text stringlengths 83 79.5k |
|---|
H: How to run / pilot this motor
I would like to be able to run this motor clockwise and counter-clockwise and speed control.
I have 3 phase power 380 volts (AC) and this is a 110 V DC motor (max 40 amps).
What is the correct type of controller for this?
AI: There are a lot of DC motor controllers on the market. You ... |
H: Source follower basic question
I just want to clear my understanding about a basic source follower circuit. Following is the circuit
Here is my question:
Considering Vi > Vgs(th); Vo = Vi - Vgs. Also Vo = Id*Rs as shown in the picture. Now Id is defined by Vgs*gm. That much current MUST flow. If Rs is big then Vo... |
H: Digital Frequencies vs. Sine Wave
If we want to filter a digital signal let's say through an RC circuit, can we treat it as a sine wave? For example, if there is a 100 kHz clock, my guess is that we can't treat it as a 100 kHz sine wave but we need to perform Fourier analysis and find the frequency spectrum and the... |
H: Questions about STM32F103C8T6 pins/button
Recently I bought this STM32F103C8T6 minimum evaluation board STM32F103C8T6, see picture below.
I have some questions about it (see (small) numbers in the picture):
Button S1 is RST (reset button), however, what is the function of button S2? Is it connected to some GPIO a... |
H: How much current does USB webcam draw?
I have Microsoft HD3000 lifecam studio webcam.
I have some noise, when operating it in low light conditions.
I would like to minimize noise as much as possible, detaching infrared filter and using it as a grayscale imaging device.
As a software engineer i could go simple way:
... |
H: Schematic shows two outputs for Vout. Why?
How do I interpret the fact that Vout has two output points? My guess is that the two Vout points represent where I would place the probes on a multimeter. Is this correct?
See this diagram:
The article I'm reading suggests that there is only one signal for Vout, which ... |
H: In-amp output lower than expected
I'm trying to create a circuit that can sense the state of a SPST switch in a series loop (constraints don't allow for the use of a DPST switch). The idea is to expand this to work with more than just 1 switch in the loop, but for this example, I'm just testing with 1 switch to ru... |
H: How should I connect the external crystal in MPU6050
Datasheet for the MPU6050
I am having an external crystal of 32.768 Khz and I want to connect it to the IC,but as given in the IC's block diagram on page 24, I have a CLKIN and CLKOUT on the pin 1 and 22 respectively. But as given in the Pinout as well as in the ... |
H: Why does this Edge Trigger Work on input of 555 monostable config?
I recently wired up a 555 timer in a mono stable configuration and found that when the trigger was held low for longer than the configured output pulse width, the output would stay high. After thinking about this.. it made sense. My 555 timer is wir... |
H: Controlling a 5W 12V DC water pump
I have just bought this pump to circulate coolant through an experiment. I would like to control the pump output as it doesn't have any control on it.
It is being powered from a 12V 0.5A power supply.
How would be best to go about this? Voltage control or PWM?
AI: My reccomendat... |
H: Power-only USB connection to charge my phone - as simple as cutting the data lines?
In a pinch I bought a $3 "phone recharger" from the bin shown below, but now I am too scared to connect it directly to my phone, which costs orders of magnitude more. While a poor design could present undesirable qualities to the 5V... |
H: IEC 61000 vs IEC 61326? Electromagnetic compatibility(EMC)
I have been working on a product which requires EMC tested based on an IEC Standard. The product application is measurement and monitoring of various Solar String Parameters like voltage, current and therefore power. Some of the similar products in the mark... |
H: How to keep the bias current constant in class AB output stage?
I am working on a hobby project to build a small audio amplifier. Actually the idea behind the circuit is to build a 0.5W-1W audio amplifier that can be powered from a single 9V battery and have decent audio performance in terms of THD.
Keep in mind th... |
H: RFID solution for reading multiple tags
I am working on a Robot-project where a sub task is have to check how many and which RFID-tags are placed in a bucket.
Multiple tags will be placed into the bucket - so I run into the problem with RFID-tags colliding with each other. The reader will be connected and programme... |
H: Automotive Pulse Doppler Maximum unambiguous range?
