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H: Building a pseudo-solenoid electromagnet - Heat disipation
I am planning to build an electromagnet as shown in the picture below. The copper windings are coiled around a thin plastic cylinder. The goal of the setup is to attract small metal chips floating in water inside the cylindrical space to the inner wall of t... |
H: LM2596 voltage regulator not providing steady voltage
I was trying to simulate a 3 phase AC full wave rectifier, and wanted a 5V output.
I connected an LM2596 module to turn the rectified voltage into the desired 5V output and ran the simulation in LTSpice.
To my disappointment, I found that the voltage was not onl... |
H: Turn on voltage when input is grounded
I have a new intercom that requires 12V when the ring switch is pressed, but my ring wire does not supply voltage, it just loses its resistance (it is grounded.)
What circuit do I need to turn on voltage when the input is grounded? P MOSFET? I am not an electronics engineer, s... |
H: How to prove a system is stable if the characteristic equation have non zero positive coefficients?
I read that a control system would be stable if its characteristic equation has got all the terms present and are positive. But I could not find any proof to it. How does one prove it?
AI: This is very likely a refer... |
H: PWM generation with master/slave timer configuration
I am going to generate a PWM with master/slave timer configuration. I prefer that my master timer generates PWM with an interrupt. I need to connect this interrupt to another timer as its input clock to count the number of the pulses.
Based on this diagram, what ... |
H: How hot is too hot for a transformer?
I recently ordered a custom transformer and under load with half of its rated current it heats up to 55 °C, and now it's started to radiate a "weez" noise.
Is this normal? How hot is too hot for a transformer?
How can I get rid of the noise? Pushing it down doesn't help!
Update... |
H: SPI communication over different voltage
I was working on a PCB design and I am stuck on a question over SPI communication over different voltages.
I am using some 74HC595 and 74HC165 shift registers to expand number of GPOIs, running on 5v DC. This will be controlled by an STM32 (STM32F103R8T6), running on 3.3v DC... |
H: Is HP 6623A Linear or Switching power supply?
I have an HP 6623A DC power supply and i wonder if its Linear or Switching power supply.
I see in the manual it says linear, but i still wonder.
Why i am asking:
I am asking this, becouse after probing my circuit, i noticed noise of 5MHz (680mV peak to peak) when curre... |
H: Could power cycling a modem 24 times a day for over 3 years (>30,000 times) cause the modem to lose its settings?
Could power cycling a modem 24 times a day with it being on for 10mins at a time for over 3 years (>30,000 times) cause the modem to lose its setting and revert to factory?
This modem.
AI: Sure, dependi... |
H: Writing function using sigma?
Suppose I was given:
$$g(w,x,y,z)=(x+ y ̅+ z ̅ )( w+ y ̅+ z ̅ )( w+ x ̅+ y ̅ )$$
Then I can write it like this:
\begin{align}
g(w,x,y,z)&=(ww ̅+x+ y ̅+ z ̅ )( w+ xx ̅+y ̅+ z ̅ )( w+ x ̅+ y ̅ + zz ̅ )\\
&=(ww ̅+x+ y ̅+ z ̅ )( w+ xx ̅+y ̅+ z ̅ )( w+ x ̅+ y ̅ + zz ̅ )\\
&=(w+x+ y ̅... |
H: define operation of a specific 555 circuit
I'm considering purchasing a pre-made circuit assembly with the following associated schematic:
Having looked at a typical 555 device datasheet, I'm unable to confirm the operating mode as the datasheet modes show the Discharge pin connected in some fashion.
What I would ... |
H: Can you use lower GBWP op amps for a filter requiring a higher GBWP by cascading op amps to get a higher bandwidth?
I was watching this youtube video EEVblog video on cascading op amps for increased bandwidth , and I was wondering if this can be used for 2-pole filters, including filters that are made up of multipl... |
H: What is the minimum current for my load to see TTL?
I have an inverter that can output +/- 25 mA.
I would like to split that output 3 or more ways, and deliver it to as many loads.
So my question is: how many times can I split it before the current is too low to reach a TTL level (5, 3.3 or 2 V)?
