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H: Equal voltage, but not shorted?
This is a fundamental circuit question. Suppose two nodes of a circuit are always kept at the same voltage by some unknown mechanism. If I now connect these two nodes with a wire, would it introduce any changes to the operation of the circuit?
For example, in an ideal op-amp, the two... |
H: C2 & JTAG Interface compatibility
I'm working on a Silicon labs MCUs. Few of it's MCU requires JTAG while few requires C2 interface for flash programming and debugging. Below I've uploaded a image for JTAG & C2 Interface. And it's been the same adapter used for both the interface.obviously they are compatible. JTAG... |
H: BLE-serial module barebone (just need TX/RX and AT interrupt)
I want to add to my project, a BLE module; althought I am totally confused about which one should I get.
I did check most of the common chip available; and I do not get exactly if I can just use the chip as is, or if it require extras (crystal, resistors... |
H: How much physics is necessary for learning Electronics?
i am a CS student i wanted to enter the field of "Internet Of Things", got a recommended book "Art of electronics" now my physics base is school level but my Calculus 1 is pretty rock solid so i have two options right now:
1> Read Feynman vol 1 & 2 and then st... |
H: Simple way to generate a two-level pulse?
I am looking to generate a two-level pulse as follows, where the adjustable parameters are \$V_1\$ and \$V_2\$ between 0 and ~5V, and \$t\$, ~5 to ~50 ms:
The trigger pulse length may be anywhere from a few milliseconds to tens of seconds. If its duration is less than \$t\... |
H: What physical construction features in a transformer control the dot polarity?
As we know, the dot convention is used on transformer symbols to denote whether the transformer "inverts" the signal passing through it or not. However, I am not clear on what in the physical construction of a transformer determines the... |
H: Current, when Zener and normal diode in parallel? (picture inside)
1.) What are the currents , I1 and I2? And why?
2.)
What are the currents here (when the diodes are the same):
Thanks.
AI: I1 = 0 mA, I2 = 10 mA. The diode have lower voltage drop (0.7 V) than the zener (5.6 V).
Hard to say, I1 = 0-10 mA and I2 =... |
H: Choose DAC for audio
I am trying to play music from a PIC microcontroller using a DAC. I have seen other similar questions, but they use parallel interfaces and I am hoping to save pins with SPI as the interface. I saw this chip MAX541CCPA and thought it looked good, but I don't know what specifications are impor... |
H: minimum detectable signal of an IMU (MPU 6050)
I want to work with the MPU 6050 IMU, but before I have to check, which minimum detectable signal the IMU can measure or rather what is the lowest change of angle the IMU can measures.
I have the specification of the MPU 6050 and I know that the sensitivity is responsi... |
H: DB9 male or female Connector in Board
In my design I am using RS232 with DB9 connector in my PCB. idea is to log the data in PC and for programming via serial. Which connector I need to use in my board , it is male DB9 or female DB9.
Q1) What connector I need to use in my board male or female
Q2) If I use male co... |
H: Read latch versus read pin (8051)
As far as I understand, the 8051 microcontroller is able to read a pin
(1) by reading the actual pin, assuming the nFET is in cutoff (so a logic 1 is written before reading the pin)
(2) by reading the corresponding latch
Now is it true to assume that reading the latch only makes ... |
H: Op Amp in buffer configuration is decreasing output voltage
I have a 4.24V DC signal which I have to apply a buffer in the purpose of have a high impedance between the 5V signal and Op Amp output. My circuit is like following:
The problem is that my output voltage presents aproximattely 3.8V
Why the Op Amp in buff... |
H: What type of controller is this?
In many simple microcontroller power controller applications, I see controllers that work in an "increment/decrement" on error with hysteresis implemented e.g.
if(targetvoltage<errorvoltage) PWM_Output++;
else if(targetvoltage>(errorvoltage+hysteresis)) PWM_Output--;
SetPWMOutput(PW... |
H: 555 timer explanation
I have a short question.
I have to read this text regarding the 555 IC:
LINK
As you can see, there is the following sentence:
"Even at 5V, the 555 will easily drive LED's and small relays."
Can someone explain to me what exactly does this mean? Like...
Why is is true?
Why is it important?