I am trying to calculate the maximum unambiguous range for FMCW automotive radar.
In automotive, the pulse repetition rate (Tp) is typically 50 - 60ms. My equation is as follows:
where c is the speed of light. This becomes
Have I done the above correctly? 7 m... |
H: What is the difference between programing with JTAG and USART interfaces?
I understand there are 2 interfaces to programming NanoMind A712 computer: JTAG and USART. But what is the difference in programming the computer in JTAG or USART interfaces?
Datasheet: See page 10: "The NanoMind computer is equipped with a d... |
H: What to place first: termination or pullup/pulldown?
simulate this circuit – Schematic created using CircuitLab
I am routing some ethernet signals that have termination resistors as well as pulldown resistors, my question is that as the signal comes out of the chip, what should I place first - the termination resi... |
H: using 1.8V, max 40mA to switch a 12V, 70mA load (MOSFET data sheets?)
I recently asked a question about controlling a magnetic relay with a solid state relay.
The reason is that I'm controlling the circuit with a MCU that has a max ouput of 40mA per output pin and the coil on the relay draws 70mA. Also, the MCU is ... |
H: anything wrong with using a solid state relay to trigger a magnetic relay?
simulate this circuit – Schematic created using CircuitLab
I'm thinking to use a MOSFET solid state relay triggered by a MCU to trigger a micro magnetic relay.
I will be using a sufficiently rated flyback diode at the magnetic relay.
This d... |
H: MCU analog reference voltage and Voh question
If I feed 2.5v to Vref pin on a MCU runs on 3.3v, what is the voltage for Voh?
I though Voh would be around 2.5v but I found the following table for the MCU(http://www.st.com/content/ccc/resource/technical/document/datasheet/03/b4/b2/36/4c/72/49/29/DM00071990.pdf/files/... |
H: How To Remove This from PCB
I was wondering how I could remove the silver (chip?) from the center of this PCB. It appears to be held down by that clear substance (epoxy?). The PCB is small, 2 cm sides (Not sure if relevant but thought I would add).
I've never done this before and was wondering if anyone else had ex... |
H: LT1711 maximum supply voltage and maximum input voltage
I want to include the LT17111 comparator into my design but I cannot get some clear information from the datasheet here.
Can I power it from 12V and GND?
Can I put a signal with 8V amplitude into one of its inputs?
Thank you!
AI: Can I power it from 12V and ... |
H: Variable arguments via STM32 via USB
To make printf kind of debugging possible, I planned to use variable arguments to pass to the USB device as serial device.
Code to print a test string:
Debug::Print("Auto toggle 2 %d %s", 12, "!");
With implementation:
void Debug::Print(const char* format, ...)
{
va_list ar... |
H: USB problems with AT90USB646
I have tried implementing a design involving AT90usb646 about four times but in each case the board gets connected and immediately disconnects . lsusb outputs that an Atmel Corp device has been connected so I know that the board is working but it gets disconnected before I can do anythi... |
H: Simple inverting op-amp problem
I don't know what op-amps have against me, but they don't like me.
Yesterday, I wanted to amplify an AC signal coming from a photodiode using a non-inversing configuration mode. I had a lot of noize, so I wanted to inverse it twice.
My problem is the following: When I measure the vol... |
H: How does single coax wire transmit a lot of information?
I have a coax cable entering my house. The cable (from the Cable company), splits into a Cable modem (for computer network) and into a DVR (a.k.a. cable box).
How can a single coax wire contain digital programming information for over 100 channels and tran... |
H: What is the definition of absolute maximum ratings?
What is the definition absolute maximum ratings? Does it vary from manufacturer to manufacturer?
AI: So, short story is the definition of absolute maximum rating does vary from manufacturer to manufacturer.
Most every manufacture (of those sampled) will give a var... |
H: power supply for electrophoresis [100 V from 230V mains]
i am trying to make a power supply for electrophoresis, which requires 100V DC. The project is a funded non-profit for some schools, where there are strict requirements when it comes to the individual price.
One way to make the power supply is as posted in th... |
H: Heat problems for STM32F103C8T6 in enclosure
For my hobby project, I'm intending to add a STM32F103C8T6 (and later STM32F407VET6 or ZET6) into an enclosure.
