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H: Max Serial Cable Length?
What is the maximum length of serial cable I can use, to connection work properly? Is length of serial cable in connection with baud rate? I am using about 5 meter cable at speed 38400 bauds and RS232 communication, is it too long?
AI: Capacitance in the cable begins to affect serial commun... |
H: BeagleBone Black User Leds
Is it possible to set some of four available user leds to show serial port activity, like we can set it to show mmc activity?
AI: Based on Ubuntu linux on BBB, but other Linux will work similarly.
The user LED mode can be accessed using the following command:
echo none | sudo tee /sys/cla... |
H: Can I use electrolytic capacitor in a schmidt trigger oscillator
I want to build this cricket chirping circuit that I found on Happy Lab.
The values are specified as follows
R1: 100 k
R2: 39 k
R3: 290 k
C1: 100 nf
C2: 10 µf
C3: 10 µf
C4: 100 µF
D1,D2: 1N4148
IC: 74HC14 (6x inverter with Schmitt trigger)
I have... |
H: In MIPS Instruction set, why do we sign extend the immediate data instead of zero extend in I type instructions?
Recently I was reading the "Computer Organization and Design" Book By Patterson and Hennessy, and I came across the question that in order to make the immediate data 32 bit in Immediate type instructions... |
H: Can a radio transmitter somehow detect the number of receivers in its area?
During conversation, a colleague proposed that over-the-air television and radio broadcasters can determine the number of viewers or listeners based on the "load" on their signal. This seems to me like total bupkis, but he's piqued my curio... |
H: Adding a resistive path between live conductors and earth - safety issues
(Note: I am in the UK so the terms 'line' and 'neutral' refer to the two live mains conductors)
I am trying to establish a list of safety issues which I should be aware of if I decide to introduce a resistive path between either of the live m... |
H: Find the 'Effective Voltage' with only the surface under and above the 't' axis
To find the 'Effective Voltage' and the 'Average Voltage' of a voltage over time we have the following functions:
$$V_{eff}=\sqrt{\frac{1}{T}\int_{0}^{T} f(t)^2 \text{d}t}$$
$$V_{av}=\frac{1}{T}\int_{0}^{T} f(t) \text{d}t$$
But in my ca... |
H: Connecting unused logic gates
Logic gates like AND, OR, NOT etc. often come packed as arrays in ICs.
Sometimes not all gates are used in a project. I would like to know how the remaining unused gates should be connected to achieve minimal influence on the system (energy consumption, interference) based on which te... |
H: What are the differences between optoisolator output styles?
Digikey lists optoisolators with several output types:
Darlington
Darlington with base
Photo FET
Photovoltaic
Photovoltaic, linearized
Transistor
Transistor, with base
What are the differences among these, and in what circumstances would I use one or an... |
H: AC power cord different on a laptop and a desktop, other appliances
If I look at the power cord plugged from the wall socket to desktop computers, monitors, etc. at the office, it looks like (North America):
Now, if I look at the power cord plugged into my laptop's power supply (North America again):
I checked wi... |
H: Connection of the circuit breaker
Where is the circuit breaker connected in an electrical installation? Is it on the live line or on the neutral line of the generator? Why?
AI: Circuit breakers are always found at the location where the size of the wire changes. For example, when wiring enters your house and splits... |
H: Do I need a decoupling cap for a line buffer gate?
The data sheet does not say anything about the decoupling capacitors for this buffer gate. Would it be correct to assume that no caps needed? Please, explain.
AI: In theory the chip does not need a decoupling capacitor, what it needs is a power that is within its s... |
H: Is programmable gain amplifier(PGA) in ADC enought to get me precision
I have 4 x 3wire load cells from a old weight scale connected as a full-bridge and I want to connect them in my uC ( Atmega328P, but not arduino ).
I want to measure weight under these specs:
Precision is the first most important spec
Error due... |
H: How do I enable the internal 32MHz clock on an XMEGA avr in assembly?
