# All Questions

21 views

### Transformers circuit question,where is my mistake?

We have the circuit in the figure I have to find the power in the resistor 4 Ohm Mesh 1 we have : 16=2I1-8I3+V1 Mesh 2 we have V2=4I2 Mesh 3 we have 0=10I3-2I1 5I3=I1 By the circuit we notice ...
30 views

### what is the Outer casing of alkaline battery made of?

what is the outer casing of a typical small 9v alkaline battery made of? Is it conductive?
20 views

### Laser Multiplexing

I'm new to ECE stuff, but I was wondering what kind of equipment I'd need to have an 8x8 or more grid of lasers being controlled with specific on/off patterns. I'd want 5mW lasers in an 8x8 grid. It ...
38 views

### Should vias be used for every GND connection?

When making a two layer board with the bottom layer being a GND plane, should every GND pad for ICs and passives be directly connected to the GND plane using a via, or should I route all of the GND ...
21 views

### Read decimal value of a 4-bit binary input

I am quite a rookie in the VHDL world, but I seem to have hold of the basics. Atm I am working on a project, which involves me to take a 4-bit binary input (switches), read this value and convert it ...
22 views

### Using a “quick connect” terminal for IEC inlet or just soldering the wires?

I am using the Schaffner FN284-10-06 power inlet for a project. It has "quick connect" terminals, and it seems like the 3M FDI18-250Q connector would fit them. I've never used a connector like this ...
29 views

### LC3 Programming - Printing a histogram [migrated]

I have to print a list similar to the one below where the @ bin is for all non alphabetical characters and there are bins for each alphabetical character. I need to have both capital and lowercase ...
38 views

### Are there any effective estimates for up-rating resistors power capability by adding airflow?

I'm considering using a bank of resistors similar to this: http://www.vishay.com/docs/31842/fve.pdf 300-400 watt "corncob" wirewound resistors. I understand that they can be run over their spec'd ...
23 views

### 24v power supply to 24v and a Arduino

I have a Power Supply of 24 volts and 2.5A. I need something like that: http://i.imgur.com/z4oJukD.png I need a power supply of 24V and almost 1500mA and another of around 8 volts and 500mA (to ...
15 views

### Frequency of the CTC mode in the atmega328

I am trying to understand the expression for the waveform frequency of the CTC mode (p. 99 of the datasheet). Assuming that the prescaler is 1 and that $OCR0A$ is a constant value, in ...
20 views

### Arduino controlled boost converter

If I was to build a 12->65V boost converter using Texas's LM5002 regulator IC, would it be possible to tie an Arduino I/O pin directly to the EN pin to enable/disable the output, while keeping the 12V ...
37 views

### Buzzing/humming/static noise from speakers (Ground loop probably?)

I have a Creative Inspire P380, and I connected this sound system to my smart tv, it works great, but when I turn off the tv, both speakers and subwoofer are making this humming sound when you get ...
26 views

### Shielding a long cable

I was reading about the LM35 and i found this, he suggested that i must use shielding over long distances, which makes sense, but then he said i must add a capacitor and a resistor, why did he add ...
292 views

### What do you need 1.018V for?

The Fluke 732A has among 10V and 1V references also a 1.018V reference (whereas the 10V is the "main" references and the others are formed by resistive voltage dividers). While having multiple ...
17 views

### Implementation of PSK modulation/demodulation

I want to implement a BPSK modulation/demodulation using a microcontroller (Arduino Due). The carrier signal should be at 1-50 MHz and the information rate at 300 KHz. For the sender part I would ...
33 views

### PIC 16F877A interrupt handling

I am trying to write a simple code to receive and resend data using USART but the code is not working. Could someone give suggestions on possible flaws in the code? I am using USART at baud rate ...
11 views

### DS18B20 have the same 1-wire ids in proteus

I'm developing a temperature monitoring system and trying to model it in Proteus 8.1 SP1. When I try to execute rom search for multiple DS18B20 it give back just 1 ID, but if I add one DS1822 I can ...
63 views

### What's the absolute cheapest way to make a 4K HDMI recorder [on hold]

I'm looking to build my own 4K HDMI recorder, because the products currently on the market are just to expensive for me. As my title says, I'm trying to do that in the most low-cost way possible. ...
33 views

### Spartan 6 DCM unstable clock output

Spartan 6 clocking resources. The link here refers to the clocking resources of spartan-6 FPGA. I am using the DCM-CLKGEN primitive described in the link, to generate a divide-by-8 clock based on an ...
30 views

### ARM JTAG Debugging Internals

I want to learn how JTAG is interacting with ARM core more in detail. All explanations I have found so far are very basic and just cover JTAG tap controller with a simple state machine diagram. I ...
20 views

### Eagle mixed manual and autorouting approach [duplicate]

Often in Eagle I find myself routing important bits by hand manually, and then letting autoroute finish. If I want to redo the autoroute, maybe with a tweaked DRC or something, it would be convenient ...
46 views

### How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
38 views

### Electronic sensor for monitoring photosynthesis

I have to develop a sensor that can detect photosynthesis. So when the plants are exposed to sun I should get an indication that photosynthesis is happening inside the leaves. I found many products ...
32 views

### Help me implement the crossroad traffic lights using multiplexers 4/1?

I came across this problem and it has a solution and everything, but I don't understand it. Here's the illustration: So, the picture shows a crossroad which has sensors along the higher-priority DC ...
31 views

