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H: How does a smart phone measure battery percentage?
A smartphone (assume it to be an Android) usually displays the battery percentage from 0 to 100%. I am assuming that this is the usable capacity of the battery. I have several questions:
How exactly does it measure the remaining capacity? Assuming a battery is rat... |
H: Compiling C++ on EFM32 microcontrollers
I would like to use some high-level libraries written in C++ for my EFM32 microcontroller. Unfortunately the Simplicity Studio IDE for the EFM32 does not seem to support C++.
I am a bit confused about whether it is still possible to develop in C++ for this microcontroller fam... |
H: RGB LED audio spectrum analyzer - Bandpass or FFT?
I'm about to build a coffee table which has a RGB LED matrix build in it just like in this video.
https://www.youtube.com/watch?v=4NJDgvV8RZw
I want the matrix to display an audio spectrum that should be calculated in real time from a variable audio source over a 3... |
H: What is a DC DC controller?
I have heard about DC DC converters and I understand what they are but what is a DC DC controller? What is the difference between the two? Like this LM5085, I cannot understand the major difference between the converter and controller. Hoping for an explanation.
Thanks in advance!
AI: A ... |
H: How to run ATmega328P-PU using 3.7v Lipo 600mAh?
I want to run bare ATmega328P-PU using 3.7v 600mAh Lipo Battery. The Lipo is used to run Nano Quadcopter. The discharge rate is 20C.
My Question is:
1. Will connecting Lipo to my atmega directly fry up my chip?
2. Do I need any Voltage regulator?
AI: Page 2 of your d... |
H: Reading GPIO on TM4C123G board
With the TM4C123G board, I'm using Code Composer Studio v6. I want to read the GPIO pins that are connected to the user switches on the board (Pin F4 and Pin F0). The code at first did not work but after a search on the Internet it worked after I added this function:
GPIOPadConfigSet(... |
H: Meaning of TLC59281 LED supply voltage rating
TL;DR: Does the max VO of 17V refer to the LED supply voltage or only to what's left after the diode drops?
TI's TLC59281 is more or less a device that combines two 74HC595-like shift registers with constant-current LED drivers.
The datasheet advertises the feature "LED... |
H: PCB Layout, Functional vs Actual Pin Order
I'd like to continue this conversation here:
CAD Schematic pin arrangement approach
Basically, there are 2 major ways to do schematic symbols, either with true pin order or by grouping pins by their functions. More people seem to advocate functional groupings over true p... |
H: How does water damages the phone lines?
Today, we just replaced the phone line which was damaged due to moisture and were causing a great deal of disturbance and noise in the phone. What exactly causes this noise? Does the signals gets broken by the water entering the phone line?
AI: Too long for comment:
To expand... |
H: For embedded code, why should I use "uint_t" types instead of "unsigned int"?
I am writing an application in c for an STM32F105, using gcc.
In the past (with simpler projects), I have always defined variables as char, int, unsigned int, and so on.
I see that it is common to use the types defined in stdint.h, such a... |
H: Gold coated pads
Is there any difference between a gold coated pad and a gold pad? I have been ordering boards from OSH park, they are really good quality, I'm just wondering what benefits this has over silver or bare copper pads.
What are the benefits of usign a gold coated pad? I do know it must have better condu... |
H: uC Datalogger to GUI for dataprocessing
So I looked around electronics.stackexchange for this one and here is where I landed:
What type of USB Protocol for Datalogger
Basically, I would like to sample a voltage (specifically, from a photo diode through a trans-impedance amplifier) and send it to the PC. Though, I j... |
H: Op-amp: amplifying DC bias problem in output?
I'm trying to do a simple 1 kHz, 1 V p-p sine wave amplification circuit using a TL071 or similar op-amp. The simulation is currently in LTSpice.
I've biased the VCC to half to try to achieve a good voltage swing but the waveform clips; it seems that the op-amp is ampli... |
H: PCB Tinning to increase current
How can I design a PCB in order for it to have this kind of PCB Tinning finish?
I do know this decreases the resistance of the tracks and increases the amount of current it can handle however
Do I need to leave the solder mask below and do it by hand?
Do I need to remove the solder m... |
H: Circuit Requirements for a 30 min continuous on off cycle
I would like to build a circuit (preferably using components from old common electronics like a VCR or whatever) that continuously cycles on/off in ~ 30 min intervals. Input voltage is from a 12v groundless DC inverter that's plugged into the wall. The 30 mi... |
H: What would be the best microcontroller for running PID calculations?
