0
votes
0answers
5 views

flash memory problem ,not recognized!

My flash memory with type "VERICO" fell down from one meter high.. and then I face a problem to open the flash memory from any computer "not recognized at all " . its light indicator is working when ...
1
vote
1answer
14 views

Is CE marking on module necessary?

Suppose a RF module has passed CE EMC tests. Must the CE marking be printed on the module itself in order for the approval to be valid if it is to be used in an end product?
1
vote
0answers
10 views

Inverting buck-boost converter

I'm not really sure why an inverting buck-boost might be disadvantageous compared to a non-inverting converter. If the load has a particular polarity, then can't you just connect it backwards to ...
0
votes
0answers
6 views

Atmega328p problem

Im making a 8x16 rgb led matrix based on this :http://solderlab.de/index.php/hardware/matrix-controller-board i downloded the scematics and made my own pcb. im using 3x tlc5940 one for each collor ...
-1
votes
2answers
39 views

Why these can't be an amplifier?

I am asking if we have a voltage signal must be amplified why we can't mount it in a resistance less than one and take the output as a current by using Ohm's law I = V/R and R is less than one ?
0
votes
0answers
12 views

Increaseing the detection range of the Microsoft Kinect by using a more powerful laser emitter

The kinect emits a pre-defined point-cloud of IR laser dots which are used to calculate the depth of the scene. What would be the path of least resistance for increasing the range of the kinect to ...
0
votes
0answers
18 views

Draw circuit for the hardware stack

A hardware stack holds a maximum of four one bit input data values. The stack has the following inputs: clk, p (when p = 1 PUSH, ...
1
vote
0answers
9 views

Mute Switch Jack and XLR with Phantom Power

My Missus got a loop pedal for her birthday, and found that she wanted to be able to mute the guitar and mic when not using to stop wrong noises in there, so I've decided to build her a mute switch. ...
0
votes
0answers
8 views

Why are pullups needed on eMMC data lines?

The JEDEC spec for eMMC shows pullups on both CMD and DAT lines. The pullup for the CMD line is obviously necessary as it sometimes operates in open drain mode, this necessity is represented by Rod ...
0
votes
0answers
11 views

Eagle library for TLE2425

I am designing a development board and I need the TLE2425 component. Searched the internet and I not found one library for this component. I don't have experience in creating components in Eagle and ...
0
votes
0answers
10 views

Atlium repeated sheets

I have a sheet that needs to be repeated 30 times. Normally this has not been an issue. However, one of the components in the sheet is a shift register that has a serial in and a serial out (for ...
0
votes
0answers
21 views

Protection Circuit Module for 18650 Li-Ion Pack

I'm planning to build a 7.4V battery pack to power my bike light. My current battery has died as it was left for a long time. It has 4 x 18650 cells in 2s2p configuration. All cell voltages are now ...
0
votes
1answer
20 views

Where do you put the gate-protection zener diode in an NMOS H-Bridge?

Do you even include it for an NMOS H-bridge? Because typically I've only ever seen them in NMOS/PMOS bridges, not full NMOS bridges. (Inductive load) The protection zeners would go here right?
0
votes
1answer
19 views

Question about transformer current

I got Step down transformer which reduces voltage from 230 VAC to 40 VAC ~ 100 amp. I can weld with it while having no problems. Also I got another one step down transformer which is three phase, but ...
0
votes
1answer
11 views

Atmega328P FTDI 5V USB Serial Communication

I am working a Atmega328P and FTDI 5V USB Cable to get a Serial Communication between the Micro-controller and the PC. I am using Tera Term for receiving out from Micro-controller. I am using an ...
0
votes
1answer
27 views

Home automation on Cat5e again: is this a reasonable multidrop protocol?

Previously I have asked about running I2C over CAN PHY over Cat5e cables for my home automation project. Now after a round of money saving and experimenting, it seem to me that abusing RS485 chip ...
0
votes
3answers
51 views

Can reading VGA signals from my computer harm the hardware?

I was really hoping to be able to get (or make) a Y type VGA cable with two outputs and one input. The input would be coming from my desktops graphics card (specifically an R9 270). One output would ...
0
votes
0answers
18 views

Does the choice of ground/reference node influence the results found with nodal analysis?