This is the C code that I currently use to enable the 32MHz clock:
CCP = CCP_IOREG_gc;
OSC.CTRL = OSC_RC32MEN_bm;
while(!(OSC.STATUS & OSC_RC32MRDY_bm));
CCP = CCP_IOREG_gc;
CLK.CTRL = CLK_SCLKSEL_RC32M_gc;
But this code needs to be compiled wit... |
H: phase-stability two op-amps
I'm trying to simulate two op-amps back-to-back (G=30 each) in LTSpice and work out if they will be stable. If I look at the .ac analysis after the fist op-amp I have good phase margin (about 60 degrees). If I look at the phase-margin after the second op-amp my phase is now -200 degree... |
H: Do op amps need one bypass capacitor or two?
As with other ICs, it's standard practice to place bypass capacitors near the supply voltage pins of op amps. But I've seen conflicting opinions on how to properly bypass an op amp (here, for example). Some people suggest putting a single capacitor between the V+ and V- ... |
H: Why would you use a non-contact voltage detector if you have a multimeter?
I was reading this Fluke multimeter safety manual and I came across this sentence: http://faculty.riohondo.edu/jfrala/fluke_multimeters_-_abcs_of_multimeter_safety_multimeter_safety_and_you_application_note.pdf
"Non-contact voltage detectors... |
H: What hole size for test probe to get a snug fit?
I’m designing a bed of nails test jig. I want my test probes to fit snugly in the circuit board, but want to allow for variation in the through hole plating of the hole.
In Altium, when you specify a hole size, is that the drill hole diameter the hole size after or ... |
H: BeagleBone Serial Communication
I have a problem seeing characters written in /dev/ttyS8 on my PC terminal with this C code:
void main (void)
{
int file, i;
unsigned char receive[100]; // declare a buffer for receiving data
char buf[20];
size_t nbytes;
ssize_t bytes_written;
if ((file = ope... |
H: Is it OK to leave some part out of the schematic if noted?
When I make schematic drawings for my projects I tend to leave things like the power switch, fuse etc. out of the schematic. I do it because I don't feel it's an important part of the circuit, one might argue that it's not actually a part of the circuit at ... |
H: Out-of-band communication between two PCs
I'm working on a little project. In the project, data must be sent from a PC to another device. Initially, I used a Raspberry Pi and life was good. I could communicate Python between the RPi and the PC via a USB to serial interface as the RPi has serial I/O pins. Eventual... |
H: Comparison between uint8_t and String
I have a very fundamental question regarding string comparison..
I implemented a USART to PC with STM32L0 Nucleo board, and I can type something in terminal and receive it on the micro as follows:
#define RXBUFFERSIZE 1
uint8_t aRxBuffer[RXBUFFERSIZE];
/** Put UART peripheral ... |
H: Voltage regulator question
I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose original charger outputs 5 volts and 2A) and the device starts charging, after a few minutes,... |
H: Jumper or resistor?
I have in my BOM (Bill of materials) the following component CR21- 000-T and in the datasheet of the component : CR, CJ series is specified CR21 series as 0805 resistor.
But the 000 is specified as a chip jumper
Blank = jumper chips.
Is this a resistor or a jumper?
AI: I would expect it is a 0... |
H: Chassis Grounding a Bipolar Floating Power Supply
I'm building a simple function generator powered from a 24V AC wall adapter. I've rectified the incoming AC to 24V DC using a full wave bridge and an LM317. I intend to split the supply into +/-12V rails with a virtual circuit ground (see image below).
My BNC con... |
H: How can an ADC measure below its resolution?
An ADC's resolution is set by the maximum input voltage divided by 2b where b is the number of bits. In that way, a 16-bit ADC with 20V input can measure a voltage of 20/65536 = 0.3mV (corresponding to the ADC level 0000000000000001). However, I know an ADC can be used t... |
H: Do all USB Type C cables support full power delivery?
USB Power Delivery is able to work over USB Type A/B cables which are specifically designed to support it.
Since the USB Type C was designed much later, I am curious: Do all USB Type C cables support USB PD by default? And do they support a certain level, or the... |
H: What is the name for an IC that accepts an analog voltage and outputs a proportional PWM signal?