I need a microcontroller for my line following robot.
Which one would be the best considering a price below $30 and preferably >120MHz clock?
AI: You can run PID on just about anything, it's mainly a question of how quickly you need to update. Ho... |
H: 4518 and Arduino
First off, disclaimer; I'm a computer scientist in the progress of my first baby steps in electronics.
I'm trying to hookup a 7segment with a 4511, 4518 and an Arduino.
The 45-series chips and the 7segment are receiving 12v, while the Arduino is getting 5v.
I've confirmed that each part of the syst... |
H: H-Bridge vs Mechanical Speed Controller
What's the difference and trade-offs between a h-bridge motor controller and a mechanical speed controller for controlling a brushed motor in an RC car?
I have a cheap RC car that I'm trying to retrofit with an Arduino to convert it into a semi-autonomous robot. The car comes... |
H: does 0,7V supply on 5V devices damage the device?
In a certain state of my circuit there will be 0,7V on the supply pins of certain IC's (comparator & current sensor). Of course the IC's won't work on this voltage but does this damage the IC's or can I ignore it? The voltage is caused by a diode (it's leaking some ... |
H: Is controlling a voltage regulator's EN/SHDN terminal directly by 3.3V microcontroller possible?
Let's take the LT1763. The datasheet says that "The SHDN pin can be driven either by 5V logic or open-collector logic with a pull-up resistor."
On the other hand the chart "SHDN Pin Threshold Off-to-On" says about 0.7V ... |
H: 555 timer one-shot 30 second light LED strip, TOTALLY CONFUSED!
I'm working on a personal project and I am at my absolute whits end here. I have a configurable N.O. or N.C. switch (nteinc Magnetic Alarm Reed Switch) so I'm not too concerned with which way I use it.
My goal is as follows:
When the two parts of the... |
H: A relay for each terminal (live and neutral)
I'm investigating a control circuit that switches a heating element. From what I can see there is a relay on both the neutral and live to the heater. The relays are controlled together and cannot switch independently.
Is this common for controlling a heating element? Wh... |
H: Uses for gate expressions, Nor and Xor
I'm not generally confused by Electronic Engineering, but Nor and Xor are the Gate expressions that like to break that Rule.
I can't find proper answers to this question, as they are either:
Too Complex. Or too Uninformative.
No and Yes, I and O are quite simple, but i stumble... |
H: 0,5m led strip (15 leds) Phone Power Supply
I have a 15 led 0,5m led strip (ws2812b). Since it's such a limited amount of leds, I'll try to power the strip with an old phone power adapter (5v / 750mA). I looked at the ws2812's data sheet and it says
Each RGB LED draws approximately 50 mA at 5 V with red, green, a... |
H: How to program a msp430 without bootloader or ISP connector?
I'm looking for a way to program a msp430 microcontroller in-circuit and with all the components SMD, including the ISP connector. Could, in this case, USB still be an option?
AI: The MSP430 launchpad and other TI's evaluation boards have a proprietary JT... |
H: Is soldering extra wires to increase current capacity on a pcb trace good design?
I was working on a bunch of PC PSU organ donors and noticed that on lots of them through all the wires that lead the power to the outside there were wires soldered, and lots of solder added. This is probably to increase current capabi... |
H: What is the difference between processor clock and system clock?
In the TM4C123G Launchpad Workshop page 129, there is a note about power modes. This note differentiate between processor clock and system clock. So what is the difference between them ? Is this a general concept or is it specific to the TM4C123GH6PM ... |
H: Will GPIO still be available when connecting a BoosterPack on any Launchpad?
I had this question in mind while exploring the BoosterPacks for the TI Tiva C series launchpads. Let's say you connected KenTec display to the board, you still have access to the female headers on the bottom of the board. The question is ... |
H: Phase Response Measurement
I have built a few analog filters (LPF, HPF, etc), after the filters, there are some amplifiers, MUX, and it goes to a ADC. For this project I am suppose to have as much of a linear system as possible. So I am wondering how I can measure the phase response of this system (0-60KHz, from th... |
H: How can I measure the current drawn by a soil hygrometer?
I have one of these ubiquitous soil moisture sensors:
The only information I can find is that it operates from 3.3V to 5V, uses an LM393 to trigger a digital output and also exposes an analogue reading.
I'm intending to hook it up to a low power PIC (actual... |
H: Is hardware flow control necessary?
I want to communicate using a serial cable to a device that uses RTS/CTS flow control and 115200 baud speed. I want to use this Sparkfun TTL to rs232 adapter, but it has no RTS or CTS pins. What can I do to get hardware flow control or is there a software solution?
