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Top Questions

active 1 featured hot week month

25

votes

6

answers

5k

views

How do electricians know where the line is down?

power electricity

answered yesterday Danish Ali Chaudhary 21

33

votes

3

answers

4k

views

What is this suspicious stain under a VFD's glass?

vacuum-fluorescent

modified May 18 at 18:14 Adam Haun 12k

14

votes

3

answers

1k

views

Lithium Coin Cell CR2032 battery specifications

current battery-operated cell-battery

modified May 18 at 13:39 psmears 203

8

votes

5

answers

875

views

What is the difference between a multimeter with RMS and one with True RMS?

multimeter rms

answered May 18 at 21:48 Spehro Pefhany 111k

7

votes

4

answers

2k

views

Why are motor capacitors huge in physical size even though their values are in uF range?

capacitor motor ac

modified May 17 at 6:16 Firobug 22

5

votes

2

answers

747

views

Unwanted property of large electrolytic capacitors?

capacitor

answered 2 days ago placeholder 23k

9

votes

4

answers

879

views

Rocket launcher circuit design

switches design basic delay

modified yesterday Ecnerwal 3,925

2

votes

1

answer

781

views

Can some body help me understand some parts of a schematic circuit?

pic sensor

modified May 17 at 19:20 Spehro Pefhany 111k

5

votes

2

answers

730

views

How does this oscillator work under a constant DC voltage?

oscillator tank

modified May 19 at 17:42 Peter Mortensen 1,441

4

votes

2

answers

816

views

Why two inverters in parallel?

digital-logic instrumentation

modified May 19 at 19:10 Élio Pereira 134

7

votes

1

answer

579

views

Would it be considered good practice to match the lengths of UART's Tx/Rx traces?

uart length-matching

answered 20 hours ago Ignacio Vazquez-Abrams 34.2k

2

votes

3

answers

448

views

Using LC filter instead of RC filter in mains powered circuits

filter passive-networks choke

modified May 17 at 14:04 dmitryvm 316

0

votes

3

answers

206

views

Is it possible to de-cap a ceramic capacitor

decoupling-capacitor

modified May 19 at 22:27 Dave Tweed♦ 73.9k

5

votes

2

answers

381

views

What's a potentiometer with four terminals in this schematic?

resistors components schematics potentiometer

modified 2 days ago Peter Mortensen 1,441

4

votes

4

answers

292

views

Is there any reason to use junction or Darlington transistors for power applications?

mosfet darlington bipolar

answered 15 hours ago Ecnerwal 3,925

4

votes

2

answers

516

views

Will a cut or a slot in a PCB change clearance or creepage?

pcb clearance creepage

modified May 18 at 13:41 Ilmari Karonen 640

3

votes

2

answers

849

views

I released the smoke from oscillosope probes, how to repair?

oscilloscope probe

answered 13 hours ago Vladimir Cravero 9,768

4

votes

5

answers

144

views

Can a Tesla coil's secondary wiring overlap?

capacitor circuit-analysis high-voltage coil tesla-coil

modified May 19 at 4:33 wbeaty 1,816

1

vote

2

answers

278

views

555 timer with output voltage equal to 5V?

voltage timer 555

modified 2 days ago Spehro Pefhany 111k

1

vote

3

answers

281

views

Replacing zener diode with a resistor in current limiter circuit

zener current-limiting

modified 2 days ago StainlessSteelRat 1,149

3

votes

2

answers

202

views

US5881 Hall Effect sensor not detecting AC field

arduino sensor integrated-circuit hall-effect sensitivity

modified 2 days ago transistor 17.2k

5

votes

2

answers

142

views

Why do audio op amps require such high rail voltages?

op-amp audio adc

modified 14 hours ago Sparky256 882

1

vote

2

answers

227

views

Is there any symbol for Alternate action switch?

