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H: Component to detect the state of an external LED
I need to detect the state of an LED in a machine that I cannot connect to in any electrical way. So I would like to measure the light emitted from this LED.
The conditions:
The ambient lighting is low to very low (both the machine containing the LED and the sensing... |
H: Why does stepper motor not turn properly at different frequencies?
I have an 8 wire stepper motor and an unipolar motor driver. I wired the motor as unipolar connection. On motor 3.15V and 4.2A is written.
My connection is above. When I connect V to 24V 14A source to V, at 1 ms step, the motor (has 200 steps) rot... |
H: Using a Counter to Determine next MSB position in polynomial division
I am working on implementing a polynomial divider the operation is as follows:
Check MSB of Numerator:
if 1 XOR with Denom then shift Denom right
if 0 Num is the same and Denom also shift right
When doing the following shift for the Denom the new... |
H: How to detect several agents within a radius, what is the best and easiest way to do it?
I have a room with 30 objects which may or not be present, and I want to be able to detect which objects are in the room.
My first idea was to attach a RFID tag to each one of these objects and have a sensor detecting them, but... |
H: VHDL - Flip Flop inferring on a signal
I have to design a circuit to count up to a number and return to zero. It must have a carry signal (which I named a_o in my circuit) as flag to show that the maximum number of the counter has been reached.
The circuit is working fine, but it is inferring a Flip-Flop in the a_... |
H: Why doesn't the RMS current and voltage give me average power?
Apologies for the multiple bridge rectifier questions.
I have a 230V/9V 10VA transformer, and I want to know how much DC current I can draw from this circuit. From this I assume that the \$I_{rms\_max} = 1.1A \$.
I ran the simulation for various values ... |
H: Is it worth reusing old components
I find myself constantly trying to recycle old components in my new projects. Yesterday, I needed a demultiplexer so I just took it out from some old phone board...
Demultiplexers cost basically nothing and the one I took out is quite old. So my question is this:
Does it make sens... |
H: Diode detector strange discharging
I am building a diode detector circuit in order to detect ASK signal with 125 KHz carrier frequency and 8 KHz data rate. However, I realized I would say a strange behaviour and discharging of capacitor.
The setup is following:
Function generator set to sine wave 3 Vp-p and f=125 K... |
H: Two different MCU , different output but none was right?
I write this simple code to check my new burner :
#include<avr/io.h>
void main(void)
{
DDRC = 0xFF; //high pins
PORTC=0x00;
while(1)
{
PORTC=0xFF;
}
}
I use Extreme burner software to burn . My burner seems to work fine. It burn the code (said by the bu... |
H: How does the controller know when to jump to the ISR?
I am talking about things at the core level.
As far as I understand, the controller core just executes instructions which are fetched from the memory (Fetch - Decode - Execute). When an Interrupt arrives, how does the core/ALU decide to jump to the ISR?
Becaus... |
H: Replace crystal earpiece in bat detector circuit
I've been following the instructions on http://pw1.netcom.com/~t-rex/BatDetector.html which includes the following schematic for a Frequency Division Bat Detector circuit:
The instructions clearly state (http://home.earthlink.net/~bat-detector/SBD2Parts.html note #5... |
H: How do I determine the current load at which my buck regulator will operate in DCM?
I am using an TI TPS56121 buck converter and I have designed it to supply 4.6V at 5A. However, my load current can vary from 500mA up to 5A (the load normally runs at about 3.6A). How do I determine the current load value at which... |
H: What is the purpose of the thick blue line in this schematic?
On this schematic for a Z80 computer, there appears to be a thick blue wire connecting some components together. What is it? Googling yields no results: here is the schematic
AI: Yes, they are buses. The address, and the data bus.
They are basically a w... |
H: Reverse bias I-V characteristics of mosfet
What is the equation for a N-channel MOSFET's current value (\$I_{DS}\$) given a negative drain-to-source voltage \$V_{DS}\$?
I can find plenty of forward biased I-V curves for the N-MOSFET, but I haven't found any reverse biased ones.
AI: Basic threshold model--
It is in... |
H: How do I get the index of these word addresses?
We are given 32 bit memory address references.
For example:
180, 43,2.