AI: The softwa... |
H: How does Ohm's law extend to Z if Z is complex?
We know that impedance, Z, is complex.
I'm told that $$V = IZ$$ But that rearranges to $$Z = \frac{V}I$$
But both voltage and current are real numbers, so how can a real number divided by another real number give a complex number? What have I done wrong?
AI: Complex \... |
H: Using infrared temperature sensor to measure water surface temperature
Not sure I choose the right place to ask the question, but... Can I use infrared temperature sensor (such as TS118-3) to measure water surface temperature? I'm afraid some effects as reflection of infrared waves from water surface and blinking b... |
H: Rotary Switch terminology
I am buying a rotary switch, and I have found these terms:
2 x Off/(On)
and
2 x Off/On
Could you please explain me the difference?
edit:
example of a switch with Off/(On) specification
(originally from this page)
AI: Usually positions in parenthesis are momentary positions.
So a switch ... |
H: Why don't brushless motors "short"?
You always learn in school that you should never short terminals of a battery because the wires overheat from the large current.
If you look at a brushless motor, you'll see that its nothing but coils of wire. So why don't these motors "short" the power leads? How is this any d... |
H: How to analyze analog circuits with transistors [is this circuit immediately analyzable to anyone]?
I'm not experience in making electronics, but I do have a working knowledge of basic circuit laws and such, but we never covered something with transistors such as this BFO metal detector circuit I've been making as ... |
H: If I were to discharge, recharge, discharge, recharge,..., an electronic equipment, would there be any negative effects?
Would there be any damage to a laptop or another electronic equipment if I use the internal battery supply till it has been completely depleted, then I recharge it to maximum, then wait for it to... |
H: How does a laptop maintain battery at full?
I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum.
I am unsure whether the laptop would switch to take power solely from the power supply or would the battery be repleni... |
H: How does this battery simulator work?
I'm trying to understand how the battery simulator circuit described in the Linear Technologies Application Note 58 works. Its schematic diagram from Appendix B, page 35 is below.
The application note starts the circuit description (about its charging mode - which is what I'm ... |
H: NE555 Timer Problem
I need help using an NE555 timer to flash an LED.
Here is my current set up:
All resistors are 220 Ohms and LED is link
The capacitor is 10uf and same result happens with 1uf. I am using a 9V battery.
Description: The LED Blinks on when given power and stays off indefinitely immediately after ... |
H: Using a TFT display that has no controller
I have been using LCD screens (with the controllers) for my projects for a long time. Now I thought of learning how these screens actually work, the part before they go to the controllers.
Well the idea came to my mind when I managed to scavenge an old working screen ou... |
H: Power supply draft advice
I've attained most of the material I need to build my first power supply. The specs are mostly dictated by the parts I have. My intention is a dual isolated variable output power supply that I can connect in series to give negative voltages.
Below is the "final" draft of the circuit that I... |
H: How long/big is an I2C acknowledge?
I'd like to know, how long/big should be an ACK from a slave to its master? I am communicating with a module using the I2C protocol. But the large blank space in the middle, is this an ACK from the slave to the master (µc) as expected?
Whole view
Close-up left
Close-up middle
... |
H: Why is earth used for ground? Literally earth?
I never considered earth to be particularly conductive. It's just dirt, after all.
However, I've seen "earth ground" conductive stakes driven into the ground in order for electricity to be grounded, because it will find its way down there.
However, it never made sense ... |
H: Help Identify Faulty Component - Dishwasher Controller Board
Not sure if this is the right place to post this.
Recently my dishwasher gave away :(. It works fine (goes through wash - rinse cycle)when empty but the moment it is loaded, the display lights go weak and start dying the when it enters the rinse stage.
I ... |
H: Boost converter simulation keeps getting fried
In my project I want to use a couple of old russian VFDs. To drive them, I need 28V from a 12V power supply. The plan is to use a DC-DC boost converter as calculated here and here.
I've ported the designs to Yenka, a circuit simulator, but for some reason the MOSFET a... |
H: Car radio output voltage
I am working on an amplifier for a car radio for a friend of mine. He is away for few weeks so I can't measure the radio output.
That's why I am asking here, does anyone know, what's the peak-to-peak voltage from car radio, that then goes to the amplifier?
Is it universal, if not, how do t... |
H: What makes a precision op amp precise?
