-1
votes
0answers
7 views

WHY THE CURRENT IN BULB IS NOT VARYING

When we supply ac power to the incandescent bulb why the bulb voltage does not vary as that of ac waveform.
0
votes
0answers
6 views

How do i get antennas to transmit my signal? research class

So, for my senior project, I wanted to design a radio receiver and tranceiver. But I haven't taken any antenna course, so i don't have the antennnas to use for transmitting and receiving. What should ...
-1
votes
1answer
6 views

What is the defference between resistors, flip flops and latches?

I want the answer to the very basic level.I know what they mean individual, but what I am looking for is connection between them .
0
votes
1answer
6 views

SRD-05VDC-SL-C 5V DC relay not working with XY-DJM-5V

I'm just a beginner and need some assistance. below is a diagram of a 4CH reciever which works fine with some leds and it reports 5V positive on Data0 when holding channel 0 on the transmitter. What's ...
1
vote
1answer
10 views

Energy dissipation in RC circuit given AC sinewave input

I'm implementing a low-pass RC circuit that as an input will have an AC sine wave voltage input. How can I calculate the average power dissipation in the resistor, given R, C, peak (or RMS) voltage ...
3
votes
3answers
25 views

Neophyte question about AC vs. DC (especially for powering a home)

Here in the United States the electricity grid is AC. I have heard that AC allows transmission of power at greater distances with less loss. However, with the advent of solar panels, it would seem ...
0
votes
0answers
6 views

Using LPCxpresso with barebones LPC4337 board

I recently purchased a development board on eBay that will allow me to work with NXPs dual core LPC4337 ARM M4/M0 processor. I have experience working with uVison4 from KEIL, for the FRDM-KL25 from ...
0
votes
3answers
19 views

What is Doppler Spread

What is the plain English explanation of the Doppler Spread? Looking at different sources I come across complicated definitions which I struggle to understand. Example for such one: Doppler ...
0
votes
0answers
18 views

Using an LPC812 to relay/transform SPI commands

I'm trying to use the LPC812 as a SPI relay between an FPGA and a new FPAA. The purpose is to make the hardware backwards compatible with old firmware by taking old SPI commands from the FPGA and ...
2
votes
2answers
43 views

Connecting power source to Arduino's 5V pin

I have an Arduino board connected to a Neopixel Ring. This Ring draws more than 0.5 Ampere, so it needs its own power supply (not drawing power via the Arduino board) I found this schematic that ...
1
vote
1answer
19 views

What are .C1 and .C2 Gerber files in Altium 14?

I am currently working on a project and I'm about to get the Gerber files checked by FreeDFM.com. My question is, in my Gerber files, there are a couple that have the extension .C1 and .C2. In ...
3
votes
3answers
64 views

Will 74HC595 as LED sink damage LED when pin goes high?

If used as a LED sink, what happens if a 74HC595 pin goes high? Might the LED blow? I expect that when a pin is low, current will sink and the LED will light. What about the opposite condition? ...
0
votes
2answers
35 views

Two outlets, to power device if either is on

Basically, I have a 120V device I would like to have powered if either/both of two outlets have power. So both could be on, or just one of them. The device itself is typical in that it only has one ...
10
votes
5answers
227 views

In what situation should I keep the Brown-out Detection feature OFF on a microcontroller?

When the power supply on a microcontroller falls under a certain threshold, a brown-out conditions occurs and RAM memory may get corrupted. Provided that every power down sequence of the circuit can ...
1
vote
3answers
49 views

How do I keep my constant current source constant?

So I am trying to created a current source that will be used to drain a battery at specific time intervals for a specified duration. simulate this circuit – Schematic created using ...
1
vote
2answers
30 views

How to keep rarely-used Li-Ion batteries functional?