My loads' input im... |
H: Question about an Intel USB Host Controller power supplied per USB port
I had a general question regarding the Intel(R) 82801FB/FBM USB Universal Host Controller (ICH6). The ICH6 has five USB Host controllers in it, with (I'm assuming) two physical USB ports per controller.
My Question is, does the ICH6 or any Inte... |
H: How can I tell which alternative is used in PoE?
I need to disable the power over ethernet being output by a device to prevent any damage to routers and switches. After looking more into how PoE works, there appears to be two alternatives to how the power is sent over the wire.
Alternative A - Uses phantom power. T... |
H: How to determine I2C Master timing parameters
I am relatively new to I2C, but I have done much reading on the topic and I am confused as to the timing parameters necessary when designing an I2C Master.
I know of this chart from the manual on page 48.
However it gives a large range of possible values.
For example, ... |
H: Why are capacitor sizes rarely expressed in nanofarads?
Many capacitance values occurring in electronic circuits can be conveniently expressed in nanofarads, e.g. "a 10nF decoupling capacitor" .
However, the use of the term "nanofarads" or its abbreviation "nF" is often avoided and instead the numerically equivalen... |
H: Returning Current on power planes? (High frequencies)
For a 4-Layered design (Signal-Ground-Power-Signal):
I wonder that, I need both bottom signal layer and top signal layer for high frequency signals. I will use both of them for my high frequency signals. So do i have to carry about for my Signal-Ground-Power-Sig... |
H: What makes a "balanced" audio signal?
What is "balanced" audio exactly, and why is it useful? I've read that it means there are two voltages, with one being the inverse of the other. A balanced audio receiver looks at the difference between these, and calls that the "signal". Noise should affect both halves of the ... |
H: Connecting nine LEDs in series.. why the results?
I asked this before but I'm having problems still. I need to connect nine LEDs in parallel with a 9 volt battery. The wire leading away from the 9V separates into three and on each three are three LEDs in series. A calculator told me that if I have 2.25 volt, 28 mA ... |
H: How do I increase the output voltage of a simple electro magnet generator
I think I know the answer to this already but I can't seem to find this on Google. The keywords are all far too ambiguous apparently.
I want to create a electrical flow with a magnet passing through a cylinder wrapped with copper wire. Prett... |
H: Can you overcharge a capacitor with a lower voltage power source?
If I have a 5v capacitor and a 3v power source, and I connect the power source to the capacitor will it charge up to 3v then stop, or will the voltage rise above 3v?
AI: With a static voltage source, a capacitor in series will charge up until its vol... |
H: How can I determine if a servo motor is in the commanded position?
Once I have set PWM to move a servo to a particular angle, is there a way to detect that the servo has finished moving? I am concerned about situations where the servo is encountering extra resistance and is struggling to reach the desired angle.
... |
H: How to avoid a ground loop between pcbs
There is an enclosure with 2 separate pcbs. Pcb A amplifies a mV level signal (10Hz to 100kHz) coming from an external sensor.
The amplified analog signal is sent to pcb B, which digitizes it and processes it, and contains lots of digital circuitry (fpga, microcontroller, ... |
H: When people talk about a device "drawing" current, what do they mean? Why do devices under load "draw" more current?
In my (extremely rudimentary) understanding, the amount of current flowing in a circuit is determined by a) its resistance, and b) the voltage of the power source (voltage from beginning to end), whi... |
H: Step down 20V DC to 9V DC
What would be the best way to convert 20V DC to 9V DC? Can I use a simple potential divider network and regulate the output? If not, then what's the harm in it? I intend to use the output to power my AVR development board. I've seen people using complex DC-DC converters. What are the advan... |
H: Can I drive a low voltage stepper motor with an A4988 driver?
I have this stepper motor with the following specs:
Model: 17HS4417
Rated voltage: 2.55V
Rated current: 1.7A
Phase resistance: 1.5 ohms
Phase inductance: 2.8Mh
Holding torque (min): 40N-cm.
Detent torque (max): 2.2N-cm.
