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H: Analog video surveillance camera motion detection feature
For example Samsung SCB-2000PH Specification PDF has motion detection feature. For what purpose it is in analog camera? That camera does not have any output pins/connectors, that can trigger some output signal when motion is detected. And if I am correct, th... |
H: MSP430 RAM protection
I'm looking at the user guide for the MSP430x5xx family. It says there in section 9.1 that:
The RCCTL0 register is protected with a key. Only if the correct key is
written during a word write, the RCCTL0 register content can be modified.
Byte write accesses or write accesses with a wrong ke... |
H: Supercapacitors vs. High Voltage Capacitors with Inductive loads used in CoilGuns or Solenoids
I'm looking for some insight on whether an 1000 Farads at 2.7v or 5.5v would be more effective than say 10,000uF at 400v-450v when creating a strong magnetic coil. The intent is something similar to what I find when exam... |
H: Opamp comparator output interfacing with digital circuit
I want to use Op amp as a comparator to shape the 50Hz sine wave to square wave, then route it to the PLL reference signal input, the PLL chip is 74HC4046. And i use AC coupled method. Because the supply of the Op amp is +/-15V, but the output signal amplitud... |
H: How to drain power with pins for led matrix on atmega32 instead of using a led driver
I want to make a led driver without the tlc594 series.
I use the atmega32 of which I can use 1 PWM pin.
The PWM pin will be connected to the base of the transistors.
With the PWM pulse I can dim the leds.
My question is how to con... |
H: Toggle transistors with an shiftregister to light up an LED
First of all I'm quit new to electrical engineering. I had it 3 years in class but I didn't do well.
So here is what I plan. I got some shift-registers (74HC595) Which I'll set with an arduino mega 2560. With this I'd like to light up an LED. First I thou... |
H: Short-circuit xPyS LiFePO4 batteries
I have a LiFePO4 battery connected in 2P4S configuration. What happen if one of the batteries is short-circuited? The other batteries will also be short circuits, or this will be result in the venting of one battery?
update:
Thank you for the answer, but the batteries are connec... |
H: Solder mask for 0.5mm pitch TQFP
I'm using Atmel SAM chips and the data sheets don't have any mention of solder mask clearance for their TQFP packages. What would be a nominal pad/solder mask opening/cream size for a 0.5mm pitch package?
AI: You should ask your board house what they need to account for registration... |
H: Why is the chassis used as ground in automotive electrical circuits
Automotive electronics generally use the metal chassis as the negative ground connector for the DC circuits. Obviously this saves something on wiring. Is there an electrical reason for this approach?
(I am not asking why negative instead of positiv... |
H: PIC16F628A Blinking LED
I was setting up a PIC16F628A for a simple Hello World program (blinking LED) and somewhere in the process, I have failed. The LED stays lit at the specified pin and does not "blink". I am using the Internal Oscillator (which resonates at 4 MHz). This is my code (Using the XC8 Compiler):
#in... |
H: Multiple out signals with single clock
Here is the deal..
I need to transmit data to 8 identical components.
Each component has a clock and an input signal.
MCU only sends data. Components only receive data.
All 8 components are the same and receive the same 366 bit stream format (only with different values)
All ... |
H: Super fast magnetic field by an electromagnet?
Was wondering about the possibility of creating a magnetic field in milliseconds or less? I know it's possible based on certain labs achieving 60-100 Tesla and more. But what about creating a 2 - 5 Tesla magnetic field in milliseconds? How much power will be required? ... |
H: Writing flash on ATmega328
I have struggled to understand this code but I can't understand the little endian for loop. Why is it necessary? And how could I read the page back? One byte at a time as an array? Is it even possible? Code from here
#include <inttypes.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.... |
H: MSP430 Timer A interrupt flags are wacko
Trying to setup a timer on my MSP430F5529 that should interrupt after approx. 2 seconds.
