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H: Wire capacity - Total power or just current?
So I've gotten myself into a healthy, educational Facebook discussion. Link is here if you're a member of that group.
When I thought about it, everyone defines wire capacity by current only. The voltage only comes in when talking about wire insulation.
However, I've alwa... |
H: Transformer secondary C.T. Label
Can anyone tell me what the “C.T.” Stands for in the Secondary Volts column (see pic) stands for? When I see that my mind thinks “current transformer” but this is not a current transformer in the sense that I think of them. I know that current gets “transformed” across any transform... |
H: Boost Converter Design Formulas
I have a boost converter.
Vin=10-16V
Vout =23V
Iload=250mA.
Fsw=125kHz
NCV3063
I have a Boost converter App note from TI. Boost Converter TI App note
I tried to design my boost converter circuit using the formulas provided from the app note as I was not able to understand the form... |
H: Why have both: BJT and FET transistors on IC output?
This is the structure of FAN3100 gate driver IC:
(taken from its datasheet)
As you can see - there are two ouput switches: CMOS and BJT.
Why they put them both?
AI: Paragraph 2 of the description says:
FAN3100 drivers incorporate MillerDriveTM architecture for ... |
H: Digital signal into the video cable
The input signal is simply composite sync signal, without any additional video information. It is CMOS - 0 to 5V levels. I need the same type of signal to appear in the cable along with the RGB lines.
The difficulties I face relate to the best way to tranform the signal - in term... |
H: Inverting high DC voltages
How do I turn a high negative DC voltage into a positive DC voltage around -88v?
I need to do this to be able to measure this across a sense resistor using an LTC2992
AI: I need to do this to be able to measure this across a sense resistor
using an LTC2992
The LTC2992 will handle negat... |
H: Current coupling in self-monitoring laser diodes
I always wondered why the most common pinout for laser diodes with a monitoring photodiode was so strange. It wasn't sure how it was intended to be used until I ran into this circuit here:
https://www.youtube.com/watch?v=MUdro-6u2Zg
In my mind, it seems a bit strang... |
H: How strong a transformer do I need to convert from 220V to 11V at 1.6A?
I have a (cordless drill) battery charger that has these specs on its back:
INPUT: 120VAC ~ 60Hz 26W
OUTPUT: 3.6V - 10.8V DC, 1.5A
Where I live the wall electricity is ~220VAC so I thought a small step down transformer (converter?) from 220V A... |
H: Base Current vs Emitter Base voltage
Why is it universally stated in so many places that the Base Current Ib controls the collector current Ic in a Bipolar Junction Transistor when I guess it is pretty obvious that its the Emitter Base forward bias voltage that will be responsible for the change in the base current... |
H: Normally Closed Optoisolators
I understand that typical optoisolators can logically be considered as "normally open". However I have a situation where I'd like the circuit controlled by the opto to be normally closed, mainly for the failure state but also so that the opto's led doesn't have to be activated for 99% ... |
H: Can one of the capacitors in series get negative Voltage when discharging?
Supppose i have the following circuit. And I complelty discharge all the capacitors by having a load on them for a long time, so there will be 0V overall. Let's assume the one in the middle has a slightly different capacity. My question is w... |
H: Propagation delay and its measurement in datasheet
I am referring to Gate driver LM5102
Here the terms are bit misleading
1] Lower turn off propagation delay
2] Turn on delay
But application curves uses different measurements symbols(tp/tdl)/names,
I am now assuming turn on delay is 50% of VI to 10% output
Pro... |
H: Basic transistor circuit
I'm playing around with a BD179 transistor, trying to get my LED bulb to light up but without luck. My mistake is probably something very simple but I'm learning so bear with me.
AI: There are two potential problems in your circuit.
1. The 2kOhm base resistor is too high.
By applying 3.4V t... |
H: Are all Earth Grounds Equal?
Hypothetical: I have two circuits that are being powered from the same electrical service. They both have a hot and a neutral wire from the same transformer.
The first circuit and the transformer are earth grounded locally with a ground rod.
