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H: Are there any disadvantages to having a thicker PCB?
Similiar to the question What are the advantages and disadvantages of thinner PCB thickness (<1.6 mm)?, but going the other way.
If we look at the picture in the previous question's answer, we have the following
If I increase the dielectric/prepreg spacing to s... |
H: What happens when VRAM fails?
When VRAM fails within a video device, there appear to be certain common patterns of visual artifacts. This got me thinking - when VRAM (and RAM in general) fails, what is it that's actually happening to cause these patterns?
Repeating block patterns:
Stripes:
Another common one seem... |
H: Pedal charged and pedal powered mountain bike
Pedal charged and pedal powered mountain bike... couldn't this be easily accomplished with just one DC Brushless motor or would two motors be needed? I've seen plenty of electric powered bikes. Take some fully charged batteries that power a motor and you hit the throttl... |
H: Help between 2n2222 and 2n2222a?
I am thinking about ordering this:
http://www.ebay.com/itm/x100-Fairchild-PN2222A-2N2222A-NPN-Small-Signal-TO-92-Transistors-US-Seller-/171520659038?pt=LH_DefaultDomain_0&hash=item27ef6d8e5e
and I have no idea (Google has not proven helpful) what is the big difference between a 2n22... |
H: The advantages and disadvantages of the monolithic filters
Recently I noticed there are some monolithic filters on the market, such as http://www.linear.com/product/LTC1065. I want to know what's their advantages and disadvantages comparing to the normal active filters made by discrete R,C and Opamps. What about us... |
H: IRF740 datasheet. Error in the datasheet or I'm interpreting it wrong?
According to the IRF740 data-sheet from IR or from Vishay (they are nearly the same, the Vishay is better to read), the Qg is specified as 63nC under Id = 10A Vds = 320V and Vgs = 10V.
But at page 4, Fig. 6 - Typical Gate Charge vs. Drain-to-Sou... |
H: other uses of soft core in fpga applications?
I recently got a job dealing with FPGAs. My first project is to modify an old board that uses an FPGA + MCU + Flash setup into something like FPGA (with soft core) + Flash, so we'll have one less component to deal with.
I was told the purpose of the MCU in the old board... |
H: Why 10Log(p1/p2) and 20Log(v1/v2)? Why not just 10Log(x1/x2)?
Based on my very basic current understanding of decibels in electronics, it is said that I should use the db = 10Log(p1/p2) formula if I want to calculate the power ratio in db between two values and the db = 20Log(v1/v2) formula if I want to calculate t... |
H: Half-wave diode rectifier - is textbook wrong?
I've noticed that in all resources on diodes and rectifiers, they show the output voltage as the positive half-wave of the input signal. However, that seems wrong.
I understand that there's a voltage drop across the diode, and if the total voltage is below this level, ... |
H: Is it possible to convert SPI to UART without a microcontroller?
I was wondering about converting SPI to UART only in that direction, not the other way around, without using any microcontroller or bridge.
If synchronous can be seen as a particular case of asynchronous communication, wouldn't be somehow possible to... |
H: Burning arduino bootloader with avrdude and AVR dragon on ATmega32U4 failing
I am attempting to burn a bootloader on a ATmega32U4 aka. Arduino Micro which is not succeeding. I am using a AVR Dragon with ISP interface.
avrdude -c dragon_isp -p m32u4 -P usb -U flash:w:Caterina-Micro.hex -U lfuse:w:0xff:m -U hfuse:w:0... |
H: Correctly using RE and DE with RS485
I'm trying to build a RS-485 project using MAX485's. However, I'm having trouble finding out how to correctly use the RE and DE pins. Some PDF's and websites say that RE and DE should be tied together and then connected to a pin on a microcontroller (for example). Other places s... |
H: What is the closed-loop bandwidth of the INA143 at gain 0.1?
The INA143 difference amplifier datasheet states that the device supports G=10 and G=0.1 when connected in difference amplifier configuration. However, the datasheet only gives specifications for the G=10 case.
The bandwidth there is given as 0.15MHz for ... |
H: Battery power to 5v led strip and 3.3v controller
I'm trying to build a wireless led strip using the esp8266 controller and ws2812 addressable led strip using battery power, but I'm a bit stuck on how to build the circuit.
