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Questions tagged [how-does-it-work]

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5 votes
2 answers
288 views

RC coupling or LC coupling

I would like to generate a signal composed of an AC waveform and DC voltage separately, with the AC frequency range being 20 Hz to 20 kHz. I found there are two ways to achieve it: RC coupling and LC ...
Jack Huang's user avatar
9 votes
3 answers
2k views

How does this ramp generator circuit work?

The circuit is taken from Analog Dialogue, Volume 3, March 1969, the article is titled Noise and Operational Amplifier Circuits. The circuit is a ramp generator, but I can't figure out how it works. ...
ganymede's user avatar
  • 267
0 votes
2 answers
119 views

What is the working principle of this circuit? [closed]

This is a circuit for a battery condition indicator: How can I determine the base, the emitter and the collector of the transistor? How does this circuit work?
user avatar
1 vote
1 answer
125 views

How does this circuit work? BAV99 (3.3V for an ADC)

I'm having serious difficulties understanding how this circuit works. It's supposed to be around 10V at my test point with the voltage divider, but when I measure it, I get around 3.3V. It's not clear ...
William Rosado's user avatar
0 votes
1 answer
278 views

Problem updating Timer or Counter period on-fly for STM32L4 MCU

I'm trying to update TIM 2 period but it is not working. MCU is STM32L4 series Timer 6 is configured to trigger an event at every 1ms and Timer 2 is in counter mode which counts number of positive ...
CuriousByte's user avatar
4 votes
1 answer
1k views

Passive Ethernet-over-coax converters... how do they work?

I just bought a pair of these passive ethernet-over-coax converters. I was very skeptical, but they actually work! I just can't figure out how... they do not require external power, coax only has ...
Ryan Griggs's user avatar
  • 2,696
0 votes
2 answers
1k views

Rinnai water heater power and communication interface/protocol

My Rinnai tankless water heater can be connected to a wifi module that controls the recirculating pump and other functions. The only connection between the PCB of the water heater and the external ...
Alessio Sangalli's user avatar
0 votes
0 answers
761 views

Dance Dance Revolution Floor Sensor -- How Does It Work?

I'm attempting to build my own dance pad, and after researching a lot of DIY solutions, I decided to see what the original arcade machines use. They use 16 of these sensors per stage -- My question ...
Aww_Geez's user avatar
  • 101
0 votes
1 answer
518 views

MOS Capacitor Inversion Mode

Lets consider a p-sub MOS Capacitor working in Inversion mode. When the Gate potential is increased, a lot of electrons start appearing at the oxide-semiconductor interface. Are these electrons just ...
Abhishek's user avatar
1 vote
2 answers
2k views

How does the 3.3V output work in this PSU circuit?

I am trying to understand how computer PSUs work. I found the following circuit in Wikipedia and I noticed that, unlike the 12V and 5V outputs, there is no winding in the transformer for the 3.3V ...
ErnstOlch's user avatar
  • 177
3 votes
1 answer
978 views

Explain "Audio Loopback Dongle"

This AOSP/Develop/Audio page describes the following audio loopback dongle. Can someone explain it? To ensure that the output signal will not overload the microphone input, we cut it down by about ...
user19087's user avatar
  • 141
1 vote
2 answers
571 views

How does this piezo input circuit work?

The following circuit is part of an electronic drum kit, and is repeated several times on the board to connect piezo elements to a micro-controller that samples the various inputs. I've represented ...
Florian Ragwitz's user avatar
-1 votes
1 answer
530 views

How does this circuit work? DC supply from 230VAC without transformer - Radiator control board

An electrical house radiator stop heating, so I opened it and start trying to understand how the control board is working. I was very surprised to discover a very very low cost board with a power ...
ROUGEXIII's user avatar
  • 177
3 votes
4 answers
4k 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 ...
MatMis's user avatar
  • 191
1 vote
2 answers
3k 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 ...
Silent John D.'s user avatar
1 vote
0 answers
48 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 ...
user_4685247's user avatar
-1 votes
1 answer
334 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....
Shahed al mamun's user avatar
0 votes
1 answer
36 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?
rahul karmakar's user avatar
3 votes
1 answer
431 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 ...
Ernestas Gruodis's user avatar
0 votes
4 answers
2k 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 ...
Dan's user avatar
  • 25
1 vote
3 answers
831 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: ...
El Diego Efe's user avatar
0 votes
1 answer
4k 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 ...
Çay Öncesi's user avatar
4 votes
2 answers
285 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 ...
DomingoSL's user avatar
  • 507
0 votes
1 answer
358 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 ...
FranCliP's user avatar
4 votes
2 answers
2k 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 ...
user avatar
2 votes
2 answers
1k 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]-...
itai's user avatar
  • 149
21 votes
2 answers
11k 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 ...
Cornelius's user avatar
  • 5,078
0 votes
3 answers
391 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,...
Gurpreet Singh's user avatar
0 votes
3 answers
463 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 ...
user2514409's user avatar
3 votes
1 answer
7k 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'...
The Beruriah Incident's user avatar
1 vote
3 answers
814 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 ...
Deiknymi's user avatar
  • 289
3 votes
1 answer
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 ?
Deiknymi's user avatar
  • 289
1 vote
0 answers
85 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 ...
Deiknymi's user avatar
  • 289
1 vote
2 answers
230 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 ...
MVCylon's user avatar
  • 127
2 votes
2 answers
687 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 ...
gunwin's user avatar
  • 182
1 vote
2 answers
752 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 ...
menislici's user avatar
  • 113
9 votes
2 answers
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 ...
Fiat Lux's user avatar
  • 367
3 votes
3 answers
6k 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 ...
abdullah kahraman's user avatar
1 vote
2 answers
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 ...
abdullah kahraman's user avatar
18 votes
3 answers
12k 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 ...
Adrian Petrescu's user avatar
2 votes
2 answers
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?
Peterstone's user avatar
43 votes
3 answers
53k 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 ...
Thomas O's user avatar
  • 31.9k