I want to isolate an analog signal. One way of doing this is to convert the analog signal to PWM, isolate the pulses with an optoisolator, and filter the PWM on the other side. Obviously I could do this with a microcont... |
H: Protect Beaglebone Black from Power Outage
I am using a BBB (Rev C) as a web server, powered by a 5V power supply connected to the 5V jack. I read in several locations that disconnecting the power supply to turn off the board can damage the board.
Is this an issue if the BBB is running and there is a power outage?... |
H: Proper Method of Powering Nokia 5110 LCD
I am considering getting some Nokia 5110 displays for use with my Arduino Nano board but I am in a pickle because I can't tell the correct way to wire it.
Some people say to power it with 3.3V and only 3.3V and to use 3.3V logic or else. But other people claim running it on... |
H: Are steady-state values in LTI systems differentially influenced by the rate an input is introduced?
I have a general question about LTI systems I was hoping someone could clarify.
I'm currently learning about steady state behavior in LTI systems, and how you can evaluate them with different inputs. So here's my qu... |
H: Using Single-Phase and 3-Phase Equipment?
Let's say I have a single-phase facility and I plug in a piece of 3-phase equipment, what happens?
Is it dangerous?
Is it less efficient (if so, approximately how many percent less in efficiency)?
What kind of adjustments, if any, would I have to make to make this setup wo... |
H: VHDL how to make a redundant case statement simpler?
I'm using case statements to check the bits of a word. Is there any way to write this more compact since it uses a lot of space (I have other signals on which I want to do this aswell).
...
case a(1 downto 0) is
when "00" =>
r(3 downto 0) <= ... |
H: Circuit Analysis of Op-Amp Offset Voltage Tester
I am reading Understanding Op-Amp Parameters section 11-9. I would like to get my work checked.
My assumptions:
The servo-loop, presumably the op-amp configuration right before V_out, maintains the V_out of DUT at 0V with the virtual earth of -ve input.
The feedback... |
H: How to control RC Servo motor using 8051?
I'm using an 8051 MCU and I wish to control an RC servo motor with 2 push buttons for an RC toy car.
I have code to use two buttons, one for right and another for left.
When I click one button, the servo motor moves in one direction but then remains at this position.
What I... |
H: Simplest way to produce a lagging pulse (latch trigger) after receiving another pulse (clock trigger)?
I am teaching myself how to use a 74HC595 shift register, and am fairly new to proper digital circuit design. I ran into a question. I am using a simple circuit involving a few LEDs, a switch for data, and a cou... |
H: How is the resistor value for boost conversion calculated?
I'm looking at MCP1640 and in Section 5.2, an equation for calculating RTOP is presented. However, the two examples underneath have RBOT = 309kOhm. How did that come about? Is 309kOhm some standard value? Without fixing a value for RBOT, one could only deri... |
H: Portable phone/device charger
I am doing my best to make a portable charger.
Here is the link with the schematic of the circuit I am working on:Voltage regulator question
.I was told that the 9 V battery I was using didn't have enough capacity to charge any device,so I decided to connect 5 1,2 rechargeable batterie... |
H: How to ensure the two schematic diagrams are equivalent?
I've tried copying the schematic diagram of a typical circuit from the datasheet, but I'd like to ensure the correctness of each connection. Is there a way to somehow match one schematic diagram against another?
If simulation is the only thing closest to such... |
H: Uninterrupted current triggering transistor base
I'm still pretty much a electronics-beginner, I'm currently working on modifying a USB game-pad to use switches instead of buttons and I want LEDs to accompany the switches. The basic solution I was hoping to use looked like the following:
simulate this circuit – Sc... |
H: set one output high at a time when multiple inputs are high
I'm making a small circuit for detect water level of our home water tank .here is the diagram.
when water level is low i want to turn red led when water level is max i want to turn green one on and so on.but current circuit turn both red/yellow/green when... |
H: Is there a way to Divide two 8 bit number in PIC 18fXXX assembly language not C?
I Can easily do the division in C of PIC micro controller.
But is there a way to divide two number stored in two 8 bit registers.
For example look at this code.
I have to do it in PIC assembly for 8 bit Microcontrollers.
ORG 0H
R1 EQU ... |
H: What is the significance of Common Mode Signals?
I don't understand the physical significance of Common Mode Voltage.