After a bit of research I'm seeing that step-down converters are rather inefficient due to he... |
H: Implementing logic functions using universal gates
As NAND and NOR gates are universal gates, there are often questions like:
Make the output \$f = (a + b')(cd + e)\$ using NAND gates.
The problem I face is that I take a long time to first convert these logic functions into AND and OR gates and then to NAND. Eith... |
H: How to fix Hitachi HD44780 16x2 LCD garbled display in 4 bit mode?
It often happens that a HD44780 16x2 LCD shows garbled characters during usage. Most help on the web advises for using snubbing techniques to prevent voltage noise such as induction spike. I've done all that but the problem still persists. What can ... |
H: collecting Sample points on the oscilloscope
I am using a 1.5GHz bandwidth and 20GSamples/sec oscilloscope to measure a signal. The measurement is TDR(Time Domain Refelctometry)
I would like to collect the raw data from the oscilloscope. How can I do it?
Thanks & Regards
AI: On my Lecroy WaveMaster it's just file->... |
H: Connect lots sensors (more than 10, mostly accelerometers) to Raspberry Pi by using slaved Arduino solution
I am a programmer but quite new to electronics.
I am trying to connect more than 16 sensors into a RaspberryPi for analysis, because I'm mainly focusing on computing science's machine learning research.
I don... |
H: LWiP Web Server: Running website using html files
Is there any way to run web server site on lwip library without conversion html to hex, but directly using html files?
AI: There should be no issues with doing that. The main issue is how the pages are stored. If you want them included in the binary, then they have ... |
H: What wire-to-board connector is this?
I thought this would be trivial to source. Looks like the usual molex style connector. But it seems to have a 1.8 mm pitch:
Any ideas what kind of connector this is? I cannot find anything with this pitch. I'd rather not cut the cables for this project.
AI: Nope I had my names... |
H: Electricity not conducted by copper wire
Im am quite stunned as to what might be wrong.
electronics beginner
I bought today some copper wire, 20SWG /0.9MM from maplin (UK), for a project I am working on.
There is no power going through the wire. I got positive and negative of 9V battery going to breadboard, then ... |
H: Is it a problem in a single-phase system, if a generator shares neutral with the grid?
I'm planning to use a generator to bridge longer power outages. Both the house and the generator are single-phase. If the main breaker is off, it will only disconnect the phase, the neutral will still be connected to the grid. No... |
H: Need help reading mosfet Safe Operating Area graph
Im trying to figure out the current limitations of a mosfet(SISA18ADN) I'm planning to use to check how much headroom I have.
The datasheet states Continuous Drain Current that it can handle as 12.1Amps at Ta=70degreeC during 10seconds, and 38.3Amps at Tc=25C with ... |
H: What design limitations does a higher-than-average resistance trace impose?
There's a Kickstarter running right now for a machine that prints circuit boards. Rather than a traditional etching process, they use conductive (silver-based) ink to print traces and pads. It has a resistance of 12 m\$\Omega\$/in^2. What d... |
H: What RF attentuator would be used for the HackRF?
Background info:
The HackRF is an SDR Radio capable of receiving and transmitting frequencies from 10MHz to 6GHz.
Michael Ossmann, the creator of the HackRF, states in his wiki that:
The maximum RX power of HackRF One is -5 dBm. Exceeding -5 dBm can
result in pe... |
H: Does turning a light on and off quickly use more or less power than keeping them on all the time?
I just purchased 5 philips hue lightbulbs! I have a program that can do cool features (such as strobe lighting) and I was wondering if this would use a ton of power. Ie:
Will turning on and off the led lights use a ton... |
H: How can I know the phase shift or phase delay of the SMA connector and RF port?
I am now doing a project to measure the phase difference in my circuit. Figure 1 is my circuit. My target is to know the phase difference between the output of the DAC and the input of the ADC. I have known the phase of the output of th... |
H: What component: a glass tube wrapped with a wire mesh and has a single metal pole inside?
I found this while trying to fix my noisy hot/cold water dispenser. It has a blueish glow and makes a loud buzzing noise of around 56-58 Hz.
I'm planning to replace it, but there doesn't seem to be writing anywhere on it. Ar... |
H: How does the resistance of the load affects a voltage divider?
