# All Questions

28 views

### Wiring for a 3 phase/single phase motor [on hold]

I have an electric motor that can apparently be wired for either three phase or single phase. It is now wired for three phase with each wire connected to one of three terminals. Parallel to these ...
75 views

### P mosfet or N mosfet

I would like to know exactly when we use P-mosfet and when we use N-mosfet? How to know that the circuit should use which type of mosfet? I'm confused as I'm drawing a converter circuit which involved ...
66 views

### 512 channel LED strip controller over RJ45 (TCP or UDP based commands)

How would you make the following? I'm looking for a 512 channel LED strip (varying size) dimmer, controlled over TCP/IP or UDP. My dream board has: 512 individual channels @ 12V Each channel ...
56 views

### Affine Non Autonomous State Space system

Normally We all know the state space model of the the form der(x) = F*x(t)+G*u(t) y = H*x(t)+J*u(t). However I came across a state space model which has the following form der(x) = F*x(t)+G*u(t) + ...
41 views

### Arduino pin 10 for PWM whilst SPI slave

I need to use my Arduino Uno (ATmega328) as an SPI slave and have still have access to at least 5 PWM pins. The only issue is that this means I will have to use pin 10 (Slave select / PB2) as the ...
75 views

### Aluminum or Plastic for a board with PCB trace antenna

I have a PCB and am looking to make an enclosure for it. I was wondering if I should go with a plastic box or whether I should go with an Aluminum case. Also for better range does the PCB trace ...
96 views

### Is The Magnitude of Gyro XYZ Meaningful?

Say I have a gyro that outputs degrees/second, and I take the euclidean magnitude of the x,y, and z rotations: $$\text{magnitude} = \sqrt{x^2 + y^2 + z^2}$$ Is this actually useful? Is magnitude ...
31 views

### Signal encoding on Realtek TX2 IC [part 2]

The image below shows IC Realtek TX2 encoder (pinouts and block diagram), which is part of an RC car transmitter circuit. Datasheet refers: "The frequency of pulse depends on the local oscillator ...
54 views

### High Level Language to HDL [on hold]

I need to convert a simple program (C or Java) to HDL (especially Verilog). However, I have no idea about this conversion. Another problem is that the resulting code must be gate level. Now, This ...
66 views

### Home automation protocols to use for wifi

I am trying to zero in on which home automation protocol to use for my embedded device. I have a wireless module which connects to a router. So the protocol has to operate over wifi. I know I will not ...
254 views

### What is the role of the capacitors C2 and C3 below?

I want to build this electric guitar output to phone mic input converter: From my limited knowledge on the subject, it looks like a simple JFET preamplifier (actually, I've simulated the circuit in ...
35 views

### Ac Adapters Pri & Sec ratings what can I use?

I am a complete novice and know very little about this so please stick with me. I have a set of lights that came with an AC adapter that is now faulty. On the adapter it has: Pri: 230V-240V ...
65 views

### how to change a colour of a 7 segment display using the Arduino [on hold]

Is it possible to change Colour of an 7-segment display using an Arduino uno?
47 views

### Deepsleep mode Data saving in PIC18

I am using a PIC 18F46J50 microcontroller and the C18 compiler. I want to retain some data when the controller exits deep sleep mode. I found two registers DSGPR0 ...
35 views

### Average current (power) drawn per CPU cycle for smart phone Samsung Wonder CPU 1.4 GHz Scorpion Qualcomm MSM8255T Snapdragon [on hold]

kindly I need to know how much average current is consumed for each cycle for the above mentioned CPU
117 views

### Origin of micro Hz noise signal

Latetly we recognized a parasitic signal in our voltage measurements. It is a perfect sine wave with a period of a few hours (f = uHz). What could be the origin of such a signals? Ok, a few more ...
39 views

### Constraining the reset line

I am using Quartus II to compile my Verilog design, and I'm working to properly constrain my signals. I know how to constrain clocks, for example: ...
57 views

### What is “false triggering” in signal conditioning? [on hold]

Is false triggering about accidentally firing gates of transistors. Why does false triggering occur?
45 views

### Crystal and Oscillator [duplicate]

I know that crystal oscillator is a type of oscillator. But why in colloquial terms crystal is different from oscillator and how they are physically different?
132 views

### How are multiple power sources synchronized in a grid that uses a distribution ring?

A large distribution grid can work like this. There're several power station each outputting 50 Hz AC. Each power station feeds energy into a substation next to it which raises the voltage and then ...
38 views

### sense movement of muscles via electronic signals

I'd like to sense when a certain muscle is contracting or releasing, for instance the movement of one finger over another. Is there any existing work to do this with sensors / arduino / galvanic ...
31 views

### Schottky Diodes Depletion Region

When there is diffusion of electrons to the metal from the n-type semiconductor, why does Wikipedia says there is no charge carrier depletion region at the junction in a Schottky Diode?
25 views

### I2C pic32 slave with two address [duplicate]

I'm developping for a pic32 plateform. My application consists to realise I²C communication between µC 8051 and PIC32. The 8051 is the master and the PIC32 is the slave. I have established a I²C ...
192 views

### Using twisted pair for supply

Is using twisted pair for the supply in a long cable a good idea? The cable contains two twisted pairs; one twisted pair for CAN Bus, and the other twisted pair would be used for GND / Supply. What ...
49 views