The second circuit is earth grounded on the ... |
H: How to solve this power relating task
The task says:
Determine Z if power on R (R = 3 Ω) equals 666 W. Apparent power equals S = 3370 VA and power factor is 0.937(capacitive).
This is the picture od circuit:
I tried to solve it like this:
\$ P_R = I^2 * R => I = 14.9 => U_{RL} = U_Z = 99.95 \$
I know that \$ P = ... |
H: Light Sensitivity Indicator (using transistor, LEDs, LDR)
I have;
1) 9 V dc source
2) two LEDs (red and green)
3) LDR
4) few resistors (kilo ohm)
5) npn transistor
I need to build a circuit such that the red LED lights up only at night (0 light intensity) and the green LED lights up only during the day (maximum lig... |
H: Multiplex Analog pin and digital pin on single pin
I have to manage one single analog pin with other digital IO.
I am using a PIC micro, where I have utilized all the pins and I want one more pin for analog input. At the current stage, I can not really afford a new controller design for my project.
I have assigned ... |
H: Basic OpAmp as a Comparator question
I'm continuing my refresher on electronics, and want to validate a conclusion/deduction that I'm reaching. Consider the two comparator circuits below:
In both cases:
I have chosen not to picture decoupling capacitors for simplicity/clarity
The input waveform is a 6 Hz square ... |
H: Old stereo with a blown fuse
I have an elderly but much loved Kenwood cd/radio/tape stack that has blown a fuse. The fuse rating is T800mAL 250volt. For reasons beyond me these don't seem to be available in the UK and the Amazon US supplier does not ship to UK either. Could someone tell me, please, if there is a co... |
H: Can I get 9 V out with a 12 V input from the attached regulator?
The 9V regulator in this datasheet has a 2V dropout voltage. However, in the electrical characteristics on Page 9, the datasheet says that you need 15V input to get a 9V output. Does that mean I can't get 9V out with a 12V input? Or am I interpreting... |
H: Transistor design with beta variation
I am studying Schilling-Belove Electronic Circuits, 3rd Ed. where in its second chapter under the "Maximum Symmetrical Swing" section it gives an example where the base current is kept constant and the beta is varied from 200 to 400 which makes the collector current reach the e... |
H: How to calculate an op-amp's current usage based on datasheet's supply current and its Vout terminal?
This might be a dumb question so if yes, I apologize. I would like to power an op-amp off of a boost converter and I need to know how much current an op-amp would use. I'm using TI's web bench and there's a lot of... |
H: Bi-Directional Logic Level Converter
I want to create a logic converter to communicate an ATtiny85 (trinket 5V) with my raspberry-pi. I am currently following this guide.
I want to use a written program for ATtiny that only generates a TX UART output on the software side and send data to the raspberry.
In this guid... |
H: ESD mats & motherboard safety
Let’s assume
bog standard two layer ESD mat with static dissipative top and
conductive bottom layer, with resistance to ground somewhere between
one mega-ohm to one giga-ohm and with both a mat and an operator
grounded to a common ground point;
bog standard consumer or HEDT motherbo... |
H: RC Snubber For Phase Angle Controller
I have a phase regulator and I'm using it for regulating the RPM of a fan - centrifugal blower. The motor is a shaded pole induction motor (220VAC, 28W).
The regulator is working fine, but if the RC Snubber (R8+C8) is disconnected (due to the failure of C8 or R8), the voltage a... |
H: MEMS piezoelectric sensor circuitry
I have a question what exactly does a MEMS piezoelectric sensor chip contain. Does it contain the sensor element alone (or) also the signal conditioning circuitry for the MEMS piezoelectric sensor as a microelectronic integrated circuit (nanometer/micrometer level).
From what I u... |
H: How can I attach a USB microphone to a Breakout-board using ADC Ports?
I am almost a total noobie to electrical engineering and I bought a programmable Drone called "PlutoX" from here.
I am currently trying to attach a USB microphone like this:
to the so called "X-Breakout board" delivered by the drone manufacture... |
H: How to decipher hex code for time data on an older serial port device
I’m using an old Draeger PAC III sensor to measure gas concentrations, with the goal of remotely transmitting the data via Arduino. Accordingly, I cannot use the proprietary software to output the system information/data. Even though the system h... |
H: If I increase the number of motors in a parallel circuit, will my current increase?