We are asked to find the index "given a direct-mapped cache with two-word blocks and a total size of 8 blocks". Mind you have I have the answers. I am looking to HOW to get those answers.
The index... |
H: How to Monitoring the lines between an Atmega8 and a LCD using Atmega32
I have a device that it use an Atmega8 to send some data to a 2*8 character LCD. the LCD has 8 pins and the pins are as below from left to right:
DB7 | DB6 | DB5 | DB4 | En(Clock) | RS | VDD | VFF
I think it is a HD44780 with DB0...3 , Contrast... |
H: Ozone and electronic equipment
Hopefully this is the right community to ask this question. Does anyone know whether there is a significant chance that ozone at approximately 15 ppm will damage consumer electronics, speakers, keyboards, and lab equipment, such as a Tektronix scope, for example?
I'm very sensitive to... |
H: How do I interpret this thermal curve graph for my heatsink?
Datasheet of heatsink.
The heatsink says it's thermal resistance is 24K/W.
Let's say my device dissipates 5 Watts. Assume a perfect conduction from the case to the heatsink, and junction to case is 0K/W.
If I use the specified value, the heatsink should r... |
H: Connectors that protect wires from breaking when it is resonating alot
I am building a robot vehicle, that is resonating alot when it is in rough areas. Cause of this the wires in the robot will resonate a bit too. When this happens every now and then a 'vein' (tiny copper wire in the wire) of the wire will break o... |
H: Shift Register Vs Multiplexer
I am not sure about an implementation. I've a multiplexer 8 input, 1 output and 3 select signal. One of these selects signal sequentialy acquires all value of a bit vector. Now I can choose 2 way.
The first way is to use another multiplexer where the input is the bit vector and the sel... |
H: How does a cable tone-and-probe kit work?
A useful tool for someone installing electrical cabling of any sort can be a Tone and Probe Tool: it allows one to find individual leads among a possibly hundreds in a cable trunk, without having to either strip or connect the remote end.
With the tone generator part conne... |
H: How to attach an electronic enclosure to glass?
I'm developing a very small PCB that I'll put inside a small case that will be attached to glass, let's say for example in a car. Once you attach this to the glass, it should stay there for a long period, but should also have the ability to be detached and attached ag... |
H: Can different sources with same voltage output can drive different amount of current through the circuit
I started experimenting with electronic devices. While I was doing that I connected a DC motor to output of arduino which provides 5V. It could not provide enough amount of current. But when I connected the same... |
H: Role of Inductor in power supply section..?
I'm interfacing a TFT display with MCU which requires 450mA current & 3.3V.
In power supply section I have used regulator ICs to get 5V & by using two diodes I'm getting 3.3V. For filtering in power supply I have used inductor.
but the display requires a 450 mA current wh... |
H: How would I properly develop a current rating for this system...?
I have a system that I have recently developed for in house (manufacturing) equipment testing. Transformers rated for 80VA (264V, .303A) are used in series and rectified using a full-wave diode bridge. The signal is leveled out by capacitors to produ... |
H: Verilog: Check, if a signal is 100 ticks active?
I have one input and one output. And I want to turn the output to 1, if the input was 100 ticks active (100 cycles).
module check_100(
input wire clock,
input wire reset,
input wire in_a,
output reg out_a);
reg[10:0] counter;
always @(posedge clock... |
H: Send integer values through serial communication in PIC to PIC?
I need to pass integer values from one PIC to another through serial port
for char I can use the following code
char data1='a';
TXREG=data1;
while(PIR1.TXIF==0);
but when I try to pass int type variable it return... |
H: Do we know what a radio wave looks like?
In precalculus class, we are learning about sin/cos/tan/cot/sec/csc and their amplitude, periods and phases shifts. I've studied electronics on and off for about a year. I would like to know if we actually know what waves look like. Do they actually look like the sine and co... |
H: Wireless Home Automation 2.4GHz versus 433MHz
Project specifications
- This is an **Arduino** project
- This is supposed to be internationally applicable
I am working on a home automation project which might go into smaller production. The project is wireless and the connections would be managed as followed:
You... |
H: How to resolve this Syntax error
Am trying to code a top level module that would connect different modules to make an up/down counter that would display a hexadecimal character on a 7 segment LED on posedges; but every time I try to run the following top level module I get an error that says
'Line 25: Syntax error... |
H: Switching frequency of a solid state relay?
