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H: AVR-GCC initialization code
Consider the following asm.S
.global main
main:
rjmp main
Compile and dump it with these commands:
avr-gcc -mmcu=atmega32u4 -g -o asm.elf asm.S
avr-objdump -S asm.elf
In initialization code, among other, there is this command:
ae: 1f be out 0x3f, r1 ; 63
Why there is this... |
H: Powering 12V / 5W device at minimum cost and steady life duration
I want to power one particular device that feeds of 12V (5W) electricity.
However this device is intended to be highly portable and as such, I am quite tight on space, which means 12V accumulators are too big for this purpose. Also they are in fact, ... |
H: I2S TDM channels maximum bandwidth
Does I2S support sending multiple mic (around 20) channel data? If no, what is the limiting factor in supporting multiple mics?
Also, is there any way to send multiple channel data from different MICs in any other format other than TDM, if TDM on I2S doesn't allow more than certai... |
H: Is a MOSFET's body diode different than an ordinary silicon diode at audio frequencies?
So a friend of mine asked me to evaluate how hard would be to build a guitar effect like the ones described in this thread. The pedal in question is a customization of the Ibanez Tube Screamer. The central part of this effect is... |
H: Passive Low Pass Filter
What I want to do is make a low pass filter using a simple RC circuit (first order), or possibly an LC circuit (which would be second order). Right now, I am in the process of determining the values for the resistance of the resistor and capacitance of the capacitor (I'm currently going with... |
H: Verowire woes - how to reliably solder it?
I'm using Verowire (wiring pencil, Road Runner, you name it) quite often to contact test points on my board to make them accessible for measurements (oscilloscope probe, multimeter clamp ...)
Image source: Not a number.
Every now and then it happens, that the insulation w... |
H: Oscilloscope ground-probe causing test circuit to malfunction
Today I was trying to measure the rectified SMPS incoming power supply ( 315VDC) using a tektronix TDS 3932C oscilloscope with P6139A probe. Every time the ground-probe touches the ground of the supply, the power supply rectifier diode is getting damage... |
H: Avoiding turn-off of zero-crossing optotriac
I'm designing a circuit that switches a load using a regular TRIAC (say, a BT-137) being fed by a MOC3063 - an optotriac with zero crossing detection. The circuit being fed by the TRIAC can be either a resistive load or a diode bridge, so there may be no current at the m... |
H: Protective diode across dump load
I have a rectified DC Voltage and I will switch in a dump load resistor. I have a 25PV045 Schottky diode connected across it as a flyback to deal with the inductive properties of the load when the switch is turned off.
I also have an LED which goes on when the switch is on and this... |
H: Understanding power system lines and their capacity
First of all, I am no engineer so forgive me if I confuse concepts (or show lack thereof).
When constructing the power grid, I was wondering about the following:
Do engineers use 'standard lines' (with a fixed capacity per distance) or do we have a variety of lin... |
H: Is there a small (6-pin) DIP I can use to generate multi-MHz squarewave clocks with an external crystal?
I'm building a circuit that I'd like to run at 8 MHz to begin with, but I want to be able to try it out at 10, 12, 16, 20, and, maybe, 25 MHz. I know that many microcontrollers have the ability to just plug a pa... |
H: Capacitors, ground between connection, Colpitts oscillator
For the Colpitts oscillator circuit shown (from a YouTube video), the video author said that the capacitors C1 and C2 are in series, which makes sense since there is a common connection point for C1 and C2 at the bottom, while the inductor is between the o... |
H: Simple circuit, mesh method, can't resolve
I'm trying to resolve this for 3 hours now, I think I made some errors around the last part but can't figure out where.
I'm a beginner and I'm still learning.
If you want to try here is the circuit:
simulate this circuit – Schematic created using CircuitLab
I start by m... |
H: CMOS frequency of oscillation
How to find the frequency of oscillations in this circuit CMOS circuit:
simulate this circuit – Schematic created using CircuitLab
Assuming the ideal CMOS gate with the threshold at 0.5Vdd.
And the output and the input waveform if an inverter.