I am new to electronics, and am looking to build my own quadcopter. Before I purchase anything, I want to make sure I can get an appropriate battery to power the motors.
The battery I am looking at is a lithium polymer 3s (11.1V), ... |
H: Sense resistor connection
I'm looking throw bq76940 datasheet and I've found such connection of sense resistor:
What is the purpose of the additional resistors and capacitors? Why all 3 capacitors are required?
AI: It's a lowpass filter. It filter out common mode noise (resistors and those capacitors connected to ... |
H: Level shifting between SD Card and Lipo-powered microcontroller
I have an ATtiny861 microcontroller powered directly from a Lipo battery. My circuit is designed to operate on supply voltages from 3V - 4.2V (bonus if it tolerates up to 4.6V).
I need to interface with a MicroSD card, which works around 3.3V. I'm us... |
H: No. of comparators in Parallel ADC
I can't figure out why exactly the no. of comparators is (2^n)-1 in a parallel type ADC.
The truth table (shown below) for a three bit priority encoder say that there must be at least one HIGH input for the valid output. But as I was reading the Digital Fundamentals by Thomas L. ... |
H: Astable 555 circuit not oscillating
I'm a complete beginner to electronics, but I'm trying to follow Ben Eaters video series "Building an 8-bit computer". I tried to do the first part of an astable 555 timer, but the LED does not oscillate and on top of that the timer draws A LOT of current and heats up pretty fast... |
H: Interpolating output specs on SN74LVC1T45 transceiver
Section 7.5 of the datasheet for the SN74LVC1T45 shows minimum HIGH and maximum LOW voltages for output lines of the chip. Values are given for several different Vcc values (e.g. 2.3V, 3V, 4.5V). What's the most reliable way to interpret values for intermediat... |
H: Current Source and Current Sink
Excuse me for this simple question.
Can someone tell me how this circuit works?
In the video, it is said that, the voltage drop across the resistor connected to NPN/PNP will be only a diode drop. But I'm not grasping that. Can someone simplify it better?
AI: A first approximation fo... |
H: Need help in cable temperature calculations
I am trying to calculate how hot will a 0.6m long 28AWG wire carrying a load of 12VDC, 0.2A get.
I understand that are other factors such as environment cooling rate, thermal resistance between air and the cable etc.
Ampacity values are not really relevant to my scenario... |
H: Flexible GPIO routing Arduino shield
I want to make a combined MIDI In/Out/Thru + MDX Output shield, so I can order/design just one shield for all my needs.
It is intended to use the shield for Arduino Mega which has 4 UARTs, and I want to stack multiple of these on top of each other, and use jumpers to select whic... |
H: Battery type Identification Request
I am trying to replace the battery of a rechargeable LED torch, but it looks different than most others that I have seen. I was wondering if anyone can help me identify it, so I can try to find a replacement. Otherwise I'm thinking I'll replace it with an 18650 and a TP4056 (mini... |
H: Sine to square on complex wave?
What are the required parts on a circuit to get a square wave out of a sine one following the constraint shown in the image?
Schmitt triggers seem to work on continuous sine wave but as you can see, I need to keep the variable volume information as is.
Do you know any part(s) that co... |
H: Current Sensing Amplifier Circuit explained
I've been trying to understand why each every comment is in the circuit shown. I understand that the amp is taking the voltage drop across the Rsense and amplifying it such that the current across it is known. However, I'm not sure why the two resistors are there because ... |
H: Equation of graph from the graph
How would I go about finding the equation of the solid black line exponential/logarithm graph?
The two data points are:
(x,y)
(9,-14)
(20,-21)
AI: For grabbing information from datasheets and producing useful coefficients, I've successfully used WebPlotDigitizer.