I bought a SainSmart 4 channel solid state relay recently. I am planning to use an Arduino to control some Christmas lights I've put up around my home. My question is: How fast can you switch SSR's on and off? For example, what if I want to have a string of lights flash, ... |
H: How differential pairs should be called out on fabrication print?
I have a design that the diff-pairs (100 Ohm impedance) and single-ended (50 Ohm impedance) are routed on the same layer. To specifying the impedance, on the “Lamination Stack-up”, I am going to add the information like this;
INT1 (TW=0.006” Z0=50 oh... |
H: Using distribution transformers vs direct connection to primary switch gear
I am trying to learn more about transformers and low voltage electrical distribution.
Say you have a medium sized industrial building with a primary switchboard feeding several load centers elsewhere in the building feeding localized loads... |
H: using AD620 with load cell
I am currently using an AD620 to amplify the signal coming from my load cell. I am supplying it with single supply of 5V and 0V. Below is my preliminary circuit.
I am feeding half the supply to the reference pin so i am getting an output of 2.5V to 3.7V. I also tried feeding the reference... |
H: Linear Power Supply Advice
I am new here to StackExchange and new to electronics in general. As my second electronics project (the first being a blinker circuit for a bandolier of LEDs) I am building a regulated linear power supply.
The specifications for my power supply are mostly dictated by the components I have... |
H: PIC32 Configure PPS for SPI CLK
Well I'm struggling hard with this, been at it for 2 hours so far. I should have stuck to my TI parts :)
Anyway I have a board and I'm trying configure the PPS to bring the SPI peripheral out to the pins. Actually I'll use it in I2S mode.
So the part is a PIC32MX210F016B and the SC... |
H: Multiple DTMF circuit interfaced to one microcontroller, will it work?
I already tested this circuit with only one modification, I changed the R2 to 300kOhms which worked in my case.
I interfaced this circuit to a microcontroller where they shared a common ground. I successfully read the telephone number of the c... |
H: Adding two signals and finding the RMS and Peak to peak value of the output signal
I would like to start by saying I have been solving exercise related to Op amps and how to find RMS values and Peak to peak values. But I got stuck on this exercise.
Basically, two signals has to be added.
U1= 4v
U2= 2vsin(2*Pi*f*t)... |
H: Schottky Diode disadvantage as compared to usual diode
Schottky diode have a low forward voltage drop (typically \$0.15-0.45V\$) and very fast switching action, as compared to traditional diode, which typically have a \$0.7V\$ voltage drop (Silicon diodes). What is then the advantage of traditional diode as compare... |
H: Low Pass Filter With Hall Effect and ADC Help
Background:
I am using the Allegro ACS758KCB-150U hall effect based current sensor, here is the datasheet, I am using it to measure current drawn by 24V motors, between about 20A - 130A. The reason I need to measure the current is to get a general trend of how hard the... |
H: Class B power amplifier
In this circuit from (Grey,Meyer Analysis and Design of Analog Integrated circuits fifth edition) It is stated that : "In the quiescent
condition,\$ V_o = 0\$ and \$V_1 = 0\$ ."
What forces V1 and Vo to be equal 0 when \$V_i =0\$ ?Aren't there other sources (\$V_{cc}, -V_{cc}\$) which may c... |
H: How to connect 2 3v3 lines in parallel from different dc/dc converters?
Is there any way, to connect 2 different (but same output voltage) dc/dc converters? One of them works on 5 to 40 Volts, and one on 3 to 5.
AI: If your application can tolerate a small resistance in the power circuit then Voltage Regulators wit... |
H: Limiting current draw on a camera battery charger
I have a camera battery charger which is driven from a 12V (measured 12.2) switched mode wall wart rated at 1A. All three items (charger circuit, wall wart and battery) are stock, but all three heat up pretty quickly, which got me worried. The items work - the batte... |
H: Soldering my own CUL sender/receiver
I have been thinking of starting a new home project: I want to automatize some stuff at my home, starting with the heating. To do this I looked at the FHEM project. All looks pretty good and interesting, but I realized quite early that I needed a small device to send and receive... |
H: PIC32 How do I find group number for peripheral
From my last question I made a mistake on thinking SCK was under PPS control. I see that now but I still don't understand how to figure out group number for a function with PPS by reading the datasheet.