I have many gadgets around the house that I don't use often, recently I notice that a battery failed on an Mp3 player not used for a year. The battery now has a life of 1 minute from the original 5-7 ...
1
vote
1answer
31 views

Get peak voltage from RMS power (Audio amplifier)

I want to calculate the peak voltage output of an audio amplifier when driving at its maximum rated power, a loudspeaker. For example, an amplifier rated at 50W RMS into 8 ohms, driving an 8 ohm ...
2
votes
1answer
34 views

Differential pair output to voltage amplifier transistor

When designing an amplifier stage, like this, how does it work in a linear fashion? Suppose you're applying some feedback, the output may well be stabilized to zero, but the more "wrong" \$R_C\$ is ...
2
votes
1answer
80 views

Charging 10 1.2V nicd batteries

I have 10 x 1.2V Sanyo NiCd batteries. They are connected in series. I would like to charge them. The thing is, I don't have a charger. I looked up chargers and they are all quite expensive(I live in ...
4
votes
3answers
241 views

Theory question about “j” imaginary unit (AC circuit analysis)

I have just started to learn about AC network analysis and have some questions about "j" (or "i" on my calculator), the imaginary unit. My book doesn't go into a great deal about this, and jumps ...
0
votes
0answers
7 views

Synopsys design compiler- view datapath extraction results

I am using Synopsys Design Compiler(SDC) for synthesis with compile_ultra. This option does advanced datapath extraction which basically tries to group(or chain) ...
3
votes
2answers
57 views

Help interpreting TIP127 datasheet

I'm trying to build a constant current 2A amplifier using a TIP 127. To be honest, I have a lack of transistor knowledge. I decided to analyze a few existent circuits with a TIP127 and the datasheet. ...
2
votes
1answer
236 views

LEDs flash at the same time and not one at a time

As you can see on the illustration below, I have a voltage supply (a keyboard made of two piezo elements) with two terminals. Each one drives one LED, but since I've added a buzzer in parallel with ...
-4
votes
0answers
39 views

what is the meaning of Vtt voltage [duplicate]

i am using a digital counter ic which supports differential clock input . the differential clock input can be made compatible with a sine oscillator output using an ac coupling circuit . in the ac ...
2
votes
2answers
69 views

What is the meaning of Vtt

I was looking at the data sheet of a counter IC and the connection circuit diagram showed two connections: Vbb and Vtt What do ...
0
votes
3answers
70 views

ADC with programmable quantization levels

Does anybody know if there are ADCs with programmable threshold levels? The continuous signal is a radar signal which is to be digitized with an ADC with controllable qunatization levels. I am not ...
-1
votes
0answers
10 views

overdrive voltage margin to enter MOS into subthreshold and saturation region

What is the equation for Vgs value for any MOSFET in such a way that, Below Vgs, Mos is in subthreshold region, Above Vgs, Mos is in saturation region?
0
votes
1answer
49 views

Calculate delay in long line

Assume we are connecting a lamp to a source but line (wire) is so long (for example 20Km): Will the lamp bright after connecting the source immediately? how much time it will be? Can we calculate ...
0
votes
0answers
18 views

AC Linear Actuator Driver for Arduino

For experimental purposes I want to build a 1-axis Polar Tracker and use an Arduino as a PLC unit. As I know it's necessary to use an Opto-isolator to prevent high-voltage from affecting low-voltage ...
-1
votes
0answers
27 views

Wireless sensor network using evolutionary game theory [on hold]

I am new in matlab and i dont have idea about how simulate in matlab the following text a part of Dynamics stability in wireless sensor networks active defense model paper I need help to implement ...
1
vote
2answers
54 views

Battery Polarity

I was bored at work, and remember when i was little, putting batteries in the wrong way would stop the object from functioning, then decided to try reversing the polarity of the batteries in my torch, ...
0
votes
1answer
48 views

GPIO Pin configurations [duplicate]

I went through the data sheet of STM32F4 and found the pin configuration of GPIOs. I dont understand the difference between these configurations. • Input floating • Input pull-up • Input-pull-down • ...
1
vote
1answer
24 views

making Tphl and Tplh equal

Let's say we have the following netlist ...
0
votes
1answer
29 views

Charging batteries in series when they are connected in parallel in the circuit

I'm new to electronics and I'm trying to build a charging circuit for NiMH batteries. There are four batteries in total. Two are in series, and the other two are in series. Then these are connected in ...
1
vote
0answers
76 views

Not sure if my calculation is correct, can anyone check this RC circuit for me?