For worst case case, let's take the 407, the datasheet can be found here.
On page 80, there are stated some power dissipations (between 435 and 543 mW).
Also s... |
H: MOSFET input capacitance variation with Vgs
Let's consider the classic FET push pull Class-AB follower.
simulate this circuit – Schematic created using CircuitLab
The DC operating point is determined by output voltage and output current, which set Vds, transconductance, and other parameters for both FETs. Let's sa... |
H: Why would current flow through at all?
I want to find the current through branch AB, CD, EF and GH and find out which batteries are being charged
However, the potential at A,C and E are the same(because B,D,F are equipotential and because of the way the batteries are arranged) and hence by ohm's law no current sho... |
H: How to calculate Impedance of Edge Coupled Stripline Coplanar Waveguide
I have some questions about adding copper pour on signal layers with high-speed differential pairs traces.
I am routing my HDMI diff pair traces on an inner layer. because we have been having some issues passing radiated emission tests, a colle... |
H: Postmortem: on a PDU with low Power Factor, why did all of our servers reboot?
I am a Unix SysAdmin with a crude understanding of electricity.
We had this scenario: 4 dual-PSU servers were plugged into a ServerTech Sentry Switched PDU with PIPS with Y cords. The circuit is 208V/30A. Circuit load is under 1A, so tha... |
H: Power flow analysis issue
simulate this circuit – Schematic created using CircuitLab
I'm trying to get the hang of power flow analysis and I can't figure out how to measure the power (P and Q) between two inductances.
[E source] ---> [L inductance] ---> measurement ---> [L inductance] -----> [U source]
Q = ((E... |
H: Why do different batteries of the same voltage have different results and which battery would i choose?
I want a power a homemade robot that uses an arduino and 4 small dc motors and a few sensors. Ive used pp3 energizer 9v batteries to power it in the past and they worked well, i used 9v again after they died but ... |
H: Nonlinear equation solvers in SPICE simulators
We have an assignment at the Parallel processing class, the target is to implement a Non-linear Equations solver on cuda based on Newton Raphson method and to interface this solver with an application that deals with nonlinear set of equations. We wanted to interface o... |
H: How to simply this 2 to 1 mux boolean expression
I am going through this tutorial for a 2 to 1 mux.
They create this circuit:
They then derive this boolean algebra expression and simplification:
I'm confused how they made the simplification though. I see that the expression can be simplified to \$I_0*I_1 * (\ove... |
H: Why voltage is the same after placing a resistor?
simulate this circuit – Schematic created using CircuitLab
Hi.
I'm testing a very simple circuit with a multimeter.
In Ohm's Law, a resistor should affect the voltage, but in my circuit it doesn't happen.
I'm using a Raspberry and on PIN 1 I have 3.3v at 0.076A.
Wh... |
H: Voltage biasing problem
How can I solve this question?
In the circuit below, the n-channel MOS device operates according to the equation:
i(D)=K(v(GS)−vT)^2,
where K is 9.2 milli-siemens per volt, vT is 0.5 volts. The values of R1, R2, RS and RD are 657, 328.5, 11.6, 11.6 kilo-ohms respectively. Solve the circuit a... |
H: Generating two signals with small difference in frequency using one oscillator
I am building a data transmitter for which I chose FSK modulation. The frequencies should be around 27 MHz. I have single crystal with 27 MHz frequency and I need to get two separate frequencies that will be different.
I thought about a... |
H: What additional components/boards are needed to use CAN with an STM32?
I have a STM32F103C8T6 (later I want to more to STM32F407VET6). Both have support for CAN. But what does this mean?
I bought (not received yet) an MCP2551 CAN Controller.
Do I need this or is this functionality already built in my STM?
And I thi... |
H: Can an audion tube amplify a pulsating direct current or must the current be converted first to an alternating current?
Can an audion tube use a pulsating direct current as input and magnify the signal from the electrons flowing from the filament without first converting it to AC current? The reason I ask is that ... |
H: Li Ion battery reconditioning?