R = 10kΩ; C = 1nF; IC = CD4069; Vdd =... |
H: Verilog - connecting multiple bidirectional buses
I've been designing a retro computer in verilog as an exercise and so far have a simple 8-bit CPU that communicates directly with a single RAM chip via a bidirectional data port. This works great in my testing, however the need has arisen to include a second RAM on ... |
H: Weird behavior using Transistor
I am trying to switch 12V using a Transistor and an Arduino, which outputs 5V. When I connect the Arduino to the Transistor base and 12V to the collector, I get 4.2V on the Emitter, and I don't understand, why. The Transistor is a C9014. Why is the output 4.2V and not 12V, as I expec... |
H: Power green LED from microbial fuel cell (MFC)
I am looking for a way to power green LED (like GNL-3012GD) from MFC which provides 0.2mA @ 0.6V for about 1hr (there should be some drop off period then; 2..3hrs to restore). I understand that the amount of power is too small but what about the energy storage to drive... |
H: Why is the magnetic field around a bar magnet represented by iron filings?
Why would we use iron filings to display a magnetic field interaction and then teach this as the unaffected field of a magnet?
Iron affects the field itself. This is analogous to an observer affecting a quantum event through observation.
Mag... |
H: How a Computer Represents a Number Electronically
I understand how computers represent decimal numbers using binary. I have yet to absorb this video on how computers add numbers, which looks helpful.
Before understanding that though, I would like to understand at a deep level how a computer stores and represents a ... |
H: What to call the cells of memory in a computer or a microcontroller?
I don't know if this is the right forum to post this question, but I thought so because this forum is for educators and I'm a trainer and my question is related to education.
I want to do an introduction for a technical manual about basics of mic... |
H: Low power local area radio controller chipset
I have a project where I need to remotely control up to 128 individual relay boards within a maximum 30 meter radius. I need each of these wireless relay controllers to be uniquely addressable to ensure the correct relays are opened and closed.
Ideally, quiescent power ... |
H: How does glass create an electric field?
I'm reading from Microchip's data sheet regarding their MAXTouch microchip, which details on how to create a touchscreen compatible with their chip, and in discussing the "mechanical stackup" of a touchscreen it is noted that
Front panel dielectric material has a direct bea... |
H: What defines the sign of transistor rating values?
Here for example I have attached excerpts from two general purpose PNP transistor datasheets. One of them has negative values, other one positive.
I would like to understand what defines these values to be positive or negative.
P.S. Second one is for 2n3906.
AI: Th... |
H: AVR(or PIC) vs ARM for LoRaWAN nodes
Well, you can say that the title is a little bit misunderstanding. I do not want to compare these architectures, it's worthless.
I am trying to understand why an engineer could ever pick for his LoRaWAN node an ARM MCU. In my opinion, if someone trying to design a LoRaWAN gatew... |
H: Tail biting convolution encoder
I understand how encoders and decoders work, but what are theses values?
AI: Maybe this will help your understanding: -
Octal to decimal converter. |
H: Decoupling feedback for testing of PWM controller IC for SMPS
I am trying to test an SMPS controller IC (like KA3882) by isolating the controller from the PWM FET circuit and de-coupling the SMPS output (to optocoupler and the feedback pin of the controller).
By applying the required feedback voltage to the Vfb pin... |
H: bidirectional buck/boost converter vs separate buck and boost converters
I have recently leared about bidirectional buck/boost converters. They can be used in hybrid vehicles for optionally charging a 12v battery from a higher voltage battery or vice versa. How would one of these perform differently than separate b... |
H: why is the feedback or gate resistance RG necessary?
Here the large feedback resistance RG interposed between gate and drain of the NMOS (usually in the megohm range) forces the dc voltage at the gate to be equal to that at the drain (because IG = 0). Also, it says that RG works just like the RS which is to stabili... |
H: STM32F1 -bootpin resistors
The STM32F1xx "Getting Started" app note shows the BOOT0 and BOOT1 pins connected to ground/VCC via a \$10k\Omega\$ resistor, and so that's what I've always done and everything works fine.
However, now I'd need to switch the internal serial bootloader on/off depending on whether another b... |
H: Including and extra product term on same chip in a PAL implemntaion
To implement a circuit we have a PAL requirement 4-input,4-output,(2,2,2,2) product terms.We are using a chip with 8 inputs,8 outputs(4 reg, 4non reg)(2,2,2,2,2,2,2,2). But it happened that we made a calculation error earlier and now find out that ... |
H: What this NPN transistor circuit do?