Let's say I want to bring out MOSI, or I think that's SDO2 in PI... |
H: PIC Microstick vs Pickit
I am starting new in using PIC MCUs and am slightly confused by these two available options.
Pickit is a programmer/debugger, that's what they say. Now, there is this something called Microstick which is a ready-made development board with an inbuilt programmer/debugger. Microstick seems t... |
H: Can I use this power supply?
This may (and probably will) sound very silly, but I rather ask first than destroy my childhood memories - I found my old sega mega drive at my parents home, but it had no psu. I knew I had some psu's laying around at home so I found one that supplies 5V2A, but the console requires 10V1... |
H: Circuit for a coarse and fine setting potentiometer?
I've tried to find a circuit for a coarse and fine adjustment (two potentiometers) voltage divider, but I don't understand it and/or they don't have a linear response.
Problem: I want to have an adjustable voltage from 0 - 5V using two potentiometers, one for coa... |
H: SPI Clock Frequency changes when level shifted
I'm using Adafruit's TXB0108 bi-directional 8 channel level shifter with my Arduino Uno. The SPI clock from Pin 13 is level-shifted through the first channel of the level shifter. Measured with my multimeter, the frequency of Pin 13 is 3.439Mhz. However the measurement... |
H: Serial Servo Control using PIC
I am trying to make a serial servo controller using pic18f4550 microcontroller.
following if the complete code that i've tried..
please note that i'm currently sending 8bit hex to control only one servo.
i'm sending this data from one pic to another..
#define FREQ 20000000
#define bau... |
H: Is interfacing the 5V TTL UART with 3.3V microcontroller via voltage divider possible?
I need to connect my MSP430 microcontroller (3.3V) to interact with a 5V TTL UART camera (http://www.cn-lcf.net/sdp/561974/4/pd-2909996/7575433-2127043/LCF-23M_OV528_Protocol_RS232_Camera_Module.html).
In order to do that I came ... |
H: Using 25 IR LEDs with Raspberry Pi and Transistor
Using a Raspberry Pi and 5V I want to use 25 IR LEDs (5mm LED, 940nm wavelength, 20 degree beam width, 100 mA continuous, 1000 mA pulse, Approx 1.6V forward voltage; http://www.exp-tech.de/super-bright-5mm-ir-led-25-pack) in parallel using 8 pairs of 3 LEDs each pai... |
H: Improving RF sensitivity
I'm trying to improve the range on my 433 MHz radios that are using the CC430F5137.
Based on 25.3.3 in http://www.ti.com/lit/ug/slau259e/slau259e.pdf, it seems like decreasing the RX filter BW can improve radio sensitivity. I looked over TI's DN005, DN015 but I didn't see an explanation wh... |
H: What are the differences between mini, sub-mini, and ultra-mini switches
Apologies if this isn't the appropriate SE for this question. If not, any pointers to a more appropriate place would be appreciated.
I'm looking to swap out some toggle switches on a R/C controller. I'd like to be able to shop online for the n... |
H: How to read a push-pull output
I recently came across a sensor that had a "push-pull" output. I can't find anywhere how to read such an output:
Is it some particular kind of analog output?
I would want to read it with the MSP430G2553 (using energia or code composer).
AI: Just connect it - and only it - to the MSP ... |
H: DC/DC converter/eFuse maximum output capacitance
I have some doubts about the design of this DC/DC converter circuit/PCB circuit:
On the left side there is a 400V to 12V DC/DC converter (Vicorpower DC/DC Mini, 300W). The maximum output capacitance of the converter is calculated with 833.3µF. (Datasheet: "The capac... |
H: How to switch between two input lines based on a digital pulse
How can I switch between two inputs based on a digital signal. I would like to have the Input 1 connected to the Output for the duration of the pulse and Input 2 connected to Output when the signal goes low.