My company have thousands of new Li Ion battery that is stored in ambient temperature for 3 years. Middle management then decided to manufacture products with these batteries.
I had already tested them, their current capacity drop to 85% rated. Then the management guys blurt out batte... |
H: Frequency changing element in an FM transmitter
In a simple FM transmitter such as this
What element does the frequency modulation? I don't mean the oscillation itself, since it's clearly created by tuned tank circuit, but the modulation. There is no VCO or anything so what exactly changes the frequency of the wav... |
H: How to flash a lot of devices like Raspberry Pi (More than 1000)?
Our devices based on ARM and eMMC memory on board, and how mass flash our soft on this devices? (More than 1000 devices)
AI: In manufacturing. You would provide the code to be flashed on the on board flash prior to assembly, or it would be loaded thr... |
H: Satellite Wifi Snooper with PoE
Because I live in a bus, I use paid-for hotspots to connect to the internet.
Sometimes I'm quite far from a hotspot, so I was thinking to use a raspberry-pi with both an ethernet connection and a wifi, attached to a long ethernet cable as my router.
Now my questions are about the pow... |
H: Why telephone dc voltage drops to about 8 volts?
I found out that the DC voltage supply is about 48 volts in the central office, and the typical line impedance is about 600 ohms. Also the typical current in off-hook state is about 20mA.
So with a simple calculation, I see that the dc voltage in off-hook state must ... |
H: Tactile switch technologies for soft feel
I would appreciate help comparing the various tactile switch technologies towards achieving a soft feel, conveying quality to the user, while keeping costs and dev time down. These are to be used on front panels of scientific instruments.
This is what I have done so far:
W... |
H: Possible cons of excessively long microphone cable (XLR)
I'm very new to this page and anything electrical in general. I considered putting this on the music SE page but I thought this site may prove more helpful.
I have a small personal "studio" (put very lightly) for recording my own music as a personal hobby. ... |
H: Want to know more about this op-amp configuration
When I see op-amp inverting and non-inverting amp configurations, I see the one on the left.
(only inverting circuit is shown).
This op-amp circuit has a gain equal to \$ {-R2}\over{R1} \$.
However, if I do the math I can see that the configuration to the right al... |
H: Mapping Opcodes to Binary
How does an engineer go about mapping opcodes to machine instructions? For example, say a new architecture has been designed that the engineer wants an ADD instruction to correspond to 3-bit binary code as 011. How would he/she "tell" the computer about this correspondence?
AI: Your quest... |
H: BJT Circuit at DC
I am having trouble understanding how circuit (a) goes to circuit (b). Specifically why (b) does not have 5V at the base with no resistor as equivalent to (a) instead of what it has.
AI: The transition from figure (a) to figure (b) is the bias network has been changed to the Thevenin equivalent.
T... |
H: Anyone knows how X86 platform set the PCIe bifurcation at boot up?
I got a question about the PCIe bifurcation setting when booting up in X86 system.
Normally, we can set the PCIe controller to be X16, two X8, or four X4 in the UEFI shell menu. However, there is an auto detection way to do the same thing automatic... |
H: What is this device attached to a high-voltage power line?
I noticed this white, cylindrical device on a power pole near Seattle that facilitates a 90-degree turn of the transmission line. It looks like the lightning conductor comes down the pole into a sort of service loop before disappearing into the device.
I i... |
H: Can is use the 2N7000 MOSFET to switch 12v from 3.3v?
I want to control some 12V solenoids (SH-04215-015) from a Raspberry Pi Zero W. I believe I need to use a MOSFET transistor to switch from the 3.3V of the GPIO to the 12V the solenoids need. I'm not sure what MOSFET I need though; I don't understand most of the ... |
H: Voltage gain of an amplifier?
Voltage gain of an amplifier is defined as
"magnitude of output voltage / magnitude of input voltage"
OR
"Vout(r.m.s)/Vin(r.m.s)"
OR
"change in output voltage/change in input voltage"
In the figure given below they say that the by using bypass capacitor C2 which is by passing R(E) ... |
H: ethernet connection of nxp processor
ı designed a circuit schematic by using altium designer to ethernet connection of my processor (nxp lpc43s50fet256)
ı added a circuit schematic as altium designer file .You can see my complete circuit schematic .I explained my question but maybe ı was not clear .Therefore l... |
H: How can I store unused silver conductive glue? Is it possible?
