Electrical Engineering Stack Exchange Community Digest

Top new questions this week:

Best practice in transmitting sensor analog signal over longer distances (approx. 100') -- in cost sensitive products for microcontrollers

I'm looking for best practices for transmitting an analog sensor signal over long distances to a microcontroller such as the Arduino running at 3.3v or 5v. Keeping costs low is imperative. SPI and ...

microcontroller sensor wiring transmitter 4-20ma  
asked by risingtiger 14 votes
answered by VillageTech 13 votes

Minimum recommended LED drive current

I've stumbled upon a LED's datasheet that includes a strange recommendation. They want me to drive the LED at >5mA for reasons of "long term performance." I've never seen a similar thing anywhere ...

led current  
asked by Dzarda 11 votes
answered by Tony Stewart Sunnyskyguy EE75 7 votes

Where are registers and what do they look like?

I racked my brain through my comp-arch class and reread wiki’s article on hardware registers (they’re flip-flops, I get that), but one year later and I still don’t understand what a register ...

register processor  
asked by JohnnyApplesauce 8 votes
answered by Bruce Abbott 37 votes

The Intuition for RLC circuits

I'm reading through Hayt's Engineering Circuit Analysis 9e and it does a fairly good job of giving the intuition for "where" the energy is going in a damped RLC circuit, but I'm hoping that someone ...

circuit-analysis passive-networks oscillation  
asked by 1729_SR 8 votes
answered by DKNguyen 36 votes

How does an Intel processor "talk" to an I2C device?

I don't come from an Electronics background, so please bear with me. Assume an Intel processor wants to talk to a temperature sensor over the I2C bus. How does the underlying communication look like? ...

i2c bus intel  
asked by Holmes.Sherlock 7 votes
answered by Marcus Müller 15 votes

Paralleled voltage sources error in LTspice

I have the following LTspice simulation schematic. (It's a simplified version, just to demonstrate my dificulty). The LTspice simulator returns a paralleled voltage sources error even when the ...

asked by Arkadeb Sengupta 5 votes
answered by winny 13 votes

Limiting the inrush current

I have a transformer with several secondaries, and this is how I'm planing to control the inrush current: simulate this circuit – Schematic created using CircuitLab I'm using a resistor ...

asked by ElectronSurf 5 votes
answered by Andy aka 5 votes

Greatest hits from previous weeks:

Is it really OK to supply more current than what the component is rated for?

In this heavily upvoted answer the answerer states that it is okay to supply a component with more current than what it's rated for. The analogy is that (paraphrasing here) "If Johnny wants to eat two ...

power-supply current  
asked by DirtyMikeAndTheBoys 29 votes
answered by efox29 45 votes

What is the voltage range of a standard headphone jack from a phone?

I want to connect the output from the audio jack of an iPhone to an Arduino. What voltage range can I expect to see on the audio lines from the iPhone? I assume that turning the volume up on the ...

arduino audio voltage-measurement iphone  
asked by manuelBetancurt 45 votes
answered by PkP 19 votes

Open and Short Circuit questions

I am confused on the terms Open, Short, and Closed when talking about circuits. As far as I know: a) Open circuit means the wires are cut off so there will be no current flow, but there is voltage. ...

voltage current circuit-analysis  
asked by nicy12 7 votes
answered by helloworld922 11 votes

Altium: How do I flip/mirror components? X and Y don't work

So this seem like a simple question, but I'm trying to flip components in the schematic editor. If I select a component then use the keyboard shortcut X or Y, it brings up a menu and does not slip the ...

pcb altium  
asked by user18482 29 votes
answered by m.Alin 46 votes

Can you clarify what an 1NO1NC switch is?

I've come across multiple mentions of switches described as 1NO1NC. They often described as having 2 options: ON/(OFF) and (ON)/OFF and from what I gather they have 3 terminals for wires: a NO ...

asked by Ben 12 votes
answered by Telaclavo 23 votes

Why are h-parameters used?

What is the reason for using h-parameters when describing transistors? Why are they used instead of the physical description?

asked by Gouse Shaik 6 votes
answered by Olin Lathrop 13 votes

What is "offset null" in IC 741?

What is Offset null in 1st and 5th pin in IC 741 (Op-Amp)? Why it is used, though it is not used in many circuits? Give me explanation regarding the offset null! Why offset voltage was formed in IC ...

asked by Abishek ram R 18 votes
answered by Phil Frost 22 votes

Can you answer these questions?

LVDS (from PTN3460) driven display shows fringed lines

I am developing a board which converts DisplayPort to LVDS. The LVDS is put through a PCIe switch and then fed to an APIX transmitter, which connects to the display. There's a second video path going ...

display lvds  
asked by PhreakShow 1 vote

TTL Logic Gate Resistor Values

I've been teaching myself the basics of circuits for the last few months and have been enjoying going into chip schematics. I'm trying to understand why the resistor values are as they are. For ...

ttl nand  
asked by chillcoolcat 1 vote
answered by Bruce Abbott 0 votes

Thevenin Theorem seems to not work in this 1 bit RAM RC circuit

I have a problem which consist in 1 bit RAM made of 3 MOSFETs. One of the questions is to calculate the maximum voltage that the memory element can receive. I have obtained the result by inspection ...

capacitor mosfet circuit-analysis ram  
asked by Martel 1 vote
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