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7 views

How to determine time needed to stay in a voltage vector state in Space Vector PWM for 3 phase inverter?

I need some clarifications on how and when to switch between voltage vector states (for the sake of discussion lets take V1 and V2 in the image below). Below is the image of 6 possible voltage vector ...
0
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0answers
7 views

Calculating flashovers on hv systems

How can I calculate if there will be a flash over between a 25kv catenary and a steel bridge above the railway electrical structure?
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0answers
14 views

How to Size Line Reactors and Understanding Reactor Specifications

I've got a 600 VAC, 75 HP VFD that I want to place line and load reactors in series with. Usually, I find charts like this that give me a horsepower table to follow as they are the easiest to use. ...
0
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0answers
10 views

SWD Can't Connect to Target EFR32MG13

I am trying to program an EFR32MG13P. I was successful one time; however, since then I have received another identical PCB and now cannot program it. I am using a JLink with SWD and for some reason ...
1
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1answer
31 views

Edge-lit LED panel best materials?

I'm trying to replicate the effect of this LED panel I found at Home Depot with a different set of LEDs and use a differently sized panel. It's basically just a diffused light that mimics a window or ...
0
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0answers
24 views

IGBT confusion with determining Ic

For this IGBT I-V curve say I have a Vge of 10V and no biasing resistor on the collector with 5 Volts being supplied by some supply providing up to x watts. According to this I-V curve this should be ...
0
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1answer
37 views

If I used an everyday 9v alkaline battery to power a 6v DC motor, would it work? [duplicate]

I am totally new to electronics and don't know much but am trying to create a project that uses a 29rpm 6v DC motor. I was wondering if I were to use a higher voltage battery ( a 9v battery) would it ...
1
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3answers
60 views

The relationship between power, heat and efficiency

I've been thinking about this conundrum. Given we use joules to move a metal block over a surface, we do work. So imagine a motor, that spins and pulls a string, moving said metal block over one ...
0
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0answers
30 views

Suggestions Sought for a High Power, Low-Ripple Negative Power Supply [on hold]

I have an old spectrometer that requires +-12V and +-5V power sources. I have everything but the -5V, 1A. So I am thinking of using one of those +12V or +5V to generate the -5V. The modules I found ...
1
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0answers
27 views

Applying a 1/3 bias to an LCD display spec'd at 1/2 still safe?

We're currently using an MSP430 with an integrated LCD controller that only has a 1/3 bias mode. The LCD display has a 2-mux configuration and the data sheet specifies "drive method: 1/2 duty, 1/2 ...
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3answers
81 views

Why does LT spice limits frequency domain output to 65535 data points?

Background: I ran a simulation and I am generating the S21 gain of a circuit I am working with dembedding and wanted a 100% accurate and wanted a ridiculous amount of data points and when checking my ...
0
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3answers
67 views

How can I determine if this computer fan is dead?

Desktop computer fan started making noise then stopped. We noticed it requires 12V and will run at 200mA. I wasn't sure about that at first. Does that mean it has an internal resistance of : 12V / ...
1
vote
1answer
31 views

Testing spice model for common mode rejection ratio?

I've been trying to create a circuit to simulate common mode rejection ratio of an op amp to test the spice model's accuracy. While I've seen online that being able to use exact resistors only a ...
0
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1answer
33 views

Building a formula to pass n bits though the minimum number of circuts

I have a circuit X which has 4 inputs A0,B0,A1,B1 and 2 ...
0
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0answers
67 views

how can i relearn electronics again [on hold]

i don't know if i can post this question here (if not please let me know where i can post it ). i have 3 or 4 mouths of summer break and i ...
-2
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0answers
29 views

Power bank port detection [on hold]

I bought some power banks, I took all the pieces apart in order to set them in a most resistance case, the matter is than before I opened the original case it was powering my arduino at the moment I ...
0
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0answers
33 views

Low power RF switch [on hold]

Sorry about my noobie question but here it goes: I am trying to control the rainbird 9V latching solenoid valves on my garden with arduino and esp8266 but the catch is, there is no electricity where I ...
-1
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0answers
49 views

Power Supply of a VCR [on hold]

My VCR was not working, I wanted to restore it. I don't have enough knowledge about circuit components. Can you tell what it that white round colour thing in the picture?
2
votes
1answer
96 views

What component is labeled “SI” on a PCB silkscreen?