I purchased some silver conductive glue. How can I store the unused portion of glue so the needle and the metal portion won't get clogged up after its first use? I purchased it from Amazon a while back and the product is no longer offered.
AI: If, as ... |
H: Inner Resistance of TRIAC
Due to some problems in my project, I am curious about the inner resistance of TRIAC when it turns on. I have run some tests. The setup is just like the schematic picture.
Rs is the source resistance with about 160 ohm. Rg is about 50 ohm. The trigger voltage Vtr is about 2.5V. Then with ... |
H: Measure voltage when battery is connected to lead without resistance
When we use voltmeter without resistance,(parallel connection) I thought it might have potential difference between two points, because of this equation
V=Ed
I thought There should be small difference 'd' between two points. So i connected what i... |
H: How should I connect a braided shield 2-core cable with a headphone plug with three cores
I'm a beginner in Electronics.
The cable has two cores and a braided shield. What should I do about the ground?
AI: I'll assume your jack is a stereo one, like on this picture:
Cable shield goes to ground (see pic) and left/r... |
H: FSR linearization when using adc
I'm using Interlinks 30-49649 Force sensitive sensor(FSR), the FSR resistance decrease when the force applied increase.
the FSR datasheet has the following graph.
Looking into the graph, a 10K resistor for RM would be the best option, as using other resistors shows that there isn... |
H: 2 x 74LS181 4 bit ALU's cascaded to form 8 bit ALU, Cin problem?
When trying to add two numbers on my two cascaded 74LS181's I find that the result seems to be right when I tie the carry (Cn) of the least significant one to Vcc, contra my expectation that Cn should be low.
Trying to add zero and zero yields b'00000... |
H: Controlling max voltage (power supply) when Vin varies?
Is there a way to regulate max DC voltage on a circuit when the input voltage CAN exceed the desired voltage?
I'm trying to figure out power supply/regulation for a fan where the datasheet specs for 10.8v to 13.2v input at up to 4.6A. I have bench tested the ... |
H: heating elements
Is my (layman's) understanding correct, that the same resistance-type heating element can be driven by single-phase 120V or 240V current; that a different design is not required, one for each voltage, for example, a heavier gauge for the 240V? As I understand it (but please correct me if I'm wrong... |
H: Is it possible to use a AV-receiver output for an "active" speaker?
I have a 5.1 output and I'd like to use the center-chanel output for a soundbar. The soundbar is active (has optic, coaxial and 3.5 mm jack).
Is any way to convert the output of the center-channel from the AV-receiver to an output compatible with ... |
H: Symmetrical supply (or almost) in Opamps and Inamps
My question is in relation to the symmetrical supply in opamps and inamps. I did not find this information easily on the datasheet.
I have an INA118P inamp with gain 2, and in my circuit I have 2 possibilities of symmetrical power for it.
First: +-9V coming from 2... |
H: How to use ADC for battery operated application?
In my application VDDA = ADC Reference voltage and VDD = Microcontroller supply voltage changes due to battery drain form 3 V to 2 V so because of that my adc count not stable so what can I do to make stable?
AI: The STM32 microcontrollers have an internal voltage re... |
H: Where can I find ultrasound machine regulations?
Diagnostic ultrasound machines are limited in their output power so that the sound waves don't cavity the microbubbles in the body.
What I want to know is how do manufacturers prove their power output is safe?
The piezo crystals are variable, so just knowing the RF... |
H: Finding MOSFETs with greatest linear region
I want to make a cheap variable gain amplifier using an op-amp, using a MOSFET as the variable resistance. The circuit is for an audio application at line (signal) levels (ballpark of 1v peak to peak).
I need help in finding a suitable MOSFET. At the moment I'm having to... |
H: Cupboard lighting problem
I have some battery powered LED lights to go in a cupboard; and I have a 5-terminal magnetic alarm sensor to turn them on when the cupboard door opens.