Th... |
H: How do I connect these clips?
I bought a couple of clips like this . Does anyone know how to connect them?
AI: To attach them to a wire before initial use pull out the plug on the top, feed a wire through the hole in the plug, solder the wire to the metal part on the other piece, then push the plug back into place.... |
H: Two LEDs but they are different in brightness
I have duplicated the circuit below where the TTL side is a XBee Radio. The LEDs on TTL TX and RX are the same part number, the resistors are the same value and they are being driven by the same VCC level. The problem I am having is that when they are biased, the TX i... |
H: 555 Maximum Duration of Output
One more short question on 555. I am required to say what is the maximum possible duration of the output pulse (or signal). I looked it up online (including the datasheet for 555), but found no such parameter. What does it depend on and what is that maximum value (if it exists)?
Thank... |
H: Does N-type or P-type semi-conductor show electrical effect?
I am reading the book Electrical Engineering 101. It's a book of basics for not-so-newbie.
It contains below description in Chapter 3:
A diode is made of two types of semiconductors pushed together. They
are known as type P and type N. They are created... |
H: Convert falling / rising edge to pulses with minimal components
I have a signal that changes from high state to low every few minutes, after changing state it will remain constant, all level changes are clean.
I'm looking for the smallest possible circuit that can detect a rising edge and falling edge (could be two... |
H: ATmega - Why is the prescaler factory defaulted to 8?
Why do ATmega (e.g. 328P or 644P) have CKDIV8 (or CLKPS = 0011) factory programmed along with a default internal 8 MHz oscillator?
From the 644P documentation: 6.12.2 CLKPR - Clock Prescale Register, Page 40:
The CKDIV8 Fuse determines the initial value of the... |
H: Strange Distortion from Second Order Active Low Pass Filter
I'm feeding a 250KHz PWM audio signal from an ATtiny85 into a second order active low pass filter:
The output is then fed into a decoupling capacitor and then into an LM324 amplifier. The output of the LM324 is then fed into a decoupling capacitor and th... |
H: Mono jack output to stereo headphones : how to send the mono signal to both sides?
I have a 3.5mm jack mono output. I'm plugging standard stereo headphones into this jack, and it plays only on one side. I want the sound to come out on both sides in the headphones (same signal, but in both ears).
How can I cut and ... |
H: LM1496 maximum input voltage
one last question like that. I have the LM1496. The datasheet says that the maximum input voltage is 5V.
DATASHEET
The question is why is this true? What determines these 5V limit?
Thank you!
AI: Although the abs max for the supply is given as 30v, which is determined by collector-base ... |
H: How to check currently which PWM device is active and in which pwmchip on BeagleBone Black?
I would like to control a servo motor using PWM. I have loaded the following .dtbo's in the slots in bone_capmgr directory as shown below:
root@beaglebone:/sys/devices/platform/bone_capemgr# cat slots
0: PF---- -1
1: PF---... |
H: When can I use the formula P=V^2/R?
I'm currently learning about the transportation of electrical energy through power lines. I now know that transporting current at a very high voltage cause minimal power loss compared to transporting it at a very high amperage.
However, one of the formulas I've been given to calc... |
H: What's the differences of these usage of PNP, NPN transistors?
I am reading the book Electrical Engineering 101.
When talking about NPN and PNP transistors, the book said this:
Use an NPN to switch a ground leg and a PNP to switch a Vcc leg. This
might seem odd to you at first. After all, they are both like a
... |
H: Capacitor charge - why a resistance is needed?
I'm wondering why every example of a circuit capable of charging a capacitor has a resistor in it. Why is this resistor necessary?
AI: All real circuit has some resistance, even superconductor [upd: no, superconductor has no resistance]. You could assign it value 0 Ohm... |
H: LCD cbc016002A29 backlight resistor value
I'm trying to connect a cbc016002A29 LCD to 5V, and the tutorial I'm following says:
Next we'll connect up the backlight for the LCD. Connect pin 16 to
ground and pin 15 to +5V. On the vast majority of LCDs (including ones
from Adafruit) the LCD includes a series resis... |
H: Power a 12 volt water pump from a 110 watt solar PV panel
I have a 12 volt DC 9 amp water pump that I would like to power from a 110 watt 12 volt (17.2 volt at peak) 6.4 amp solar PV panel. I only want to run the pump when the sun is out, it's circulating water through water heating solar panels.
