User Mark Harrison

198 votes

8 answers

39k views

Why does USB have 4 lines instead of 3?

asked Sep 26, 2011 at 7:24

121 votes

9 answers

126k views

Tradeoffs when considering SPI or I2C?

asked Mar 31, 2012 at 4:33

106 votes

4 answers

102k views

How do I calculate the required value for a pull-up resistor?

asked Dec 13, 2011 at 22:23

58 votes

2 answers

731k views

What do solid/striped lines on a wire indicate?

asked Sep 4, 2012 at 4:29

34 votes

4 answers

49k views

Safe current limit for human contact?

asked Jan 19, 2011 at 22:45

27 votes

1 answer

169k views

What is the polarity of a car cigarette lighter adapter?

asked Oct 23, 2012 at 7:17

20 votes

2 answers

78k views

Adding mAh when wiring battery cells in series?

asked Oct 10, 2011 at 4:48

18 votes

3 answers

20k views

Simple capacitor use for buffering a battery?

asked Nov 11, 2011 at 23:54

18 votes

3 answers

25k views

Safety Guidelines for Ultraviolet LEDs?

asked Jan 29, 2012 at 3:52

15 votes

3 answers

33k views

What does it mean when there is a voltage difference between ground and neutral?

asked Jul 22, 2012 at 7:37

15 votes

1 answer

2k views

Official GPS protocol documentation?

asked Sep 5, 2018 at 17:37

14 votes

3 answers

23k views

What is a PA/LNA?

asked May 30, 2016 at 19:58

14 votes

2 answers

29k views

Is it safe to disassemble an unpowered PC power supply?

asked Dec 4, 2011 at 23:10

12 votes

5 answers

38k views

Arduino: faster alternatives to digitalread() and digitalwrite()?

asked Nov 21, 2011 at 23:31

12 votes

5 answers

13k views

Parallel charging of lipo batteries, maximum voltage difference?

asked Oct 10, 2011 at 22:13

11 votes

3 answers

37k views

Arduino: better microsecond resolution than micros()?

asked Nov 21, 2011 at 23:28

10 votes

7 answers

13k views

How to hook up a mains voltage relay?

asked Jan 4, 2012 at 23:22

10 votes

4 answers

77k views

Calculating current load for a switch?

asked Jan 8, 2013 at 7:02

9 votes

4 answers

266 views

Reasoning behind "neutral pin nearest the edge" rule of thumb?

asked Nov 9, 2012 at 8:26

9 votes

4 answers

633 views

magnetometers: do they work all over the globe?

asked Jan 19, 2011 at 6:40

8 votes

3 answers

663 views

soldering temperature/tip guides?

asked Dec 25, 2010 at 23:47

8 votes

2 answers

816 views

What is the name of this connector?

asked Oct 28, 2012 at 19:59

8 votes

2 answers

2k views

Is there such a thing as a programmable power sink?

asked May 10, 2020 at 22:31

7 votes

4 answers

11k views

Conductive Lubricant for Connectors?

asked Sep 5, 2012 at 22:24

7 votes

1 answer

26k views

How much lithium in lithium polymer batteries?

asked Jun 25, 2012 at 5:07

7 votes

2 answers

2k views

"Thumb Drive" Teensyduino form factor?

asked Dec 7, 2012 at 1:27

7 votes

3 answers

30k views

Adding voltage cutoff to a circuit?

asked Sep 20, 2011 at 7:32

6 votes

3 answers

9k views

specifying a non-momentary switch?

asked Feb 7, 2012 at 18:20

6 votes

2 answers

13k views

Implementing my own ESC (electronic speed controller)?

asked Dec 17, 2010 at 23:04

6 votes

4 answers

6k views

Algorithm for charging LI-PO batteries?

asked Jun 20, 2011 at 22:12

Stack Exchange Network

75 Questions

Why does USB have 4 lines instead of 3?

Tradeoffs when considering SPI or I2C?

How do I calculate the required value for a pull-up resistor?

What do solid/striped lines on a wire indicate?

Safe current limit for human contact?

What is the polarity of a car cigarette lighter adapter?

Adding mAh when wiring battery cells in series?

Simple capacitor use for buffering a battery?

Safety Guidelines for Ultraviolet LEDs?

What does it mean when there is a voltage difference between ground and neutral?

Official GPS protocol documentation?

What is a PA/LNA?

Is it safe to disassemble an unpowered PC power supply?

Arduino: faster alternatives to digitalread() and digitalwrite()?

Parallel charging of lipo batteries, maximum voltage difference?

Arduino: better microsecond resolution than micros()?

How to hook up a mains voltage relay?

Calculating current load for a switch?

Reasoning behind "neutral pin nearest the edge" rule of thumb?

magnetometers: do they work all over the globe?

soldering temperature/tip guides?

What is the name of this connector?

Is there such a thing as a programmable power sink?

Conductive Lubricant for Connectors?

How much lithium in lithium polymer batteries?

"Thumb Drive" Teensyduino form factor?

Adding voltage cutoff to a circuit?

specifying a non-momentary switch?

Implementing my own ESC (electronic speed controller)?

Algorithm for charging LI-PO batteries?