I need some help to figure out what this NPN transistor circuit do, how it works and why it's needed in order to make the CSR64215 bluetooth chip work. Here's the schematic:
And here's what MFB stands for in CSR64215 chip (took it from the datasheet):
I'm asking all these que... |
H: How to replace a relay with a MOSFET?
I currently use the circuit below to power the OUT output when the signal is high (5V). I have a problem related to the size of the circuit, using a relay takes up a huge space. With this I would like to know if anyone has any idea of circuit with the same logic however using M... |
H: Confusion regarding this Op-Amp circuit
So I have started learning about Operational Amplifiers. In case of idea Op-Amps,
Vd=0 as amplification is very large and Vo is limited by Vcc(the supply voltage).
Here in this inverting Op-Amp configuration ,
Vout= - (Rf/Rin) * Vin which I understand perfectly.
But I have 2 ... |
H: What USB-2 cabling hardware do I need to connect two Windows 10 computers together?
I want to run a .NET app in each of the two computers, so that they send and receive data through USB-2.
What kind of cable adapter will do this?
BACKGROUND:
I need to build a GUI on Windows that communicates through USB-2 with an e... |
H: How to measure switch bounce on a CRO?
I want to measure switch bounce, but all I have is access to an old CRO. Based on inputs from this forum post, I tried the HOLDOFF knobs and other buttons too. Nothing worked. In the case of modern DSO's people have suggested using the trigger and I think that may be of use he... |
H: What is the proper way to dim LED pods?
I am trying to properly wire and then dim Cree LED tri-pods (3 LEDs on a disk).
The spec sheet appears to read that the way to connect 2 * tri-LED pods (6 individual LEDs in total) would be in series, incremented at 2.6v per pod (maybe LED). It is not clear about the pods at ... |
H: BJT Constant Current, Resistor Equations
I am looking to design a simple constant current circuit to draw a precise load from a variable voltage rail. The voltage rail (V+) should be 10V-20V in normal conditions, but it is possible for V+ to be floating. The control signal (CTRL) is to be driven from an MCU on 5V... |
H: LF356 integrator simulation using LTspice
I used the LTpsice to simulate the feedback performance of a integrator circuit with op amp LF356 which is a JFET input op amp but I go strange results (see the image below). The model of the LF356 was the Pspice model downloaded from the TI website (http://www.ti.com/prod... |
H: Symmetric vs Asymmetric PWM
I am working on Control of Power Converters, I was reading TI's piccolo DSP ePWM guide and came across symmetric vs asymmetric PWM, I have a good basic understanding about converters, DSP and all.
My question : According to ti's note http://www.ti.com/lit/an/spra278/spra278.pdf [page 10... |
H: Why does the MRI machine does not rip off its own electronic components
Maybe it's a lame question but it came up to my mind recently.
Usually, Electronic equipment or metallic materials are forbidden in MRI rooms. Also, there are no electric sockets present in that room. How is the machine designed so that it does... |
H: Astable multivibrator diode improvement
The output voltage of an astable multivibrator is not a perfect square wave; the voltage when viewed from an oscilloscope tends to resemble a curve. I'm told that this is because the voltage across the capacitors cannot change immediately and therefore the R1 capacitor curre... |
H: Measurement of total AC resistance (including radiation resistance) of a coil using LCR meter
If we measure AC resistance of a coil using an LCR meter (or impedance analyser), does it include both ohmic resistance and radiation resistance? I understand that the radiation resistance is negligibly small for coil at l... |
H: Capacitor allowing DC through? LM833N
sorry for spamming about questions today, but I am riddled here.
SOMEHOW there's 2.2V at the output is that even possible?!