The problem is that the lights turn on when the sensors are close together (i.e. the door is closed) and off when they're apart. I've trie... |
H: What do you call the cross-crossing network you see under a microscope?
I'm self-studying computer architecture and digital logic design and have a question regarding integrated circuits. When you examine a chip up close, such as through a scanning electron microscope, you see a layered, criss-crossing network. Wou... |
H: Are BJTs suitable for level-shifters? It seems FETs are more common,how do they compare?
I'm a hobbyist, and never got past the datasheets/tutorials for FET transistors; I'm a BJT man. I never found discussions dealing with BJT vs. FET and specific applications best suited for each type. My projects are very simple... |
H: How can I use a dual 4-channel analog multiplexer independently?
I have a CD4529BCN Dual 4-Channel Analog Data Selector (datasheet).
Here is the truth table:
Here is the problem:
I have two sensors which are resistive. I want to read their voltage via a resistive-divider and a buffer. I want to switch 4 different ... |
H: How many 12 V 100 Ah batteries do I need for overnight?
I actually want to upgrade my existing solar power system at home with new set of batteries that could live up the night when solar arrays are unable to charge but I am getting confused on how many I actually need to achieve this. My current inverter max draw ... |
H: Maximum current is drawn from a cell when it is shorted. But, why?
First, I must apologize for the trivial-sounding question. We've only recently started with Current Electricity in class, and our teacher posed this question (well, something similar) to us.
For what load (resistance) will the current drawn from th... |
H: Can I solder a wire to a PCB without a soldering iron?
I have a jbl clip 2 here which is not charging. I opened it up and saw that these 2 wires were poorly soldered and the red one was not even touching. So in the end I was left with these two unconnected wires, i don't have a solder I was wondering if I could glu... |
H: LED Forward Voltage Higher Than Source
Newbie question:
I have an Arduino board supplying 3.3v. I'm looking at LEDs. I've found one which I like, but it has a forward voltage of 4.4v.
Aside from any consideration towards resistors, would this be an optimal setup / would it break either the LED or the board?
I'm u... |
H: Is it a good idea to ground a high voltage DC motor?
I have an all metal fully enclosed 120VDC motor with the standard red and black wires. The motor will be mounted using screws on a cast iron metal lathe. The motor is powered via a DC speed controller in a grounded metal housing also mounted to the lathe using sc... |
H: Flow of current, isn't make potential difference?
I've learn some electronic knowledge at school and so confused by some questions.
Q1. IS it possible a flow of electricity without an electric field?
Q2. I've learn that moving of particle with electric charge in electric field makes potential difference. Then, let'... |
H: Sigfox RF module TD1208R: design a 50 ohm microstrip line on a PCB (Proteus ARES)
I'm designing a PCB (I have very little previous experience). Among other components, I am using the microcontroller MSP430G2553 and the RF module Sigfox TD1208R (868 MHz). I have doubts to design the trace from the RF pin of the TD12... |
H: Full Wave Rectifier and 7805 Regulator
I have make a full wave rectifier and aimed to obtained +9V, -9V and +5V DC from an AC transformer (I have diplayed output of transformer only as AC1 and AC2) as i have shown below.
However, when i connect the +5V output and +9V output together, i have observed a significant... |
H: DC Printer motor to AC
I know a little about electronics but I don't know that much and always happy to learn.
I have an HP printer that I am using in DIY project. It as one large motor (24v from what I have read online) and one small motor (no markings and I am guessing 12v plus).
What I need to know is what i... |
H: External interrupt on atmega328p
I want to connect 4 push buttons using interrupts on all of them, with my atmega328p, but when I read the datasheet, I found that the atmega328p has only 2 external interrupts (INT0 and INT1). Are there any solutions?
AI: The obvious: Connect two buttons to one interrupt and use a d... |
H: Audio voltage dimmer trickery! (Potentiometer not working as expected)
I'm a hobbiest with litte resources for parts, so I'm short on things I can use.
Therefore I'm trying to rescue an old amplifier's case and use it for a different project. The potentiometer on the front has got me stuck though. It's a slider sty... |
H: Converting a 5 Volt controlled current source to 3.3V compatible
I want to create a relatively simple voltage controlled current source with a 3.3V micro controller. I have found THIS circuit and it seems to be what I need. The problem is it is designed for 0 to 5V.