Every explanation I've seen so far about voltage dividers, only consider the two main resistors (that do the "dividing"), and pretty much ignore what happens after Vout.
The circuits in the explanations look more of less like this:
In this example the ... |
H: Problem connecting two RS232
I have a device with a RS232 communication port (3 pin,tx,rx and gnd).
When I connect it to a PC RS232, they don't communicate together.
I use hyper terminal on the PC side and all setting are correct.
Why it doesn't work? Do I need pull up or pull down resistors?
AI: If you are using t... |
H: Decreasing ADC Reference vs. Amplifying signal
I have a sensor interfaced to ADC but the Range I am getting is not enough, so now there are 2 options, Gain up the signal or Reduce ADC Gain.
But as I heard it, reducing ADC gain will cause more noisy output, but then, can't I argue that applying gain to input signal ... |
H: Can a capacitor damage an Arduino?
For a low-current IC (< 1 mA) where I need to be able to switch it on and off, I'm connecting it directly to an Arduino analog pin. In order to ensure a stable voltage, I was thinking of adding a small capacitor across the IC. But I'm wondering if this might damage the Arduino? Th... |
H: factors influencing capacitance of a cable
I am out of my depth here so I am looking for a simple explanation. If you have twisted pair cables of differing makeup, varying in conductive material, diameter of the conductor, number of twists per meter and number of pairs in the cable. What if any effect the pairs cap... |
H: Delay in 4-bit ripple carry adder?
In pic below I have drawn a full adder and mentioned their delays, please help me to verify my answer.
AI: It took me a while but here's how it is :
The first carry and sum will be available after 4.8 us. This should be straight forward.
However, for the subsequent stages, you ne... |
H: Forward biasing a diode past built-in voltage
Why can't we forward biase a diode past its built-in voltage/potential? What's the problem in doing so?
AI: As you increase the voltage across the forward-biased diode, the current increases exponentially, as does power dissipation in the diode. Eventually this exceeds ... |
H: What is the set in D FF?
I'm trying to implement a 3-bit counter using basic gates (AND, OR, XOR, NOT etc..) around 3 D-type flip-flops. The input is an increment signal that when set to 1 will allow the counter to increment by 1. There are 3 outputs count(0), count(1) and count(2) where count(0) is the lsb.
But I... |
H: Wires acting as input and Output
I always wondered how ear phone wires acted as antenna giving input to the connected device and also acted as the output driving speakers... Does the the frequency of these has to do something with such operation ? MHz and KHz.... Even thought how could something act as both input ... |
H: Calculating output voltage and current of photodiode for input towards ADC
I need to make something that reads brightness value of an LED from voltage output of photodiode.
I will be using the following parts:
OSRAM OSTAR LE UW E3B datasheet
Summary:
Forward voltage Vf (typ.): 20.8 V at forward current If = 700 mA... |
H: How far can I wire a Sensor or an electrical component that it would work?
I had this doubt in my mind. I wanted to know the range till which a sensor could be attached so that it works. Suppose I have a setup, in which my main circuit is in a room and I have a PIR sensor or a fingerprint scanner near the door. Wil... |
H: Square wave into emitter follower
I put a square wave of relatively low rise and fall time (of about 10ns), and wanted to see the response from an emitter follower output.
I put together the circuit and here's what I see on scope.
I could not explain why the fall times differ so much, and the fall time of the wa... |
H: How to design mutual inductor in proteus for wireless charging?
While designing the wireless charger, i've designed the circuitry in proteus. And it begins with the use of the dc voltage, then the oscillator and finally the transmitter circuitry and the receiver circuit.The problem arises how to design the mutual i... |
H: Input and output resistance of an opamp circuit
Recently we have been working with opamps in the lab and I never can understand how to determin the output and input impedance of a circuit with op-amps (not the input and output inpedance of the circuit itself)
We have been measuring it by placing a voltage signal in... |
H: How to adjust the offset of a full-wave precision rectifier?
I've made a full-wave precision rectifier with TL072, for a vu-meter, and the first 3 leds are ON without signal, because I have +15mV offset at rectifier output and the levels for leds are: led1=7mV, led2=10mV, led3=14mV, led4=20mV...