I want to know if an A4988 stepp... |
H: Gizduino atmega644 + Universal keyboard and display terminal (e-term)
I have a clone of Arduino which is GizDuino ATMEGA644 and a Universal Keyboard and Display Terminal (e-term). With this images
I connected the terminal to the microcontroller, after connecting that I tried to upload a sample program under the "Li... |
H: What if we want to clamp/clip current to a certain value or range as we do with diodes for voltage?
I have seen diode clamping/clipping circuits and can see that they can work well with such simple construction. However, what if we want to clamp/clip the current to some value rather than voltage?
AI: Here are a bun... |
H: Controller Area Network (CAN), high speed and low speed
Is the difference between high- and low-speed CAN only with respect to baud rate values?
Is the CAN transceiver programmable for a range of speeds or is it fixed for a specific value? For example, can a high-speed transceiver can be programmed for 500 kbit/s ... |
H: LM35 negative temperature sensing circuit
I'm planning on using the LM35 temperature sensor to measure both positive and negative temperatures. The recommended schematic to measure negative temperatures without a negative voltage supply is this:
I understand that the role of the diodes is to lift/offset the negati... |
H: How does a HCF4051BE multiplexer work, at a very simple level?
I'm a totally noob, so please, take this in consideration when replying :)
I want to understand how this multiplexer works. I tried to Google it, but all the answers was too advanced for me.
I mean, whats each pin is for? What happens when I send a sign... |
H: Consistency of the mains frequency throughout the UK
I'm working with a number of frequency meters which are reading the mains frequency in the UK from different locations. The problem is that I haven't been able to find information on whether there are local fluctuations in the grid frequency due to the geographic... |
H: ON/OFF safe implementation
I would like to know what you think about this. Here's a diagram presenting the main modules of the project. Red is 9V unregulated, green is 5V regulated, black is 5V logic exchanges.
I want to turn on/off the circuit. For the moment I'm considering :
Switch between the 9V DC source an... |
H: Arduino sketch not running startup method
I am trying to use the WiFly shield ( http://www.sparkfun.com/commerce/product_info.php?products_id=9367) with Aduino Mega board.
I am making modifications to the built in examples that ship with the WiFly. I have modified the sketch to make an http request to my personal s... |
H: Identification of Power Cable Type
I've searched and can't seem to figure out what power cord I need to get for this device. On the back it says:
Power: Input --> 100-240V, 50/60Hz Output --> 12V-2A 5V-3.5A
Thanks in advance.
AI: That's a Mini-DIN6 connector.
As for the proper voltage being supplied through it, ... |
H: 2 logical inputs on the same circuit
Is the below a valid circuit implementation and are there any things to watch out for? It's a simplification of the larger circuit but the crux of it is that I need to sink current into two GPIO input pins. The pins are signified by the 1 and 0.
Also, would a diode on the pins b... |
H: RX/TX led colors
I'll place leds on RX/TX to monitor activity.
Do you know if there's a kind of convention for the colors of theses ?
I've take a look on google but have found nothing.
(For now RX Red, TX Green, just to remember myself R ed-> R x)
AI: There is a CE guideline for indicator colors:
Red - fault, alarm... |
H: SD card access slows down with many files
I'm working on a data logger application using a MSP430F5529 running at 2 MHz and a SD card using FatFs. The SPI interface is already running at maximum frequency.
However I am seeing very erratic performance: even with an empty SD card, file creation times start getting sl... |
H: How to exit from the if statemet which is inside for loop and go back to the void loop in Arduino
My code:
#define MAX 10
const int LED1 = 2;
const int LED2 = 8;
const int LED3 = 4;
const int LED4 = 5;
int val;
int array[MAX];
int counter = 0;
int i;
int old_b = 0;
int error;
void setup() {
Serial.begin(9600);
... |
H: 12v LED Strip Lights controlled by PIR *Want to add LDR to project*
I want to add an LDR (Light Dependent Resistor) to my Motion activated stair lights, then On/Off switch can be removed as well as the single Led (On Indicator Only) from my project (I want the LDR to control the On/Off). This is basically the first... |
H: Use AC-DC adapter instead of AC-AC adapter
I'm building an O2 amp, which according to the designer requires an AC-AC adapter (Triad WAU 12-200) to convert regular wall power to 12VAC. By looking at the schematic for the amp however, it seems that I might be able to use a regular AC-DC converter (also 12V) instead.