switches symbol

modified 2 days ago W5VO♦ 11.9k

1

vote

2

answers

261

views

How to step up unregulated ~0.2-1V to regulated 5V

voltage voltage-regulator three-phase

answered May 17 at 3:10 duskwuff 3,062

2

votes

5

answers

271

views

+50

Role of Electrolytic Capacitors and whether they can be replaced by Film capacitors in battery operated power converters

power capacitor switch-mode-power-supply power-electronics component-selection

answered 9 hours ago Urausgeruhtkin 11

4

votes

4

answers

96

views

Hot and neutral have similar voltage to ground - finding the problem

power-supply grounding socket outlet neutral

answered May 18 at 8:51 Marko Buršič 3,507

0

votes

1

answer

102

views

Crystal marking

crystal

modified May 18 at 22:39 transistor 17.2k

0

votes

3

answers

98

views

Can opamps marked as single supply be driven from a dual supply?

op-amp microchip singl-supply-op-amp

answered May 18 at 13:37 dim 1,401

2

votes

3

answers

124

views

Miscalculation of current for a pure inductive circuit in LTspice

ltspice

modified yesterday The Photon 48.6k

3

votes

2

answers

122

views

Measure high voltages with a multimeter

high-voltage multimeter voltage-measurement

answered yesterday Spehro Pefhany 111k

3

votes

1

answer

66

views

SPI bus termination and pull-up resistors

spi pullup termination

modified May 17 at 16:16 SamGibson 1,010

3

votes

3

answers

131

views

Powering a microcontroller inductively from mains wire

power capacitor transformer

answered 2 days ago Whiskeyjack 1,955

2

votes

3

answers

97

views

Why is center frequency of a bandpass filter is given by the geometric average of the two cutoff frequencies?

band-pass center

answered May 18 at 11:34 Olin Lathrop 182k

3

votes

3

answers

121

views

Unknown (custom?) part

components identification

answered May 18 at 15:37 Spehro Pefhany 111k

-1

votes

4

answers

140

views

What does a transistor amplify?

transistors amplifier

answered yesterday Soumya Sambeet Mohapatra 167

5

votes

1

answer

103

views

Digital circuit to compare two voltages

voltage digital-logic

modified May 20 at 6:11 transistor 17.2k

0

votes

1

answer

79

views

Why are there unconnected exposed pads on PCBs [on hold]

pcb pcb-design

modified 2 days ago Wesley Lee 1,490

1

vote

2

answers

78

views

Nomenclature for tested PCB assemblies

pcb pcb-assembly testing manufacturing

answered 2 days ago Bageletas 108

1

vote

2

answers

47

views

Reference Designator “N”

components

answered 2 days ago Peter Bennett 18.6k

3

votes

2

answers

99

views

How does a Wilkinson power divider achieve isolation?

power-divider

modified 2 days ago Phil Frost 36.1k

1

vote

2

answers

59

views

Why does bringing TL072/TL074 non-inverting input low cause output to go high?

op-amp

modified May 16 at 18:41 G36 239

1

vote

2

answers

68

views

FCC Low Oscilation

avr fcc

modified May 18 at 11:51 DarthRubik 146

3

votes

2

answers

109

views

How is the current through resistor same as collector current in this circuit?

transistors circuit-analysis current-source circuit-design

modified 2 days ago Dave Tweed♦ 73.9k

0

votes

3

answers

100

views

Is power cycle reset different from reset pin reset?

microcontroller reset atmega328p

answered May 17 at 15:03 dwelch 3,437

1

vote

3

answers

77

views

It is possible to exist more than 1 color code for same resistance. Can i use all of these color-codes?

resistors symbol colour-coding

answered 2 days ago Andy aka 130k

1

vote

2

answers

76

views

Low voltage drop transistor/mosfet switch - 3.3V 200mA

switches low-power

modified May 18 at 21:07 Asmyldof 12k

0

votes

3

answers

74

views

Switch mode PSU minimum load

power resistors switch-mode-power-supply ohms-law

answered May 19 at 18:57 Sparky256 882

2

votes

2

answers

73

views

I am having an issue with relays sticking

relay

modified May 18 at 17:46 Tut 3,260

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