LM833N Datasheet
simulate this circuit – Schematic created using CircuitLab
AI: If it's really 1 mF ( 1000 uF) it's an electrolytic capacitor, which WILL... |
H: Connecting Difference Amplifier to High Impedence Sensor
I have a high impedance differential sensor (stable 600k impedance Rth, 10mV signal, Fout=1kHz). I need to amplify this signal to about 1V (40dB gain). Due to layout/system constraints only the TLV9061 OpAmp stage can be used. Any suggestions on what topology... |
H: Controlling 1000W LED strips with Arduino using PWM and MOSFETs
I'm doing a large photostudio automated lighting setup and I'll need a lot of light so it will be 1000W of LED strips and I need them to be controlled by Arduino.
The strips are gonna be on about 20% of power most of the time and then for a photo captu... |
H: What can be said about the nature of the noise by looking at this spectrum?
I use some industrial amplifier modules where each of them amplifies force transducers. All amplifiers are powered by a single power supply and the output.
Amplifier is set to 6kHz filter. And there is no anti-aliasing filter in the system.... |
H: What is this component called (Plastic housing with screws for connecting wires)?
This is part of a PIR sensor circuit. The component in question is the black array where wires can be fastened. I tried searching the web, but for lack of any tangible keywords, I came up empty handed.
AI: That's a screw terminal bloc... |
H: Analog Blackfin Processor Silicon Revision issue
Recently we got a large batch of ADSP-BF5346s that say they are Silicon Rev 3 but internally read as Rev 2. Is there a way for me to determine the Silicon Revision number on the rest of the shipment without soldering all of them? I'm thinking a bootloader/JTAG but do... |
H: BJT vs FET for VHF LC oscillator
In the ARRL (2011) section 9.3.1 about LC oscillator circuits it says that "[t]he N-channel JFET source follower shown appears to be the most popular choice nowadays", but does not explain the advantages of JFETs over BJTs.
All I can think of is the fact that BJTs need extra compone... |
H: In Charging Circuit with battery detection
The circuit is charging the battery with Vcharge and VCharge also power up the circuit operation. Battery will serve to power the circuit when main power supply VCharge cut off.
A switch is added to connect battery to the circuit with led indicator.
simulate this circui... |
H: I don't understand the windings inside my power drill.
I was curious about how my power drill worked and I disassembled it. I understand the general principles at work here but I don't understand why the winding is set up this way.
I assume running current through the solenoid in the center induces a magnetic fie... |
H: Why carriers move when Electric field is applied on Haynes-Shockley experiment
I would like to know why excess carriers/minority move when an electric field is applied at the Haynes-Shockley expirement
AI: This is because charge in field feels force equal to field times charge. Coulomb law. The interesting question... |
H: Q: Digital potentiometer MCP4162
I am having a hard time understanding the MCP4162 Datasheet.
The application for the digi pot is have an Ardunio to control the wiper resistance so I can have a constant desired output voltage regardless of input signal. So depending on the input signal the digipot will find the id... |
H: Proper power supply for this gate driver IC
I will use the gate driver configuration shown below:
Gate Driver datasheet
MOSFET Datasheet
As you can see, the 5V and 12V are isolated. I chose this AC/DC converter for the 5V supply. It's 1 Output 5V/3A. It will supply a STM32 and a Raspberry Pi.
I decided to step up ... |
H: Why would it be bad practice to limit current with just a resistor?
I am sure I am incorrect, but nobody can tell me why I am incorrect.
I have some LEDs that require 1amp. My DC source 52v @ 2.6amp DC power source (constant current technology)
A proper solution is not easy without careful engineering. All ICs on... |
H: What does it mean when a capacitor and it's connectors are marked with a red marker?
Is there some kind of convention in electrical component maintenance that would explain a red marking on a capacitor?
I found this in my Pioneer SA 5300 audio amplifier and wondered if this carried some special meaning.
AI: Most l... |
H: Portable high lumens array
I am trying to build a portable light source - running (exclusively) on a 12v electrical bike battery. Have it operate approx 1 hour on a charge and produce the maximum possible lumens.
What would be the best approach Led and driver wise? (Strip/die?) A bit lost trying to calculate what c... |
H: Data memory usage reported by AtmelStudio for ATtiny85
I am using AtmelStudio to program an ATtiny85, which has 512 bytes of SRAM data memory.