It is arbitrarily defined as the average of two voltages and is expected to be rejected by a differential amplifier. Why? What is its physical significance?
EDIT
my question was specific to differen... |
H: LM317 current source
I want to use an LM317 to make a current source circuit for driving high power LEDs (500-700mA.) The schematic in its datasheet has no capacitor, but in some schematics there are one or two capacitors like the one below:
Are they necessary? If I omit them, can the possible ripples damage the h... |
H: Relationship between band gap and built in potential for PN Junction Diode in equilibrium?
I wanted to know the relationship between the band gap (Eg) of the p/n regions in a diode and the built in potential in equilibrium.
My intuition says that Eg = e*Vo. I did a small calculation for silicon at T=300K. I got the... |
H: Using bit fields in interrupt-driven applications
When implementing interrupt-driven applications I usually create a bitfield to keep track of different interrupts. For example:
volatile struct {
unsigned char ISR0: 1;
unsigned char ISR1: 1;
...
unsigned char ISR7: 1;
} ISRstatus;
The rest of the a... |
H: Combining resistors in series with a voltage source in between
Am I allowed to combine the resistor R and coil Xl as if they were right next to each other? I want to make this into a current generator, without many transformations.
AI: You can only combine two single elements into one for sake of analysis if they ... |
H: DPDT switch using only transistors
I have seen a number of similar questions but no one ever seems to actually answer this question, so let me pose it a different way. Let's suppose I am stuck on a space ship (so I can't go buy some other parts) and I must replace a blown DPDT relay. I have a handful of NPN and PN... |
H: Difference between High- and Low- side switching of power?
Is there any real difference between high- and low-side switching?
Assume:
Switching is for on/off control of an object (My case RPi)
Base/Gate can be driven to Vcc and GND
AI: The only real differences are the ground level and maximum current available:
... |
H: Extending 500us pulse for multiple input signals and minimum IC count
I need to extend as fast as 500us input pulses to ~150ms for them to be detected by a downstream circuit. Pulses are coming from sensors.
I've found other answers in this site and others about using retriggerable monostable multivibrators, but th... |
H: MOSFET driving MOSFET for reduced reduced Rds
I am using a PIC to drive the gate of a logic level MOSFET. Although the 5V logic output of the pic is sufficient to exceed the threshold voltage I would like to drive the gate using 12V to reduce the Drain-Source resistance.
In order to achieve this I have drawn up th... |
H: Mixing 2v and 3V LED's and calculating resistors
Are series groups in parallel better than strictly parallel with a resister on each leg? And for parallel do I calculate Ω just for each voltage LED or do I need to somehow do a calculation that takes into account the total number of LED's and their different voltage... |
H: Audio Grade Capacitors - Marketing Hype or Better Technology
I have been reading a lot about audio grade capacitors lately, and I cannot find very good information about them. I have read many posts from different sites saying that audio grade capacitors are just a marketing hype, and that there is nothing new insi... |
H: Is it possible to use a USB Wifi dongle with STM32F429I Discovery board?
I have been using wifi modules like ESP8266 and EMW3162, but this increases the load of work. I would like to use a usb wifi dongle (because discovery board has extra usb interface).
Is it possible? Do I need some kind of specific driver or a... |
H: battery overdischage oscillation protection
I previously asked asked an advice on power control of battery operated system.
The problem was to cutoff the battery when low to avoid overdisharge.
I have built the device according to Olin Lathrop's advice to add hysteresis to avoid oscillations. Unfortunately this doe... |
H: Separating power ground from control ground
I'm looking at the 'layout considerations' for TPS61030. On p.18, it says
Use a common ground node for power ground and a different one for
control ground to minimise the effects of ground noise
Aren't the power ground and control ground connected to the negative of ... |
H: Mosfet identification
What mosfet is this? I know that it's N-Channel but where's the side of Source and Drain? I think, Source it's at right side, because of shifted Gate line... What's the usage of the two opposite diodes?
AI: The two diodes exist in any MOSFET (and as @MrBit points out, they actually should be t... |
H: Forming Norton generator from a voltage source and two resistors
Can I combine the E,R and Xl to form a current generator, with R and Xl in parallel. I need to find the impedance of Z so it develops most power, R-jX, or Z*, if Z is the impedance of the rest of the circuit.