I'm not an electri... |
H: The metallic plate behind >2010's CPU's heatspreading plate is the actual chip die substrate?
I'm trying to find a formal document about the packaging of modern Intel's CPU's to learn about CPU chip construction. But explanations are quite basic and informal sources differs whether the metallic looking plate behind... |
H: Will light turn on in a closed circuit for a moment if a diode stops electric current after light source is reached?
I drew an example of the closed circuit I was thinking of for my question. Below I have the diode stopping the electric charge after it has already passed through the light bulb. My assumption is tha... |
H: Does several PIC12F683 pull-ups cause short circuit
I am connecting several PICs together by GP4 and GP5 pins, and I used their internal pull-ups to make pins high by default. If in all PICs pull-ups are enabled. Does connecting a lot of PICs together (i.e. 25 PICs) makes a low pull-up that causes short circuit whe... |
H: I found what looks like a crystal oscillator with an xdl stamp I haven't seen before
I found an old transmitter with a crystal oscillator on it, when I looked at this I saw that it had "xdl 17.734475m" stamped onto it, I've only ever seen oscillators with just their frequency written on them.
I tried searching the ... |
H: If I sent a message through a single-circuit telegraph across a copper wire to the Andromeda galaxy, will my message be received instantaneously?
I recently learned that electric current flows like a bicycle chain where all the electrons push each other at the same time. This got me thinking. Would this have the sa... |
H: Power consumption of Cortex-M7-based microcontrollers
I'm designing a USB-powered microcontroller board, and I'm considering choosing a Cortex-M7-based microcontroller for it (I want a double-precision FPU, along with other features M7 offers). Currently, there are 2 MCU families commercially available:
STMicroele... |
H: Using an Arduino (If Needed) to Charge 18650 Battery
I am looking for a way to charge 18650 battery with an Arduino (If needed) as simple as possible.
I have seen tutorials where you have to buy 10 diffident parts. I just want the simple (But wont light it on fire Haha) method for a poor kid with 30 battery's extr... |
H: How to differentiate a control path signal over data path signal?
I'm really new to digital systems. I'm trying to understand the difference between control path and data path. As far as I understood data path is where all the operations regarding ALU and registers happen. In control path we basically controls the ... |
H: How to translate from data sheet to actual pin function (blank Atmel SAMD21)
I am looking for a way to actually read an Atmel processor (SAMD-21) pin setup; but I am not sure how do you actually get the right info from the data sheet.
I did read the pinout, which has names like PA00, PB03 and so on; reading in the ... |
H: 3xAA Battery Pack how to wire?
I've mistakenly purchase an unwired battery pack, I'm unsure about how to wire this, never done anything like this but I thought if try and understand wiring a bit better. I have a 3xAA battery pack that I bought from Maplin but I don't know how to wire it, all the tutorials I see alr... |
H: Weird behavior of 'soundcard' oscilloscope
This is what I did
I expected a nice square wave on my soundcard oscilloscope software but I'm getting this
What is happening ?
AI: AC Coupling.
Sound cards have a capacitor in series with the input which acts as a high pass filter, removing frequencies lower than arou... |
H: Would analog multimeters measure correct dimmer's output?
Because I decided to regulate 230VAC with a dimmer (or SCR chopper), I want to measure the outcome (which is very big noise!) with a voltage and current meter.
I know I am supposed to take true RMS instrument, but would analog work too?
I don't find it logic... |
H: How the transistor works in this 555 circuit?
555 Is not able to provide long timing due to its leakage current.
The following circuit is very useful to build a long time timer such as 1 hour or more.
The accuracy of the time is not important for me. I don't care if the 1 hour become 50 min or 70 min.
I know how m... |
H: What kind of elements are these?
I disassembled a LED lamp and it's circuit. My intention is to rebuild that circuit within EveryCircuit app, to understand how it is working.
On this circuit I found two elements that are rising questions to me.