... |
H: How does the pull down resistor work in this circuit?
Here's an image from another question:
I get what the pull down resistor is there to do, but I don't really understand exactly how it works.
When there is no voltage applied through the base wire, why does any induced current then go through R2, but when a volt... |
H: Smallest Voltage that a comparator can detect
What is the smallest voltage a comparator can detect?
Is it possible to set the reference voltage to a few millivolts, just above the noise margin for using a comparator circuit?
AI: The smallest voltage difference that a comparator can detect is a moving target: New co... |
H: Conditions for page write in EEPROM
I have learned about page write operations from App notes and data sheets of EEPROM chips.But i want to clear certain doubts.
I have an EEPROM chip which got 32KB and 64B Page Size.
1.Can i Write less than 64 Bytes?
Say n Bytes
If yes then What happens to the remaining locatio... |
H: Power demand calculation
The title says it all.
I'm currently working on an Arduino project. The project involves connecting 3 - 6 different shields non which is a "Motor Shield".
They are VR, brain wave reader, GSM, GPS, TFT screen, and a camera.
What is the right way to calculate the power needed to be supplied t... |
H: fgpa timing constraint on enable signal
I have a question regarding setting timing constraints on enable signals.
In my vhdl design I use an enable signal, to gate when the process needs to sample my input data. The enable signal is derived from the input data, using another vhdl component.
My clk is 27MHz, but the... |
H: What does this symbol indicate (line with brackets)?
I'm modelling a power system, and encountered a few symbols I have never seen before in a single line diagram.
I believe the first one is a switch with three possible position. Closed, open and grounded. Is this correct, or am I wrong?
I haven't got a clue what ... |
H: AT89c51RE2 replaced with AT89LP51RD2, ISP programming
have a question I can't seem to figure out the answer to. We have existing boards running off the AT89c51RE2 processor. Works great because it supports In-System-Programming. This means we can use BatchISP to program them very easily while they're already socket... |
H: Symmetric power sockets – design considerations in electrical devices
There are various single-phase power socket standards in use. Some countries use plugs that can be plugged in the socket only in a specific orientation (for example, the United Kingdom) while other sockets accept the plug in either orientation (f... |
H: control H Bridge using PWM
I wonder, if I can control the speed a motor by applying PWM on VCC pin at H bridge, not at control pins.
I try to do this with an Arduino microcontroller but the output will always be 5 volts!
AI: H-bridge usually has 3 pins for every motor.
2 pins are used for control, the third is norm... |
H: What exactly gets "worn out" and damaged by heat?
It's quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if they are not overheating per se.
If, for example, there's dust insulating a component in a PC, "cutting it off" f... |
H: How is the gain/phase vs frequency measured for opamps?
Opamp manufacturers post graphs like these in datasheets:
How is the data for this graph measured? Is it calculated using the mathematical model of an opamp?
AI: The trick to measuring open loop gain and phase for an op-amp is getting the dc conditions just ... |
H: Electric toothbrush charging time
I replaced my old Ni-Cd 1.2 volt sub-c battery (1500 mah) from my electric toothbrush to a new Ni-MH battery 1.2 volt sub-c (3800 mah). I looked inside the toothbrush and it look like there is no circuit that control the charging time of the battery, meaning I could overcharge my b... |
H: switch between battery and usb power no microcontroller circuit
Following an earlier question about how to switch between battery and USB power,
I would love to implement the TC2014 LDO as suggested by Russell McMahon.
That way I could switch between 4AA batteries (1.2V*4 or 1.5V*4) and USB power. The battery volt... |
H: Where can I find the datasheet for an DGL-0401YG-4EH LCD display
I recently bought a "goodie bag" or whatever it is called with a lot of different displays in the bag. I figured it could be useful someday or just to play around with. However it seems that the datasheet that was supplied didn't cover all the display... |
H: What design testing can I do before fabbing a PCB?
