0
votes
0answers
2 views

pc-based oscilloscope input voltage range

I have heard that PC-based oscilloscopes have limitations for their input voltage range compared to "real" ones. I would like to know, where does this limitation comes from? Prob or enterance of ...
0
votes
0answers
7 views

How to protect current sense IC from current transients

I'm planning to use a ACS712 current sense IC to sense motor-current in a project: http://www.allegromicro.com/~/Media/Files/Datasheets/ACS712-Datasheet.ashx The device I'm building uses a relay to ...
0
votes
1answer
16 views

Arduino PWM control MOSFET

I have a bit of a problem that in hoping someone can shed some light on. I have a 4 wire fan (from a power mac g5) and I found that the pinout is positive, negative, PWM and rpm output. It's a bit ...
0
votes
0answers
10 views

If you put a MOSFET in backwards does the impedance change?

if I stick a MOSFET that should be going (S-D) to positive in backwards, and make it (D-S) to positive, all the current drops across the diode instead. This diode then approaches an impedance of 0. ...
0
votes
0answers
9 views

Ultrasonic High Voltage Generation

In non-Destructive Testing aplications it is required to drive transducers with high voltage pulses. Generally high voltage range change from 60v(for example medical aplications) to 200v(NDT). Two ...
0
votes
0answers
6 views

Problem with testing an atomic clock module with Arduino

I have a FUM DCF-U module with the AFET 77.5 - 10x60/70 antenna of the company HKW. I connect it with my Arduino for testing purposes. It needs 3.3V VDD and it uses RS232 for the communication. For ...
0
votes
0answers
11 views

What is Co(er) for a MOSFET?

http://www.aosmd.com/res/data_sheets/AOK42S60.pdf Page 2, dynamic characteristics. Why is that different to the Coss I get on, say, figure 9 at 130V? Should I add it to Coss to get an accurate ...
0
votes
0answers
16 views

Is it possible to have an antenna with a dynamic radiation pattern?

Here, "dynamic" means on-the-fly controllable. In my particular case, I would like to create a PCB that essentially contains a rotating directional antenna such that the (highly directional) ...
0
votes
0answers
15 views

Simple Interrupt Handling program?

I'm new to Embedded programming and I'm trying to understand how Interrupt handlers work in different contexts/scenarios. I just want to know how a interrupt handler would work in the following ...
0
votes
0answers
20 views

Using Metal thumb tacks to trigger events

I am new and curious to electronics, The below video shows a circuit bent keyboard using a keyboard made of thumb tacks to control the note input. I would love to know how this was done. The video: ...
0
votes
2answers
21 views

Can I convert my 3.7 volt lithium ion batteries into a usb charging power bank?

I have several high capacity 3.7 volt Li-ion batteries. How might I convert them into a USB charger for my phone? I'm not interested in the most elegant solution, or if this would be less financially ...
0
votes
1answer
14 views

Power factor correction of predominantly inductive load component with capacitor

I started preparing for the college next year, and I came across this question: How can I express the capacitance of a capacitor which needs to be connected parallel to a predominantly inductive load ...
0
votes
2answers
26 views

What is the optimal battery charging speed?

I have 3.7V 4000mAh Li-ion battery. I also have 0-30V/6A power supply which can limit output current. Provided that I charge the battery with voltage limited to 4.2V, I can change the maximum current ...
0
votes
1answer
18 views

Using an unconnected audio splitter degrades audio signal quality?

Consider that you have one of the following: These are used to connect 2 male audio connectors into only one female connection. Since I can't find, for now, where I have the audio cable extension, ...
-6
votes
1answer
34 views

Why current does not flow in few branches of these circuits?

This is the first circuit, why there is no current in upper branch. http://srecorder.com/s/1ok4 (this link will provide you the video which contain the circuit) And the last one is this circuit, ...
-2
votes
0answers
15 views

current transformer and potential transformer difference

Is there any operating principle difference between current transformer & Potential Transformer ? If not, what is the difference between them?
1
vote
2answers
36 views

Working out current, voltage and resistance in a Bridge circuit?