My code includes a large lookup-table (array) which is 512 bytes:
const uint16_t lut[256] = { ... };
The project has no other global or static data, so when I compile it, A... |
H: How to get more torque using a Stepper motor
I am using a stepper motor with a belt. The system has more friction due to the belt. So, I need to increase the torque of the motor at rotating.
I am currently using 57HS09 motor and M542
It has microstepping setting as 1000PPR and full current(4.0A) is given.
Pulse gen... |
H: Step-up converter with Vin, Vout, GND
I want to use pololu step-up converter https://www.pololu.com/product/2836
in order to power a 5V device with two Ni-Mh batteries (1.3V each). It has only Vin, Vout and GND connectors. I've checked with voltmeter the batteries together and they give stable 2.6V, which should ... |
H: How to align components for front panels
I am struggling with the front panel setup. I need to align 3 types of components: push-buttons, potentimeters and 5mm leds.
The potentiometers have a nut to fasten it to the front-panel, for the leds I have small plastic mounting rings. The push buttons would need to go on... |
H: Use single GPIO out to reset multiple lines
I want to use a single Raspberry Pi GPIO out to reset two lines: LCD and CTP. What would be a correct schematic ? Can I simply connect both lines together ?
Both devices are "no-name", i.e. no schematic available.
LCD IC is HX8379A, CTP is FT6236.
AI: Yes, they are both... |
H: Solid state relay voltage current rating
I am looking to use a solid state relay like this one . This relay has a peak load voltage of 350v and continuous dc current rating of 110mA.
My question - if I wanted to control 12v @ 1A DC through this SSR, will it be able to handle it?
350v @ 110mA = 38.5W and 12v @ 1A = ... |
H: Embed Component into LTSpice
I have downloaded the Spice file for the TLV9062 here. I have now created a custom symbol LTV9062 that lives in my AutoGenerated folder and links to the TLV9062.cir file for the Spice model.
When I make a schematic it runs fine on the original machine but won't work on any other compute... |
H: SPICE issue: keeping subcircuits independent of eachother
TLDR I want to make circuits that are connected but independent in Spice.
I am using the Xic graphical editor for WRspice, but I think that this issue isn't specific to the type of Spice being used. What I want to do is this: send an input into my subcircuit... |
H: AS6C62256A SRAM Usage
I'm in the process of creating a RAM module for a breadboard computer I'm making. The RAM I've decided to use is the AS6C62256A SRAM chip, in 32K x 8. Here's the datasheet: https://www.alliancememory.com/wp-content/uploads/pdf/AS6C62256A.pdf. I'm quite new to this field, and don't have much of... |
H: Producing energy from lighting bolts
An average bolt of negative lightning carries a current of 30 to 50 kiloamperes, transfers a charge of 5 coulombs, and dissipates 500 megajoules of energy (120 kg TNT equivalent, or enough to light a 100-watt light bulb for approximately 2 months). However, an average bolt of po... |
H: Question about Multi-Tap Transformer
So I have this multi-tap transformer as a project. I bought the transformer, the only thing I did is the connections and the casing. When I tried to connect a 12v DC motor, the motor will vibrate like it is spinning but the rod/tip of the motor is not. Sometimes it spins clockwi... |
H: Can you determine needed input voltage from just looking at this circuitboard?
Question poster's level of knowledge: BEGINNER/NOVICE/MENTALLY CHALLENGED
Device:
A stage lighting pan/tilt motor, for one axis. Used in sets of two to provide remotely controlled X and Y movement of a spotlight.
Function:
It has been ... |
H: What does a double arrow mean on a schematic?
In this schematic, what might the double arrows at M5 and M4 represent?
This is in the power supply for a 1980's CRT monitor, if that narrows it down any.
AI: Another example
Inline connector as seen in the image.
Ref. 1: http://nolanwebdev.com/6323/qM6f-6350/
I will ... |
H: Yet Another question on using GPIO to short a remote push button
OK, I bought this little remote-controlled Ac outlet thing for $1. It controls 3 outlets via RF. I didn't realize it was RF at first, but I currently have my BeagleBone Black doing a bunch of home automation stuff on my network anyway, and figure I ... |
H: Ion-selective electrode: high input impedance to measure the voltage
I read that an ion-selective electrode has an high impedance (\$100 \, M\Omega\$) and that it's necessary a high input impedance to measure the electrode voltage.