I'm an EE graduate who enjoyed the first taste of designing and fabricating hardware. My first board was a really low speed microcontroller board using mostly DIP and through-hole components, like something straight out of the 80s. It's very easy to translate to a ... |
H: MQ5 Gas Senor module - How to Callibrate
I have just bought MQ5 Gas Sensor module for Arduino, (http://www.dhgate.com/product/100-pcs-lot-gas-sensor-module-mq-5-lpg-natural/133345721.html)
According to the Data sheet,
"Resistance value of MQ-5 is difference to various kinds and various
concentration gases. So, ... |
H: Why can i connect my headphone to my computer whitout additionnal amplification?
I heard somewhere that computer soundcard can't output high current. That is why computer speaker has amplifier inside them and require some external power to power up the amplifier.
But what about headphone? I have a headphone that is... |
H: How does the tester screwdriver work?
How does the tester screwdriver work? If I put the tester screwdriver inside the "hot wire" of an electrical socket, it lits up if I press my finger against the metal cap on top of the screwdriver. This happens also if I stand on a surface of isolating material, such as wood. I... |
H: what is microcoded architecture in computer architecture
I want to know what is microcoded microarchitecture of an instruction set architecture (ISA) and why is it used? What is the difference between microcoded architecture and single cycle microarchitecture?
Please clarify with some examples.
Thanks
AI: Not all o... |
H: Design practice crossing clock domains and async signals
I have been designing a few projects on different FPGA's in VHDL, and it seems my most common source of "hard to find errors" is when I forget to synchronize an async signal, or forgets to resync a signal crossing clock domains.
My best weapon so far, has be... |
H: Differential amplifier offset problem
I have breadboarded a simple differential amplifier:
http://www.ti.com/lit/ds/symlink/lm158-n.pdf
what I expect is that OUT=B-A but that only works when the voltage of
B is larger than A+0.6, i:e there seems to be an offset of about 0.6V on the output.
Since the output LM358 i... |
H: What does overlaping indicate in i2c timing diagram
I am studying how i2c devices works...and I have downloaded a power point presentation from Google,
I have understood almost every basic concept, like, how the start and end of the transfer occur, what is SDA and SCL and what is master/slave.
but in this timing di... |
H: Difference between a bus and a wire
I have been studying buses used in communication systems. From what I read at Wikipedia,
"In computer architecture, a bus (from the Latin omnibus, meaning "for
all") is a communication system that transfers data between components
inside a computer, or between computers. Thi... |
H: Proper power design for a USB device
I'm designing a USB device that I want to be powered eintirely from a wall wart and have a couple questions concerning the power connections and ground loops.
1) If I connect the USB GND pin to the ground of the wall wart I should be safe from ground loops, right? My understan... |
H: 4 pin headset pinout / pushbuttons interface
You all know smartphone headsets. Most of them have a microphone integrated and additional pushbuttons for increasing/decreasing the volume or to pause the current track. I am wondering how this is working. The plug has 4 pins. I assume one pin is GND, two are for left a... |
H: Sony Vaio Inverter
My sony vaio vpcee3j1e laptop backlight doesn't work.Because the inverter is not working anymore. Since I have some urgent code to write, I need to fix it.I do not have any tools to make measures so i am trying to guess what could be the fault. The capacitors seems ok,but there is a component I h... |
H: How to sense 24V AC (Thermostat) with a 5V Microcontroller
I'd like to detect thermostat events (heat, fan, ac etc) with an Arduino. I've done quite a bit of investigation but haven't found a definitive solution. Most projects I see involve controlling the thermostat however I simply want to detect on/off events.
B... |
H: Is it possible to design this circuit with a single potentiometer (L-pad)?
I'm designing an L-Pad for my speakers. They attenuate the signal while keeping a consistent effective impedance, which is necessary for the amplifier and crossover circuits.
Typically, these values are computed and hard soldered, giving one... |
H: transistor characteristics - Ube0 number meaning
i'm trying to guess meaning of value marked as Ube0 in datasheets. (datasheet adress: http://www.datasheetarchive.com/dlmain/Datasheets-36/DSA-700258.pdf, the transistor I want to use is Tesla KF-508). I want to regulate secondary circuit by voltage divider on base. ... |
H: Can i use another H-bridge for this bipolar stepper motor drive?