Here is a comparis... |
H: ESC Output Current for a Brushless Motor with a Given Max Current Rating
I am trying to power a brushless motor with a max current consumption of 12.5 A (specified in datasheet). How should I figure out the maximum current drawn by one of the phases of the ESC? Should I just divide the max current draw of the motor... |
H: VHDL: case when using constants constructs
I'm having some trouble with the following statement
if spi_ctr = 9 then
case spi_op is
when spi_op = op_get_r_count => spi_reg_out <= ref_count_i;
when spi_op = op_get_s_count => spi_reg_out <= sig_count_i;
when ... |
H: Incorrect gerber rout output in Altium
I tried to get a panelized PCB from Altium using the embedded array option from the PCB Doc file. But, I get a continuous board edge around each of the PCB replicas: it would actually need mouse bites or tab routes or V scores. So, I imported the Gerber and drill files into Ca... |
H: ARM Instruction size vs Instruction encoding
I cannot make sense of the difference between 'Instruction size' and 'Instruction encoding' specially about ARM and Thumb ISA's as explained here:
Can we say that Instruction size is 32 bits but its encoding is 16-bits for Thumb-1 ISA and 32 bits for Thumb-2?
IS 'encodin... |
H: Use half bridge driver with one mosfet
I need a single mosfet driver but only have half bridge drivers (IRF2004) in my parts box.
Is there a risk I destroy them if I only connect one mosfet to them? Any other risks which I should be aware of?
AI: This is done quite often, especially on bigger ICs incorporating seve... |
H: How to read this switch data
I'm come across a schematic that uses a switch symbol shown below. This switch is a Kraus & Naimer CA10 Switch (That's all I know). The schematic symbol is shown on the right with terminals numbered 1-6 and lines representing the three positions. The physical location and angle of these... |
H: Why does capacitance not depend on the material of the plates?
As a student, learning about a capacitor after understanding what a resistor is, it was quite surprising to note that the capacitance does not depend on the nature of the plates used, at least in any type of capacitor I have known.
I am guided, "it mak... |
H: OpenServo and I2C Syncronization
I need to send a command to multiple I2C devices on the same wire. The devices are OpenServos. Each device get's it command and begins processing the information in the command.
How do I ensure that they all start processing the command at the same time?
EDIT: Just to clarify, this ... |
H: Resistive Touch Screens
I was reading this article today about interfacing a microcontroller with a 4-wire resistive touch screen, and found myself a little bit confused.
The article suggested this could be done by using four digital i/o pins and two ADC inputs. Two of the four touch screen interface wires are for ... |
H: What's the next step in my track to become an Embedded Hardware or Hardware Engineer?
I'm a student studying computer engineering , I'm in love with hardware stuff /logic gates design ... etc
What I studied till now is :
Electronics
IC fabrication
Logic circuits design (sequential , ... )
Error detecting & corr... |
H: Controlling Electromagnet Via USB
I need to control an electromagnet via USB with an android phone, to make a small educational project.
I know how to write the software, but how can I control an electromagnet via USB?
Via an USB Relay? Any suggestion?
AI: This may be overkill for what you want, but Microchip do ... |
H: Help with TIP122 darlington transistor
i want to use the TIP122 darlington transistor with my atmega8 to control a 3A 12V geared DC motor. i found that the current gain is 1000 for tip122 from its datasheet. so the base current for 3A output is 3mA(am i wrong?). So i used a 1.6k resistor to limit the current from a... |
H: A little clarification regarding voltages, and "real" current movement
To my understanding, the voltage supplies the potential, and free electrons are taken from ground? This makes somewhat sense to me, for example if something has a "positive" charge then it will attract negative electrons to it - which works out,... |
H: Building a power supply for a Vic 20
I recently acquired an early model Vic 20 computer but don't have a power supply for it and thought I might be able to make one. The Vic 20 is the early model with the two pin AC connector - not the later model DIN plug.
From what I've read it needs 9VAC at about 3A. I'm in Au... |
H: How can I increase the number of hardware UARTs in a design with a single UART MCU?
I am using a TI CC430 MCU because it contains an embedded CC1101 radio frontend. I would really like to stick with this MCU. However, I need to simultaneously interact with a separate serial radio, a FTDI (uart->USB), and an RS232 ... |
H: Theoretical analysis of amplifier circuit
I have the circuit of the amplifier below. I want make the DC analysis and find the gain the amplifier produces and the cutoff freq(high-low).