My initial setup looks like this:
TA1CTL = (TASSEL_SMCLK | ID_DIV8 | MC_UP |TACLR | TAIE | TAIFG);
TA1EX0 = (TAIDEX_DIV4);
TA1CCR0 = 0xFFFF;
TA1CCTL1 = (CM_NONE | CCIS_A... |
H: Microcontroller PWM to bipolar push-pull amplifier issues. (level shifting)
I'm trying to design a circuit that allows a micro controller (arduino) to control a voltage to a load. The load voltage needs to be bipolar in nature (+- 3 to 5 V) for use in controlling a TEC.
My current design idea is to take the output ... |
H: How does this SR latch work?
At first, I have to say, I'm not in Electrical Engineering, I'm studying for Computer Fundamental, and this question popped up, after a while considering, I decided to post it here.
I found some "quite similar" topics when posting this, but can't understand at all. Maybe because the OP... |
H: Sync filter in a lock-in amplifier
I've got two questions:
What does a sync filter in a lock-in amplifier?
What are pros and cons of using it?
AI: I think you should take a good look at a thorough description of a lock-in amplifier.
Here is one
Short summary: A lock in amplifier synchronizes its own output to the... |
H: Charge condition of lead acid battery
I need to monitor the charge condition of an 8V lead acid battery.
For monitoring purposes, I used a Beagle Bone Black (BBB) running Linux. It is also supplied via this battery. The battery also supplies three DC motors (switching on and off) and a camera.
Now if the charge fal... |
H: Difference between overload and short-circuit protection
What is the difference between overload and short-circuit protection for motors? I do not understand the need for SC protection when a motor has overload protection. Shouldn't the overload protection trip under SC conditions (and really fast due to the invers... |
H: How to explicitly connect hidden pins in eagle?
I am working on a project where I used a shift register 74HC595N which has hidden GND and VCC pins in Eagle. So I used the invoke property as shown in the pics, and connected the VCC and GND to the +5V and GND of the Arduino board. This connects the two hidden pins o... |
H: Why solenoid valve when a liquid pump can be electronically controlled?
In some quick research online, I'm often seeing configurations where a liquid pump is used in tandem with a solenoid valve on the same liquid path.
So, let's say I have a very simple scenario: a standard pump transporting liquid from one contai... |
H: How to measure current practically in a circuit
I have to measure this circuit, I have done the theoretical calculations using Kirchhoff's 2nd law, but I'm having troubles in measuring the current in each part of the circuit:
I have to measure current in I1, I2 and I3 practically, so where I need open the circuit t... |
H: Strategies for powering an ATtiny micro controller and 40W peltier from mains
I'm trying to power an ATtiny1634 at 5VDC and a 50W peltier element at 12VDC. The microcontroller will, amongst other things, turn on the peltier via a 5VDC non-latching relay. I want to use an embedded SMPS that will convert mains power ... |
H: 8V AC signal into 3.3V digital input pin
I'm a noob and I'm doing this to learn, basically.
I have a typical old-style door bell with a transformer that outputs 8V AC, the wire the goes through the push button on the door and finally hits a solenoid-based ding-dong thingy.
I'd like to tap into this circuit and extr... |
H: How can I make a decent ground plane in Eagle?
I've made a couple of simple PCBs as a hobbyist, and for the first time now I want to add a ground plane pour but I'm having some issues.
As I have currently understood I need to:
Create a polygon along the outline of my board with the polygon tool
Rename it to GND
Se... |
H: Inductor calculation for DC to DC converter
How can I calculate the value and characteristics of inductor in a DC to DC converter?
AI: A really great walk-through on DC-DC converter (Buck topology specifically) design calculations can be found at this Microchip Technology's web seminar slideshow. The seminar covers... |
H: Adding more LEDs to a current regulating circuit
I am modifying a current regulating circuit that was designed to power three LED lights (see figure below). The circuit is designed to maintain current through the LEDs at 1A. The LEDs should be off when no PWM signals are input (the PWM signals are sent by an Arduin... |
H: Identifying a part from game console controller
I need help identifying the following part. It came out of an old console game controller. It's labeled "SUP A9 103J". Googling it did not help. It's got ten pins and it was soldered into a space labeled "x9". I think it's some sort of crystal, but I'm not sure.