AI: You can do this with 2 ICs and no MCU. I'... |
H: Is it possible to connect more than one device on the same SPI?
Is it possible for someone to connect multiple sensors to the same microcontroller's SPI or I2C port?
If it's possible, how would someone alternate between devices?
AI: SPI:
The master can work with slaves in two modes: with independent slaves or coope... |
H: Do MOSFETs have voltage drop across source and drain when turned on?
Like diode and BJT having around 0.6V drop, is there any voltage drop across the MOSFET drain and source when the MOSFET is turned on? In the datasheet, they mention diode forward voltage drop, but I assume that it for the body diode only.
AI: The... |
H: is CFM additive?
I currently have a heatsink with 1 (loudish) 1000-1500 CFM fan.
If I was to put 2 quieter 500-750 CFM fans on either side of the heat sink, would they effectively push the same amount of air? It is a vertical heatsink.
current flow is -->||
was thinking dual flow to be --->||<---
AI: When a fan ... |
H: What is the name of a component that combines a switch with a variable resistor?
I had some lights with a rotating switch that would turn them on/off, and then continuing to turn the switch would make them brighter. What sort of switch is this called? (it had a physical "click" to it between switching on and off).
... |
H: Using PIC32 Flash for storage
Continuing along on my PIC32 adventure, and using my PIC32MX210F016B. I have some configuration data for another IC that I have to program over SPI. I want to store that confurgation data, about 2K in the PIC flash. I'm not to clear how to do that though. I was trying to find so... |
H: Charging li-ion batteries with protection circuit
If i'm using a protection circuit like this one:
http://www.batteryspace.com/pcbfor148vli-ionbatterypack5alimitwithfuelguagesocket.aspx
and 4, 3.7v li-ion batteries.
Can I use a simple 16.8v dc wall wart to charge them?
or do I still need a special li-ion battery c... |
H: How can the value of a resistor be measured if it goes straight to ground?
I'm looking to integrate a LiPo charging circuit into my PCB, and found the MCP7831 IC. It's got a PROG pin, that allows you to change the behavior of the IC by use specific resistor values between that pin and ground.
But I'm wondering how... |
H: PIC MCUs C language Compilers and IDE for PIC16F and PIC18F
I want to write some program in C language for a PIC16F and a PIC18F. I searched in the internet and I got confused with the name of them! I want a free version and I know that my C program is less than 2 KB. Does MPLAB lonely enough? Or I need to install ... |
H: MHz oscillator probe impedance?
I find something weird going on in my 100MHz oscillator probe.
I always thought the probe has a resistance of 1M ohm, but apparently at 13MHz, when I put a 2.2k ohm resistor in series with the probe, the reading is severely reduced. Does this mean that the oscillator probe is actuall... |
H: Is current with a frequency less than 1 Hz still considered DC?
We had a big argument last night with vague conclusions. Is the current with a frequency less than 1 Hz considered DC?
It would still resemble a wave...
AI: AC and DC are relative terms. If you're looking at a 10kHz waveform for 100ns, you will think i... |
H: How to prevent MPLABX and XC16 from polluting my assembly program on 16-bit PIC24?
I recently started programming PIC microcontrollers after AVR and I wrote a small, do-nothing program just to see what the assembler produces in the HEX file:
;File: main.s
.include "p24FJ64GA202.inc"
.global __reset
.global... |
H: find RPM from Pulse of motor
I have an electronic gearbox motor with the following details:
25GA-370-12V -330RPM
I want to find a PID control for this motor in Matlab. I take data from this motor by Arduino Due driver and an Arduino program.
The duration of printing of test is 0.003 sec (per 0.003 sec how many pul... |
H: Estimate current through inductor in DC circuit with PWM control
I am designing a circuit to control an electromagnet (coil with iron core) through a N-channel MOSFET driven by a PWM signal.
I can't figure out how to derive the relationship between the PWM duty cycle and the current I will get in the coil, and I ne... |
H: What is the proper way to preserve solder iron tips?
My question is should you turn off a solder iron to preserve tip when not in use. I am currently working on a project which requires sometimes a lot of soldering and sometimes occasional soldering to reroute wires or just tin wires to use as jumper cables. I work... |
H: Arduino detects voltage on ground
I've been having a hard time finding a solution to this problem.
