Electrical Engineering Weekly Newsletter
Electrical Engineering Weekly Newsletter

Top new questions this week:

Is this true: "At over 700 Hz, current simply flows over your body"?

I have heard this in a movie clip. I was just curious to know, is this really true? Because the one thing that I do know, is that at a high voltage, the current decreases, so that it doesn't harm a ...

safety high-frequency  
asked by Pawan kumar 17 votes
answered by tomnexus 38 votes

What and Why's of termination?

I am new to electronics, and don't understand what is termination and why it is needed, especially in digital communications. Thanks

asked by user2243211 10 votes
answered by sweber 7 votes

DIY rubidium clock construction

I recently found my way onto a Datum x72 rubidium standard and had half a mind to turn it into a homebrew atomic clock, since I'm not exactly using it for a garage-based satellite business. It seems ...

asked by ecfedele 6 votes
answered by David Hunter 3 votes

How serial resistors actually reduce EMI?

I am recently working with a GSM based system, and there was this advice in the datasheet of the GSM module: 22Ω resistors should be connected in series between the module and the SIM card so as ...

resistors serial noise emc theory  
asked by BattleHamster 6 votes
answered by Some Hardware Guy 9 votes

How to know exact Decoupling Capacitor values for supply voltages?

When designing circuits using various components such as IC's a lot of the time the data sheets give you an example schematic where they will usually give you some values for decoupling Capacitors. I ...

dc coupling  
asked by Aaru 6 votes
answered by crgrace 6 votes

I didn't tin my solder bit...now what?

In my haste to get soldering with my new iron (first time soldering in more than a decade...) I completely forgot to tin my bit. Subsequently I've managed to part-tin it, but it's a bit of a mess. ...

asked by Richard Everett 4 votes
answered by Olin Lathrop 4 votes

Calculating Voltage Drop over a transistor

I have the circuit below with a Bipolar NPN transistor I have a whole bunch of currents measured with the Amp Meters for various different resistances. How do I calculate the drop in voltage across ...

asked by Azaz 4 votes
answered by Jodes 3 votes

Greatest hits from previous weeks:

How much voltage is "dangerous"?

Related: Safe current limit for human contact? From what I've heard: 110 V (or 220 V; household voltage pretty much) is dangerous (i.e. can kill you) I think there's consensus on this, no ...

voltage current safety  
asked by Mehrdad 28 votes
answered by Oli Glaser 31 votes

What is input and output impedance of an opamp?

I have never understood input and output impedances of an op-amp. If anyone can explain what these two terms mean in an op-amp I'd highly appreciate it. Thank you! ...

op-amp impedance  
asked by user734861 11 votes
answered by Phil Frost 18 votes

Can you answer these?

Analog Microphone Preamplifier

In my design I want to use a quad Operation Amplifier for amplifying the output of an Analog MEMS Microphone before connecting to the CODEC IC. I would also be using the MIC preamplifier circuit for ...

op-amp audio microphone  
asked by Ash 1 vote

3V Coin Battery Charger

I'm trying to create a stable coin battery charger. I've checked a lot of topics but the closest answers are for 3.7V Li-Ion battery. I want to charge 3V Li-Ion Battery - MS621FE from Seiko (battery ...

led batteries charging  
asked by Plamen 1 vote

Eagle: Import attributes from file

There has been a lot of questions and comments on the different ways of exporting data from eagle for BOM generation etc. however, I would be interested to heard whether or not there is a method, ...

eagle bom  
asked by Dan 1 vote
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