AI: T... |
H: The right way to read a circuit
I can easily understand these simple circuits:
or
but I can't wrap my head around this:
Not (A AND B) is all I get, but there is still a logical sum at the end (OR) and I have no idea where to put it
but for this, I can understand:
Not (A AND B)
AI: I find it helpful to work rig... |
H: Circuits in audio amplifiers to protect speakers
I hear that there are at least two kinds of circuits in modern audio amplifiers solely for the purpose of protecting the speakers against excessive loads on powering on and off.
Particular function of these circuits is delaying the connecting of speakers so long that... |
H: Creating an adjustable output regulator, in LTspice
Firstly, I'm having some trouble with simulating a variable resistor in LTspice.. I am wondering if this can be done?
Also, does anyone have any advice on how to theoretically analyse this circuit? I mean, the data sheet gives a formula for Vo but I think it's a l... |
H: Short circuit protection for high current wearable: fuse, polyswitch, TBU, circuit breaker, something else?
I am thinking about design elements for a rather high current, battery powered, wearable application. Maximum current of 40A at 5V, but typically around a third to a half of that.
Power would come from RC car... |
H: Which NTP server should I use for my product to update time?
I am developing a GPRS enabled embedded device.To synchronize time with the network I have to use NTP protocol.
The nature of the product is such that I have to Hardcode the NTP server address inside the firmware and I cannot change it in future by any me... |
H: Can I swap any two lithium cells on an MP3 player / camera, etc?
Lithium batteries commonly have +/- and temp monitor connections. I'm pretty sure I can swap a 290 mAh MP3 battery with a 1400 mAh battery, it will charge very slowly.
Can I swap the temp sensor around on the two? Are they standard resistances / volta... |
H: What causes inaccuracy over time on a DMM?
Here is a piece of information from a datasheet of a DMM. The accuracy rates seemed interesting for me. I wonder what causes difference in the accuracy, especially the changes after 24 hrs? Is it only shunt related, or another components related issue?
Second question, wha... |
H: Gain vs. Directivity and effect of animal body to Antennas
My design works in a foresty area inside a collar of an elephant. These areas have at least -110dBm GSM strength (accurate ref. map linked) but, usually higher as I live in a small country where GSM coverage is easily provided.
Following is an excerpt from... |
H: Design a 3-to-8 Decoder Using Only Three 2-to-4 Decoders
Using only three 2-to-4 decoders with enable and no other additional gates, implement a 3-to-8 decoder with enable. The inputs of the resulting 3-to-8 decoder should be labeled X[2..0] for the code input and E for the enable input. the outputs should be label... |
H: Step up transformer for low frequency AC with DC offset
What is the best way to step-up a low frequency voltage with a DC offset?
I have the following signal coming from a function generator:
\begin{equation}
V_f(t)=8 Sin(2\pi f t+\phi) + 4
\end{equation}
Where:
$$(5 \leq f \leq 100) Hz$$
The desired output is:
... |
H: Relationship of antenna size to gain and directivity
This question is derived from certain answers I received for a previous question I posted.
Case : Let's say I have two GSM antennas of the exact same shape, design and material. The only difference is that one is 10 times larger in size than the other.
Question... |
H: What is this power supply connector and why was it likely chosen over a 12V DC?
This is from a 3.5" hard drive enclosure that I am tempted to throw away since I don't have a plug. What likely influenced the design choice to use this sort of plug? The hard drive itself likely takes 12V DC as that is what a computer... |
H: Catch both sides of a clock change PIC interrupt
I am trying to build an IR remote receiver using a PIC16F628A. To do that, I need to catch both the falling and rising edge of the external interrupt pin. From the datasheet it appears you can only receive an interrupt on one or the other edges. How would you recomme... |
H: Passive Filter Negative Insertion Loss
Can someone please explain to me how a passive filter could possibly have a negative insertion loss? In the attached picture, this can be seen in the C or D curves where the insertion loss dips below 0 dB. I understand the filter is resonant at this frequency, but I don't unde... |
H: MATLAB - FFT aliases occur sooner than expected
I'm using Matlab to analyze the frequency spectrum of a sample wav file. In the frequency plot, I'm seeing aliases occur however they appear sooner than I would expect.