I am driving a bipolar stepper motor with a H- bridge. For this sheet:
source
Can i use my L293DNE H-bridge driver instead of the pictured SN754410NE? Will there be any consequences for this?
I have earlier used the L293D chip for this design:
Needi... |
H: PCB etching from transparency
I wonder if someone could help me. A few days ago, my brother gave me all of his electronics, seeing that he doesn't need it anymore. I'm keen to learn electronics in depth and have basic knowledge such as resistor formulations, etc.
Scratching around in the stuff, I found something t... |
H: Power dissipation on chip vs. Over power dissipation
I was reading this pdf regarding computation from MIT's opencourseware and on p.8 through some obscure mathematical manipulation they basically reach the conclusion that the cooler you make your chips, the less heat is dissipated and the bigger the maximum integr... |
H: Common ground: Computer A and USB powered Arduino (MCU) from Computer B
I have 1 computer, 1 laptop and usb powered arduino ( MCU ).
Arduino is connected to laptop via USB cable. Laptop is connected to 220 V wall or
runs from batteries.
One pin from Arduino is connected to PWM input (to control fan speed) in comput... |
H: How to convert volts to dB SPL
I am taking input from an electret microphone amplified using LM358 amplifier from my PIC16F877A's ADC unit. I am getting the readings in volts from the ADC which ranges from 2.5V to 5V.
How can I convert these readings into dB?
AI: dB SPL is a pressure measuring unit.
You can't conve... |
H: How to make a digital clock using MSP430G2553?
I want to make a digital wall-clock as a small electronics project. Since I am very new to this stuff I want to just try to imitate some already completed projects so that I can learn from them.
I have a few sample pieces of the IC 553 and some other lower config ICS. ... |
H: Why is no capacity indication on regular batteries?
On every rechargeable battery there is an indication how big the capacity is (for example 2500 mAh). Why is this not the case with normal (nonrechargeable) batteries ? I tried to google the question but found no answer.
AI: The answer is: marketing. Some number, l... |
H: Coolpix L27 trigger mechanism
I plan to do a 3d scanner with low-grade digital camera.
I opened a coolpix L27 and found this :
Does anybody knows how this kind of button is called (may be it is normalised and finding a datasheet is possible)
Or would someone here have a service manual for the coolpix L27.
Thanks
S... |
H: What does 'integration density' mean?
What does 'integration density' in the context of integrated circuits and electronics mean? I've seen the term tossed around a lot, but I've never found a satisfactory definition.
AI: The "integration" is as in "integrated circuit". A high integration density means a large numb... |
H: Getting the direction that user is facing
I've just started playing with electronics and I'm wondering. As you guys probably know, using the iPhone you can get the direction that the user is facing.
My question is, what electronic component I need to buy to make a consumer electric device that gets the user direc... |
H: What is the simplest way to toggle a relay with analog feedback?
I've been playing with electronics for a long time, but am fairly new to digital electronics, including using Fritzing, so apologizes in advance for that.
I'm attempting a fairly basic 5VDC circuit where I want to use a thermistor to toggle a fan on a... |
H: Is my avalanche noise "random?"
I'm working on a hardware random number generator based on the below design. It uses two reverse P-N junctions to create avalanche noise.
I was looking at the circuit with my oscilloscope, and I found that the unamplified noise from the two junctions seems HIGHLY correlated. (Enough... |
H: STM8L discovery board, wires for the breadboard
I don't know if it is the right place to ask, but still
I have a STM8L discovery dev board - http://www.st.com/web/catalog/tools/FM116/SC959/SS1673/PF250636
which has very small square male-type pins. Of what I can measure, it is around 0.025" (or 0.64 mm), if to assu... |
H: Keyes IR receiver with Arduino
I'm trying to learn how to connect an IR Receiver to an Arduino Uno. I got this IR receiver as a gift, and I'm having a hard time finding a spec. sheet anywhere online. The module looks like this:
This brick comes with three pins: an S (which I assume it stands for VSS, a - (GND) a... |
H: Is it possible to create an HDMI input adapter for android?
Would it be possible to stream a video signal into an android device? I understand that the HDMI port it's self is not designed to take input, so I was thinking that the data could be streamed via the USB port. I know that the Apple hardware prohibits this... |
H: What's the interest for these breakout boards?