A) I couldn't find a reference for “CY40(0|D)474JE“ To me it looks lik... |
H: Division circuit
On the picture below is shown a circuit for arithmetic division. Can somebody please tell me how does it work? I am struggling to understand it as I am new to this area.
Note:
This is not a homework or any school project, the ilustration is from my teacher's presentation, without any additional inf... |
H: Small DC Motors
I'm trying to define what a small DC motor would be. I'm having problems why some kind of DC motors can't be built in small size.
Look this diagram:
I'd like to know why some of these kinds of motors can't be small, I mean, in constructive ways.
When I say small, I mean motors like this one:
Thank... |
H: Which circuit is more Stable?
The circuits in the picture are basically opto-couplers connected to a relay circuit. The input pin of the opto coupler is connected to a MCU and the output of the opto coupler is connected to the relay. Initially I was using circuit 1 but then I modified it to circuit 2 since it uses... |
H: Pic24f microcontrller often restarts when placed in metal box
I have developed a vehicle tracking application , everything works fine nothing wrong in wrong condition. I want to check out the signal strength of the modem so i placed the modem in a Metal box , a new problem has raised (i.e) My modem and micro contr... |
H: Pull up/Pull down power consumption
For a microcontroller, does pulling up a GPIO pin consumes more power than pulling it down? (I've got the option to pull a GPIO pin up or down)
AI: It doesn't consume power if the signal is in the state it is pulled to, i.e. HIGH if pulled up or LOW if pulled down.
Therefore it j... |
H: Combining Solar Panels Safely
I have a solar panels, with 5v with a 200ma output, I have it so this goes to a charge module which allows 3.7v lithium batteries to charge without exploding on me. If i hook another solar panel, same as the last one, into my build, will this put too much voltage into the charger modul... |
H: AC voltage measurement with a microcontroller
I want to build a circuit that will eventually calculate power, power factor and thd for a light switch or a wall outlet. But I'm having some problems with the voltage measurement circuit.
simulate this circuit – Schematic created using CircuitLab
The effective voltage... |
H: Removing offset due to PNP output
Below is the complete circuit for a PWM control output:
(please left-click to enlarge)
"Out" in the schematics will be directly connected to PWM input of a 3-wire or 4-wire DC fan.
Since I don't know the input impedance of the fan, I decided to use a PNP transistor at the output ... |
H: Power categories in ASIC design (Design Compiler)
I am currently working on the synthesis, with Synopsys' Design Compiler, of an AES encryption module.
In the power reports there are three power categories specified :
Switching Power
Internal Power
Leakage Power
I understand what is the Leakage Power but I can n... |
H: Eagle library multiple packages in one device?
So in an Eagle library, the device is created by joining schematic symbols with pcb packages. You can have more than one symbol in a package... (a quad opamp). Is there anyway to have multiple packages linked to one symbol?
AI: As far as I know, that isn't possible t... |
H: AGC with multiple op-amps
I have four op-amps that are each amplifying signals from four different microphones. All of the microphones are recording a single source, but the location of the source moves, so the outputs from each amp are different magnitudes, based on the distance to the source. I want to create a... |
H: Testing VOH, VOL, VIH, VIL
How would someone test Vih, Vil of an input pin (Or VoH, VoL of output pin) of a SoC. With an inverter, you could easily see the results but with a microcontroller/SoC, it seems difficult without the device being used in a circuit.
https://www.arrow.com/en/products/am79c874vd/amd#page-2 F... |
H: Effects of using a different PWM frequency than specified on device
I am wiring up a fan speed control circuit that creates a PWM frequency that is used by a PWM fan (the fan and its specs are pictured below). The fan claims that its PWM control is done through a 25kHz frequency. What will happen, in any situation ... |
H: protection device on power line and io lines
I have seen many design to protect nput circuitry from surge , EFT and ESD
Mov's for surge protection, Choke for Conducted emission TVS for ESD. still i am confused on below point
Q1) If surge is applied to both input power line and all I/O lines then why most of design ... |
H: Motherboard RGB diode control and resistance?
I've recently acquired a new motherboard for my PC which features RGB strip control. That's well and good but I have particular need to control a single RGB diode with that same header.