So here are my questions and my research so far:... |
H: Soldering wires to a 5V-to-12V converter
I have a small project that requires me to solder some wires to a PCB that converts 5 volts to 12 volts.
Here is a picture of the PCBs:
On the PCB to the left, there is no label of "negative or positive". How can I tell where to solder the red (positive) and black (negativ... |
H: Can rechargeable batteries with different mA values be used in the same device with good/normal results?
If I use the two AA batteries (shown below) in a digital camera (where two are needed) will I experience any odd behavior due to the difference in mAh, such as:
camera not working properly?
battery power being ... |
H: I2C communication ATmega328P slave: answer to general call but not to own address
I have the following problem:
I want to make two AVR Atmega 328P-Pu communicating together with I2C
No1 is Master (I2C address :0x01)
No2 is Slave (I2C address :0x02)
On slave answer to general call is enabled (address 0x00) and it... |
H: How to minimize, reduce and simplify electrical circuit that contains only resistors, transistors, capacitors and diodes?
Suppose that I have designed an electrical digital circuit that contains only resistors, transistors, capacitors and diodes to implement some electrical device, but it contains many instances of... |
H: LVDS: length matching within a pair and between pairs
I'm interested in the LVDS communication between a Zynq (Xilinx, xc7z020-1C) and a camera (ON semiconductor Python 1300 NOIP1SE1300A−QDI).
I have read some articles about USB2.0 where the maximum skew for the differential pair is given; it can then be derived t... |
H: Adruino External Pull Up Resistor Confusion
I have a project where I want to add a flex fuel sensor to a car that doesn't have one. I have the flex fuel sensor installed and wired. My plan is to use an Arduino to read the signal from the sensor and convert the frequency to the ethanol percentage. I purchased an ... |
H: Calculate consumed power/energy in discrete metering
Suppose I measure power consumption after each 1sec interval, and it is assumed that in between the interval, the power consumption of is same as of previously (n-1th second) measured value. For example, I have the following table:
nth sec power meas... |
H: LM2576XX Output Current
I'm confused with the terminology that is seen in the LM2576XX Datasheet:
"Specified 3-A Output Current". Does this mean that it will always drive 3A output current or does this mean that it is capable of driving a 3A load where I don't necessarily use 3A (my application only requires about ... |
H: Purpose of using diode with solar panel
I have been working on a design based on solar power. While browsing through some circuits on the Internet I came across these designs below
In these designs, why was a diode added between the solar panel and the voltage regulator chip? I understand that a diode will be usual... |
H: BJT Switch Design question
Ok so I am revising some transistors and I came across using BJT as a switch, so I decided to design a simple circuit to control an LED. I want someone to kindly check the steps that I followed and offer any suggestion, corrections or improvements that can be made.
The LED needs 20mA for ... |
H: Unity feedback gain?
In an example about oscillator
In the circuit shown in Figure, \$R_1 = 10 k\$, \$R_2 = 1k\$, \$C =
0.002μF\$, and \$L = 1μH\$. If the circuit is oscillating, find the voltage gain \$A\$ of
the forward amplifier and the frequency of oscillation
and in the solution it is provided the feedb... |
H: BCD - Karnaugh Map-Logic Diagram-Logic Array
hi there my english is bad its not my nature language so i translate some words i hope you catch the meaning,i study informatics and i can confess i have trouble with an exercise on the lesson electronics.I try solve a lot of exercises but i dont know, i stuck i cant so... |
H: Parallel resonant circuit depending on voltage
In a parallel LC circuit, does an applied amplitude of voltage change anything when it comes to choosing the capacitor and inductor (except the voltage rating of course)?
I know that bigger L causes bigger Q, but besides from that, will the same current flow if I use a... |
H: LM386 amplifier buzz when not connected to signal
I've set up a simple LM386 amplifier on a breadboard according to the above schematic. When connected, the amplifier works like a charm driving a spare 8Ω speaker with impressively low (audible) noise.
On the input (pin 3) I'm connecting just the left channel of a ... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.