News-FMUSER FM/TV Broadcast One-Stop Supplier

Why 4 pins for the speaker connection on motherboards?

For as long as I can remember, the typical speaker connection on computer motherboards has 4 pins and the typical speaker has a 4 slot female connector with only two wires leading to the speaker. Is a there a technical or historical reason for the 4 pin connector?

Posted on:10-18 View:1405
Why a DC power supply doesn't have a voltage with respect to ground?

Summary: I cant understand why DC Power supply doesn't have voltage with ground I see that DC power supply have voltage between it's + & - and its 24V. However, there is no voltage with ground. I don't understand - if device's "point" has some potential, why doesn't it give some voltage

Posted on:10-18 View:1424
When Everything Else Fails: Radio Journalism During Hurricane Maria in...

ABSTRACTABSTRACTIn an era of over-reliance on online media technologies in disasters, this research examines the journalistic functions played by Puerto Rican AM radio workers during Hurricane Maria. Throughout the emergency there was total loss of electricity and communications, nonetheless local r

Posted on:10-18 View:1300
Why and How to Control Fan Speed for Cooling Electronic Equipment

Introduction Interest has been growing in integrated circuits for controlling the speed of cooling fans in personal computers and other electronic equipment. Compact electrical fans are cheap and have been used for cooling electronic equipment for more than half a century. However, in recent years,

Posted on:10-18 View:2115
Which is better -- amp ground connected to frame or battery?

There is this debate in car audio forums of this question whether it is better to connect your amp ground to the frame of the car or the battery.. basically they haven't came to a conclusion so I was curious what you guys think... Basically what I mean is that when you hook up an amp in the trunk

Posted on:10-18 View:1471
Why are PCB Trace and Layer Spacings Based on Voltage?

Summary: Why is PCB space tracing based on voltage and not e-field intensity? Wouldn't the required spacing change with dielectric? I understand that PCB trace spacing is typically based on a minimum found in certain standards and that is voltage based. If the breakdown strength of the d

Posted on:10-18 View:1222
Why are perforated PCBs preferred to striped PCBs?

Summary: Why are perforated PCBs preferred to striped PCBs? I had a book that was written for electronics enthusiasts, in which the author described various circuits for hobbyists, like thief alarm, plant pot water tester (to find out whether the soil is moist or dry), radio, etc. In al

Posted on:10-18 View:1377
Why are the motor brushes not placed in the magnetic neutral axis?

In given figure of interpoles connection for a DC Machine, why the carbon brushes connected to the commutator are not placed in the Magnetic neutral axis? The given position will induce more sparking. Interpoles solution is from following website https://www.quora.com/Electrical-Machines-What-do-in

Posted on:10-18 View:1425
Why are there three wires in secondary coil of transformer?

This is a 12-0-12 transformer that I intend to use in my circuit: Why are there three wires in the secondary? One is of course the neutral (in black). Why are there two live wires? As an additional question, can I use four 1N5408 rectifier diodes to convert the output of this transformer to

Posted on:10-18 View:1217
Why are there three wires in secondary coil of transformer?

This is a 12-0-12 transformer that I intend to use in my circuit: Why are there three wires in the secondary? One is of course the neutral (in black). Why are there two live wires? As an additional question, can I use four 1N5408 rectifier diodes to convert the output of this transformer to

Posted on:10-18 View:1263

Previous 121314 15 16 Next

Products Category

Products Tags

Fmuser Sites