### How do I build a light-activated motor? [on hold]

I'm trying to build a motor that is activated when light shines on a photoresistor/transistor (can anyone explain the difference?), but I'm totally lost right now. I can only utilize wires, batteries, ...
50 views

### Increase brushless motor horsepower [on hold]

we have a brushless motor where the requirement for us is to increase its horsepower output without increasing the voltage applied to it. Could anyone provide us with some ideas on modifying the ...
39 views

### Current measurement maximum time

On my multimeter I have two current measurement connection. One for the mA and one for the A. On the ampere one there's a time limitation but not on the mA one. Also they mention in the manual a kind ...
24 views

### Missing SPI1 in Output Selection Table?

In Table 11-3, p180 of http://ww1.microchip.com/downloads/en/DeviceDoc/70000657H.pdf, there is no way to map any spi1 pins?! I've gotten spi2 pins to work, but I need two buses and the part was ...
62 views

### Measuring Voltage and Curent Simultaneously with Probe?

I have very little experience with electricity, but I am doing a project in which I need to measure power output of solar cells. I am currently using this: ...
32 views

### Is my interpretation of this problem regarding a 7-word mux correct?

I have a problem on an assignment which states to draw a block diagram for a 7-word MUX and determine how many control switches it should have. I'm not exactly sure what the problem means by "7-Word." ...
22 views

### What is the functions of Safety Interface Modules?

I read a manual of safety interface modules http://info.bannerengineering.com/xpedio/groups/public/documents/literature/62822.pdf I see "The Interface Module offers a series connection of normally ...
50 views

### Multimeter resistance measure

I've found this question but they don't talk about damage (Multimeter ranges) If I measure a 20KOhm resistance an I'm for example in the 200Ohm range, can this damage my multimeter ?
71 views

### 50 Hz antena for monitoring mains frequency fluctuations

I would like to follow fluctuations of the mains frequency (50 Hz, yes, I know they are very low) in the lab without connection to the wall socket. I suppose it should be kind of antenna (capacitive ...
49 views

### Driving a Servo a Motor

I want to drive a servo rc motor I just purchased, I am a newbie in the electronics world. I would just like to test out the servo motor first and actually get it to move. So far I have figured out ...
54 views

### What are the exact conditions, in terms of graph structure, where KVL can be applied?

This might be a really dumb question, but ... My understanding of KVL (Kirchoff Voltage Law) is that when you sum all voltages around a circuit "loop", then the sum is zero. Fair enough, but in ...
103 views

### How to perform a synchronous output on the Arduino?

I have a device I'm trying to control with the Arduino. It works like this. Arduino sets and holds 'ready line' to 5V high. Device sees ready line high and sends 16 clock pulses for two bytes of ...
34 views

### What are important parameters for an op. amp. used to AC couple and bias a sine signal to prevent noise/distorsion?

As I am not very skilled with analog design I would like to get some pointers to what to look for/avoid common pitfalls. I have a signal generator that outputs a sine wave. I want to center this sine ...
42 views

### Working Of a Tunnel Diode

According to Wikipedia, The reason that a tunnel diode conducts current in reverse direction is : 1)In the tunnel diode, the dopant concentrations in the p and n layers are increased to the point ...
56 views

### Can't Program ATMEGA With ICSP

For a project I've been working on, I've re-designed a working PCB schematic so that it uses all SMD components and now features an ICSP header. The board is essentially an LED driver controlled by an ...
42 views

### CMOS inverter : Calculation of Vd

simulate this circuit – Schematic created using CircuitLab Consider the CMOS circuit shown, where the gate voltage Vg of the N-MOSFET is increased from zero while the gate voltage of ...
38 views

### Is Atheros AR6102 all I need for my wifi SD Card card reader?

I was recently asked to create an iPhone app to allow the user to view, download and remove photos from an SD card. We can't use the card reader originally chosen and for some reason I thought it ...
58 views

### What is a mutli-bit port (4-bit, 8-bit, ..etc.)

I've been researching XMOS multicore microcontrollers lately so that I can use them soon. I've worked with many development boards, even made a few of my own, although there is one thing that I don't ...
37 views

### Global and Local feedback [on hold]

For an Electronic HNC assignment I have been asked to design an op-amp based multistage amplifier with a gain of 40dB for a 100kHz signal. I am supposed to being looking at the effects of local and ...
64 views

### Nodal analysis in simple circuit

I have a circuit to solve: In this approach, I inferred the V1 from the parallel connection of voltage source. For the second node, I have applied the KCL. I also tried to do it another way, by ...
34 views

### Avrdude refuses to flash ATmega328p due to wrong signature

I have a bunch of defunct arduino boards that I'm trying to restore - Arduino Uno with ATmega328p chips. They do not respond to the usual flashing commands, so I'm trying to flash via the arduino ICSP ...
42 views

### What is the difference between TCCR1A and TCCR1B [on hold]

I had an error in the configuration of PWM for the atmega8 because I didn't set my register properly. But I thought that Timer 1 is timer 1, no matter is TCCR1A or TCCR1B. Why can I set all the timer ...
45 views

### What is MOLEX Part Number of 4-pin PWM fan connector [on hold]

I'm making PCB for my own PWM controller, but I don't want "destroy" the connector of my fan. So I will put fan connector to the output, but I don't know it's original name for CAD software. PWM fan ...
149 views

### How does an increase in operating frequency result in decrease in the size of an inverter circuit?

I was reading about inverters in a textbook where the author says that The size and cost of the circuit can be reduced to some extent if the operating frequency is increased but then inverter ...