I want to make this... |
H: This state machine does not go into an initial state on start
This is my state machine code:
module DES_FSM (
input CLK,
input Start,
input Reset,
input [3:0] Input_Data,
input [3:0] Next_Round_Data,
output reg [3:0] Output_Data,
output reg Complete
);
reg c;
//reg [3:0] out;
... |
H: Using a multimeter
Online I've seen more simpler multimeters that you choose what your measuring. How do I use a multimeter like this for measurement
AI: As expected this multimeter will allow you to measure voltages, currents and resistances. To do so you just need to consider basic electronics. That is consider w... |
H: Beaglebone black gets shutdown signal when I move rc motors
I have a beaglebone black that I tucked inside an rc truck. I removed the radio control chip. Everywhere it had 3.9 volt logic I put in a 3.3v gpio control from the beaglebone. It works great I'm able to control everything from the beaglebone via WiFi. ... |
H: 8 bit computer graphics
I'm working on learning how 8 bit computers work and operate. I know you can make a (tedious) microprocessor with a larg amount of logic gates and such, but how does it read graphics? I know this uses a microprocessor (PIC), but what instructions tell it to draw a pixel at x, y location. I'l... |
H: Why would induced EMF be zero?
If a rectangle loop would move inside a magnetic field, would the induced ϵ be zero?
Why would it? Is it due to the induced ϵ canceling out? Being in series and in opposition?
If it we're a single wire it would have an induced ϵ = −vBL.
AI: Yes, it would be zero. According to Faraday... |
H: ULN2803A Input Pull-Downs
Recently I need use ULN2803A to drive relays. I've never used it before. I have some questions about it.
I don't find the leakage information (Icbo) of it. So if the input of it is floating, what's the output state? On or Off? If I can left the input safely floating?
In the datasheet sec... |
H: Whcih type of load sensor should i use to calculate weight placed in a shopping cart
I wish to calculate the load inside a shopping cart and i am confused on which type of load cell/sensor should i use. Assuming weight from (0-50 kg).
This sensor is to be interfaced with Arduino.
AI: You most likely want to use lo... |
H: Please explain this circuit (CNY70, Zener diode)
I am trying to build a new (Arduino based) controller for a machine that contains a circuit that uses a CNY70 to detect RPMs in a motor. The circuit takes a 5V input and I accidentally gave it 24 volts and likely blew something out. My controller is not just for th... |
H: NOR circuit with two switches
I need to make a circuit that results in a 0(off) when one or both switches are closed. I am pretty sure this is a NOR circuit, but I am confused on how to make it assert a 0 when the switch(es) are pressed.
AI: One of the simplest active circuits is simply a single transistor and a co... |
H: Output Impedance of BJT/Mosfet amplifiers
I have heard in lectures that the desired output impedance for the BJT/Mosfet Amplifiers is LOW. But these transistors are Transconductance amplifiers 'by birth'. I mean they give output current proportional to the input voltage. So WHY should there be low impedance. I thin... |
H: How do I select the best transformer/regulator strategy?
In my project, I wish to power a Raspberry PI 2 board and a small TV display like this one (http://www.adafruit.com/products/913). The RPi will draw around 1A-1.5A at 5VDC and the spec for this screen says 150mA at 12V to 250mA at 6V.
As I'm somewhat a beginn... |
H: 915 MHz FCC Certification
This question has been asked multiple times but I don't see anyone quoting hard evidence.
This link states that all devices that oscillate above 9 kHz need to undergo certification. (I would leave a comment on this question but my low reputation forbids me to do so)
This link (see ka7ehk'... |
H: AVR and STM32 ARM GPIOs state when IC is unpowered
I'd like to make a device combined two controllers: ATMega64 I already familiar with and ARM Cortex-M0 STM32F051 I'd like to be familiar with.
I'd like to directly connect GPIOs of two controllers. I hope that I will be able to choose which controller is now operat... |
H: Use or remove reset capacitor?