Here is the frequency plot:
Just using some quick calculations, the middle point of reflection ... |
H: Variable output PSU switch configuration
So I am designing a switchable voltage 9V/18V power supply and was wondering, what's the best way to switch between outputs, that's the current schematic I came up with:
Original image size
So my question is, will this work and is this the best way or is there a better one?... |
H: Complex numbers manipulation
I have a complex number s of the form s=[1/sqrt(NN\$_{t})] e^{j\phi_{k}}\$ S\$_{o}\$ is another complex number. It is given that |s-s\$ _{o}\$|<= \$\epsilon\$ where 0< \$\epsilon\$< 2
It is stated in the literature that this constrain can be written as
$$ \phi_{k}=\arg s \in\left[\... |
H: Mixed analog-digital power supply
I'd like to build a project where I'm essentially controlling analog signal generation in the audio range from a microcontroller. In other words, an analog synth with digital control. I'm at the stage where I've prototyped and tested most of the core circuits on a protoboard, using... |
H: How does "bidirectional" transmission on gigabit Ethernet work?
I was reading about the various twisted pair protocols, being distracted by the marvels of Wikipedia when I went to look up the way to wire a connector.
And I'm wondering how it can transmit in both directions at the same time over the same conductor? ... |
H: Minimal Hall effect sensor circuit to keep something off after certain RPM achieved
I have a somewhat limited understanding of electronics and circuits. I'm trying to build a circuit that will keep a transistor in an off state after a given threshold of RPM is achieved using a A3144E Hall effect sensor.
For example... |
H: 64bit vs 32bit processor execution equivalence
I'm not sure if I am in the good site but here's my question :
I was questionning myself, what would be comparable(execution speed) between a 32bit and 64bit processor. Like what would be the clockrate of a 32bit processor to be as the same speed as a 64bit processor... |
H: Logic circuit with not gate-stability
simulate this circuit – Schematic created using CircuitLab
Why is the first circuit unstable and the second one stable?
AI: It is easy to go through these circuits. Lets say that on the left side of the first inverter is a logic value of 1. This value is inverted and is 0 at t... |
H: Series and parallel transformers?
I have two different transformers. The output of the first one is 15 volts and 1500 mA. The output of the second one is 5 volts and 500 mA.
If I connected them in series (to get 20 volts) what will happen to the current?
If I connected them in parallel (to get 2000 mA) What will ha... |
H: What battery to choose with motors?
I am trying to figure out how many batteries I will need, in order to power my 4-wheeled robot (based on an Arduino). I understand that it is not practical to power the Arduino and the wheels with only one 7.4 V LiPO battery. So I know that the Arduino power source is going to ha... |
H: Effect of non-inverting op amp on the AC and DC components of the input
I was wondering what the effect of an op amp like the one in the image below is for an input signal such as \$0.5\sin(2000\pi t) + 0.5\$ V? Are the DC and AC components amplified with the same gain? And also, what would be the phase relationshi... |
H: Electrical measurements of Chicago substation from where can I get it?
I am doing a project on electrical load prediction using machine learning. Machine learning involves creating models based on past data. For creating these models where can I get data regarding electrical measurements of Wider Chicago substation... |
H: Component selections for the ETA3406 DC/DC converter
I was browsing Seeed Studio's Open Parts Library and found the ETA3406, which is a 1.5 MHz 1.2 A Step-Down Converter.
It's pretty cheap, and looks very useful for something I want to build, but the datasheet only shows it using a 2.2 µH inductor, which curiously ... |
H: Simultaneous Buck-Boost or Flyback Regulator - Help Selecting Chip
I have been trying to find a switching DC power supply that outputs a constant voltage of 12VDC, given a variable input between 4V and 25V. It's to my understanding I'd need a buck-boost converter, but many of the buck-boost converters I find on Dig... |
H: Child-Safe setup for ESD protection environment on desk
I need to setup an anti-static workbench in my spare office, and kids sometimes get into it ever since they learned how to pick the locks.
My intended approach is to:
Lay out an ESD mat on the desk.
Punch a whole through the mat, and connect an ESD common p... |
H: Mic Amp Mixer and Audio Distribution, Won't Work! Help! (Update 2) (Solved!)
