion batteries, many with different capacities. Can I charge them with the same charging circuit (5 to 3.7 V 1 A buck converter)? Can I put them in parallel and use the same step up circu... |
H: Can we use nodal analysis without any information about the current
I learned today Mesh Analysis and Nodal Analysis principe (with KVL and KCL) for a computer project and I am not certain about one thing.
Can we use nodal analysis with only the voltage of the source and resistances of components in the circuit to ... |
H: register enable line usage in `case` block (verilog synthesis for altera cpld)
I have the following in a verilog design aimed at an altera CPLD (currently targeting EPM240, although the target device isn't set in stone):
always @(posedge clk)
if (we)
begin
case (rw_sel)
3'd0: reg0 <= data... |
H: Classic transistor differential amplifier - problem with a single-ended output
I have a differential amplifier like at the pic below:
And I am not sure if I am doing everything right.
We know that the input signal is a triangle wave with \$ V_{pp}>100\text{mV}\$, no offset and \$f=1\text{kHz}\$ and our output signa... |
H: Step motor movement
I have found code for running a step motor ( https://os.mbed.com/users/XtaticO/code/sMotor/file/4b3b9e047ce3/sMotor.cpp/ ), however I am not sure if it is correct:
void sMotor:anticlockwise() { //rotate the motor 1 step anticlockwise
for(int i = 0; i < 8; i++) {
switch (i) { // activ... |
H: SDHC write partial block
Is possible with SDHC microSD card write 32 bytes of data without loading full block o the RAM? SDHC has for some operations fixed block size to 512 so I dont know if it is possible. If possible what commands I have to use? If it is not possible is another way to write data to SD card from... |
H: Best microphone picking up sound within a small room?
I've tried several Electret Condenser Microphones as input to a generic USB audio sound card:
MO064202-4
MO064402-4
MO064402-5
All mics work great at close range (about 1 or 2 inches). However, none of them would pick up any sound at ranges further than that.
I ... |
H: Calculation of 3-phase power in Electric Vehicle Charging
I have a doubt regarding calculation of 3-phase power in EV charging. On the last page of the pdf in the link given below, the power calculation is done as 3 x 230V x 16A = 22kW.
http://www3.fronius.com/cps/rde/xbcr/SID-673FE905-375C8296/fronius_australia/W... |
H: Solving the differential equation in control system engineering
While I am continuing my studies of the Norman S. Nise book about Control System Engineering, and while trying to solve exercises of chapter 1, I noticed that I am out of the scope of solving differential equation. I forgot how to solve a differential ... |
H: Can I guess the Rds(on) at 3.3 V from this MOSFET datasheet?
I ordered some MOSFET switch modules. Because they were advertised as "for Arduino" and "Voltage: 3.3V, 5V", I assumed they had chosen a decent MOSFET for the job (like the IRLU7843 or at least the IRLZ34N). There is no additional circuitry on the modules... |
H: Which kind of logic latch for an over-current H-Bridge disable?
I have a simple logic circuit requirement, but can't seem to match any standard flip-flop or latch to my needs (SR, JK, D, MS, level-sensitive or clocked, etc).
The circuit is to disable a H-bridge driver IC if an over-current situation is detected (vi... |
H: Is it OK to put traces under castellated PCB
If we would speak in general: what is the strength of the solder mask in terms of breaking voltage?
So if we put one PCB with castellated pads on another board like this:
What will heppen if both PCBs would have traces one on another (meaning bottom layer of the top PCB... |
H: How can I assign a 256-bit std_logic_vector input
I realized an AES-256 algorithm which encrypts a 128-bit std_logic_vector (plain_text) with a 256-bit std_logic_vector (master_key). I made a test-bench in order to verify the behavior of the encryption process, and now I would like to implement this algorithm on my... |
H: Is there any other similar file format like BLIF?