The issue I'm facing now is that I'm not sure what form of resistors I need for my ... |
H: LM393N output doesn't behave as expected
I am currently working with the LM393N and am inconsistently getting a high output when it should be low. Below is a schematic showing the inputs and outputs of the IC.
VCC is coming from a "12V" rail supplied by a 12V zener with a 5K current limiting resistor and a 47uF ca... |
H: Supply Voltage of the Instrumentation Amplifier INA332 from TI
At page 2 on top left there is written "Supply Voltage, V+ to V- ......... 7,5 V"
Low-Power, Single-Supply, CMOS INSTRUMENTATION AMPLIFIERS
Is that the supply range? Or is it meant like maximum V+ = 7,5 V and V- = 7,5 V (range would be 15 V)?
I can't fi... |
H: Use of 230VAC overcurrent protection for 24VDC circuits
Is it right to use 230VAC overcurrent protection for 24VDC circuits? Why? Why not?
For example: http://www.tme.eu/en/details/a9f05120/circuit-breakers/schneider-electric/
I saw some machines which have this kind of overcurrent protection in 24VDC circuits. I a... |
H: Logic family for 3.3 V microcontroller interface
I need to generate a bunch of chip selects for a SPI bus that I want to use on a project. I will use a 36 position (similar to PCIExpress = cheap) card edge connector and etc.
The bus is simple :
Pin 01 -> Clock
Pin 02 -> MOSI
Pin 03 -> MISO
Pin 04 -> CS#1
Pin 05 -> ... |
H: Changing Direction of twist in a twisted pair (24V 4A)
I have two wiring harnesses one going to my power supply (24V at 5A) and the other harness going to my main board, there is a motor controller on the board so it can draw a few amps. I noticed that the harness coming from the power supply has a left hand twist... |
H: What will happen if I connected 3amps adapter to motor that's need only 2.1amps are that will burning the motor?
I have 3amps power supply and the motor just need 2.1amps so if I connected they together are that will destroying the motor ?
AI: Assuming the voltage of your power supply is equal to the voltage requir... |
H: USB, UART, SPI difference and usage?
I am trying to enabling an embedded system built around Intel D1000 MCU. I am mainly from a software background and just starting to catch up with some hardware knowledge.
I am trying to build connection between an EEPROM and the MCU. My target is to enable this path:
User burn... |
H: Ferromagnetic core with air gap
N=200
I=N*8A
l=20cm=2*10^-1
d(delta)=1mm=10^-3
M=?
M=(B/μ)-H
How can I get the vector of magnetization? The relative permeability is not known. Everything I tried so far needs this value. There is no "shaking" of the magnetic field in the air gap.
Is this true Hm=-Ha (H magnet =-H ... |
H: Designing Butterworth Filter
I want to design butterworth filter in matlab only based on order of the filter and the cutoff frequency in Hz.
the syntax is for returning the ABCD matrix of statespace is
[A,B,C,D] = butter(____)
I tried doing below for 2nd order and 30Hz cut off
[A, B, C, D] = butter(2,30)
But i g... |
H: 35V LED power supply driving 11V LED - what happens to the "unused" power?
I have a bunch of 10W lamps (like this one) with incorrect power adapters for the emitters - the drivers are meant for a 1x9 configuration (35V, ~300mA), LEDS are 3x3 (~11V, ~900mA).
I am fine with running them at 1/3 power, for now.
Questio... |
H: CE-compliant Schuko mains power switch: do I need to switch both poles?
I am currently revising a plug-in power meter (i.e. a power meter that you plug into mains, then plug the DUT into it) for CE compliance. It features power switching using a latching relay, only on one pole. Because Schuko is reversible, do I n... |
H: Transfer function of R and C parallel
Currently I am learning control systems.
I specifically find the mathematics very hard to understand.
For my exam I am practicing on this question:
"Determine the transfer function of this circuit in the S-domain."
I came to here:
I don't know if it's correct and I don't kno... |
H: VHDL - Issue with simulation of testbench - Modelsim PE Student 10.4
I'm very new to VHDL and got an issue with the simulation time in Modelsim PE Student Edition 10.4.
I wrote some files for a RTL-model such as multiplexer, demultiplexer and register.
To test my code I tried to implement a testbench for each file... |
H: selective photodiode transimpedance amplifier
i would like measure a tiny bit off reflected light from a modulated led in an ambient light environment.