I'm currently taking my EE introductory course about circuit analysis and I'm having some issue. I felt like I had finally understood how to (somewhat) properly perform Nodal Analysis. I attempted to ...
-1
votes
1answer
54 views

Who triggers transistors to become H/L?

Admittedly that's quite a beginner question: When I learned that transistors work like relays and produce the digital values 0 and 1 what I always asked myself was: they have to be triggered by ...
0
votes
0answers
40 views

Explain this exercise to me?

We have the CM half circuit in the figure. I understand that $$A_\text{cm}=\frac{(\alpha\times R_\text{c})}{(2R_\text{e}+ 2re) }$$ but how is this equal to $$\frac{2}{8.65} $$ like it's solved in ...
-1
votes
0answers
27 views

Does DC Ground Need to Be Stepped Down?

I'm pretty new to electronics and I have just a quick question about ground DC connections. If I have a device that is being stepped down from 12V DC to 5V DC does the ground wire need to be stepped ...
0
votes
1answer
48 views

How is water resistance of a device measured?

This question has relation to physics as well, but since it is electronic related, it is here. I was watching a video that is testing the water resistance of Apple Watch. They say, at 3 feet the ...
0
votes
1answer
23 views

Replacing speakers' transformer [duplicate]

I have recently purchases new speakers and I have noticed a slight hum coming from the transformer, therefore I am considering replacing it. The transformer, used to power an internal amplifier, ...
1
vote
2answers
54 views

Transformer Inductance not taken into account?

When modeling an ideal transformer, why do we not consider the inductance of the primary and secondary winding of the transformer. Wouldn't this inductance affect the current pulled from the source? ...
2
votes
1answer
36 views

Finding amplitude and phase response of an amplifier

I have a following problem, I have to find amplitude and phase response of an amplifier whose function is $$ H(s)={\frac {1}{s^2 + s + 100}} $$ I have solved simillar problems such as for this ...
0
votes
2answers
31 views

AVR programmer power supply (ISP ATMEGA16 ATmega32 Minimum Board)

In description of an AVR programmer, it is talked about everything except for the input voltage and how to turn it on. How much voltage should I apply to it? Somewhere it has mentioned "DC-005 Power ...
-2
votes
0answers
32 views

GPS tracking for valuables [on hold]

What type of specific engineer is used to develop a micro gps or similar tracking device?
-3
votes
0answers
10 views

Node Analysis Q find I knot using node analysis?

Im stuck in this question. I've solved it using mesh analysis but in the question it's written only to solve using node analysis. Q Find the value of I knot (I.). Picture of circuit given below
-1
votes
1answer
31 views

Basic motor principles

If a tube shaped permanent magnet with circular magnetic field was introduced in to another external magnetic field, would a force act at right angles as it would a copper wire with DC voltage ...
1
vote
1answer
21 views

ATMEL AT89S52 programmer help finding suitable software for flashing over LPT

I have this old ATMEL programmer and I'm hoping to start learning about micro controllers on a lower level before I move to Arduino. Unfortunately the floppy disk that came with it is lost, and the ...
0
votes
0answers
8 views

I want To Make IR Transmitter Using STM32F2XX Controller

This is my First Questions here. I am making An IR Transmitter Using STM32F2xx. In my Project I want Implement the Pronto Protocol. My Question is, How i Transmit the code or string on IR using PWM ...
-1
votes
0answers
10 views

Interfacing 433MHz RF transmitter and receiver with 89C51 [on hold]

I would like to know how to interface these modules with two 89C51's. One to be interfaced with receiver and the other to be interfaced with the transmitter. I am doing a home automation project.
-5
votes
0answers
24 views

Chromebook-like alternatives [on hold]

Apologies if this is being asked in the wrong forum, i posted it in the Unix and Linux forum but it was deemed off-topic... I'm currently looking for a new laptop that is known to be compatible with ...
0
votes
0answers
16 views

Rotary Encoder Library for Beaglebone

I will use incremental encoder to measure angle with Beaglebone. However, I don't have any experience on decoding rotary encoder pulses into angle. Encoder : ...
-2
votes
2answers
22 views

From timer interrupt to the rerun of main function (PIC16f877)

I'm working on a basic project for a security system with PIC16f877 in MikroC, and I had a problem concerning the timer interrupt. I want the interruption to be cancelled when a chosen amount of time ...
0
votes
0answers
15 views

Unable to understand how to solve problems using DIF FFT and DIT method?

