Questions tagged [how-does-it-work]

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3
votes
4answers
817 views

Why does this H-bridge have PWM and Enable pins?

The BTS7960 H-brige has 6 pins (excluding current warning pins). Right Turn PWM Left Turn PWM Right Turn Enable Left Turn Enable VCC GND I usually connect all the "Enable" pins to HIGH and only use ...
0
votes
2answers
552 views

How to design a AC-DC circuit using only the hot/live wire has power input?

I was looking at these new IOT devices coming from CN that are designed to replace your standard wall switch with an ESP8266 smart-switch. It seems there are two types: A) the typical one where the ...
1
vote
0answers
46 views

How does this controller detect both sides?

I've come across an old joystick, which I presume worked at the time (I have no way to tell, since it uses the old serial port). Naturally I got curious how it was made and opened it up. The black ...
-1
votes
1answer
275 views

working of ring oscillator

As far as I know TRNG(hardware random number generator) is used to produce a sequence of random bits.This sequence of random bits can be used as random keys in cryptography for encryption purpose....
0
votes
1answer
34 views

solar panel to d.c motor power conversion [closed]

I am using a 50 W solar panel. So for that what will be the suituable rating of the DC motor to achieve a speed of 3000-3500rpm? In this case could we use a 250 W and 24 V DC motor?
3
votes
1answer
250 views

Explaining high voltage inverter principle (KIKUSUI COS5020 oscilloscope)

I'm trying to fix KIKUSUI COS5020 oscilloscope HV part. Here is the schematic part: Failed parts were: transistor Q651, capacitor C655. At high temperature were resistor R657 and inductor L650 (both ...
0
votes
4answers
948 views

ETHERNET communication on PIC micro-controller, where to start?

I need to implement an Ethernet communication between one board with a pic micro-controller and 16-24 other boards with micro-controllers. I don't know how to start even though i entered the ...
1
vote
3answers
775 views

Square wave at line frequency. How does it work?

I found the following circuit next to a switching power supply in an electrophysiology amplifier (AXOPATCH 200A, an instrument for a technique called "patch clamp"). References to power outlet: L: ...
0
votes
1answer
2k views

How does a Rotary Encoder work without connecting it to 5V

Like in this picture: I know we can hook 5v later externally to debounce but still, i heard it works without debounce circuit even if its bouncy. But how can it send signals if there are only output ...
4
votes
2answers
232 views

How Cropx works?

This company claims that they can determine accurate irrigation patterns on a terrain just by using 3 sensors (https://www.youtube.com/watch?t=80&v=U48XTXXi_MA). They don't talk about the actual ...
0
votes
1answer
158 views

Does circular motion of electron perpendicular to the magnetic field experiences a force?

If i am moving a charged particle in a circular motion and then applying the magnetic field perpendicular to this circular motion ,will the charge experience a force. Note that magnetic line produced ...
4
votes
2answers
1k views

Arduino Dimmer Shield Schematics Interpretation

I've read so much about Thyristors, Triacs and Rectifiers on the last days that I'm almost understanding my schematic, but I'm not there yet - I need some help. Overview: I'm making a home automation ...
2
votes
2answers
911 views

How does this electronic wall switch work with only a 2 wire circuit.

This is an RF wall switch but it uses only LIVE + LOAD1 cables like in the wall lamp switch (2 wires wall switch, load and live) If you short LIVE and LOAD the lamp turns on LIVE 220V------[SWITCH]-...
20
votes
2answers
8k views

Burned out filament but the light bulb has small resistance

The light bulb shown below is from a Christmas tree light string. The string is made up of series connected light bulbs. However if one burns out, the other bulbs keep working. Taking out the bulb ...
0
votes
3answers
207 views

Electric potential and length of wire?

The formula of electric potential is $$V=\frac{kQ}{r}$$ and the voltage across two points is \$a\$ and \$b\$ that determines the work of the electric field on a charge \$q_1\$ from \$a\$ to \$b\$. If,...
0
votes
3answers
353 views

How to use MQ-2 module?

I am totally new to hardware. Recently I bought this MQ-2 module, but I couldn't figure how to get it to work, the on the ship worked but where is the output? I mean the place where I place the ...
3
votes
1answer
5k views

Why do library book detectors make my headphones buzz?

Whenever I enter or exit a library while wearing headphones (cheaper intra-aural type), I hear loud buzzing as I pass through the book detector gate. I can vaguely speculate at a high level that there'...
1
vote
3answers
608 views

How does the basic RS Flip-Flop (also known as latch) works?

Ok this is a basic question but i am not able to figure out how does this work 1: This is the representation of the RS Flip-Flop with the truth table given in my book I am not able to connect the ...
3
votes
1answer
4k views

How does photodiode works when use in reverse-biased photoconductive mode?

I wanted to know the basic principal behind the working of a photodiode in reverse-biased photoconductive mode. What happens at the atomic level ?
1
vote
0answers
76 views

How does a Silicon-Controlled Rectifier (SCRs) work? [duplicate]

I know that when in a SCR the anode is made more positive with respect to cathode the two outermost p-n junction get forward-biased but the middle one is still reverse-biased so no current flows ...
1
vote
2answers
195 views

What are all the components used in this sketch?

I am trying my hand at electronics. Here's the sketch of a device I'd like to build that I found online. It's for a coil gun. I just don't know enough to understand the full sketch. I've been ...
2
votes
2answers
513 views

Computer controlled electronics

I have a reasonable amount of experience writing drivers for pre-existing hardware and I am looking to develop my skills and learn some more. Can anyone recommend good angle, resource or starting ...
1
vote
2answers
555 views

How does Magic Sky Control work in the new mercedes-benz?

I came across this new technology implemented by Mercedes Benz that allowed windows to be tinted just at the pressing of a button. I figured out that some voltage applied at the actual window would ...
8
votes
2answers
1k views

Using the audio input port as a voltmeter

I'm a physics undergraduate currently studying electromagnetism. I have no experience at all with playing with electronics. I'm trying to see the effect of a changing magnetic field on a closed ...
3
votes
3answers
5k views

How does this OP-AMP offset voltage measuring circuit work?

In the Operational Amplifiers part of Analog University from National Semiconductor, I saw an offset voltage measuring circuit for an OP-AMP. Here is the page. I've included some details and the ...
0
votes
2answers
2k views

How does this flasher circuit work?

I was watching the video on Forever Flasher circuit in Advent Calendar of Circuits 2011 series by vk2zay. Below is the circuit I am talking about. However, there are some things I understand and most ...
14
votes
3answers
7k views

Why does “flashing” prevent ghosting on E-Ink displays?

Anybody who owns an E-Ink device (like a Kindle) will be familiar with the phenomenon of "flashing" -- basically, when turning a page, the device will first flip all of the pixels to black, then draw ...
2
votes
2answers
4k views

References with explanations of how works CORDIC algorithm for division

Does anyone know any available reference to learn how works CORDIC algorithm to implement a division?
25
votes
3answers
37k views

How does an electronic caliper work?

How do these electronic calipers work?: I know they work by measuring the capacitance of the running track, somehow. But how do they use capacitance to measure distances - is it a linear relationship ...