I recently ordered a 5 Volt 2Amp AC to DC switching power supply from adafruit.cc
When I connect my Arduino's analog sensor to the ground of my switch mode power supply my Arduino detects that it's oscillating.
I th... |
H: Bell Detector with Arduino
I am trying to upgrade our existing bell with my arduino to detect whether the bell is used and to mute the bell.
The circuit for the bell runs with 9V AC. In order to minimize the wiring I want to serially connect something to the bell such that it is possible with my arduino to turn th... |
H: Interfacing a USB webcam to an Arduino board
I'm trying to connect a USB webcam to an Arduino board (Intel Galileo), the Galileo is powered by a 400 Mhz processor, has 512 Mb of RAM and 8 Gb of external storage (SD Card). I'm a computer science major and electronics is not really my field, what I understood to this... |
H: LCD Display connection
How to connect this http://docdroid.net/ngqg LCD Display to microcontroller? It is ILI9341 based.
Is it possible to connect only SPI/LED pins and leave every other input pin floating or I need to connect every pin(HSYNC, VSYNC etc.) and control them myself.
Thank you!
AI: That display requir... |
H: Micro audio preamp with low consumption [SOLVED]
The audio output for all of my devices/computers is too small to push my speakers to the maximum.
I want to build a very small audio preamplifier to hook between the computer and speaker to boost the signal a bit. The output should be about 0.5V
Can you suggest some ... |
H: mechanical relay output voltage doesn't change
As a followup to my previous question, where a 2222 npn transistor wasn't beefy enough to handle the load I was putting on it to activate a solenoid valve, I decided to try a mechanical relay board kit instead (which I realize is overkill for what I need, but it wasn't... |
H: Using a transformer with 400 volt rated primary side with a 120 volt line
Is it possible to use a transformer rated for 360 to 400 volts on its primary side on a 120 volt line? Will it still perform adequately? And I would assume the turns ratios still apply?
This is the transformer in question: WE-LLCR Resonant Co... |
H: Where is a good place to start learning about electrical engineering for AVR stuff?
Can someone point me to a really good tutorial on electrical engineering, mainly avr stuff.
I have looked at alot and none in my opinion really give a complete idiot like my self a good place to start.
AI: Electrical engineering is ... |
H: Design up counter in VHDL using generate statement
I need to design an 8 bit up counter in VHDL using T flip flop and generate statement. I know how the counter works, but I am not able to design it in VHDL.
The main problem is "using generate statement" . As I can see, in an up counter (ripple or synchronous ; eit... |
H: Deciphering datasheet descriptions: "normalized series 54/74 load"
I was reading something when I came across a project using the SN74180 parity checker IC. I begin looking at the datasheet when I came across this description:
The SN54180/SN74180 are fully compatible with other TTL or DTL circuits. Input buffers a... |
H: How Does Connecting a Battery in Series Affect Current Flow
Background:
I am creating a circuit to run electronics and motors. The some of the electronics are 5V some are 12V and the motors are 24V. I have a small universal 12V battery for the electronics I run it through a 5V regulator for the 5V electronics. I... |
H: Changing voltage multiple times
I am trying to power an atmega328p, and the esp8266 for one of my projects.
I am trying to drive a relay to switch lights on and off. The problem is that the relay runs on 12v, the atmega runs on 5v and the esp8266 runs on 3.3. I was thinking of using a board mount power supply to us... |
H: Simple switching between clocks using oscillator disable pins
I am working on a circuit where I need to use different clock sources. I am using two HCMOS oscillators. Both oscillators have an disable pin. When disabled, the clock output buffer is placed in tri-state.
Can I safely connect both lock outputs with each... |
H: How to build an FM transmitter and how does it work?
I have become interested in radio transmission and would like to know how to build an FM radio transmitter. When I search for information I either get a block diagram or a video of someone putting it together with no explanation. I have basic electronics knowledg... |
H: Diode voltage rate of change and junction capacitance
I was looking through some schottky diodes and saw in their datasheets, that they have characteristic called voltage change of rate [dv/dt]. Most of those I saw have it exactlly 10000. Now, in datasheets, they also specify their junction capacitances, which diff... |
H: Serial connection via 3.5 mm Jack
lately I have been experimenting with the Intel Galileo, the thing is that I can't get the serial connection to work so I can do the "Linux magic". Today I bought this cable and tried to establish a UART connection but this error pops out. Any clews?