EDIT: That is whether it can be transform... |
H: STM32: Timer Modes
Is is possible to measure the frequency of an input analog signal with the input capture mode of Timers in STM32F4 ? If not, then what is the alternative ? Thank you in advance.
AI: Introduction
It seems like you are trying to build a frequency counter. You can achieve such a device with the time... |
H: If adding resistors in parallel decreases total resistance, why doesn't the voltage in the circuit change?
I'm sure I'm missing something basic, but here we go:
If adding resistors in parallel decreases total resistance, why doesn't the voltage in the circuit change?
Does the current increase to match the decreased... |
H: Tranmission line equations when initial conditions are not zero
A high voltage DC line is in steady state sufficiently long time after applying 1 MV at the input terminals through a DC voltage source of 30 ohm impedance with an open circuit at the load end. The characterstic impedance of the line is 20 ohms. The li... |
H: Running 2 5V USB battery power packs, Can I use them in parallel
Can I run two 5v power packs in parallel to give me more mAh's (Time)? Or will one try and charge the other?
Example
I.E. connect both 5V lines together, both GND lines together to my device
AI: I would highly recommend against paralleling two of the ... |
H: Search for matching string on the other string
I have a problem with strstr function, I receive characters from UART with interrupt & save them in the n length array(buffer array). Then in main loop I check the buffer with strstr function from string.h for finding a special sequence of characters(for example" hello... |
H: Dependence of Inductance of a Coil on the gap between turns?
I was wondering how does inductance of a coil say wrapped around a core change by increasing the gap between turns ?
Usually it shouldn't depend on it from the Formula of L being equal to (uN^2A)/L
but is it affected ?
Also Part 2: Say if it was an iron... |
H: Flip Switch with transistor and push button
Sorry if this is a duplicate, I don't know the actual term for what this is called.
I am trying to create a circuit where the push button will switch the current from Red LED to Blue LED on right. Currently the blue LED lights up but Red one doesn't go off. I know I am mi... |
H: Stereo-Mono circuit after passive bandpass filter
If i put a passive RC band pass (high pass + low pass) filter before the amplifer and right next to it I sum the channels with 1-5 k ohm resistors, then the amplifier is turned on,is there a possibility that those summing resistors could act as a filter prolongation... |
H: Importance of phase angles when analysing AC circuit
Freshmen EE circuit. Resistance, inductivity, capacitance are given and effective value of voltage. No phase angles are given.
When calculating complex power, may I assume the phase angle of the voltage source? Current should adjust accordingly and give me the s... |
H: Why is it usually the case that the negative rail for ICs needs more decoupling capacitance (has worse PSRR) than the positive rail?
That the premise in the question seems to hold can be seen from various sources, including:
comparing the datasheets of various clones of LM317 and LM337 (too many to list, but gener... |
H: Allowed error in baud rate between pic and Bluetooth module
I'm trying to connect a dsPIC33FJ128MC804 - 16 bit pic - with a Bluetooth module
the problem is i have few baud rates of Bluetooth to choose between them , searched the net but could not find the allowed baud rate error due to baud rate generator register... |
H: Skew angle in squirrel cage induction motor
The rotor in the squirrel cage induction motor are shorted end to end by aluminium bars; however the are placed parallel at a certain skew angle.
Wikipedia states that "The conductors are often skewed slightly along the length of the rotor to reduce noise and smooth out t... |
H: Implementing Safety Shut-Off Relay In Project
I am working on a project which I have poured lots of cash into that involves water, pressure and electronics in very close proximity of each other... Lately, I have been considering adding some fail-safe mechanism which will cut all power to the machine if any water is... |
H: Create a CMOS circuit from a logic function F=~A+B
I tried to draw the a CMOS logic circuit, but I don't know whether is is right or not.
The function is: \$ F = \overline{A} + B \$
$$ F = \overline{A} + B $$
$$ \overline{F} = \overline{\overline{A} + B} \Rightarrow A \times \overline{B} $$
simulate this circ... |
H: Vcc and multiple USB Devices on one board
I'm working on a prototype board which has multiple USB device connectors (e.g. the one for a microcontroller thing I'm communicating with, and a second one for JTAG).