I'm afraid the large ambient light output wil saturate my amplifier with the high amplification i need for the modulated led output.
Is there such a thing as a sele... |
H: How does inductance change with presence of different directional magnetic fields?
If I design a coil driver for a certain application, I assume there is a fixed load right? It may have drive any inductance between an interval but you can not drive any coil, because the driver is designed for a certain application.... |
H: Faulty display behavior using a Atmega328 due to (wrong?) logic voltage level
I have built a little circuit using a Atmega328P to drive a DD-32645C-2A display using a connector board. The display uses a SSD1303 driver.
So here is my circuit:
Pretty straight forward, I think. I use the C port to set the control pi... |
H: Step-up converter for 20 mV input
For an experimental thermo-electric generator (TEG), developed by a colleague for low-power energy harvesting, it is possible to achieve an output power of 400 uW at the maximum power point. The voltage is 20 mV and the current is 20 mA.
This voltage needs to be switched up to at l... |
H: Is there a way to batch copy port names over to net names
version Altium Designer 15.1
Scenario
I have a several pins wired to ports.
I want to remove the ports and add net names to the corresponding wire
I want the wire net names to be the same as the port name for now. I will add to the net name later.
Questio... |
H: Understanding Lead in a causal system
I've gone through school and done all the work but looking back at it i still don't quite get it.
The rule is current in a capacitor leads and in an inductor lags. The inductor makes perfect sense but the capacitor doesn't.
We live in a causal world. Nothing from the future c... |
H: How to amplify a 25khz square wave that goes from -3.3v to +3.3v so that the amplitude is doubled
I have a 3.3v power supply (lithium ion battery) and am using a TI MPS430G2553 chip to generate a 25khz square wave using 2 PWM pins and a push-pull setup. This square wave goes from -3.3v to +3.3v. I need it to prod... |
H: How do zener diodes regulate voltage?
So i read about the Zener diode voltage regulator circuit in the The Art of Electronics book, it made no sense to me, then I read about it in this article which was helpful but I still don't get it:
simulate this circuit – Schematic created using CircuitLab
How is it reglating... |
H: Why Hall effect sensor has only three pins?
Hall effect sensors have three terminals (pins). Why not four?
(source)
AI: A typical packaged hall effect sensing device includes extra circuitry to convert the tiny hall effect differential voltage into something easier to use.
In the second image you show above, you c... |
H: Does audio OP-AMP circuit needs output capacitors?
I saw schematics with and without output capacitors. So in the end - do you really need capacitors in the output?
I am using OPA2134 operational amplifier. I plan to use it both as headphone and line amplifier.
Schematics without output capacitors:
*
*
AI: In e... |
H: What are all these pins on the DS1307 RTC for?
I recently ordered a DS1307 RTC from ebay. Before, I did some research and found out that you only need 4 pins for it: Vcc, GND, SDA, and SCL. The one I got has many other pins like DS, BAT, SQ(I read that this one is optional). It also has 2 DS pins, 2 SCL, 2 SDA, 2 V... |
H: Can you use less then the rated current on a High Side Smart Switch such as BTS555
I often see Minimum Current listed on the data sheets of some Smart Switches, Power distribution Switches etc.
For example in the data sheet of BTS555 it states that the minimum current is 128A so does that mean my load should be at ... |
H: Waveform at the switch of a boost converter. What is causing the oscillation when the switch is open?
I see this waveform at the switch of a boost converter, which is based on LM2588. I was expecting to see a square wave (or something close to it, like trace A on fig.48 in the datasheet). Instead, I see this osci... |
H: Could anyone tell me what is the usage of the circuit within the red frame
The whole circuit is used for measuring voltage, but I am wondering what is the usage the circuit of the red section and how to analysis it? could anybody offer me some anlysis? Pleas ignore some notes in this paper…
AI: It is a voltage divi... |
H: RTC Battery Voltage Error; Non-Ideal Op Amp Error?
First post here from a hobbyist electronics guy so please bear with me. I'm happy to do whatever I can to improve my question for the community.
