All Questions

1
vote
1answer
31 views

Infinite While loop in Vivado

Here is what I am exactly working on: I have to run an infinite while loop and check the output on oscilloscope. As I change the processor frequency, I will get a ...
4
votes
1answer
35 views
+100

Phasing Order in IEC Color Codes

Currently, IEC 60445 international standard is used for conductor terminal color identifications. I've obtained different versions of the standard (2017 being the latest) and also IEC 60446, which was ...
0
votes
0answers
5 views

Calculate 100mAH battery with active and inactive value

A battery-powered remote wireless sensor uses 10 mA when active, 10 uA when inactive. How long will it run on a 100 mAH battery when it is: active for 10 seconds once per hour active for 10 seconds ...
0
votes
1answer
31 views

simple six-position voting machine into a 7 position voting machine

I'm new to learning about full and half adders and what not. but I am struggling to understand this question out of my study manual. The pictures shows a simple six-position voting machine module ...
3
votes
1answer
272 views

Why do some PCB antennas have a return path to ground?

I'm finding it hard to find an answer for the question, as I'm asking about the circuit's GND, where searching for an answer online or in stack-exchange is coming up with Earth GND for large Antennas ...
0
votes
2answers
14 views

Is there a difference between rise and fall time and modulation frequency

I was wondering if there was a difference between modulation frequency and rise and fall times of a laser diode or LED? If a laser had a modulation frequency of 100MHz would that be the same as a rise ...
-1
votes
4answers
68 views

How many Electrons make a bit?

A bit, correct me if i'm wrong, is a digital signal which can be 0 or 1. To determine its value, a processor awaits an X amount of time. My question is: is there any way to determine how many ...
1
vote
2answers
82 views

Is this IR LED driver circuit with a transistor OK?

I am making a custom IR array board with a custom Arduino (only ATMEGA328 and necessary components.) So please tell me will this be fine or if I need to make some changes. IR LED = 940nm, continuous ...
-2
votes
1answer
2k views

Code on SMD component with only ADJF [closed]

I need to know what the part number is for a 6 pin SMD component. The code on the case is ADJF. Please let me know if anyone has a datasheet or information for this device. The circuit board is an ...
0
votes
1answer
15 views

How to make a power supply cable for a 10.5V 4.3A laptop OR how much higher voltage can I use

Let me preface this by saying I've spent countless hours researching and learning what I can about electronics before asking this, and I cannot find a clear answer to this. So sorry if this seems like ...
0
votes
4answers
98 views

What kind of sensor that can detect prolonged contact?

i'm currently working on project that needs an implementation of certain touch/force-presence sensor on human body surface. I want to place the sensor on my backpack shoulder straps, so that the ...
1
vote
4answers
86 views

int functions with no return statement

In a course I am taking on embedded systems, I program LPC1768s which are based on ARM using C. The main functions are always of int return type. However, there ...
-2
votes
0answers
30 views

Resistors in Arduino kit

I want to run my power supply using 10-ohm resistor but I don't have a 10-ohm resistor in my Arduino kit, I am wondering if that is possible to use 100 ohm?
5
votes
3answers
723 views

Is using the CH340G on a commercial product a horrible idea?

I'm developing a niche product that will be produced at a fairly low volume (low hundreds). I'm using an Atmega uC, and one of the requirements is the ability to be field-flashable by the user. My ...
2
votes
2answers
122 views

voltage traces across pwm driven dc-motor: is that ok?

I'm driving a dc-motor with a BJT turned on and off with a 555 generated PWM signal. Here's the circuit (V1, Rl and L1 simulate the motor): There actual circuit - same parts - is on a breadboard and ...
0
votes
1answer
23 views

Soldering back the disconnected wires from the charger board [on hold]

The attached link images are the front and back photo of the board inside my charger. This charger is used to charger my son's toy car. Unfortunately, the wire soldered on this chip got disconnected. ...
1
vote
2answers
18 views

Glitch in ac sinewave interfering with phase cut dimming

My company installs zigbee based phase cut dimmers for bulbs and LEDs (those which support phase cut dimming). Recently, we encountered a site where we faced a flicker issue. The light is slightly ...
1
vote
1answer
18 views

single or multiple interrupt handlers in stm32

I am coming from 8-bit world to 32-bit world specifically stm32f103. At present I am only doing study and discussion with my fellows to know the major differences in the two worlds and also to select ...
0
votes
1answer
37 views

Why are there air(?) bubbles within my LCD?