I bump into Cingulata project which uses Berkeley Logic Interchange Format (BLIF) to represent circuit. I find BLIF file format is a very human-friendly text file format and easy to understand, and am curious to know whether there are other similar text file formats... |
H: The materials used in an electrical grid going from power station to house
In getting an overview about how Electrical Grids work, I was hoping to connect the dots from voltage up to the materials (used in modern electrical grids).
I am wondering if one could outline briefly the high-level materials / components us... |
H: A question about circuit design with a multivibrator
I want to implement a pulse extender with a retriggerable multivibrator IC called CD74HC123EE4. Here is the datasheet.
The input will be a 32Hz pulse train with a 5 µsec duty cycle; and at the output the duty cycle will be stretched up to 1.5ms. It is okay to kee... |
H: RF design stitching vias
Having no past experience on RF design I have recently been taught that placing stitching vias is a good practice. Reading the "definition" of stitching vias I am not sure that I can distinguish stitching vias from common vias. The definition I have read is from Altium:
Via stitching is a... |
H: Two phase latch max delay constraint
In this timing diagram, why am I not including tcpq, i.e. the latch clock to Q propagation delay?
AI: This example uses transparent latches instead of edge-triggered flip-flops, and notice that the data inputs (D1, D2, D3) are changing while the latch enable signals (\$\phi1\$... |
H: Voltage regulator frequency range
I'm designing a new encoder pulses counter for my project, my encoder HE50B uses a 12-24 VDC Input, and it has 1,000 pulses per each revolution. also the maximum permissible speed is 5,000 RPM.
Now I want to count the output pulses of this encoder by my micro-controller ATMEGA-32 w... |
H: What is the difference between the circuits?
I found the trigger (latch) circuit:
When no button is pressed, the LED does not light, if you press SW1, the LED will light up, and will light until you press SW2.
This can work for different values of the resistors (R2, R3, R7, R8).
What will be the difference, if we p... |
H: Index of frequency larger than power spectrum length
I am new in this community. So excuse me if it seems easy.
I want to calculate the amplitude of a specific frequency in a signal.
The frequency precision is (relevant question)
$$
df = \frac{fs}{NP}
$$
$$ fs=1/dt$$
NP is the number of points in the signal time ... |
H: reason for etching the green mask
I found the following board in random research. Can anyone explain the reason for etching the green mask in red color circled area and that too patterned?
The other side of etch is the processor IC.
AI: As comments have already pointed out, it's being used as a heat sink. The via... |
H: How to understand a battery specification
I read a data sheet of a li-ion battery to use it in my project. In the data sheet, it is mentioned that c5mah= 2200mah. I couldn't understand what that means. Please help me with understanding that.
AI: In the data sheet, it is mentioned that c5mah= 2200mah. I couldn't und... |
H: PCB layer stack up practices
Sorry in advance for the newbie question, but I can't seem to find a good answer. Recently, I've gotten into printed circuit boards and it is all still fairly new. I'm working towards creating a 4 layer pcb and I'm curious common practice for layer stack up. I've seen some places that u... |
H: Need equivalent for diode
I could not find the datasheet of this diode. I need an equivalent, could you help me?
AI: The two triangle symbols strongly suggest that this device contains two diodes with their cathodes connected together. Each outer pin is the anode of one of the diodes, and the center pin is the com... |
H: Inside of 2.4 GHz Dipole Antenna
I bought the following dipole antenna:
Now I want to add some extra simple reflector and directors next to this dipole to construct a Yagi-Uda antenna. For this aim, I need to know where is its feeding point (its center for a dipole antenna ). Eventualy I removed the cover of the a... |
H: What are good resistance values for stepper motors?
I've got some NEMA standard stepper motors, and I've been measuring the resistances of the coils to check if the motors are bad. All 3 yielded the same result, but that doesn't mean they're right.