In my Signals course, currently we are studying the FFT, I have understood that there are two methods of solving DIF and DIT. But I am unable to comprehend how to use them to solve problems. I tried ...
0
votes
0answers
29 views

buy lcd controller [on hold]

I am decided to buy an LCD display. But I have problem in selecting and choosing what to buy. I am in Australia and looking for something to catch as soon as possible. When I did a search I reached to ...
0
votes
2answers
46 views

need help for saving the millis function when arduino was rebooted

I have two questions want to ask I'm using Arduino Uno with 16*2 LCD Blue ( also I have temp. sensor and two motors also 3 limit switches) ,, my code is working good, but sometimes my lcd stop ...
0
votes
0answers
12 views

Wireless interference due to SSID broadcasting

I'm not connected to the 2,4 GHz network, only to the 5GHz. But the 2,4 GHz network cannot be turned off(apple airport) so although not being used it keeps broadcasting it's SSID. I'd like to know how ...
0
votes
1answer
52 views

Making my 18650 30kW Battery array

I put this in the comments of my last question but I realised that might not get many eyeballs so I will ask it here. I have have been thinking of making a battery using 18650's. the battery ...
0
votes
0answers
6 views

Altera's DRAM Controller with UniPHY

I am trying to port a design from Xilinx to Altera, and I have issues with the DRAM controller IP (for a Cyclone-V and a LPDDR2 mem). I have managed to generate the IP, but I don't understand which ...
-1
votes
1answer
22 views

I have buyed a 750 rpm torque 3kg.cm motor but i am not able to calculate the amount of torque and rpm avilable on 7cm tyre

This is the motor i buyed http://www.snapdeal.com/product/core-dc-helical-geared-motor/719331155 I am working on project for science fair but it has become too much confusion that how much weight ...
1
vote
1answer
28 views

PIC 16F887 and the mysterious System Clock Select bit (SCS)

I'm using a PIC 16F887 and I'd like to use the internal oscillator HFINTOSC. To accomplish this, I set the IRCF 2:0 bits to 110 (4Mhz prescaler) and the FOSC 2:0 config bits to INTOSC. Now I should ...
2
votes
0answers
21 views

recommended wattage for soldering station

I'm looking at buying a new soldering station and trying to figure out what would be the right wattage. I'm going to soldering everything from electronic components (not much SMD, if any) to 16mm2+ ...
-2
votes
0answers
14 views

Control valve logic

I have this control valve which has an input control signal 0f 0..10V. Normally this means that at 0V the valve is completely closed and when the signal is 10V the valve is completely open. I found a ...
0
votes
1answer
18 views

Implementing a 8X1 multiplexer using two 4X1 multiplexer

"Obtain an 8 X 1 multiplexer with a dual 4-line to 1-line multiplexers having separate enable inputs but common selection lines. Use a block diagram construction." This is a question i came across ...
3
votes
0answers
35 views

What is the purpose of the resistor connected across ultrasonic receiver terminals?

I have seen a few circuits where a resistor is connected across the positive and negative (grounded) terminals of an ultrasonic receiver. It seems to "stabilize" the received signal. I have attached ...
1
vote
1answer
29 views

Thermocouple temperatures change drastically when my whole system is powered vs when just my arduino is powered

I apologize in advance if this should instead go in the Arduino stack exchange, but I feel it should be here. I'm using this thermocouple / amplifier pair with my Arduino Uno. I am trying to make my ...
0
votes
1answer
23 views

KiCad Multiple power inputs

I'm working on a project in KiCad. I have a connector that has multiple connections for GND, +5V, and +12V (all set to type: Power Output) in order to increase the maximum current. However, I don't ...
1
vote
1answer
30 views

Buck-boost converter dropping source voltage

I have two solar panels connected in series, and I'm using them to charge a phone. Together they provide about 7 V when I connect their leads to a multimeter or a basic circuit (i.e. Resistors/etc.). ...

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