I'd like to understand the above sentence with a circuit. I tried to draw a circuit ... |
H: Charging and Using a Lithium Battery
I’m using an Adafruit micro-USB Charger connected to a standard 850mAh LiPo battery. I would like to know if it’s safe to charge the battery while also using it. The circuit that the BATT and GND pins are connected to will draw about 60-150mA. The charge current is 500mA.
From w... |
H: What's the minimum amount of transistors I need to operate a stepper motor?
I would like to know the minimum amount of transistors to operate a stepper motor.Could I pilote it with one transistor or I need one transistor for every coil?
Thanks in advance!
Edit: the minimum number N of transistors I should connect t... |
H: Fuses - Are there any voltage conversion for the break-off
Anyone knows the very common glass fuses in electronics etc. But I am uncertaion about the breaking conditions.
Example: A fuse rated as 5A/250V, it is the breaking point. But I have seen such used in devices with a much lower voltage, like 12V or 24V.
The ... |
H: PCB contacts for membrane keyboard looks corroded?
One of the keys on my Rigol DS1054Z oscilloscope wasn’t working. I opened up the scope and this is what I found. Is that K5 pad corroded? Other than sanding it is there any other way to restore functionality? I tried cleaning it with IPA and then Acetone but that d... |
H: Why isn't the BIOS' ROM chip made using CMOS technology?
After reading a computer hardware course on BIOS/CMOS, I'm still unable to determine the reason why the BIOS' ROM chip isn't built using CMOS technology, and why it is connected to a separate chip called "CMOS" for storing the configuration information.
This ... |
H: What is the purpose of a disconnectable wire in this power supply?
In this circuit, there is a wire between M5-1 and M5-3 (at the bottom). It's a little plastic connector with a wire in it that you can pull out.
I've been trying to debug a power issue after recapping this 1980's power supply. At first, I forgot to ... |
H: 1.54 e-ink without driver PCB
I want to know if it is possible to use this raw e-ink display with Arduino. Is it possible to directly connect cables from this ribbon cable to Arduino without any driver PCB and control it with 3 or 4 wire SPI? I was looking for some tutorials but I haven't found anything. In the fu... |
H: RF transformer design for a capacitance variation sensor
So I`m trying to design a variable capacitance vibration sensor and the best implementation I came up with is a capacitance-to-phase converter.
I used:
a PIC16F15323 NCO peripheral to control the input frequency to compensate for large stray capacitances
a s... |
H: I can't flash my new ATMega328p with PL2303 USB-TTL converter
I've soldered my ATMega328p-au to a SMD to DIP board, and I've connected pins like this:
USB | ATMega
RX ---> TX
TX ---> RX
5v ----> 5v
GND -> GND
and GND --> button --> RESET
My USB-TTL converter doesn't have a DTR pin. But, I tried programming my Ardu... |
H: What kind of setup can take portable solar USB power & charge a AA battery charger that is usually designed to plug into a wall?
I have a portable solar panel that generates 21w of power, seen here: enter link description here . It has a USB connection wired into it that will accept a USB cord to charge small devic... |
H: 1v for non-inverting op-amp input
I need to reduce 5v to 1v for use as a reference voltage in an op-amp.
What would be the best way to do this? The simplest solution to me is to use a voltage divider, although I understand others have reservations about this.
Alternatively, a voltage regulator of sorts, although a ... |
H: Hidden pins in CD4000.lib with LTspice
While working with the CD4000.lib in LTSpiceIV I came across the following:
A capacitor was discharged via a CMOS Schmitt trigger input. Analysis of this behavior revealed that LTSpice may not handle hidden pins correctly.
See for yourself:
The first case was the one where I n... |
H: Tiny Magnet Sensor Switch
I know just enough about electronics to do the occasional Arduino or Raspberry Pi project, as long as I don't have to understand too much of what's going on. I am a software guy who dabbles in hardware a tiny bit. So, I'm not even sure I can form a good question, which is why I haven't bee... |
H: what is this component and the brand name ? P527 DGM
Im studying this board's circuit. But cannot find what's this P527 DGM component is. Could anyone tell me? Thanks
AI: It is a TVS diode from the Chinese company BrightKing. It appears to be a clone of the Littlefuse SMDJ64CA. The picture below shows a clip fro... |
H: What effect would a hydrogen bomb detonated at high enough altitude have on the power grid and solid state electronics?