The results that I got for the 4 connections (ABCD) I got the foll... |
H: 3.7V battery charger analyse
I have extract this schematic from youtube (only charger parts) and create this on falstad because I want to create 3.7V battery charger. The original charger use 1N4007 diode with BC547 transistor. I have only 1N4001 diode and 2N3904 transistor, can I use this in place? Is this circuit... |
H: Protecting microcontroller output
I'm designing a very simple microcontroller breakout board. I wonder how can I protect microcontroller output pins against accidentally connecting another signal to one of them and burning the pin's output driver (because it's an output not input) ? Would a small (say 10 ohm) resis... |
H: PIR sensor outputs HIGH for too many seconds
I've a pretty simple set up which consists of a PIR sensor and ESP8266.
This PIR sensor outputs a HIGH value when presence is detected. This HIGH value lasts for 8 seconds.
I want this trigger to wake up a ESP8266 chip from a deep sleep. To do so, I must send a LOW to th... |
H: How to switch composite video signal inputs to one output
what I want to do
To switch composite video signal inputs to one output.
conditions
4 inputs to 1 output
all inputs and output are composite video signals with RCA connectors
12VDC used for power supply
Arduino used for switching
I've been wondering which ... |
H: How should I protect from overvoltage ADC?
I have a microcontroller with a built in ADC that I am using to read from an input pin (ATMEGA328P to be specific). I want to allow switching of resolutions on the input for our users (0-5V range, and 0-10V range) which i was planning on doing via a voltage divider. The th... |
H: Driving a Common Anode RGB LED Using a uC
I have an RGB LED, APHF1608LSEEQBDZGKC, (Datasheet) which is common anode. The blue and green diodes both have a forward voltage of 2.65V while the red has a forward voltage of 1.8V. I want to minimize component count while driving this LED with the TI CC2640R2F embedded MC... |
H: What does this resistor do in this RTD wheatstone bridge?
The question is in bold at the bottom, the following is background.
I am going to measure air flow with a hot wire anemometer using the FS7 sensor from Innovative Sensor Technology (IST). They provide an application note for the sensor linked below.
https://... |
H: Is this resistor necessary for protection?
I would like to incorporate this circuit in my design so that I could use a low current capacity slide switch to control the 2A current of a Li-poly.
Now, I understand the purpose of having two PMOS for bidirectional current control as discussed here and the purpose of the... |
H: Why don't any countries use 360-volt or higher mains power?
The vast majority of countries use ~240-volt mains electricity, although a few early adopters (such as the United States and Japan) still use ~120-volt mains electricity. 240-volt power has the advantage of having lower resistive losses than 120-volt powe... |
H: Designing High Rate ADC Using Lowers
Is there a way for converting 1 Gbps analog signal to digital, using 250 Mbps sample rated chips?
If you share your ideas, i will be happy.
AI: Since your question is a bit unclear on the specifics (what do you mean by 1 Gbps signal? What do you mean by 250 Mbps ADCs?), I am go... |
H: Several basic questions about alternating voltage / current
I have a few straightforward questions about AC but surprisingly can't find any of explicit confirmations.
I understand that in reality all this is much more complicated but assume example below is greatly simplified case, only steady state with no any tra... |
H: Need help to determine whether PWM frequency is suitable
I am using a solar panel as the power source for making a simple DC motor based fan
Parameters of panel:
Voltage at max power point:8.2V
Nominal output voltage:6V
Max output current :0.62A
Max power=5W
My DC motor is rated at 3V. So i am planning to use a DC-... |
H: What causes loss of power over lifetime of a magnetron?
The power of a magnetron declines over time\$^1\$. While not noticable for most consumer applications (A 2000-hour lifetime would last over 20 years if the device is used only 15 minutes a day), this is a problem in industrial situations.
What causes this los... |
H: Flip a Schmitt-Trigger when current flows through a Zener diode
I am trying to design a circuit using an intermitent power source (a bicycle hub generator), which is rectified and filtered, and regulated at 6,8V.
Now I want to "detect" when the power source is ON or OFF. I made an experimental circuit (below) to va... |
H: General classifications of amplifiers
Some general classifications of amplifiers are wrote down below.