My problem is that it's been 15 years since I was student and I remember nothing. I will appreciate any help provided.
AI: I did ... |
H: Alternate ways of measuring distance (lateral)?
I'm working on a micromouse, a small autonomous robot that traverses a maze.
I need an efficient way to measure lateral distance to walls and I'm looking at the
Sharp GP2D120
but looking at the datasheet, it has long typical response time of 39ms, is quite bulky, and... |
H: 40 pin ZIF / DIP footprint
I am looking for an eagle footprint that can accept both a standard 40 pin DIP socket or a ZIF socket. Alternatively, if you have tried this and found it to be impractical I'd like to hear that too.
update: thanks for the contributions. I had not realised that different brands of ZIF so... |
H: Determine suitable resistor for the base of transistor as switch (NPN)
I have designed a program to count the frequency and time period of the pulse generated by a 555 timer IC using PC Parallel port. I’ve connected a base of BC547 (NPN) transistor to the output pin (no. 3) with a resistor of multiple values to the... |
H: What happens if I connect a transformer in reverse?
I was thinking the other day. A transformer is just two coils, right? There is no polarisation or anything else fancy? The ratio of the number of windings on the input to the number of windings to the output reflects how many volts are outputted given the input?
S... |
H: Why does my solder occasionally pop?
Sometimes when soldering, it sorta "pops" and leaves tiny droplets of clear, hard substance on my PCB. It seems to be able to melt away with a brush of my iron, and isn't too bad. I'm ironing at about 260 degrees C (510 F) with "44" rosin core .80mm.
AI: As the other answerers h... |
H: How is damage by pulling sideways usually addressed in connectors?
Looks like the primary goal of Magsafe is to prevent damage to the connector (both the mobile part and device-attached part) from pulling the connector sideways. Wikipedia cites a patent issued in 2007.
That puzzles me. Isn't the problem at least se... |
H: Are solenoids/inductors dangerous to have exposed?
An inductor doubtfully will be in a position to be of harm, however a solenoid with 1A+ running through it (and of course a lot of it stored in the magnetic field) can certainly harm the circuit, if not somebody touching it at one point.
From what I would imagine, ... |
H: Safe operating area for different types of battery chemistry?
I'm trying to find the safe operating area for various types of batteries; in particular I need minimum and maximum termination voltages, although information on temperature / power / current is also desirable.
For example, I know Li-Ion typically has a... |
H: Distance range of a Color Sensor?
I would like to know what is the usual range of a color sensor ? Can it detect a light source from a few meters away ?
for example, if I want to use a color sensor to detect a particular LED 1 meter away, would a color sensor detect that ?
I hope someone might know an answer to thi... |
H: Shunt resistance VS Rogowski Coil in current measurement , which one is better?
Shunt resistance VS Rogowski Coil in current measurement , which one is better ?
Just for reference I want to create small circuit that measure the power , so which one I go for ?
UPDATE 1 :
I'm measuring AC current
Isolation is requi... |
H: "Overclocking" an AVR
In AVR datasheets under the Electrical Characteristics section you will typically find a graph like this (this one is from the ATMega328):
I've seen designs that seem to "work" but operate outside the shaded envelope. Specifically, I've seen 3.3V (Arduino) designs that run the clock from an e... |
H: Switch between battery and USB power
Following on an earlier question I am looking for a circuit where it powers from USB when it is available and uses the battery when USB is not plugged in.
I want voltage drop to be minimal, zero if possible. So using oring diodes is not possible. The mosfet power oring ICs menti... |
H: How to use resistors?
I have a power supply of 5 volts @ 1A. I want to reduce the current from 1A to 250mA. Which resistor should be use?
I tried this equation(Ohm's Law):
R = V / I
= 5/(0.75)
= 6.66 Ohms.
I tried the 6.66 Ohm resistor but it only reduce few mili Amps.
AI: The 1A rating on the power supply is si... |
H: How does an audio transformer work with DC in this circuit?
From my knowledge, there needs to be an alternating current for the transformer to be able to create magnetomotive force throughout the core.
