Electrical Engineering Weekly Newsletter - Monday, September 29, 2014

Top new questions this week: Preferences: Male or Female connector on board On a prototyping board for use by students, should one place male (pin) headers or female headers on the PCB, considering that most of the pins will be unused most of the time. I'm inclined to place … connector interconnect   asked by Arne 17 votes answered by EM Fields 13 votes Why are electrons not pushed out from the conductor at an open circuit under the influence of a power source? Frequently, electric current is compared with water flow. For example, if I make a hole in a water tank, water will flow till the tank pressure and the atmospheric not become equal or the tank becomes … basic physics   asked by user3131972 17 votes answered by Owen 42 votes Why don't we get shocked when we touch a car? According to this answer to a question about car batteries: [...] so the entire chassis is an extension of the minus terminal of the battery. If this is the case, I would expect that you'd get … batteries automotive   asked by Josh Beam 11 votes answered by horta 14 votes Does changing the gap between plates change the capacitor voltage? Consider an ideal capacitor which has a length of \$\ell_1\$ between its plates. The capacitor terminals are open; they are not connected to any finite valued impedance. Its capacity is \$C_1\$ and it … voltage capacitor charge static   asked by hkBattousai 9 votes answered by gbulmer 11 votes Can I turn Radio waves into light? Wikipedia says that the frequency of light is 300 THz. I've made a radio waves transmitter that transmits about 100 MHz. If I increase the frequency of the transmitter to 300 THz, will the antenna … frequency light wave spectrum electromagnetic   asked by Michael George 6 votes answered by pjc50 6 votes Effects of impedance matching between 50 and 75 Ohm coaxial cables for 10 Mbit/s, Manchester-coded signals (20 MHz) TL,DR: This is quite a bunch of text because I have included plenty of background info. However, there will finally be a good, and precise question: Should I use an impedance matching network when … ethernet impedance-matching coax manchester-coding   asked by zebonaut 6 votes answered by Andy aka 2 votes Magnet that needs power to turn off? Inverse coil? I have never heard of such thing. But it would really suit my needs. I'm inventing a device and during it's operation, it should be able to catch an iron object any time (with a permanent magnet). … magnetics theory   asked by Tomáš Zato 6 votes answered by Spehro Pefhany 12 votes Greatest hits from previous weeks: How to build a calculator? I'm a newbie in electronics. I'm trying to build a calculator from scratch as a simple project and side hobby to keep me busy. My goal is to build a simple calculator, not a scientific or graphing … calculator   asked by KerxPhilo 12 votes answered by W5VO 28 votes How to improve torque and RPM of a DC motor? I have an FA-130 motor (DC) with permanent magnet, my power source is a 2 AA batteries (rechargeable) so a total of 2.4v. Assume that all cases will start from the same specification, theoretically, … dc-motor   asked by dpp 12 votes answered by embedded.kyle 23 votes Can you answer these? Selecting continuous pull type solenoid I own a Rail track master and it needs two pull type continuous solenoids. The age of this machine is from the 1950's and both of the previous solenoids were unidentifiable. These solenoids operate … solenoid watts component-selection   asked by Andrew Oud 1 vote Is 3dBi PCB etched GSM/GPRS Antenna Possible? Is it possible to design a GSM/GPRS antenna that has a gain of 3dBi? if not, what is the maximum gain possible with a PCB GSM/GPRS etched antenna? I'm thinking of a PCB sized 11cm long and 5cm width. … pcb pcb-design antenna pcb-fabrication pcb-antenna   asked by QwertyCoolGuy 2 votes Drawing One-sided Magnitude Spectrum of Transmitted Signal in dBW Question The voltage waveform measured at the 50ohm antenna terminal of a 11750-kHz AM (DSB-LC) short-wave broadcasting transmitter is shown in Fig. Q3. How to draw the one-sided magnitude … am graph   asked by Casper Li 2 votes

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