All Questions
0
votes
0answers
7 views
Expanding on Arduinos definition of a capacitor
This oversimplified explanation is somewhat confusing and I haven't been able to fully understand what they are trying to say. How would you expand? They already seem to be talking about AC and ...
0
votes
0answers
7 views
verilog state machine - state won't update
So I'm trying to simulate a state machine with outputs s and v and a state. for some reason our s and v values are updating but the state refuses to change,
any help would be awesome
...
0
votes
0answers
9 views
Getting noise on current transducer circuit
I am using a current transducer and the emon library on Arduino to calculate amperage. Below is the circuit I am using. When I first start out, the resting amperage reads at around 0.03 - 0.05 amps. ...
0
votes
2answers
10 views
Transimpedance amplifier with current amplifier circuit.
Figure shown above is the current amplifier circuit with the output current feeding into the transimpedance amplifier (I-V amplifier). I'm using a 100mV ac signal and 120 Kohm resistor to produce a ...
-1
votes
0answers
15 views
Dimensions of 512mbit sdram chip
I am wondering, what dimensions may have a chip of 512 megabit of sdram / dram like these and which technology it requires?
0
votes
1answer
10 views
Standalone driver for PS Vita lcd
I have an lcd from an original PSvita. I want to know whgere I can find a standalone drive for it if possible. If not, what are some resources I can use to build one for it?
0
votes
0answers
13 views
Touch Sensor Controller that support highest I2C devices [on hold]
I am working on a project which requires touch sensor controller that can interface highest number of I2C devices for capacitance sensing inputs. Cheaper ones could be better. I find one MPR121, it ...
0
votes
1answer
21 views
enclosure fabrication resources for the upscale hobbysist
I recently saw a beautifully made 1RU 8Ch microphone pre-amp that was in a beautiful enclosure with a very pro looking faceplate and so on. The engineer
wouldn't share who made it for semi-obvious ...
-2
votes
0answers
16 views
power consumption of electronic component
I have a question when i look into any chipset manufacturer datasheet they mention the power consumed by that chipset or any electronic component is lets say some 60mA or some XmA now is this power ...
0
votes
1answer
25 views
Purpose of capacitor and diode in analogue input protection circuit of ADC?
I am analyzing the following circuit used as an analogue input protection for an ADC ( image source: http://www.analog.com/library/analogDialogue/archives/43-04/process_control.html ):
I don't ...
0
votes
0answers
5 views
Omron E3F2-DS10B4-N photoelectric switch
can any body show me how to wire an omron E3f2-ds10b4-n photo electric switch in light On mode.It is a 100mA Max!would it need to go through a relay?it is a 10-30 vdc.i am trying to design something ...
0
votes
1answer
18 views
Glass fuse - Selection rule
If I have a circuit which have current consumption 100mA, what is the value of the fuse that I have to select so to open (burn) the fuse in the case of a short circuit? There is a theoretical or ...
0
votes
3answers
43 views
Inverting a push button
I have a push button that by default is in 'ON' state and a LED attached to it. I want the LED to light up when the button is pushed down, instead of being on by default.
As far as I understood I ...
0
votes
2answers
23 views
emitter follower output current
Is the output current of an emitter follower out of phase with input current? In the book Electronic devices and Circuit Theory, the current gain, Ai, is negative. It depends on direction on output ...
0
votes
1answer
35 views
How do I get rid of speaker static?
I made the basic TPA1517 circuit as shown on page 11 of the datasheet. When there is nothing plugged into the input, there is a lot of static. When I do plug something in, there is less static, but it ...
0
votes
0answers
9 views
(How) can I import design rules from Eagle or Altium in gEDA pcb?
As I'm using gEDA for my personal and professional designs and Eurocircuits for fabrication, I'd like to use Eurocircuits.com DRU templates in gEDA but I have no idea how to — or if possible at all. ...
0
votes
0answers
15 views
Boolean algebra - Maxterms
I have a boolean expression and I need to get to the canonical forms of it (sum of minterms and product of maxterms).
In order to get an expression for the first canonical form, I need to multiply ...