Various nerve testers (say for standard school projects) include an audio transformer ran on a 9V DC circuit thoug... |
H: How much longer should we expect DIP (or DIL) Packaging to be around?
More or less in response to this question:
Reliability of anti-static packaging
A few comments were made (which made sense) on manufacturers not really shipping many DIP packages in comparison with SMD devices. So my question is, should we expect... |
H: Prototyping with SMD components?
In response to the answers here: How much longer should we expect DIP (or DIL) Packaging to be around?
If DIPs are phasing out, how would one proto their boards quickly and cheaply? Does this mean we have to all start learning to build surface mount boards? Is there something I'm mi... |
H: Boost Converter for TTL circuits to drive large loads
I've got a small PIC-based TTL circuit device, powered by a 4.5V coin cell, that needs to drive a solenoid which requires 12V. Obviously my logic level device can't directly power that so I could either replace the cell with something stronger, or use a boost co... |
H: A quick way to remember NAND & NOR logic?
I'm frequently asked in class to create a logic circuit based on some specifications. Building the circuit and deriving the equations is the easy part. We are usually told to implement our circuit using only NAND or only NOR gates (akin to a real-life scenario).
I find myse... |
H: Building a "ground plane" for a CB radio
I'm new to CB radio's and finally setup a home one. The kit I bought was cheap and was made for a car. I got all the wiring done correctly and able to get some fuzz back when I turn the unit on and scroll through the channels.
I'm just realizing now that I need a "ground pla... |
H: Creating an IR sensor
Is a PIR sensor as easy as just a receiver? Rather than use some pre-canned device I was planning to just hook up an IR LED to my microcontroller and then read the IR sensor/receiver for a threshold voltage level. My concern is that is a naive assumption as everyone would just do that instead ... |
H: Converting an analog signal of varying maximum and minimum values to a series of pulses
I have a situation where I need to convert an analog waveform into a series of pulses. The generated signal will be coming from an IR LED/photo-transistor pair that will output a signal whose maximum and minimum value will depen... |
H: Getting PWM with an astable multivibrator (square wave generator)
I would like to use this schematic:
to create a square-wave generator but I would like to modify it by getting an output that runs from 0 to +5V, as well as changing the signal so that I can change the duty cycle of the pulse(PWM).
Should I replace... |
H: Using Parallel port to Power circuits
How to use PC parallel port as a power supply for any device (similar to charging Mobile Phones). Actually I have to powrer my circuit based on parallel port. Which pin of parallel port can supply at least 5 volts without cause any change(sending signals) to the pc.
AI: The PC... |
H: Meaning of balanced transmission line?
Simple question, what does it mean to have a transmission line (RS-485 in my case) balanced vs unbalanced?
AI: The two signal lines are mirrored around a central reference point - often but no necessarily ground. When one is 'up" relative to the reference point the other is ":... |
H: Using Zener diode for circuit protection on RS-485 network
I'm examining an RS-485 driver circuit that uses what look like Zener diodes between D+ and gnd and D- and gnd. Anode is connected to gnd, cathode to the D+ or D-. So in this arrangement the idea is for the diodes to shunt current if gnd goes above D+ or ... |
H: 10 bit PISO shift register
I have a device that has a 10bit parallel output that I need to get to a serial input.
Can I use a 16 bit PISO shift register and somehow ignore the 6 LSB?
How might that work?
AI: You should not have a problem using a 16 bit shift register (or two chained 8 bit shift registers similar ... |
H: Frequency Reuse Patterns
In Multiple Access Protocol for cellular networks, there is this Frequency Reuse Patterns. And I am given a formula to one of the patterns that states: \$\text{Reuse factor }\mathbf{K} = i^2+j^2+ij\$
I know that the reuse factor \$K\$ meant the number of cells that are reusing the frequenci... |
H: Why ship a low power charger with an overkill thick cable?
Today I saw a Sony camera charger that claimed to provide 8.4V/1.7A output but had a cable going to the device being powered with 18AWG (0.824mm2) cross-section and insulation rated at 300V (yeap, three hundred volts). It was composed of two single-wire com... |
H: What's the purpose of two capacitors in parallel?