What component is labeled SI (SI1, SI2, etc) on a PCB? By the way, what kind of capacitor is C7? (The one on the right of the "SI" component, assuming its a capacitor). EDIT: The PCB is a combined ...
0
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2answers
28 views

Looking for Connection Ideas for 12V Battery Pack

I'm working on a project that's requiring the use of a battery pack made from 18650s. 3 of them in series connected to a BMS. It's a 12V supply that is housed in a 3D printed part, length wise of the ...
0
votes
1answer
51 views

Am i applying the KCL the right way?

Applying KCl at the node where I have drawn the currents in order to find Vin/Vs, I am not getting the correct answer which however I did obtain using the Voltage Divider. My question is, am I using ...
2
votes
1answer
29 views

Presence of Crossover Distortion in Class A Amplifier

This question is about theory facts of class A audio amplifier. It is known that class A amplifier is usually biased so that an amplifier's quiescent point is in the middle of the amplifying device's ...
1
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2answers
27 views

How is Gyro drift error related to error in velocity and position?

While reading about IMU on wikipedia I found this about its disadvantages: "A constant error in attitude rate (gyro) results in a quadratic error in velocity and a cubic error growth in position." ...
0
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0answers
18 views

Simulating a specific LED on Eagle through NgSpice

I was trying to simulate a current mirror circuit for a parallel set of LEDs in a project that I am undertaking. However, before actually working with real parts, I wanted to simulate the circuit in ...
0
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0answers
39 views

Reading rising edge on 8 GPIO pins by events on STM32f103 [on hold]

I like to monitor 8 digital inputs, and measure the frequency of their input signal in 128ms period, the signal coming to the inputs is square wave with a duty cycle of one percent and between 300 to ...
0
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2answers
99 views

Would this protection and limiting circuitry work with 5.1V zener diode?

I have a small project for part of an experiment where a PWM controlled DC fan speed will be controlled by a -10/+10V function generator's analog DC output. So basically the chain will be: Analog ...
3
votes
0answers
34 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
0
votes
1answer
62 views

LM317 with potentiometer [on hold]

According to above equation doesn't output voltage depend on input voltage? I have made this regulator circuit but it can't increase output voltage than the input voltage. So can't we increase ...
0
votes
1answer
36 views

Op-Amp - Sharing Non-Inverting Inputs in a two stage amplifier

I've mocked up a simple circuit using a TL064A to reduce the single level of a single ended input audio source. I'm using two stages per channel, and both stages on each channel are sharing a ...
-1
votes
0answers
39 views

1 Hz 555 timer voltage trigger [on hold]

I have a simple 555 timer circuit producing an 1 Hz output at notionally 5 V in/out using 2 CR2032. I want to increase the voltage output to 9 V. Would it be better to use a 9V battery to both power ...
2
votes
1answer
23 views

esp32 driving zener diode with 2.9v threshold at the gpio

If I want to drive the Zener diode with the ESP32 GPIO, will that be appropriate? What factors to look in this case? I want this as a low voltage detector?
0
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0answers
20 views

bluetooth 5 interference from other phones interrupts audio (a2dp and hfp)

(I tried to find the best forum to ask this, here seems the best place; please recommend alternative before downvoting) Problem: while listening to music over bluetooth A2DP profile from a gps (zumo ...
0
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0answers
73 views

Burned Up Trace on Input Cap

I'm working on a fairly simple PCB that interconnects three arduinos. There are also MOSFETs for switching some solenoids. The system runs off of a 24V DC power supply. I was running a LM7812 voltage ...
-2
votes
2answers
43 views

Interruptions in code or circuit due to 5v and gnd pin in arduino

I am making an automatic temp controller using max6675 thermocouple sensor and a buck converter.They are connected to arduino. For generation of 10Khz pwm signal for buck i am using Timerone.h library....
1
vote
1answer
36 views

Intel FPGA: applying timing constraints

I have a data signal, select and clock signal which I am sending from the FPGA to another chip and I need to constrain them so I don't violate setup/hold time etc. I have tried to write and SDC file, ...
0
votes
1answer
26 views

How to infer the max current output of this function generator from its datasheet/specs?