I am currently connecting an AVR ATXmega 16A4U in my circuit. According to AVR (http://www.atmel.com/Images/doc8278.pdf, p6) the external reset circuit should look like
simulate this circuit – Schematic created using CircuitLab
But I want to use the RESET/PDI_CLK-Pin also for progra... |
H: Can USB 3.0 SSTX lines be swapped with SSRX lines
It is given in the USB 3.0 specification that USB super-speed lines support "polarity inversion". That is SSRX_P can be swapped with SSRX_M (or SSTX_M with SSTX_P).
Can we also swap SSTX lines with SSRX lines?
That is SSTX lines can be used in place of SSRX lines a... |
H: SD card logic levels
I'd like to use an SD card using an SPI interface. My microcontroller uses GPIO logic levels of 2.8V. Do I need a level shifter, or can I connect the card directly? I've had a look at the Physical Layer
Simplified Specification, which mentions:
High Voltage SD Memory Card – Operating voltage ra... |
H: Converting karnaugh maps to Boolean expressions
My professor briefly mentioned that there are ways of "taking 0's" and "taking 1's" from a K-map that allow you to form the logical expressions differently (e.g. NAND-NAND, AND-OR, NOR-NOR, etc.). Can anyone explain this, or direct me towards a discussion on this topi... |
H: Reduce noise from a Hall effect sensor
I am currently working on a magnetic levitation project using a Hall effect sensor for distance measurement. I drive the coil using two 12 V car batteries in series to form a 24 V DC source, a MOSFET and a 3900 Hz PWM signal from my Arduino.
Here is my circuit:
I have to map ... |
H: Single supply op-amp audio amplifier
I am trying to create an op-amp amplifier that would work from single 5V supply, and would be able to amplify -100mV to +100mV audio signal to around a 1V peak-peak or so. I've came across this circuit from this article, that could seem to work, but am having trouble calculating... |
H: How to hold SMD parts in place while soldering?
I go through this every time I have PCBs I need to populate with SMD parts, and this has become more an issue as pin spacings have gotten tighter, and my hands have become less steady with age.
So far I've modified some curved tweezers with a rubber band for grip ten... |
H: Design options for tracking relative orientation of two elements
Background:
I need a system of two discrete elements where one of the elements can continually track the distance and direction to the other, and their respective orientations. The specific requirements are to be able to track distance to within 1mm (... |
H: Need to use decoded image as reference image, not original. Why?
I'm trying to review the P frame.
but I don't understand this
"Why not we use original image instead decoded image to P-frame?"
AI: The whole point of a p frame is to encode the difference from the previous frame so that it can be recreated during th... |
H: Powering board and charging coin cell at the same time
Here is what I have:
2035 coin cell battery
ATmega328
I want to have an ability to plug micro/mini usb cord and power circuit from usb and charge battery. Circuit has extremely low power consumption (almost a month on 110mAh). Right now I'm swapping batteries... |
H: NPN vs PNP Transistor Wiring
Whilst reading about differences between PNP and NPN transistors I came across the following circuit diagrams:
http://www.learningaboutelectronics.com/Articles/Difference-between-a-NPN-and-a-PNP-transistor
The uppermost circuit diagram, illustrating the function of the NPN transistor, s... |
H: Why must resistors be on the respective anode terminals instead of the common cathode terminal of a RGB LED?
Different from the best answer of this one: Why does a resistor need to be on the anode of an LED?
But well, I'm also an electronics noob ^.^
Recently I bought the official Arduino starter kit and played aro... |
H: RC integrator behavior
I am trying to implement an RC integrator circuit in my design. The purpose of this circuit is to convert input pulse signals swinging between 0 to 2.5V into a ramp signal. The integrator circuit was designed with a time constant of 2ms. The circuit is as shown below:
simulate this circuit –... |
H: Identifying an IC named T072
I'm trying to identify an IC named T072. It's used in several places inside a Rega Brio-R audio amplifier and it seems to be in the audio path. I can see it in the audio input paths but also int the record output audio path. It may be Texas Instruments based on that I see a logo that re... |
H: How robust are SMD DC power inlets compared to through-hole?
Normally it takes a reasonable amount of force to push in a (say) 2.5mm DC low voltage plug into a PCB mounted socket. For that reason I have normally only used through hole devices. How do the SMT versions compare? Is there a chance of damaging the board... |
H: Guidance & Info about Quadcopter Project
I'm new in forum and since I made some research the past days I'd like to get some guidance about constructing & programming a Quadcopter from scratch since I'm completely new on a project like that.