### Voltage regulation vs relative voltage tresholds?

There is a part of my circuit that uses resistance to output a voltage, in which is compared to a voltage threshold to output a digital signal. However +Vcc can vary and any voltages too far from 5V ...
30 views

### understanding charecteristics of transistors

1> While plotting input characteristics of a transistor, we choose to keep output voltage constant and plot the variation of input voltage and current. Why do we choose to keep output voltage constant ...
240 views

### Differentiator circuit - can output be larger than input?

I have a question regarding differentiator circuits, and whether or not their output voltage can be greater than their input voltage. The voltage across the resistor in such a circuit corresponds to ...
69 views

### BJT Driving an LED - Above or Below?

I will freely admit that I am mainly digital when it comes to electronics, so may help explain my confusion (that or just general incompetence). I am getting review feedback on a design, and one ...
24 views

### ATmega32 withRC filter and OpAmp

In my circuit (picture below), ATMEGA32 output is connected to a RC filter (R=100K, C=10uF 63V) to non-inverting terminal of OpAmp (LT1006). OpAmp is configured as voltage follower (Buffer Amplifier). ...
30 views

### How to bypass DC-DC converter with N-channel high side MOSFET

I have a DC-DC SMPS converter which is used as a pre-regulator in the power supply with linear post-regulator. A specific requirement is to provide mode of operation when pre-regulator is bypassed. ...
34 views

### What is processor System frequency and processor ARM frequency? [on hold]

What is processor System frequency and processor ARM frequency ?
29 views

### IR temperature Sensor reading ambient temperature in a room

I bought a product that has a IR temperature sensor and I want to receive a "good quality" ambient reading of a room. I have an idea how to use the IR sensor for the ambient, even though it would be ...
54 views

### Inconsistency in the calculation of the gain of an emitter follower

I want to calculate the gain of the following circuit, but two different ways give different results. simulate this circuit – Schematic created using CircuitLab First method: (This ...
307 views

### Does a current transformer produce a proportional voltage or current?

I bought a current transformer which looks like the one below: Datasheet I wrapped the transformer around my 10A kettle, and measured the values using my multimeter. Measuring AC Voltage, I ...
59 views

### Finding serial port on generic IP Camera PCB

Background story is that during firmware update of a generic IP Camera, with great wisdom, I managed to wipe part of the embedded Linux files, and in order to recover it, I need to access the ...
24 views

### Solar Charging Tree House Lights

I'm Building a lighting system for my tree house with 4 LED work lights I picked up at the hardware store. I want it to have solar charging and be operable via one switch. simulate this circuit ...
31 views

### hijack project microtransformer doesn't work well

I am working on a project that need to get energy harvest from smartphone headset jack.I find hijack project has a solution.the energy harvest circuit of it is below: it use coilcraft transformer ...
29 views

### Short circuit protect for Triac

I'm going to use this circuit to control some lamps. As I know a short circuit would cause the Triac to burn very fast and I need a way to protect it. Using fast fuse is cool but I need to know If any ...
14 views

### Buck Converter Error Amplifier Input Polarity Confusion (TL598)

I'm trying to design a buck converter using TL598. I'm studying the technical article Designing Switch Mode Power Supplies With the TL598 - Application Report for this purpose. This article references ...
1k views

### Why is the first band on a resistor never black?

I'm taking an electronic circuit analysis class, and I was asked to give the color of the 3rd band of a 1MΩ resistor. My answer was blue, thinking it could be black-brown-blue (01 * 1MΩ), but the ...
49 views

### How to determine IC function

I have a lab assignment coming up in which my instructor is tasking us to determine the function - essentially construct a truth table - of several unknown integrated circuits of varying difficulty. ...
11 views

### Complementary MOSFET symbol in Multisim(Electronics Workbench)

It is just me or symbol for complementary mosfet pair in NI Multisim is wrong? And actually not just the symbol, but the function itself - it doesn't work as it is supposed to(or it's just me being ...
39 views

### Help understanding Low side N-Channel MOSFET driver circuit

I took a simple circuit i found and started modifying it for my own purposes and realized i need to understand it's workings better to get where i need to be. PWM+ and PWM- comes from a LED dimmer ...
32 views

### Current Activated Diode Switch

Ok so here's my situation. I have a custom board with a micro controller that has a 6 pin connector. If I plug in a device to the connector that requires power it should provide somewhere on the ...
65 views

### Can SMT give worse performance than normal CPU?

Is there any chance of SMT (simultaneous multithreading) having worse performance than normal CPU? For example, is it possible for a normal CPU to run two programs one by one and have better ...
51 views

### How to convert an array of pixels to jpg or png?

I am doing some project on image processing in VHDL. And as output am getting array of pixels (32 bit each). I want to convert this array back to image either png or jpg or bmp. How can I do that?
88 views

### what could happen if i touch the two electrical wires of a 120 v with my hands?

In my house there is 2 wires the black one and the red one, what could happen y for example I touch both wires with my hand. we have 120 V, Pd. somehow we tried to install a lamp there but didn´t ...
24 views

### compressor wiring resistance [on hold]

Hi I have a standalone freezer that stopped working. It has a single phase compressor. I read that the resistances between three terminals should add up, i.e. R1 + R2 ~= R3. However, my compressor ...