Photos: https://photos.app.goo.gl/BvqLVYkMBB7RjaMU7 (Nexus 9 Android tablet) My daughter's tablet is enclosed in a full-body case, so it's fairly well protected. Still, somehow, at some point I ...
0
votes
2answers
34 views

LM741: voltage comparator Issue

I'm working on an automatic battery charging source switching between solar power and a 24Vdc wall adapter.I'm using a LM741 as voltage comparator and a relay for power switching. Basically, if solar ...
0
votes
0answers
7 views

avoid synthesizing priority encoder for onehot to binary conversion module

For https://github.com/jbush001/NyuziProcessor/blob/master/hardware/core/oh_to_idx.sv#L40 , why use OR operation to avoid synthesizing priority encoder ? if DIRECTION != "LSB0" and NUM_SIGNALS isn'...
3
votes
3answers
463 views

Ethernet ground multilayer pcb

I'm currently re-designing a 12-layer pcb. The only thing I am still struggling with is the routing of the ethernet. The layer stackup is as follows: Top Layer GND_1 MidLayer_1 PWR_1 MidLayer_2 ...
0
votes
2answers
190 views

Timing the change mode (Read/Write) on SD card

I'm currently working on a device which connects a SD card to a FPGA. I have to find out how much time the SD card takes to switch between the reading and writing modes. I have already searched the ...
0
votes
0answers
25 views

How does DSOs estimate annual PV production

my question is how Distribution System Operators(DSOs) of a country/region estimate how much PV production is obtained from Households? I am not sure if they collect this data from smart meters, or if ...
0
votes
0answers
12 views

Max count error Touch Key stm32

i am struggling with stm32l053c8t6 microcontroller and testing touch/proximity in regard of size and shape of the electrodes. I am using discovery 32l053c8 board. It has implemented support of ...
1
vote
0answers
22 views

High side mosfet-driver circuit configuration for current bypass

I'm designing a current bypass bms and having trouble switch mosfets between calls When i connect the high side gate drivers and simulate with Proteus the overall voltage appears at the topmost cell ...
0
votes
1answer
29 views

Is a PD controller necessary if VBUS is always >5V?

I'm trying to implement a board that will use USB-C Power Delivery. We want to operate with 20V 5A input. If we know the source will always be at 20V, is it necessary to put a PD controller on the ...
14
votes
3answers
2k views

Is this resistor leaking? If so, is it a concern?

I found this resistor on the control board of an old Whirpool washing machine: Is that fluid leaking from the resistor? (Why would that happen?) Could it be something like stray epoxy or a chemical ...
0
votes
1answer
26 views

STM32 RTC with HAL libraries

I am working on stm32l053 (nucleo 64) and I want to track time with integrated RTC. Since I am quite new to stm32 development I am using CubeMX and HAL libraries. My problem is that the time is not ...
1
vote
2answers
44 views

uncertainty estimation for a DMM voltage measurement

My DMM has a accuracy of 0.0030% of reading + 0.0030% of range, when the voltage range is set to 100mV. If a measurement with this DMM gives 0.1mV, then is the true input voltage between 0.1mV - 3....
1
vote
1answer
130 views

Not getting 2.5A or 2 A DC current

simulate this circuit – Schematic created using CircuitLab I checking the output of the circuit's current by attaching multimeter(ON 10 A) in series with a load of 3 Ohms resistor. But I am ...
0
votes
1answer
270 views

IGBT contactor design

I found this circuit in an older post. I was thinking about using this in place of a contactor to break under load. The load would be at 500V 300A DC. There would be overcurrent protection in line ...
1
vote
1answer
36 views

safety precautions of high tension wire during rainy season?

Hi what are the safety precautions of high tension wire during rainy season? what is the precaution need to do, if the wire get cut and fallen in the road?
0
votes
3answers
57 views

What does DC voltage reading from a DMM mean?