Now I wonder how I should treat the VCC line, because I'd like to power the board from either USB connecto... |
H: Difference between Micro-Operations in RISC and CISC processors
I've read that the modern Intel processors use the CISC instructions on the top, which are converted into RISC-like simpler instructions in the form of Micro-Operations at the back-end.
So if Intel micro-ops are RISC-like simple hardware level control... |
H: Doped PNP Bipolar Transistor
When doping a PNP bipolar transistor, does it matter which parts are doped by what amount? The picture below will show my question. Am I right in saying that the Emitter is connected to one P region, the Base is connected to the N region and the collector is connected to another P regio... |
H: Specific Questions Regarding Use of Regulated Switching Supplies
For a project I am working on, I have 3 regulated switching supplies, 5v 5a, 12v 5a, 24v 2a. They are the standard, passively-cooled type which look like this
My question:
Can I stack these/have them making contact with each other? I have a very small... |
H: How to represent a 3 bit counter in Data flow style?
I want to represent a 3 bit counter in Data Flow style in VHDL. But I am getting confused.
Any hints how it is going to be represented.
AI: If you were to examine the link provided in Dave Tweed's comment -
It depends on exactly what you mean by "Data Flow style... |
H: per-charge cost to charge a battery bank at $0.10/kwhr
Am I forgetting my EE knowledge?
I have a 10400mAh battery bank at 3.8v so it's ~40kwhr?
$4 to charge once? assuming perfect charger efficiency and no power loss to heat
AI: No, just your SI prefixes. 10.4 Ah * 3.8 v = 40 Wh = 0.04 kWh = $0.004. |
H: How to make 1 bit permanent memory circuit?
I would like to make a simple circuit to store or save 1 bit of data. The circuit should be able to remember the state of an LED ( on or off ) even if the supply is disconnected from the circuit. I need it to work like a hard drive, flash memory or SD memory card of cell ... |
H: What is the maximum power an inductor can transfer in a SMPS?
I'm trying to analyze a boost converter circuit. I have all the specs for the inductor used, including inductance (6.8uH) and saturation current (1A). This runs from a 3V supply. I'm wondering if there is a formula for the maximum power than an induct... |
H: How do I use the on board oscillator?
I have the MAX II EPM240 CPLD Minimal Development Board which has an on-board 50 MHz oscillator. According to the "EPM240MAINBOARD Schematic Diagram" file, the output of the oscillator goes to PIN 63, but there is no PIN 63 on the board. How do I use it? What modifications shou... |
H: How do I avoid interference in 433 MHZ RF transmission (in my case)
I suppose to do remote keyless entry (RKE) for door opening as a commercial product, there is DC motor which drive the door to open or close (receiver side), on transmitter side (remote) three button for 'OPEN' ,'CLOSE' and 'STOP'.
I'm new to RF, b... |
H: Is it safe to use PC analog output card as current source?
I have a very PCI analog output card which could output a voltage ranged from 0 to 5V. I need a circuit to output a current ranged from 10mA to 90mA. The load is about 45 Ohm.
So is it safe to connect directly the analog output to the load and change the v... |
H: How do I learn to design a 50Ω coaxial interconnection/interface?
I've designed an electronic load for testing power supplies (circuit and photo in this post: Designing a *linear* MOSFET driver stage).
The load can be controlled (programmed) using an arbitrary waveform from a function generator; a typical example w... |
H: How to measure resistance of resistor in PCB?
I have a resistor 1MOhm soldered in a PCB that looks like that
And the schematic is looking like that:
When I measure the resistance by touching the a multimeter on the two ends of the resistor the measured value is around 500KOhm. When the resistor is not soldered th... |
H: Powering a LED off a 1,2 volt rechargeable battery
I would like to power a LED off a 1,2 volt rechargeable battery,850mAh,energizer without any resistors.Since the LED has a forward voltage around 2 volts,working fine when connected to a 1,5 volt alakaline AA battery,it's obvious that the voltage isn't a problem.Ho... |
H: Common Serial Port Issues
What are some of reasons that PC terminal receives garbage characters from one microcontroller?
