User Sponge Bob

121 votes

7 answers

240k views

Why does micro USB 2.0 have 5 pins, when the A-type only has 4?

usb

asked Jul 10, 2012 at 22:16

31 votes

2 answers

89k views

What are the differences between USB and RS232?

asked Jun 25, 2012 at 23:55

31 votes

2 answers

38k views

Should I use lead free solder?

soldering lead-free

asked May 27, 2013 at 22:14

29 votes

5 answers

84k views

Standard wire colors

wire

asked Jul 23, 2012 at 5:29

20 votes

2 answers

39k views

Will crimped wire or soldered wire carry a current better?

wire wire-terminals

asked Apr 17, 2013 at 5:34

19 votes

2 answers

52k views

What wattage should a headphone amp be?

power audio amplifier

asked Jul 24, 2012 at 21:59

15 votes

5 answers

32k views

Why are high end audio connections gold?

audio

asked May 17, 2013 at 20:25

12 votes

2 answers

55k views

How do LED light bulbs work?

led

asked Jul 24, 2013 at 17:08

11 votes

5 answers

84k views

Does higher dBi mean further range, for an antenna?

bluetooth wifi antenna

asked Jul 18, 2012 at 16:16

11 votes

3 answers

91k views

What should the voltage of a fully charged lead acid battery be?

batteries battery-charging lead-acid

asked Aug 20, 2012 at 5:50

10 votes

2 answers

27k views

Can I charge a 12v sealed lead acid with an old wall-wart (not made for charging)?

batteries battery-charging lead-acid

asked Jul 24, 2012 at 1:12

10 votes

3 answers

4k views

Using SPST switch as digital input?

digital-logic switches

asked Aug 16, 2012 at 18:30

8 votes

1 answer

1k views

Why do batteries not last as long in a cold environment?

batteries resistance

asked Jul 24, 2012 at 23:09

8 votes

1 answer

7k views

How to make a balanced battery pack?

batteries battery-charging

asked Jun 28, 2012 at 22:39

7 votes

2 answers

15k views

What is RTS and CTS flow control?

flow-control

asked Aug 15, 2012 at 19:54

7 votes

1 answer

2k views

power cable: more strands, or bigger strands?

wire

asked Dec 13, 2012 at 6:00

7 votes

1 answer

686 views

What are the advantages of having USB part of the microcontroller (as the Leonardo does)?

arduino usb

asked Apr 9, 2013 at 19:00

7 votes

2 answers

1k views

Does Arduino use step down voltage regulators?

hardware arduino

asked Apr 9, 2013 at 20:17

6 votes

2 answers

2k views

How can I distinguish between a clone and a real Arduino?

arduino

asked Apr 9, 2013 at 20:34

6 votes

3 answers

2k views

How can I create a serial bridge using two Bluetooth dongles?

hardware software serial arduino bluetooth

asked Apr 9, 2013 at 18:36

6 votes

2 answers

406 views

Why do some wires in my turntable have plastic covers over them?

wire

asked Feb 4, 2013 at 4:01

6 votes

3 answers

2k views

How to use PNP transistor as a switch for serial communication

transistors serial pnp

asked Jun 20, 2012 at 6:04

5 votes

6 answers

3k views

Use UART Tx as digital output?

usb serial uart

asked Jun 21, 2012 at 19:59

5 votes

1 answer

23k views

What's the max discharge (in "C") of a Pb-acid and LiFePO4 (lithium iron phosphate)?

batteries discharge lead-acid

asked Jul 25, 2012 at 0:27

5 votes

1 answer

6k views

How does contact cleaner work?

potentiometer

asked Feb 7, 2013 at 7:16

5 votes

3 answers

896 views

Alkaline "% full" from voltage?

batteries

asked Jan 28, 2013 at 22:31

5 votes

2 answers

932 views

Why does my SSD have an FCC logo on it?

fcc

asked Aug 29, 2012 at 2:59

5 votes

3 answers

17k views

If a wire is rated 10A, 120v AC. How many amps could I put through it of 13.8v DC?

current ac dc wire

asked Oct 28, 2012 at 5:55

4 votes

6 answers

9k views

Shielded vs Twisted cables

audio analog shielding

asked Feb 18, 2014 at 23:42

4 votes

3 answers

6k views

Are sealed lead acid batteries water-resistant?

batteries waterproof lead-acid

asked Jul 23, 2012 at 23:03

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49 Questions

Why does micro USB 2.0 have 5 pins, when the A-type only has 4?

What are the differences between USB and RS232?

Should I use lead free solder?

Standard wire colors

Will crimped wire or soldered wire carry a current better?

What wattage should a headphone amp be?

Why are high end audio connections gold?

How do LED light bulbs work?

Does higher dBi mean further range, for an antenna?

What should the voltage of a fully charged lead acid battery be?

Can I charge a 12v sealed lead acid with an old wall-wart (not made for charging)?

Using SPST switch as digital input?

Why do batteries not last as long in a cold environment?

How to make a balanced battery pack?

What is RTS and CTS flow control?

power cable: more strands, or bigger strands?

What are the advantages of having USB part of the microcontroller (as the Leonardo does)?

Does Arduino use step down voltage regulators?

How can I distinguish between a clone and a real Arduino?

How can I create a serial bridge using two Bluetooth dongles?

Why do some wires in my turntable have plastic covers over them?

How to use PNP transistor as a switch for serial communication

Use UART Tx as digital output?

What's the max discharge (in "C") of a Pb-acid and LiFePO4 (lithium iron phosphate)?

How does contact cleaner work?

Alkaline "% full" from voltage?

Why does my SSD have an FCC logo on it?

If a wire is rated 10A, 120v AC. How many amps could I put through it of 13.8v DC?

Shielded vs Twisted cables

Are sealed lead acid batteries water-resistant?