This community is so helpful, my thanks go out to any comment I got with helpful advice. Here's another homework problem. I've tried working most of it out, but I have a feeling that I'll have to ...
2
votes
1answer
20 views

Can I put negative voltage to the signal input of the ADS8317 A/D if I use a sufficiently large series resistor?

The datasheet of the ADS8317 A/D converter shows that it has protection diodes on the signal inputs, which have a VF of 0.35V. The maximum ratings say "Input current to any pin except supply: -20mA to ...
1
vote
0answers
16 views

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 ...
1
vote
2answers
58 views

How to build a continouous LED bar?

I would like to have something like an LED bar, except that the light emmission should not be broken up into separate lights, but be more or less continuous - without much greater light intensity per ...
0
votes
0answers
15 views

Multiple SMPS Noise

Some background: I have a HiL system for Engine Controller validation testing where the SCIU requires multiple power supplies. Currently, there are 5V, 12V and 28V supplies (TDK lambda LS150 and LS200 ...
0
votes
0answers
11 views

Lower/Raise DC output level of common emitter amplifier

I am trying to simulate an amplifier for our homework. It should output a 1-5V p-p signal into an 8ohm speaker from a 20mv input using a diode connected transistor as the input voltage bias. So far I ...
0
votes
1answer
26 views

USB and button power on solution

I've a circuit that have one input pin that should go LOW if one of two conditions is accomplished: USB is connected; Button OR Switch is pressed/slided; If USB is connected Button or Switch is ...
0
votes
3answers
34 views

Electrical Motors

We are using 24 V brushed DC motor(total 2 pieces) and VNH5019 motor driver for voiced controllable smart wheelchair. Although 2 wheels are sourced by same voltage and current; one of them fall ...
0
votes
1answer
23 views

Why should I bother with Frequency Response calculations in a Spilt-rail buck regulator design?

I'm looking at an existing implementation a split rail step-down power supply (application report). I would like to know what's the big deal with frequency response in the reference design? I think ...
0
votes
1answer
23 views

Simultaneous operation of inverter and diesel generator in a solar system

I have a problem at one of my on-grid solar system project. There is a problem which lets the solar inverter on, when the grid is off and the diesel generator is on. As you know that, the solar ...
1
vote
0answers
19 views

Serial AT commands with Bluetooth CSR8645 module

I bought a Csr8645 (bleutooth audio module). The module connect to my phone out of the box... It should support some AT commands. So I have tried some but I don't get anything in response. The only I ...
0
votes
0answers
20 views

Is it possible to use the DASH7 protocol in an arduino?

I've been reading about the protocol DASH7 but can't find much documentation about it. There seems to be a protocol stack called OpenTag writen in C and I want to know if there is something familiar ...
-2
votes
1answer
30 views

How is the concurrency control in hardware?

How a multicore's processor hardware implements concurrency read and write to memory? Is there a special dispatcher, and links that indicate memory usage?
1
vote
2answers
72 views

Designing PCB with Multiple power supplies

This is my first REAL project and i need some help. I'm working on a project where I am trying to design a PCB for controlling the environment inside an enclosed cabinet to grow a tomato plant using ...
-5
votes
0answers
40 views

Capacitor working modes

Hi guys it might be my last question because i am warned by this forum not to ask more Stupid question but it is my compulsion to ask question like that because i am not an Electronics engineer or ...
0
votes
2answers
57 views

Can we simulate FPGA board?

As a part of my curriculum, I am required to implement a project on FPGA. However, even the cheapest available boards are out of my reach (blame currency conversion !) and besides, even if I buy one, ...
0
votes
2answers
39 views

FET atmega168 - transistor needed?

I'm trying to make a BLDC controler, and I'd like to use an atmega168 as microcontroler and N-FETs (x3) to control the motor. The microcontroler will output a PWM that will control the motor's ...
0
votes
1answer
22 views

multiple mosfets controlling individual circuits sharing one pull up res?

i'd like to control several individual circuits using an array of MOSFETs and wondered if they have to have individual pull-up resistors or if they can share one connecting them to ground. Or do the ...
0
votes
2answers
48 views

How a multicore processor is initialized?