AI: That cable does not provide... |
H: How to test and rate a home-built low dropout regulator?
I built a low dropout regulator following experiences building a discrete linear regulator. The circuit is simple like this:
simulate this circuit – Schematic created using CircuitLab
I would like to know how to test the maximum voltage inout and output, cur... |
H: Pinout of the IRL7833 N-channel MOSFET?
I downloaded the datasheet for this MOSFET, but can't find where it labels the pinout anywhere. Has anyone used these before? I got them for cheap from Amazon, and I'm hoping to control some DC lights with them from an Arduino.
Here's the datasheet: IRL7833
From what I know, ... |
H: What is considered low or high frequency?
I've been reading some guides and papers on data acquisition and often times on the subject of measuring frequency they will simply say
For low-frequency signals, it is sufficient to use one counter, or
timebase. The rising edge of the input signal triggers the number of... |
H: Microcontroller-based SMPS designing
Is it feasible to construct a variable voltage SMPS using one of each of the following:
ATtiny84 microcontroller
IRF4905 power PMOS
2N7000 signal NMOS
4.7mF cap
220uF cap
AD5280BRUZ100 100kOhm digital potentiometer
680mH inductor
1N5819 Schottky diode
AMS1117-3.3 LDO regulator
... |
H: Why the need for multiple I²C ports?
The I²C protocol allows, in theory and with 7-bit addressing, up to 127 devices to be connected to the master. This is a large number, so why would any low-cost microcontroller (e.g. this PIC24), have more than one I²C port? Why is it needed?
AI: Sensor hub arrangement
In this s... |
H: Parallel transformer outputs
If I fed in ~140 volts at 100kHz to This transformer what is the most power I could get out of it? The data sheet rates it at 36 volts DC 3 amps on one of its three outputs but I am confused by this.
First, the saturation current is rated at 7.4 amps so why is the output current signif... |
H: Capacitive touch directly above LEDs
I'm trying to make a design where the user can run his/her finger directly over a series of 10 LEDs (covered with 1 mm glass), and the LEDs should glow on/off based on the finger's position.
I wish to use capacitive touch (like on a phone, where the touchscreen is directly above... |
H: Arduino PC LED strip controller
I have an LED strip being controlled by an Arduino and powered by a molex connector within my PC. I'd like to have my Arduino connected to my computer via USB 24/7, however when I do this, the molex grounds itself through the USB connection when I toggle the switch to the off positio... |
H: Eagle: What is the significance of the tCream layer having this "hashed" pattern?
I am trying to modify a part because in the original libary, some of the pads were of differing sizes. I would like to make all pads to be of the same size. In the following image, there are three pads. The first and third pads are in... |
H: MPU-9150 (IMU) - what happens at fullscale range boundaries?
We're debating the use of the MPU-9150 IMU in an application. This IMU has a user settable full scale range for the accelerometer (e.g. 2g, 4g, etc) and gyroscope (200dps, 400dps, etc).
Suppose I set the values at 2g and 200dps - what happens at the bound... |
H: "Ultimate" Surge Protector with Solar Cells
I've had an idea that I was wondering if it would be possible.
I came up with this idea when thinking about local computer backups. Companies such as IoSafe make hard drives which are water & fireproof, however I'd be willing to bet that a good electrical surge would take... |
H: Using a Arduino Pro Mini to power more than 2 servos
I don't know very much about Arduino, but from some basic research I have read that the Arduino Pro Mini can only support two servo motors.
I am trying to create a set of reaction wheels using hard drives, brushless motor controllers and an Arduino Pro Mini. (I c... |
H: How is the current limited in this common drain circuit?
I'm trying to create a dummy load circuit, but it was limiting itself around 1.7 A, so I built this circuit. V1 is 0 - 5 V via a potentiometer, and V2 is a 5 V / 3 A power supply.
simulate this circuit – Schematic created using CircuitLab
When I increase the... |
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