I'm new to this forum and I really don't know much about Audio Amplifier Circuits. Hope you can help me.
Here it goes:
So basically what I'm trying to do is a circuit that mix 3 channels, amplifies them and then distribute them into 3 ch... |
H: Where can I find common circuitry implementations of different computer system components?
Mostly out of interest, I'm trying to understand common circuit-level implementations of computer components. I understand that implementations may differ widely, but I'd like to see examples. It would be great to see a lot o... |
H: What's a probable VA rating for this?
I bought a variac at a garage sale a few months ago and I've played with it since then with a 40W incandescent desk light. Now I want to use it for the incandescent house lights in a small theater. About 1000W total at 120V.
I don't have any official specs. Any guesses on ... |
H: Adding hysteresis to MOSFET used as a switch
I have a low-voltage detection circuit which I use to trigger one of two LEDs (green, and red) that is powered off of a +9 V battery cell. As the battery discharges, its output voltage decreases, until when it finally hits the 6.9 V level. When the battery provides an ou... |
H: Decoders and Logic Gates
I have two questions. First, I've been staring at this problem for over an hour and I'm stumped. To be clear, I'm not looking for the answer, just some hints to get going would be helpful:
1) Using only three 2-to-4 decoders with enable and no other additional gates, implement a
3-to-8 de... |
H: OP amp voltage comparator for an FET
I have a project requiring a switch (I supply 4.8V, the switch stays off. I supply 5V, it turns on.) After some testing and asking several questions, I realized that the MOSFET I was using would not cut it. In EE.SE chat, I was informed that a comparator could solve my problems.... |
H: Why does this circuit oscillate and produce sound?
I've connected an 8-ohm speaker in series with coil. When I apply 5 volts / 500 mA to the combination (coil and speaker), I heard a very high frequency sound (something like whistling).
The coil is not air-cored (I think the core is made of ferrite or iron) and it ... |
H: Transformer calculations and physics
I have an electrical engineering academic background, but since graduation, I have worked exclusively in software and my EE skills are admittedly getting very rusty. Something I never fully understood was circuit analysis with transformers.
I understand, at the simplest level an... |
H: Using GPIO mode in SIM908
I'm working on a SIM908 module using GPIO mode (my rx pin contact is lost when soldering).
I have interfaced it with a PIC16F73 and while using GPIO mode I'm not getting any response. I have included an LCD to print the response. Is there any AT command or pins I should enable on SIM908 to... |
H: Low-power dual-rail ADC
I am building a battery monitoring device and planning on measuring voltage drop across a current shunt, amplifying, and reading into an external (12-bit) ADC chip to get a value of the resolution I desire.
The problem I am requesting help with is finding a low-power ADC that accepts +- volt... |
H: SPI reading from slave
I have small question about how bytes move around during SPI reading.
I have a flash memory chip and microcontroller.
Suppose I want to know jedec data from the chip(although it can be any data, this is just example), I found how to do it and it works fine, but I don't get the part when we as... |
H: Switch Vcc to Ground with a control bit
I have a device that is 1 ohm and it consumes 3Amp. I want to run my device in both ways and I have only one voltage supply. I want to switch ground to Vcc and vice versa with a control bit from mcu. I considered cmos invertes, but I am not sure if the resistance of cmos inve... |
H: Best microcontroller for industrial applications
I have an industrial project requirement to build a device having this functionality:
Store Data
Send Data to Web Server
Device to be placed under scorching sun
Sensors - around 5
A Graphical Dashboard
RFID authentication
Buzzer
And maybe a couple more. I am tota... |
H: Transformer current peaks
So I am designing a power supply, got everything calculated, and decided to simulate it for a second to see if the smoothing caps keep the voltage above the regulator limit at max current draw. What I noticed, that the current through the transformer peaks to nearly 2.5 amps when the cap i... |
H: Why is my instrumentation amplifier's output voltage completely wrong?
I'm trying to amplify the voltage of my load cell (Wheatstone bridge I believe), but my calculated values are not the same as my experimental values.