What's the purpose of the two capacitors in parallel on each side of the regulator in
this power supply circuit
I've seen similar setups in other similar circuits and can guess that it's related to one being polarized an one not, but I don't really understand what'... |
H: What is the IEC standard number for this plug?
I need the specific IEC standard number for a power plug/socket used in a laptop. See the photo below. I need to know the laptop-side plug (the lower plug in the photo). Thanks. This plug is used in Lenovo laptop power supplies, and others.
AI: The lower connector look... |
H: What should I know about interference between wires in a multi-conductor cable?
I want to use a multi-conductor cable for a few different circuits. What do I need to know about interference between circuits within a multi-conductor cable?
Some of the wires will carry stepper motor coil supply and return. I suspect ... |
H: One USB device with multiple device types?
I am just wondering if this is possible with USB.
I am used to programming a device with USB to be a specific device type, say, a HID, or a CDC etc.
Is it possible to combine multiple device types into one USB device, so a single chip (say a PIC32) could be seen as both a ... |
H: Reset: synchronous vs asynchronous
I've been working with fpgas for years, and always used synchronous resets for every parts (that need it) of my circuits. It helps the circuit to be globally reset at a given clock cycle.
However, I was told that in ASIC circuits, people tend to use asynchronous reset everywhere. ... |
H: How to perform small value approximation for sqrt(x) on FPGA
I am trying to implement a fixed point routine which involves computing the value of \$ \sqrt{x} \$ for small \$x\$ that approaches \$0\$. The target architecture is an FPGA. One problem is that this function does not lend itself easily towards the use of... |
H: RS232 vs USB CDC quality of service / should messages contain a checksum?
Does USB have a quality of service guarantee for data sent between my USB-CDC device and the USB host?
I know with traditional RS232 in a noisy situation (e.g. automotive diagnostic port) bad bits happen often enough that checksums are import... |
H: Huge led matrix - using mm5451
Hi I'm using the MM5451 led driver chip to source current for my led matrix. Am told that the chip has open drain outputs. To source current from the chip do I just connect the anode of my led to the output then connect the cathode to my circuit gnd? Also am unsure how it limits the c... |
H: why electric motor or alternator have stack of plates?
i have noticed that all of the transformer/motor/alternator/electric actuator have a stack of metal for stator ( or where winding is done. ). why is that needed ? can same thing not achieve by using a block of metal ? i guess its because of performance. how muc... |
H: Calculating Voltage
I am trying to calculate the voltage \$Vw\$ of the following circuit:
I have little experience with these kind of problems, so I tried to solve first a more simple circuit that did not include the R2-L2-C2-R4 branch.
In the simplified circuit, I considered it as a voltage divider with \$\frac{... |
H: Is it safe to apply higher voltage to the output of a MIC2920A voltage regulator?
I made a mistake on a board recently when adding an optional PIC12F615 processor to supervise my ARM processor.
I didn't realize the PIC needed >4.5V to erase.
So, I've got this MIC2920A 3.3V regulator feeding the PIC (and only the P... |
H: Arduino: How to make a final prototype?
I've been working with my Arduino starter kit for a while and learning the basics of electronics. Now, I have a project that I would like to move off from the standard bread board that came with the starter kit. I'd like to make the entire board configuration smaller so I can... |
H: Is it okay to keep a USB charger plugged into the cigar lighter?
I have a USB micro charging adapter for my smartphone for my car. It is basically a cigar lighter plug that turns into a USB micro plug. When I don’t have my phone connected, and as such don’t want the adapter to draw any current, is it still safe to ... |
H: Best way to connect 2 USB devices to a single port
I have a 4GB Thumb Drive that the plug broke off. So I extracted the chip and hard wired it to an old cable to retrieve the data. Now I'm thinking it might be a fun project.
I have a USB Gravis Eliminator Aftershock game controller that I use to play games, and t... |
H: Why is high input impedance good?
Naive perhaps, but
Why is high input impedance a good thing?
Is high input impedance always a good thing?
AI: It is a good thing for a voltage input, as if the input impedance is high compared to the source impedance then the voltage level will not drop too much due to the divid... |
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