Hello everyone, so in my book I decided to do this practice question but failed to notice that the answer was not given in the back of the book. If anyone can help me confirm my answer I would much ...
0
votes
0answers
18 views

How to connect the power for VREFSD pin and anlog pin in STM32F3273 (ARM Cortex-M4) for sdadc purpose?

I have an analog amplifier which is powered at single-supply power and have an analog ground of 1.25V. I want to perform sdadc for my analog output. I am using STM32F373 (48pins), which is an ARM ...
-1
votes
0answers
24 views

AC adapter input 220V output 4.5v DC 300mA [duplicate]

We are moving to Denmark and have a Pottery Barn kids Death Star painting with LED's build in that we would like to bring for my son. Here is a link: Currently it has an adapter that reads: AC ...
1
vote
2answers
54 views

Most energy efficient way to detect motion

I am hacking together a prototype wrist band, with BLE as the main component. I'd like the device to detect a bump or a wave. What would be the most energy efficient way to do so? I'd like the ...
0
votes
1answer
42 views

Op Amp not providing sufficient gain

Hi friends I am building an Affordable Solar Radio Telescope and for it i need an amplifier..I have built the circuit described in pg 8 of this link. I have built the exact circuit but am using a ...
0
votes
1answer
41 views

Film capacitors, replacing with ceramics

I've been watching through hole film caps disappear. I've used a bunch of these in thermal control loops, http://www.digikey.com/product-detail/en/ECQ-E1106KF/EF1106-ND/56416 Still making 'em, but ...
0
votes
1answer
50 views

5V DC 500 mA adapter run 100 feet to web cam

I am using a GUCE51 USB extender 100 feet from my computer to power a web cam. The extender uses a 5V DC 500 mA power supply. Option 1: Plug the power supply into the 110V AC on the inside and run 5V ...
0
votes
1answer
36 views

RGB LED Strips with Arduino

I am trying to control an RGB LED strip with an Arduino. I have followed the tutorials in both of these websites: Using MOSFETs: https://learn.adafruit.com/rgb-led-strips?view=all Using LED ...
1
vote
1answer
39 views

Shannon versus Nyquist bit rate calculations

I am confused with the shannon channel capacity formula Versus nyquist bit rate. nyquist formula contains signal levels while Shannon formula doen't, how to refer to signal Levels in shannon's ...
0
votes
1answer
21 views

Connecting HiFi Amplifier High-Level Out to Subwoofer Low-Level In

I have an oldish Denon 375rd, with 2 zones but no pre-amp nor subwoofer outputs. I just got a Focal Cub 3 without realizing it's more of a Home Cinema subwoofer and it has NO High-Level Input, only ...
0
votes
0answers
67 views

How does a Schottky diode work?

There are no spare positive/negative charge carriers on the metal side of the diode, so the spare positive/negative charge carriers on the semiconductor side can not diffuse into the metal and ...
0
votes
0answers
47 views

Can the Hidden Markov Model be run on an ARM Cortex-M3 processor?

I'm working on an algorithm for a device that utilizes the Hidden Markov Model (HMM) to crunch data and make its predictions. Can the HMM be run on an ARM Cortex-M3 processor running at 32MHz? How ...
1
vote
0answers
75 views

Designing a current limiting circuit for my project

I've got a small DC brushless motor for which I would like to set a current limiting circuit as a protection against over-current. I thought I could pull it off with a simple fuse (or those current ...
0
votes
0answers
11 views

How do Coherence Time and Coherence Bandwidth influence the decision on the diversity scheme?

I came across a statement in a lecture slide which states: Coherence Bandwidth and Coherence Time govern our decisions about the diversity scheme that we would choose The lecture is in the field ...
3
votes
1answer
47 views

Analog off board connectivity

I have a board that I intend to control with high fidelity differential analog, I'm aiming at one part in 216. I want to connect the two boards with a COTS connector that solves most of the pick-up ...
0
votes
0answers
34 views

How to tune a radio receiver using a crystal oscillator?

I'm building my first radio receiver (a simple Ramsey HR-40 kit). The "Alignment" section of the instructions requires that I have some other device which I tune my receiver to. Since I have no such ...

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