0
votes
1answer
22 views
Circuit corresponding to positively skewed bode plot
I have the following bode plot for an unknown circuit
It seems like there's underdamping going on, but otherwise I'm not really sure what sort of circuit would produce a plot like this, other than ...
0
votes
1answer
21 views
How to power up arduino and two 6v motors with 12v LiPo efficiently?
I have a 12v LiPo battery, arduino mega and two 6v dc motors (which will be powered by a motor shield). Although arduino can be powered using 12v, i don't want to do it because a lot of power will be ...
0
votes
0answers
14 views
AM3358 Usb type C support?
Does the AM3358BZCZ100 have support for USB type C? or is USB type C just like any other USB interface, I am currently looking through the data sheet so probably will find it there.
0
votes
3answers
54 views
reverse engineering a serial protocol with a scope
In lieu of a serial capture device are we able to look at the output of an rs-232 feed and correlate what we see on the scope with ASCII/hex representations (do certain voltages tend to correspond ...
0
votes
1answer
26 views
How to drop input voltage to an L7805 using a zener diode
I want 5 volts for my circuit but my rectifier gives me a voltage of 17.30 volts. I am using an L7805 regulator for all this and I want to use a zener diode on my adjustable pin of my regulator so as ...
0
votes
1answer
25 views
How can a parallel capacitor improve the power factor of an inductive load?
In phasor or vector diagram, a capacitor that is parallel to the supply can improve power factor. I know this is practically true but I don't understand the mathematical equation:
The total impedance ...
0
votes
1answer
18 views
Is full load current line or phase current?
If a question just asks for full load current, is this considered phase current or line current. Do I need to consider if it is a wye or delta because of this? With three phase power being ...
-2
votes
0answers
20 views
Insulation electrical tape for wall art
Hi I have made a collage and stuck it up on my wall with electrical tape or insulation tape ( I know it's called different names depending on where you are from ? Is this a safe tape to use for ...
2
votes
1answer
30 views
How to null offset on op amp without affecting gain?
I realize that there are a lot of questions relating to op amp offset here on electronics.se; however, none of them seemed to answer my exact question. If some of them are too similar, feel free to ...
0
votes
0answers
6 views
Arduino UNO and Arduino Pro Mini and NRF24L01+ setup not working [migrated]
I have already tried possibly all the libraries (RF24, RF24(maniacbug), RadioHead, Mirf) available to with the NRF24L01+, to no avail. I might end up returning the modules I bought or getting them ...
1
vote
2answers
19 views
Build custom ac-dc power supply- ground wire
I am building a ac-dc power supply and am wondering what I should do with the ground wire from the ac wall plug. Do I ground it to the casing on the transformer? Or should I just leave it unused? ...
0
votes
2answers
18 views
Analog to digital converter IC
I want 4 bit digital input for presetting of counter 74ls192.How can I do such task using Analog to digital converter? Is there any specific IC available for 4 bits ADC? Or do i need to design ADC ...
-2
votes
2answers
48 views
Which chip remains on when the phone is switched off but it has to detect if the power button is pressed to switch it on?
I wanted to know which is the chip that runs to detect when the power button is pressed to switch on the phone. Is the real time clock and circuit and this chip connected in any way?
1
vote
0answers
8 views
Add line in to electret microphone and mute the microphone when plug is connected
I have a megaphone with an electret microphone. I want to modify the megaphone so that I can optionally conntect a notebook's headphone out to the megaphone. So I want to add a line in connector to ...
0
votes
1answer
16 views
What does grey dots represent in Proteus and why I am getting those
I am using a 5 by 32 decoder to implement a certain sequential circuit. However I am getting strange results. Here is the Snapshot:
I don't understand why doesn't the decoder change its output when ...
0
votes
1answer
15 views
How is MOSFET modelled in DC analysis?
I am wondering how simulator (LTspice, Cadence,...) compute DC operating point of MOSFET in DC analysis.
I know that in DC analysis, capacitors are open and inductors are short.
With MOSFET how is it ...