Quadcopter Frame: Thinking about to construct an aluminum 70cm diameter fra... |
H: What's the Laplace transfer function of a moving average?
What is the Laplace transfer function of a moving average?
$$y_k=\frac{x_k+x_{k-1}+x_{k-2}+x_{k-3}+...+x_{k-N+1}}{N}$$
I tried to get it from the z-domain transfer function using conversion tables:
$$\frac{y_k}{x_k}=\frac{1+z^{-1}+z^{-2}+z^{-3}+...+z^{-N+1}}... |
H: Opamp using Transistor Query?
I am finding it difficult to understand how transistors which are transconductors can be used to design an Opamp which is a voltage amplifier. Silly question but has really been heavy on me. Thanks.
AI: I am finding it difficult to understand how transistors which are
transconductors... |
H: Is it possible to make distinction between the touch of a bare hand and an aluminum can?
Capacitive sensing can easily detect human touch, but my case is to detect an aluminum can touching a surface equiped with some kind of sensor.
Aluminum's electrical conductivity and almost non-magnetic properties make this qui... |
H: Does reverse biasing hold any meaning in case if both terminals are n type semiconductors?
When we talk about an n-p-n transistor in common emitter configuration, we often say that emitter-collector circuit (the one towards right) is reverse biased. In what sense it is reverse biased?
Here, both terminals are n-typ... |
H: Figuring out pin configuration for a small SMD transistor
The data sheet of the dual transistor IMZ1A shows pin layout as:
But the chip I received looks like this:
There is a small dot on top left, but according to the datasheet, pin 1 should be on top RIGHT. Is there a way to make sure which is pin 1?
AI: You... |
H: Driving a 3v Latching Relay with an 1.8v logic MCU Not Working
I have a battery powered device with an 8051-base MCU running off a 3v coin cell (with a DC/DC converter down to ~2.1v).
I'm attempting to drive a 3v dual-coil latching relay using two GPIO pins of the MCU with the following schematic:
simulate this ci... |
H: What is the equivalent resistance in this part of the circuit?
I broke the circuit down into as basic as I can take it, and I know what X and Y are, but I can't figure out the equivalent resistance of the circuit in the middle. It seems to me like the current would flow around the resistor, but then there'd be no p... |
H: What is the max amps for the Adam 6050 module
I recently purchased an Adam 6050 module and need to power it up. However the manual seems a little vague, other than mentioning that it has a 10-30 volt unregulated power range. And that it consumes 2W at 24V.
Near the bottom of the manual I found a note saying to us... |
H: Why are watts used as a measurement for some appliances?
Why do some appliances tout watts and some others advertise volts. I know watts is a measurement of volts*current but looking at just watts alone, what does that tell us about the appliance? Can't volts be low and current be high to get the same amount of pow... |
H: Modular mixing table with balanced internal bus: is this a proper way to do it?
TL; DR: Is the schematic below seem like a proper way of building a mixing console with differential internal bus?
I always wanted to have a mixing console but I want to do it the maker way: build one from scratch, using my own design.... |
H: Transfer function of a R+RLC low pass filter
Here's a picture of the R+RLC circuit:
I'm trying to find the frequency response of this low pass filter, my solution is below and please let me know if there is anything wrong with it.
My solution:
$$ \\
x=V_{in} \\
y=V_{out} \\
x-y = (i_1+i_2+i_3)R_1 \\
y=i_1R_2 \\
y... |
H: Duplicate RX in uart (two devices listening one of which is data-logging)
I am not too familial with UART yet, and was wondering if I could some how duplicate the stream of information going to a microcontroller from a GPS. My application will be using a msp430g2553 microconltroler to communicate with a GPS module ... |
H: Using an unamplified piezo in a mic-in jack
it's my first time working with piezos and I'd like to use one as an input to my iPhone via the microphone port to allow my app to detect vibrations.
in order to do this, I was thinking that I'd use a splitter to separate the headphone and microphone channels for my iPhon... |
H: arduino: turn on-off a 12V cpu fan with optocoupler
I wish to use a simple way to turn on-off a 4 wire cpu fan using a digital output of the Arduino board. Since even with PWM=0 the fan works at 30% of the full speed, i have to find a way to cut off the power of the fan.