After reading several dozen reports on EMP effects of nuclear explosions and viewing archived government footage of nuclear weapons testing I have come up empty handed.
As for example let us ass... |
H: Schematic Critique - ATMEGA328P & VS1063
My knowledge in PCB design is very limited, so I've been trying to learn as much as I can on my own. Some feedback on my first design would be incredibly helpful!
Description
ATMEGA328P "A" is supposed to receive serial commands via USB, output RGB LED data through the two L... |
H: How to make a circuit to trigger a relay once the cell voltage reaches 83.5V DC
I need to make a circuit that will trigger a normally closed relay to cut a signal.
I have a 12V power supply DC
I need it to trigger once the main system reaches 83.5V DC
Needs to be powered by the 12V DC system.
EDIT: Thank for all th... |
H: What is torque-ampere ratio at electric machines? How it is related with machine efficiency?
When I am reading a journal about SRM (switched reluctance machines) it said that outer rotor design has better efficiency due to higher torque ampere ratio. How it is related with efficiency?
AI: Torque / amperage ratio me... |
H: What current should be used to calculated the drop across the diode? RMS current or average current?
I was designing a power supply, following is the output bridge diode current waveform from LTSpice simulation .
My intention is to calculate the power drop across the diode. What value of current (RMS value or avera... |
H: Detecting velocity in a specific threshold
I have three velocity sensors that are axis in 3D.
I would like to know the best method to do basic ON/OFF trigger..
I'm thinking of a hystersis control, is there a method that can detect if the velocity from all the three sensors exceed a specific range like 10 m/s?
AI: ... |
H: Opamp DC offset Question
Just need some help understanding what's happening in removing the DC offset from two band-pass filters.
VG has a value of 4.5V. When I added in the virtual ground the circuit had an offset of 4.5V at the Out and Out2 nodes. I added in capacitors C7 and C8 at 1\$\mu\$F understanding that i... |
H: Display Driver for a SHARP LS020B1DD01D LCD
I am working on a personal project that will feature an LCD panel and push buttons to control the graphical user interface. For the LCD I would like to use the SHARP LS020B1DD01D (for the specifications, see http://www.panelook.com/LS020B1DD01D_SHARP_2.0_LCM_parameter_208... |
H: DC-DC converter in "parallel"
I'm designing a system that needs two converters. The Vin input voltage is approximately 14.5V. I need to lower the Vin voltage to 12V and also to 5V. I chose two LM2576-5 (5V) and LM2596-12 (12V) converters, the two converters require a 100uF Cin capacitor. I put a 100uF Cin capacitor... |
H: Help with P-channel mosfets
i am trying to get my head around p channel mosfets and bought some A03401 mosfets. As i understand the mosfet will not allow current to flow if Vgs == Vds and thats why the pull up resistor is there. I have not even attempted to connect a microcontroller yet because the led was on in th... |
H: Connecting Temperature sensor EVAL board (ADT7516) to the BeagleBone Green
I have a BeagleBone Green
and an evaluation board of the temp sensor (ADT7516).
I also have a 4-pin female jumper to grove 4 pin conversion cable.
I am not an electronics student and have no idea how to make the connection.
I would like to... |
H: Designing a circuit for active low input relay
How do i modify the following circuit for a 1 form A contact relay such that it has active low input.
AI: simulate this circuit – Schematic created using CircuitLab
You could add an NPN and resistor like this. It will invert the behavior. The output will be high if ... |
H: What is the recommended battery chemistry for digital multimeters?
I would like to know if the different internal resistances of different battery chemistry somehow affects the calibration of a digital multi-meter.
If so, then what would the optimal battery chemistry be for commercially available multimeters.
For ... |
H: How can I solve this circuit with voltage and current sources using the node voltage method?
Here is the circuit.
simulate this circuit – Schematic created using CircuitLab
What do I have to do when there are two different sources?
Find all the voltages in the resistors.
Supposing every current going out of the no... |
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