The load cell outputs a differential voltage of 0.1mV - 5mV (measured with a voltmeter), and I ... |
H: Is it possible to step-up the output of a laptop USB port to 12 watts?
I've got a USB device that requires 12 watts to charge.
My laptop appears to output less that that.
My question is: Is it possible to step-up the output of a laptop USB port to 12 watts?
AI: No. This is basic physics. There is no free lunch ... |
H: MOSFET current mirror: Saturation mode?
I have some trouble understanding why M1 is in saturation/active mode.
According to Wikipedia a MOSFET is in saturation mode if \$V_{GS} > V_{th}\$ and \$V_{DS} \ge (V_{GS} – V_{th})\$.
However as drain and gate are tied together \$\implies V_{DG} = 0 \implies V_{DS} = V_{GS... |
H: How does the drain current flow in a MOSFET when the channel is pinched off?
Here is what I have understood. Please correct me if I'm wrong.
The depth of induced channel depends on the voltage V. Since the voltage across the gate and the path along the channel decreases from Vgs at the source to drain end to drain... |
H: How do I find the voltage range for an unknown DC motor?
I have a small unmarked motor with a burned out speed controller board. I'm able to figure out that the motor is a DC motor because it has two wires coming out of it and there's a rectifier on the speed controller.
I want to find out what is the maximum volta... |
H: What to do with transistors I had desoldered from TV
I am a beginner in electronic design and want to learn about transistors.
I have an old TV and I decided to de-solder the following transistors.
Can you tell me what I can use them for, are they all the same, and if anyone has some literature where I can start,... |
H: Comparator input interfacing
I need to digitize a weak (-10 dBm) 1-20 MHz signal with a comparator. The output of the preceding stage is 50 ohm.
The comparator I'm using is the LT1715. It's input trip point is ± 5 mV and the bias current is -2.5 µA (-6µA max). Is it correct that the bias current is the current the... |
H: Is a 75 KHz 12V peak signal suitable for LM324N?
The LM324n has a gain-bandwidth product of 1 MHz, so I guess it works from 0 Hz to 1 MHz, is what I understand true?
Its slew rate is 0.5V/us which means that it can generate a 500 kHz output signal, is that true too?
If the above are both true, why when I apply a 7... |
H: Unexplained behavior pic port b on change interrupt
I am trying to configure the port b interrupt on change interrupts to work with a program I am writing with MC XC8 demo version. I am using a PIC16F628A I am using this code to initialize the pic for interrupt reading. However it seems when I start up my program... |
H: Creating a home made ultrasound transducer
I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D printer make it possible (to print parts)?
I don't understand why they cost so ... |
H: Compromise needed combining virtual grounds
This is a long story for which I hope my proposed solution to a problem I've created will be a stable one. But op amps can surprise you, so let me explain. The circuit is large and complex, so I'd like to avoid posting it in favor of discussing the key issue I'm focusing ... |
H: Using bench power supply to drive ex-cordless driller
Ok, so I perhaps naively thought I was the first person to ever think of this - go figure.
Anyhow I managed to get my hands on a couple of cordless drillers which have an expired battery and thought that if I added a power jack (socket) to one of the drillers I ... |
H: Voltages with an earth ground
In this diagram, from what I understand the voltage between the positive terminal and the first earth ground is \$ 0V \$ and the voltage between the negative terminal and the earth ground is \$ 0V \$. So why then would you do this earth grounding? In what situation would the current ... |
H: Why conceptually we connect circuits to earth but in reality that doesn't really work?
This question is best seen with an image:
Above we can see two equivalent representations of a circuit, on the left side we have a voltage source closed-loop connected to a Resistance (R), and on the right side the open-loop equ... |
H: How can I solder this circuit board without breaking it?
I bought a current sensor (link). I would like to connect it to my project, and I was planning to do so by just soldering on copper wires.
There is a resistor on each side, with blobs of tin on each side to keep it in place. These blobs reach out to the pla... |
H: Strange problem with JY-MCU (HC-06) Bluetooth module
Short explanation: data sent over the bluetooth serial does not arrive correctly to the Arduino.