0
votes
1answer
12 views
Identifying a connector for an AR headset
I'm trying to identify the connector between the Epson Moverio BT-200 smart glasses (similar to the Google Glass) and the battery pack/touchpad.
Some measurements:
20 pins top
20 pins below
Pitch ...
2
votes
1answer
42 views
What's the purpose of this RC filter?
The circuit is the following and i think this RC filter is used for anti debounce purposes but i'm not sure. Is it to prevent the optocoupler and the indicator LED from being "damaged" by the debounce ...
0
votes
0answers
25 views
Bike speedometer - a few questions about schematics
I'm a computer programmer, playing with electronics is my hobby so it's not like I'm very good at it. Some time ago I planned to make a speedometer for a bike but it eventually grew into an on-board ...
0
votes
1answer
21 views
Transient Voltage Protection of an automotive circuit
Im an electronics engineer student, and im doing a project where im designing a circuit which will be used in automotive applications. More specific it contains a PIC controller which has 16 ...
0
votes
0answers
14 views
Gauss's law, electrical flux density
Q. Given a 60-μC point charge located at origin, find the total electrical flux passing through the plane z = 26 cm.
I can understand what the question means, but I can't do anything. Is it using ...
0
votes
0answers
12 views
Interfacing Energy Meter with Arduino using MODBUS RTU protocol
How do I interface Rish EM 1340 energy meter with Arduino Uno? The meter has MODBUS RTU protocol and RS485 communication port. I am using RS485 to TTL converter for connecting meter to arduino. I have ...
1
vote
0answers
23 views
How does a cascode or beta-enhanced voltage amplification stage work?
I'm studying electrical engineering and we just finished a project where we had to build a power amplifier. But I think I can do better than what we did.
I read Distortion In Power Amplifiers where ...
0
votes
2answers
51 views
what will happen at output current ? when two zener diode is in series?
"what will be the output current when we connect two zener diode in series "
simulate this circuit – Schematic created using CircuitLab
?
2
votes
1answer
173 views
MSP430 launchpad's bypass capacitor mystery!
I've been looking into MSP430 launchpad's schematics and saw something that can't quite understand: the bypass capacitors for the reset button and for the P1.3 are different (1nF and 100nF ...
0
votes
0answers
35 views
Where can I buy or order cable like this
I am looking for unusual cable. Because it has to contains Coaxial inside, some pins for RS485 communication and eight Power cables around.
Any one saw something like this?
It's cable for Sewer ...
-5
votes
1answer
45 views
right way to connect leds?
I have connected 5 3W leds in series to 12V power supply.
Measured LED current is ~300mA.
Is there possible to connect 4 led's and make them drain ~700mA ?
I tried to connect 4 leds but one of them ...
0
votes
2answers
23 views
AC source resistance problem while simulating transformer in LTSpice
I am trying to build a Voltage quadruple circuit. But as per my requirement ,the source I will be using has a resistance of 25 ohms.As the input signal to too small I need to use a transformer to ...
0
votes
2answers
17 views
Interrupt and timer on PIC16F690
I 'm new to mikro c and PIC programming and I 'm having troubles shutting down the LED on RB5(green)using interrupt on RA2 and this interrupt is possible only in 5 first seconds.
Any help will be ...
0
votes
0answers
18 views
Simple three-phase circuit question
Phase voltages of three-phase circuit with Y configuration are equal by absolute value and phase difference between them are \$2\pi/3\$ and \$\theta_A=\theta_B+2\pi/3\$ and ...
0
votes
0answers
24 views
sampling below nyquist frequency
Can someone explain me that when we sample that sinusoid with a frequency below the Nyquist frequency (below half the sampling frequency), why we end up taking two samples per cycle of the sinusoid?
3
votes
2answers
384 views
Single LED powered directly from AC mains
Today I disassembled a power strip (power extension) and found a LED connected directly to AC with a normal resistor (not a power resistor). How is it working as I thought it would be burned in no ...
0
votes
0answers
27 views
PIC delay using XC8 compiler
I have been playing around with my Microchip PIC18F13K22 for a while now. But one thing I have been wondering about is the fact, that the compiler's __delay functions do not work as intended.
I have ...