I am using BeagleBone and UART works okay, but after few transmitted command characters from PC terminal to microcontroller, PC terminal starts to receive weird characters while I am trying to ... |
H: In the given circuit of a regulated power supply, why is error computed twice, i.e., before and after isolation?
Circuit Operation
\$R_4\$ and \$R_5\$ constitute the potential divider which is fed to the error amplifier \$A_1\$. The reference voltage is generated by the Zener diode \$Z_1\$. The error signal is fed... |
H: AVR SPI shift register not clocking
I'm trying to generate parallel output by writing serial data into a shift register (SN74HC595) via SPI on an ATMega328 (SPI master) running at 20MHz and SPI running at 10MHz. The bare minimum schematic to reproduce my issue is below (VCC = 5V).
The code generates the correct wa... |
H: Reading a 32bit IC counter on from a computer
I am working on a design to count the mechanical cycles of a piece of equipment. It has to be a 32 bit counter and be robust. I have a working prototype using a sn74lv8154 IC, configured as 32bit.
There are 2 main issues with the design
1. Reading the count
2. Losing t... |
H: How can a high-voltage transistor be in such small packaging?
For example:
STN0214 - Very high voltage NPN power transistor
It is said to accept more than 1 kV between its collector and emitter. It comes in a SOT-223 package (3 pins plus a tab). With a dielectric strength of 1 kV/mm for humid air, cannot an arc a... |
H: Saleae analyzer problem
I have a SPI protocol and i can't analyze it. The at the beginning there is starting transition from 0 to 1 of the clock signal. The analyzer is treating this transition as information and analyzes from that point. But it is just a hardware clock transition on the power on. It carries no in... |
H: Energy in active noise cancellation
In an active noise cancellation system, to what form of energy is noise converted and how is the energy produced?
AI: Active noise cancellation works by generating a sound with 180 degree phase shift from the original sound. It's effectively an interference effect.
Like any inter... |
H: Noobie is trying to match a solar power bank and a wireless camera
my dear friends all around the world!
I'm very interesting about this cool solar power thing, and I really want to start connecting all of my stuff to panels and so.
But for my first and ,hopefully, successful try, I will simply use a simple (appare... |
H: Raspberry Pi 2 vs STM32f429I Discovery?
I couldn't really figure out this issue. Raspberry Pi 2 has 1GB of RAM, 900 Mhz Quad Core ARM Cortex-A7 processor and so on. On the other side we have Cortex-4 processor 256Kb RAM. Other peripherals also points to Raspberry pi. However they have almost the same price.
Please ... |
H: What's the difference between PWM and VPW?
What's the difference between pulse-width modulation (PWM) and variable pulse width (VPW)?
AI: The word 'width' in Pulse Width Modulation is a bit misleading. PWM actually encodes an analog value as the ratio of High or On time ('pulse width') to the total period of a rect... |
H: Does PWM affect current?
How does PWM affect current? Since current is dependent on voltage (higher voltage allows for more current) decreasing analogue voltage reduces current, but what about PWM? If the actual voltage is only full/none, is the current also full/none or what?
AI: The current at any instant will be... |
H: Circuit to remove dc and extract AC signal
I just started working in the Power Electronics domain and I am learning and understanding the concepts of electrical and electronic circuits.
Attached is the circuit diagram I am trying to understand and design.
At the Point_of_Interest, I want a circuit that extracts the... |
H: Why don't LiPo charger chips isolate the output during shutdown?
From what I've gathered, boost regulators from MCP1640 to TPS61090 disconnect the load during shutdown so that the battery is not drained during shutdown.
However, charger chips like BQ24295 don't seem to isolate the output during shutdown (at least I... |
H: Is there a software program that calculates the Transfer Function for a given circuit?
I'm asking for a program (either freeware or not) where you can draw your circuit as the input, as it happens in PSPice, Multisim, LTSpice etc.., then specify two nodes of reference, say \$ V_{out} \$ and \$V_{in}\$, or \$V_1\$ a... |
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