Yesterday I connected a JY-MCU bluetooth module to my Arduino UNO R3 to test it. I connected the TXD and RXD pins to Arduino pins 10 and 11 respectively and used Soft... |
H: Electric shock with isolated material in the circuit
I never understand why electric shock happens if I'm connecting to ground by isolated material.
Let's consider an example with monophase 220V electrical system electrical shock while I'm wearing rubber shoes and touching a stripped wire.
With this circuit an ele... |
H: When setting pin as input it getts pulled high, why?
I've hooked up a push button to GP1 and a LED to GP2 on my PIC12F683 and this is my code:
unsigned char i = 0;
void main() {
TRISIO = 0b00000010;
CMCON0 = 0x07;
ANSEL = 0b00000000;
while(1){
i = GPIO.B1;
if(i == ... |
H: Power Mosfet design issue
My schematic
The components
BSN20 is a N-channel enhancement mode field-effect transistor (datasheet)
IRF7416 is a HEXFET power MOSFET (datasheet)
This is a part of a project in which the line into R2 comes from the PWM of an ATtiny88 (datasheet).
The R2 is set as an output from the AT... |
H: Do I need OS for ARM Cortex-M0(3)?
I'm a developer of control devices for switch mode power supplies which need to generate a PWM signal(s) with a frequencies about 100 kHz, measure analog signals, communicate vie USART, make relatively simple calculations and so on. It is also important to start up fast and react ... |
H: Usage of WS2821
I got a buck load of WS2821a, and I was wondering, can I use it for something else than driving LEDs?
TechSpec: http://www.world-semi.com/uploads/soft/140305/1-140305102109.pdf
Can it be used for:
0-10v
Triggering solenoids
And how?
AI: By Using Transistors. Or Mosfets. The led Driving pins are ba... |
H: Logic gates. BCD Multiplication. Karnaugh maps (I think)
I have to draw minimum combination of logic gates that multiply any BCD number with a 7. Output is also in BCD. It probably has something to do with Karnaugh maps, that's how we do this sort of problems in class. I don't even know how to start.
AI: Truth Tabl... |
H: Can I use this relay for DC
http://www.dx.com/fr/p/ssr-25da-25a-solid-state-relay-white-134494#.VDmPWPl_uap
It says AC output but how can this transform DC to AC ? Shouldn't this act like a switch ? If my circuit is DC and I close the switch it will transform to AC or will it stay DC ?
AI: According to one review ... |
H: What material is comonly used as insulator in laminations?
I am trying to build a brushless motor for quadcopter use, with a semi-CNC lathe and a CNC mill.
I know I can buy a stator core on gobrushless or maybe other place, but I want to know if I am able to build the stator core also.
There is a place near where I... |
H: Why is my guitar amplifier acting like a radio when I touch the volume knob?
I just bought an acoustic/electric mandolin (Ibanez M511SE-DVS) that I decided to test out with the only guitar amp that I have (a Baja BG-10). It works fine, but I noticed that when I have my finger on the volume knob, I receive (what is ... |
H: Voltage Dividers in a pull-up resistor circuit (why does the pin go to low)
I understand that when the button is in its open state the voltage on the input pin should be fairly close to \$ V_{cc} \$ provided \$ R_1 << R_2 \$ as \$ V_{in} = V_{cc} \frac{R_2}{R_1 + R_2}\$. But, I do not understand why the voltage on... |
H: What happens when the voltage drop does not equal voltage rise in a closed series circuit?
New to electronics. Can't get my head around so many basic things but the application of KVL is bugging me the most.
I want to know what happens when Kirchoff's voltage law is broken. If for example, I have a 6V battery and a... |
H: What is the minimum voltage for general loads and peltier units
I am confused with "power ratings" on devices and electrical components.
First, what is the power rating on a home appliance or a electrical component saying when it is 12V? Is it saying "we would prefer a 12V power source"? OR "we need at least a 12V... |
H: Minimum voltage input for thermoelectric unit
Context: I am trying to make a drink cooler with a thermoelectric unit (peltier unit). I want to supply the minimum amount of energy as possible to the peltier unit. Now on my peltier unit, it says "15V" (and 68W). I am not sure whether it is recommended, minimum or max... |
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