For a bit of a backstory, I have a project that requires an RTC for a Raspberry Pi. I need the RTC to be thin, at leas... |
H: Should I indicate that beryllium compounds exist in a device?
Many years ago I built a power supply (an Elektor design) which used a 78HGKC voltage regulator. The data sheet explicitly said not to open the TO3 package as beryllium oxide (BeO) was used for thermal transfer.
Today I learnt that BeO ceramic can be use... |
H: What are some common applications of the MOV? (Metal Oxide Varistor)
The owner of a broken washing machine recently asked me to examine a damaged circuit board he had found inside. Using the schematic I was able to determine that the charred area formerly contained a device labeled MOV. I found several of these dev... |
H: Impedence of 90° out of phase Capacitor and Inductor in parallel
I'm curious as to what the equivalent impedance would be of these two elements. Mathematically it seems that they would have infinite impedance (meaning an open circuit), but this doesn't make any sense logically. If anyone could shed some light on th... |
H: Phasor math for balanced 3 phase circuit
Are there any mathematicians in here? I am currently reading my ECE text's chapter on AC machines and i referred to some material in the chapter that first discussed AC circuits.
In the photo below of the math, I am unsure of how on the right hand side, the subtraction of t... |
H: ultrafast catch diode for relay
Is there any reason to not use a UF2008 as catch diode on a DC relay, solenoid, or electromagnet? IN4001 costs $0.07 and UF2008 costs $0.03 and seems to be better suited in all ways
simulate this circuit – Schematic created using CircuitLab
AI: Either diode is fine in this applicat... |
H: Why are Edison screws allowed to be used?
Why are the Edison screws allowed to be used? They seem unsafe. Why are they designed that way?
They require a complete grounding system to ground devices for the rare situation where the hot wires somehow touches the metal case of the device
While they let you use a lamp f... |
H: one-way RF signal diode
Is there a special diode or band pass filter that will only allow RF signal to go though a wire in one direction like a diode does with electricity?
AI: Yes.
There are two options for non-reciprocal devices, unfortunately neither is 'simple like a diode', they are an isolator, and a buffer a... |
H: Use of ESD Tape on device
Where to use ESD tape?
I have ATmega 16 IC . So if i want to put ESD tape, where to use it?
My Atmega IC freezes.So I think it is due to use ESD effect.So I want to ESD tape on it.
Shall I put it on the device without touching the GPIO pins?
AI: ESD tape is used to protect sensitive device... |
H: 74HC161 synchronous counter
I have one question on the 74HC161 synchronous counter, you can find the datasheet here:
DATASHEET
How can it be used as a downwards counter?
Actually, is it reversible at all?
AI: The HC161 is an up counter. You need an HC191 for an up/down counter.
You could re-interpret the outputs as... |
H: mosfet bootstrap explained
I'm trying to get a hold on bootstraps for high side n-mosfets. as i currently understand it, it works somewhat like this:
when pwm is high, mosfet is closed and capacitor is loaded to 12V.
when PWM goes low -> gate gets 12V -> mosfet is kind of on -> witch brings source up to 12V -> ne... |
H: How to calculate total power from spectrum?
I'm trying to measure total power(dBm) from the following spectrum, the spectrum is 5MHz wide, the peak power from the spectrum is about -40 dBm,
I have an array of spectrum points(Power vs Frequency), now my question is how do I calculate total power from the array?
I a... |
H: Altium: Merge two polygons together
I'm having trouble merging two polygons together; when I select them they have the same nets.
They are on the same layer and they have the same net, but they stay separated when I draw them. How do I merge them?
AI: In your polygon properties (double-click on the polygon to open ... |
H: Altium Microstrip routing
I am currently trying to route a micro strip for a GPS and GSM antenna on Altium which got some constraints on spacing with ground poured plane like the one shown just below:
This is currently my design below and I need to adapt it to try to match something in similar shape than what is ... |
H: Decoding in VHDL - Bit masking
I'm searching for the optimal way to do this in VHDL:
"000" -> -------1
"001" -> ------1-
"010" -> -----1--
"011" -> ----1---
"100" -> ---1----
"101" -> --1-----
"110" -> -1------
"111" -> 1-------
Is there a better way to do this than an big switch(case)? I was told to use a for loo... |
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