All Questions

0
votes
0answers
3 views

How do I record and plot pH meter data in real time into an excel sheet?

I'm attempting to set up a system where I can record and plot the pH value of a solution in real time. I have a pH meter, a usb-1208ls, my laptop, and many different programs at my disposal. I am ...
0
votes
0answers
4 views

Maximum frequency of sine wave generated using AD9833 and arduino

AD9833 can generate sine wave with frequency ranging from 0 to 12.5MHz. I want to make the sine generator using AD9833 and Arduino. What is the maximum frequency of the output sine wave possible in ...
0
votes
0answers
7 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
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 ...
-2
votes
0answers
33 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?
1
vote
2answers
19 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 ...
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
1answer
38 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 ...
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 ...
-1
votes
4answers
73 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 ...
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'...
0
votes
2answers
35 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 ...
-1
votes
0answers
28 views

How does DSOs estimate annual PV production [on hold]

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 ...
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 ...
1
vote
1answer
37 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?
1
vote
0answers
27 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!
1
vote
1answer
34 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 ...
0
votes
0answers
9 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
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, ...
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-...
1
vote
2answers
45 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....
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
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
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 ...
0
votes
3answers
58 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 ...
0
votes
1answer
30 views

Missing pulse detector for low input?

I'm looking to implement a watchdog circuit. Tried the standard "missing pulse detector" schematic such as one from http://www.falstad.com/circuit/e-555missing.html - and it works well when the input ...
1
vote
0answers
23 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 ...
1
vote
1answer
48 views

How can an induction motor be “self starting”

I read that all you need to start an induction motor is to apply the AC voltage, and with time the slippage decreases. How does this happen magnetically? If a rotor, connected to a moderate sized ...
0
votes
1answer
33 views

Making QI charging desk

i want to make my desk surface qi charger but i want a large surface so integrating a pd wont work. Can i dissatsemble the charger and add multiple coils to it, or i need to buy several charges and ...
0
votes
0answers
42 views

Controlling An Optical Shutter with Laptop [on hold]

I want to control the light exposure time of a light source using an optical shutter(blocks light beam when closed). My goal is to program the shutter to open for a precise time interval (say 5.25 ...
6
votes
3answers
762 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 ...
0
votes
1answer
26 views

Triac control circuit through load

Why is it that in every triac analog dimming circuit I find that the triac triggering circuit is fed through the load and not straight from the mains??
1
vote
0answers
27 views

Bulk header pin wire? [on hold]

Does anyone know where I can find the wire that header pins are made from, or even what its called? Or even what the type of metal would be? I need it in longer lengths, anywhere from a few inches ...
0
votes
0answers
33 views

What could be the issue with this tesla coil? [on hold]

Trying to troubleshoot this tesla coil we made several years ago. It used to work, and then it didn't. What could be wrong / broken? (To test it we're using the same 13w CFL bulb as in the video). ...
0
votes
1answer
35 views

Thin CAT6 cable - RFI problems?

I have got a short length (1m) of standard fat CAT5 shielded cable that runs inside a piece of equipment before the signal exits via a bulkhead connector to a PC. It's the old kind that is a real pain ...
0
votes
0answers
31 views

Washing machine causes noise on PC speaker [on hold]

When ever our washing machine is running, I can hear noise coming out of my PC speaker, the noise is really in sync with the way washing machine spins. I figured this out after a couple of times it ...
-1
votes
0answers
30 views

Which microcontroller for homekit alarm system [on hold]

I have idea to build own PCB for alarm system which should handle following things: GSM (probably via SIM900 or Ai Thinker A6/A7) RFID (most likely external PCB) Keypad (via touch display) Homekit ...
0
votes
2answers
69 views

How come rectifier diode current waveform is not distorted?

Shockley equation is non-linear but without any linearisation effort such as in BJT small signal biasing, half wave rectifier passes almost an undistorted half sine wave. In amplifier we bring the ...
0
votes
0answers
29 views

How to program aliexpress Xilink X-SP6-X9 FPGA? [on hold]

I am new to the world of FPGA's. I just bough a Xilink X-SP6-X9 (Spartan 6) board on aliexpress but I don't know how to program it. I got this one: https://aliexpress.com/item/32665068263.html?spm=...
1
vote
0answers
16 views

EZ430 Chronos wireless on battery vs usb power [on hold]

I have a Texas Instruments EZ430 Chronos watch, and I have an issue regarding the Chronos wireless (or RF) communication on battery power vs USB power. When I put the watch on ACC mode when on ...
3
votes
0answers
75 views

Is this symbol standardised?

Sometimes there are these two half-arrow symbols on PCBs and on enclosures. See the images, for examples. Those symbols are often placed near the screws, that are to be unscrewed upon disassembly. ...
1
vote
2answers
52 views

Constant current load circuit? (20 amp)

I'm pretty new to stack exchange and I've only just gotten my basic circuit analysis classes done in college. For my school's solar racing team, I've been tasked with designing a constant current load ...
0
votes
1answer
30 views

Understanding 3ph Transformer Specs

I am looking at a Delta-Wye with 480 on primary and 208/120 on the secondary. The transformer in question is Schneider's EX30T3HCUNLP. I came across this drawing in the spec sheet but I am not sure ...
0
votes
0answers
35 views

Itsy Bitsy M4 Locked

I am tryning to program adafruit Itsy Bitsy M4 Board using Atemel studio 7. I am trying just to program freeRTOS example through Ateml Studio. I have bootloaded the Board properly. When i am trying to ...
3
votes
0answers
45 views

Frequency Divider Analog Circuit issue

I am trying to implement a divide-by-two circuit quoted from the book "Low power CMOS circuits : technology logic design and CAD tools" by Christian Piguet Could anyone advise about the spice error "...
0
votes
1answer
45 views

Mosfet pinchoff, why the n-channel moves towards source?

Suppose we have an NMOS transistor with VGS> VT. When VDS is 0, the channel depth is uniform along the transistor. However, when we increase VDS, the channel becames deeper near the source and ...
0
votes
4answers
34 views

Phase control universal motor dimmer

I need to control the speed of a 220v universal motor using arduino and I am thinking to use an atteny85 ic with a phase control circuit (ltv814 to detect zero crosses and moc3052 to drive a triac to ...
1
vote
3answers
100 views

how can homeplug device send ethernet down mains wiring

AFAIK when you wire a patch cable out of 5e, you only need to wire two of the conductors correctly for it to function as a ethernet cablebut you won't get gigabit ethernet. However Homeplug uses ...
12
votes
3answers
1k views

How does an ARM MCU run faster than the external crystal?

So before this I only worked with simple 8 bit Atmel MCUs and I realized on my development board schematics it has only a 12Mhz crystal, yet the MCU operates at up to 100MHz. (I think the default is ...

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