I came across some tutorials describing the ... |
H: Abstract Datasheet Dimension Notation
I am attempting to create a footprint for a Surface Mount Component and I am using the manufacturer's datasheet for reference. They include PCB dimensions but the notation used is a bit confusing. It has a P and I am unsure what to make of it, another is almost an order of magn... |
H: Matlab Components needed for Electrical Engineering Students
I am installing Matlab, and now I need to select the components that are required for electrical engineering projects, circuits, ect. ( for undergraduate students, not professionals)
the list is attached, please let me know which ones to select, I don't w... |
H: Connecting SSR relay
I bought a cheap SSR relay (SSR-40DA) on ebay and like to connect it directly to arduino,
Schematic on website (http://www.fotek.com.hk/solid/SSR-1.htm) shows that LEDs already have resistors in the circuit, do I need to add additional 220R resistor to output pin or not?
Thanks.
P.S. It's not... |
H: What makes a crystal oscillation to begin
I'm trying to understand how the Pierce oscillator works. Thanks to How does a Crystal work?, I've managed to understand almost all, but I'm still struggling to grasp, what causes the crystal to begin to oscillate at the very beginning? There's still no feedback AC coming i... |
H: What is a UART?
I'm taking an EdX class in embedded systems and I'm having a little trouble fully grasping what a UART is. The UART has been used as a means to an end, so it hasn't been described well yet.
A UART seems to be a communication system centered around a hardware component (also referred to as the UART?... |
H: unbalanced audio - shielding and ground loop for 2 ch
I have a 3 conductor wire that are all wrapped in a foil shield with wire conductor, for a total of 4 wires.
I am connecting the 3 inside wires to audio left, right, and ground. This is an unbalanced setup, right?
In this case, should I be shielding the left fro... |
H: How to convert 12v dc to smooth, as if coming from a battery, 6v dc (EMI – RFI free)
I’m an electronics newbie. I did a very simple project. In order to convert 12v dc to 6v dc I used one of those step down converters. Unfortunately what I’m trying to power is an AM radio. It power on without a problem but is compl... |
H: Does a hole through small gauge wire affect current and voltage to the source?
I put a hole with a staple trough a small wire (with the black stripe).
The line is coming from a solar panel, so not sure if that changes things....?
How will this effect current and voltage?
AI: Depends if you damaged the conductor in... |
H: Correct circuit element alternative to transistors
First please see my proteus file to understand what am I trying to do.
http://www.docdroid.net/ru27/yenitasarim.pdf.html
As you see, there is 5 button groups vertical and 5 button groups horizontal.
Each button group has 4 buttons. Assume that each vertical button ... |
H: Amplify speaker with 9v battery and one transistor
I started electronics recently and I'm trying to make the most basic mp3 amplifier. I try to amplify the music from my phone to the speaker. My phone already amplifies the sound when I connect it directly to the speaker.
I saw that people mostly use lm386 chips but... |
H: What are the capacitors between 5V and Gnd for?
In this article:
http://playground.arduino.cc/Main/MAX72XXHardware#Wiring
In particular the circuit of interest is:
http://playground.arduino.cc/uploads/Main/MAX72XX_Schematic.jpg
Functionally, capacitors resist changes to voltages. What is the advantage of this in t... |
H: Shared bias voltage for quad op-amp
I'm pretty inexperienced in EE, but I'm adapting the circuit given in this question to amplify microphone inputs to drive an ADC.
I am going to be driving 4 ADC channels (on a Beaglebone Black) from 4 microphones, so I'm planning to use a quad op-amp.
The upper left of the cir... |
H: channel seperated communication in RF
In RF communication the carriers such as 950MHz, 133MHz are available under 1 GHz. If there are 50 devices using the for example 433MHz carrier, then how could large number of devices talk to each other? Wouldnt their communications be disturbed?
What is the limiting factor f... |
H: Measuring voltage between two points...wirelessly?
I want to measure voltage between points A and B. Let's assume that there's some obstruction/difficulty in simply attaching cables between those points. Is it possible to measure the voltage wirelessly somehow?
I had an idea of a device that measures voltage at som... |
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