Voltage Amplifier -> Voltage-Controlled-Voltage Source -> Device: OP AMP
Current Amplifier -> Current-Controlled-Current-Source -> Device: FET
Trans-conductance Amplifier -> Voltage-Controlled-Current-Source -> D... |
H: Limit MPPT solar charger output voltage
I have a problem with my mppt solar voltage regulator. I have a campervan with three 320 W solar panels (Voc 40.8 V, Vmpp 33.3 V) connected in series on the roof, and two 260 Ah, 12 V AGM batteries connected in series to get a 24 V system. I've set the correct absorption (28.... |
H: Capacitor dielectric: Is X7R a direct upgrade over 2C1?
I'm trying to replace a capacitor with an IECQ-CECC 2C1 Dielectric. The supplier has offered a comparable EIA X7R Dielectric. Viewing this comparison document, they are largely identical. However, the X7R is not given a "Rated DC voltage applied" value.
Is th... |
H: Why is the input voltage of transistors in the CMOS circuit set to Vdd when calculating the equivalent resistance?
When deriving the equivalent resistance formula of NMOS inverter the graph which is used in derivation is as shown:
$$R_{eq} = \frac{1}{-V_{dd}/2} \int_{V_{dd}}^{V_{dd}/2} \frac{V}{I_{Dsat}(1+\lambd... |
H: How to minimize DC brushed motor arcing noise propagation from MOSFET drain to gate?
I designed a basic on/off control circuit using 555 timer for a 3v hobby dc motor as shown in below.
Without the motor connected, the output off the 555 timer is as shown below. (the mosfet drain is similar just inverted)
But whe... |
H: H Bridge motor control clarification
I am trying to drive a 12V motor that has max amps of 15amps. I am using MOSFET RFP30N06LE. Can someone explain to me why these are used for motor control when they control the current? When I use my circuit below, turning the gates on using TTL 5v from an Arduino my voltage ... |
H: Pulling voltage on a "pull-up" input down to match voltage of voltage output from another device
I have a large lithium (LiFePO4) battery pack composed of 16 cells in series. It is monitored by a BMS (Battery Management System) which is interfaced to a battery charger (Victron Quattro).
The BMS and Battery Charger ... |
H: Can I estimate what CPLD I need?
I'm planning to design a driver for VGA connectors, and for testing purposes I have an evaluation board of one CPLD. Concretely, the board is the Digilent's CoolRunner-II with the Xilinx's XC2C256 CPLD. But my intention is to implement the driver on a custom PCB with a smaller chip,... |
H: How to draw microstrip line in EAGLE?
I am trying to connect W3113 antenna to my RFID UHF reader. The datasheet of the reader requires me to use 50 ohm microstrip line. However, I do not find where I can draw microstrip. Is it still the regular routing? If not, how do I draw the microstrip line in EAGLE? Thanks!
AI... |
H: Driving a boot selection pin with a GPIO pin
I am trying to make a very small change to a circuit to allow for boot mode selection using two boot pins. The component I am trying to control is the STM32F411. One of the pins can be floating in regular boot mode, and driven to ground in the other, therefore I am plann... |
H: Why the rotor core losses are very tiny compared to the stator core losses in an induction motor?
Book says rotor mostly runs at speed near to synchronous due to which the relative velocity between rotor and stator magnetic field is very less. Correspondingly making rotor core losses tiny and stator big. I also kno... |
H: Pre-Amplifier Question
back at it again with a problem that I am stuck on and need some clear explanation of.
1/2: I was wondering How those Bass controls work, for example the ones in the car you allow to change the bass from -10 to 0 to 10 and the bass would increase to barely hearing the drums. Is this due to a... |
H: 12 Volt vs a 24 Volt Motor
I have read that using a higher voltage motor would need less current to get the same power. I understand that P = IV and how that works. My question is if the 24 V motor would get half of the current, wouldn't it have half of the torque as well since they are directly proportional? In th... |
H: Prevent excess current through Zener regulator when system load is switched off
I use a hub-generator powered LED lighting system in my bicycle, made by myself using rectifier, capacitor, and Zener. It's working very well for many years, the Zener does not get hot, and the high-speed voltage is very stable:
simula... |
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