I need to figure out the max current a function generator can output from its signal waveform output. Here is its datasheet. But there is no such parameter here. The output voltage can swing from -...
0
votes
1answer
33 views

Correct wiring of Cortex-M 10-pin Debug Connector

The ARM Cortex-M 10-pin debug connector has five interesting signals, in the original PDF they're named: SWDIO / TMS SWDCLK / TCK SWO / TDO NC / TDI nRESET For MCUs which only support SWD and which ...
1
vote
2answers
67 views

What data is typically stored on RFID cards and why?

I understand that all RFID cards contain a UID in their memory from manufacture, normally in sector 0. But they also have additional sectors for data storage, my question is what is some example data ...
2
votes
1answer
37 views

Circuit to turn microcontroller on when reed switch state changes (to monitor door lock state)

I'd like to build a circuit that provides power to a microcontroller (ESP8266 in this instance) when a reed switch is changed from closed to open AND when changed from open to closed. This is to be ...
-2
votes
0answers
33 views

Help me to fix 12V 1A SMPS power supply [on hold]

I am new to electronics. I am trying to build an SMPS power supply - output 12V 1A. I got the reference design from online. The DC output from the flyback transformer is 30V+ but I am trying to ...
0
votes
1answer
43 views

What are the additional transistors used for in this hex inverter?

I'm learning about electronics and was studying the SN7404 hex inverter schematic when I saw this: I naively expected just a single transistor (the one in the bottom right) and the input at the base ...
0
votes
0answers
31 views

How to drive +-10V Gate-Source N-MOSFET from 30 V

I have N-MOSFET with maximum +-10V Gate-Source voltage and I need to drive it with 30V signal. Is voltage divider way to go?
0
votes
1answer
25 views

Electronic Circuit with Opamp and Transistor to pull down a reference voltage via a diode. (Voltage Limiting)

I have a circuit which I have designed to pull down a voltage via sinking current into the opamp output. When the source signal is of higher output impedance this works fine, but when the source ...
0
votes
0answers
21 views

Integrating two microUSB receptacles to a device (for power, no data) but only use one as power source [duplicate]

I am making an IoT LED clock device using an ESP32 to drive LED strips that illuminate time. The whole device is powered by USB (it has a microUB receptacle) and it can draw a maximum of 3A on 5V. ...
1
vote
4answers
71 views

Do smaller transistors improve computational efficiency because they decrease the duration of signal transfer?

There has been a massive improvement of computational power of computers per $ over time. As far as I understand, this has been driven almost completely by the massive increase in transistors per ...
1
vote
1answer
56 views

What is an impedance bridge?

Today, I saw a very old historical piece of lab equipment at the university. It had a large number of dials, although not as large as you would see in an oscilloscope. The size was similar to an ...
-1
votes
1answer
29 views

Find ROM and RAM in .bin file for micro controller

I use the Arduino IDE to compile some code to a 32-bit ARM Cortex-M3 based microcontroller. The result of the compilation is <...
0
votes
3answers
72 views

What is this small circuit board used for in a 12v light?

Repairing a home-made disco light that was used in a nightclub during the 80's/90's and it consisted of 16 12v 50w lamps arranged on 8 legs. I have discovered a small circuit board within each lamp ...
0
votes
2answers
26 views

ECG for fluorescent lamp and grounding

I have three OSRAM Quicktronic DIM T8 1x 18W in the same room. One is near the wall outlet, the other two are each about 10 m away. Each one is very close to the respective T8 tube. While the first ...
-1
votes
1answer
45 views

Is there a way to power a computer stick from my phone with OTG? [on hold]

I need a compute stick like the Intel compute stick with me on the go. The way I will access it is just by doing SSH. I need a way to power it up, either by power bank or by my own phone via OTG, ...

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