Is there any general protocol or algorithm to start a multicore processor? If so, how it works?
0
votes
1answer
39 views

Induction loop for catching lightning?

Recent thunderstorm, and a big overhead cloud to cloud lightning flash. Coincident with it, sparks jumped from a metal chair in the house. Would it be possible to get a spark from a loop of cable ...
0
votes
0answers
27 views

arduino I2C maximum number of writes per Transmisson [migrated]

Is there any limit on the number of Wire.write() commands consecutively in between the Wire.beginTransmission() command and the Wire.endTransmission() command for the Arduino Wire library?
2
votes
2answers
25 views

Difference between Quiescent Current & Shutdown current?

What is the difference between Quiescent current & shut down current. I have searched a lot but didn't find valid answer. As per as my knowledge Quiescent current is the small current which flows ...
-1
votes
1answer
29 views

How to connect speaker cables via S-Video plug

I would like to buy a speaker system consisting of an active subwoofer and two satellites. From the photos I can see, that the satellites are connected to the central sub using supplied cables with ...
1
vote
1answer
20 views

RGB matrix displays?

I'm working on firmware for LED display composed of Chinese RGB LED matrix modules (1/4 scan, 16x16, RGB). I want to find out how some pictures are displayed in three colors, is there any idea behind ...
0
votes
1answer
12 views

A6627SJP-T datasheet

i have this A6627 component in the printer. Looks like a current control circuit. Does anybody have a datasheet or at least knows the serial protocol this device uses? Thanks!!!
0
votes
0answers
23 views

3.2" TFT interface with LPC2138

I am using 3.2" TFT LCD using 16 bit parallel interface. But, due to unavailability of I/O pins I am multiplexing it using 3 state buffer and using only 8 pins to drive LCD's 16 data pins ( U2 and U5 ...
0
votes
1answer
45 views

What is the importance of EM field theory in electrical engineering? [on hold]

I am a student of electronics and instrumentation engineering and have a course of electromagnetic field theory in our semester. Though haven't gone so deep in subject but have some primary idea about ...
0
votes
2answers
50 views

+5 to 0v square wave from a 12vdc supply

I need to build a simple 0 to +5v square wave from a 13vdc (automobile) supply. The frequency of the output needs to be based on a 1vac input signal. I believe it can be done with a handful of ...
3
votes
3answers
284 views

How to solve this resistive network using divider rules and ohms law

I have a homework problem I've been trying to solve. So far I think I'm using the right formulas for the calculations. I just need help finding: The total resistance of the circuit, finding Vab ...
0
votes
0answers
52 views

Need a Citation for Advantages of Lookup Table on Microcontroller

It is a known fact that lookup tables (LUT) are faster for implementing complex functions in digital logic and MCUs (as discussed here). I need to cite their advantages in a paper I am writing, for a ...
-3
votes
0answers
25 views

how can i design a simple circuit that can be use to charge a DC(12v) using AC of 220-240V

pls I have an SLA battery of 12V I want to connect an AC of 220-240v to charge the battery. what are the processes?
1
vote
1answer
26 views

Toggle Switch to swap the connections of two buttons

I am trying to mod my arcade stick so I can switch two commonly swapped buttons on the controller. Essentially they are simple 2 terminal momentary switches connected directly to the controller PCB. ...
0
votes
1answer
23 views

Inductors for local power supply filtering

Lets say I have a circuit which involves an OpAmp and a comparator. They're both single supply running from a noisy USB power supply. Each component has local bypass capacitors, a big and a small one ...
0
votes
1answer
20 views

VHDL SPI xilinx spartan 3E

I have nearly non previous experience with VHDL and the most of the code here is given to me by the teacher. I'm trying to communicate with a ADXL362 accelerometer using SPI on a Xilinx Sparten 3E. ...

15 30 50 per page