When a DMM is set to measure DC voltage, does a read-out value correspond to an output of the ADC inside the DMM, or do multiple ADC outputs are averaged over a time interval and then converted to the ...
2
votes
1answer
89 views

How to join and connect two wires in one connector point professionaly in a high voltage PCB?

Regarding a HV (6KV) PCB design there is a part of the circuitry related to reed relay connection. I have chosen a HV relay (datasheet) with flying lead connection in order to separate physically LV ...
0
votes
1answer
73 views

Solar charge set up damaging battery?

I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
1
vote
0answers
26 views

Positive and negative terminal of a Tesla Coil

I'm trying to build a Tesla coil, I'm using it as a large voltage multiplier, though I can't figure out where is the output positive and negative terminal. thanks!
0
votes
0answers
8 views

Unrouted Nets Error in Altium 18!

So, I use Altium 18 and I was checking the Board information for my PCB. Under Nets, it showed total of 24 Nets and 0 Unrouted Nets. During my checks I found one of the nets was unconnected, yet the ...
0
votes
1answer
170 views

Inverting video signal on op-amp on positive rail only

I wish to invert a video signal, keeping the signal positive. Initially I believed the analogue signal would be 0v->5v, so I used the inverting input on an op-amp, and biased the non-inverting input ...
0
votes
1answer
19 views

What exactly is source reflection coefficient and input reflection coefficient?

I just come across learning Microwave Amplifier. And I encounter two similiar coefficients: source reflection coefficient and input reflection coefficient. Illustration below from Microwave Engineer, ...
0
votes
1answer
61 views

Parallel Transistors Current Sharing

If we have a linear power supply, which uses parallel power transistors (NPN) as series element, with emitter current sharing resistors, then which is the maximum acceptable difference of current ...
1
vote
2answers
63 views

Why there is no a variable-frequency crystal oscillator?

Quartz crystal oscillators have better frequency stability than tuned circuits of capacitors and inductors. However, they are used only as components with a fixed resonant frequency. Variable-...
-2
votes
1answer
51 views

What is the maximum torque and at what rpm a 250W, 36V BLDC motor can produce [on hold]

I am an EV enthusiast, I am working on designing a BLDC motor. My motor is a mid driven inrunner BLDC motor. The thing that is troubling me is torque. What is the maximum torque I can generate with a ...
1
vote
2answers
161 views

Low frequency receiving scheme/circuit

I was going through the documentation of TPMS sensor FXTH87 and I am trying to understand better how the low frequency receiver works. Here is a scheeme of it : I understand that the incomming signal ...
0
votes
2answers
87 views

charging 24v LiFePO4 with DC power supply intended for LED strip lights

I want to charge my 200Ah, 8 cell GBS LiFePO4 using my Honda 2000 watt generator. (I live on a boat). I have a BMS, active monitoring and all that. I just want to make sure the below power supply is ...
0
votes
0answers
17 views

Rotational voltage in induction motor

When performing dq transform on a induction motor, all axis are rotating with specific angular distance between them. If so how can the state space equation of induction motor have a voltage factor ...
0
votes
2answers
113 views

Ideal 24V DC to DC 5V Converter just to feed 556 IC

I'm trying to find a best match for a regulator that can feed dual timer ic. The 5V circuit is dedicated to that IC which will generate a PWM pulse signal to PWM control the FAN speed. It's a 4 pin ...
0
votes
0answers
28 views

How estimate Current Consumption In minutes reference

Hello I hope somebody can give a short answer. I am confused about how estimate the current consumption of a Electronic Component/device. For example a led 20ma @ 3V or an arduino mini @ 50ma. If I ...
0
votes
2answers
92 views

How to diagnose powering damages and protect again surges?

I wanted to operate remotely a motor which is controlled by a manual key switch (still in place in case the automated way fails - which happened). The switch: I though by replacing it by basics ...
21
votes
4answers
8k views

Why did my fuse blow after 3+ years of no problems?

For several years, I've had a solenoid wired to the 24VDC output of a PLC (Rockewell Automation 1769-OB16). To protect the PLC output card, a fast-acting 500mA fuse was installed between the PLC and ...

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