I'm wondering what's the interest for a breakout board or at least these ones :
Shift Register Breakout - 74HC595 - 2.95$
Shift-In Breakout - SN74HC165 - 3.95$
I'm wondering this because, take a look at the price, now take a look at the part price... Even in DIP pac... |
H: PWM'ed DC motor not running when loaded
I am trying to build a robot with the Arduino Uno and the H-Bridge SN75441.
The robot has 2 1.5V rated motors. I set it up with this tuto: http://www.mlbelanger.com/arduino/ard-bot/
So the circuit is like this (I have just not plugged the Arduino Vin pin in the pin 8 of the c... |
H: Decoupling issue with DC Motor?
I have the following circuit :
That's basically everything, excepted a button on DC1 to turn on/off the motor, but shouldn't impact.
The problem is, I was prototyping with the DC Motor on the LM7805 and the other parts powered by the +5V of the arduino I was using to program the AT... |
H: 4x4 keypad to Microcontroller
I have 8pin 4x4 keyapd, and i want to connect it to my microcontroller, I've search over the net but i can't see its pin configuration. I have a problem connecting it because of that can someone help me. I have a picture of the keypad and pin description of my controller here.
AI: Here... |
H: Raspberry pi with direct relay
I have a very back to basics question.
I've been using a 5v relay with the raspberry pi. The relay trigger is connected directly to an output pin and the other side is connected to the ground of the board.
I've been counting on the internal coil resistance to serve as over-current pr... |
H: Using a solar car battery charger to power a solar boat?
I am participating in a contest in which I need to build a solar boat (it has to fit into a 1.5' wide by 2' long by 1' high box and draw less than 2"). I currently have a 12V solar panel made for charging car batteries that outputs 125 mAmps and 1.8 Watts. I ... |
H: A question about how RS latches work and the time an input needs to stay high after it has been supplied!
I have a RS latch constructed of 2 NOR gates, without enable input.
Lets say that the in the beginning the output is set to Q=1, Q'=0. (pic1)
In a given moment R is pulsed high, and Q is calculated as (R+Q')'... |
H: Best way to detect when I'm home
I'm working on a home automation setup and I'm trying to find the best way for the system to know when I'm home. A motion sensor won't work because my wife or my dogs may be home when I'm not. The two things I almost always carry with me are my keys and my cell phone and I liked thi... |
H: What's wrong with this circuit to convert 0-5V to +10/-10V
I'm trying to come up with a solution to use the analog output of a DAC to drive the X-Y axis control of a commercially available laser 'closed-loop moving magnet' driver.
I found an explanation on how to use an op-amp to create a differential amplifier he... |
H: VHDL--counter for 7 segment display
I am writing a code that when the key(0) is pressed, the letter shown on the 7-segment display changes from the one to the next, like a to b, b to c. It starts from A.
When the letter reaches H, it goes back to A. However, when I press the key, the letter changes,but it goes back... |
H: Is there a schematic symbol for a supercapacitor?
Is there a schematic symbol for a supercapacitor, as distinct from smaller polarized capacitors?
AI: A supercapacitor or Electric double-layer capacitor (EDLC) is functionally no different from a polarized capacitor, at the schematic level-of-abstraction. Hence, the... |
H: I2C slave not pulling down SDA data line for the full clock cycle
I am communicating with some slave devices via multiple busses, however even though they are all the same device (http://www.invensense.com/mems/gyro/mpu3050.html) and all receive the same message/clock from the master, they don't hold the SDA line d... |
H: how do I connect a BN59-01006A samsung rc to an Arduino Uno IR receiver module
I have this remote control (BN59-01006A):
and this IR receiver brick(Keyes IR receiver):
I managed to connect the IR brick to my Arduino Uno. I downloaded this library and used a basic Arduino code:
#include <IRremote.h>
int RECV_PI... |
H: Solid State Electronics: Depletion vs Space-Charge region, what's the difference?
I'm studying Solid State Electronics (can't make much of it) but I was wandering what is the difference between space-charge region and depletion region in a diode or in a BJT or in a MOSFET. Are they the same thing? If not, can you g... |
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