I'm making a dummy load which can draw 5V/3A maximum, but can also draw small loads (e.g. to drive an LED array of 20mA).
simulate this circuit – Schematic created using CircuitLab
I have selected a 0.5 Ohm shunt resistor after looking through a bunch of datasheets of mosfets... |
H: What OpAmp configuration is used in this circuit?
I'm studying basic opamp configurations and was trying to determine which configuration was used in this battery simulator. Its schematic is below.
The circuit description, from this application note, is below:
In charge mode, current is forced through the battery... |
H: What does this PNP transistor + OPAMP circuit does?
I can solve the circuit for given DC input voltage with transistors Ies and alfa values. It amplifies the input signal for like 13 times. (Not linearly). But i couldn't understand the purpose of this circuit. Could you help me with that? Thanks in advance
AI: Thi... |
H: pcb etching: chemical method or milling
i'am actually intending to install a small pcb production process (100 pieces per day)
and i am still hesitating on the etching method: chemical or with a milling machine !!
I would prefer a cnc machine but would it produce industrial standard pcb's ??
And do you know some g... |
H: Best way to get 256 io pins?
I'm connecting to an arduino or raspberry pi and would like to have 256 io pins. I found a 16bit io expander which has 8 unique addresses for 128 but that's the max I can do on i2c. Any other thoughts on how to expand my io ports?
AI: You can put an I2C Multiplexer in there between the ... |
H: Boost 5V to 18V: charge pump + LDO or conventional boost converter?
I am trying to build a H-bridge driver using discrete parts. Now I have a problem regarding generating the 10+V gate voltage for the NMOSFETs I used.
The H-bridge and its controls is like this:
simulate this circuit – Schematic created using Circu... |
H: Do carbon film resistors have any effect on AC?
Carbon film resistors are basically an insulating (probably ceramic) rod covered in a carbon film that is twisted around it, as shown in the picture below:
However, this seems very similar with a coil. I know that on DC, there is no problem, but this shouldn't have s... |
H: How to Step Down a Low Voltage (≤1.0v) DC Signal by a Factor of 0.9 or 50mV Static?
Alright you e-lectronic masterminds, I've got a predicament that I'm not quite sure how to solve. Basically, I need to take a 20mA DC voltage signal that varies between 0.1v and 1.0v several times a second (~20Hz) and step it down ... |
H: Why do we need pull-up resistors or tri state pins for AVR external interrupts?
Let's say we need to write a program for ATmega32, that reacts to an external interrupt(INT0) through the pin D2. The interrupt is to happen during the falling edge of the signal.
I noticed it in the books that
DDRA = 0b00000010 is done... |
H: -1.2V from LM337L negative regulator?
Here is the datasheet for this device: TI LM337L, at the 3rd page there is an equation for calculating the resistor needed in the voltage divider to set the output.
-Vout = -1.25 * (1 + (R2 / 240))
The 1st thing that I'm wondering about is the value of the lower resistor (240 O... |
H: Convert 5V to 3.3V without logic level converter
I've got a 2.2 SPI monitor (QVGA TFT monitor & SD Card), but I am using Arduino UNO board. All pins are 5V. How can I use a resistor to communicate between TFT, SD and UNO?
I have lots of different Ohm resistors, and have 3 Logic Level Converter (non bi-direction).
... |
H: smooth ac to measure with dc voltmeter
I bought a couple of those 3 digit 0-30 volt dc voltmeters. Im taking ac 0-24 volts (Lionel train transformer) through a rectifier and measuring it with the led meter. My problem is the meter never settles?
I was thinking a cap across the +- on the rectifier but since I don... |
H: Y or Delta connections advantages / disadvantages
I have been studying three-phase systems for the whole course of a subject (on the first year of the university degree). I have finished now, and I know both "Y" (star) or "Delta" (triangle) connections. I have made a lot of computations with them, however I don't k... |
H: Li-Ion Charging - Constant Voltage Stage
The charging curve for Li-Ion batteries (explained here) has a final constant voltage stage where the charge voltage plateaus and the charge controller slowly shuts off the current until it reaches some threshold (10% in the video's example) and charger considers the battery... |
H: Is a toy's remote controller interchangeable?
This Christmas I'm buying a couple people remote controlled quadcopters. Then it hits me. Is there a possibility that the different remote controllers will crosstalk and wind up controlling a robot that it is not meant to control?
How do electronic engineers ensure that... |
H: Why do people state their circuit uses transistors?
I'm pretty new to circuits, and still don't know exactly how transistors work, but when I search up a tutorial for circuits that include Transistors, they all have in the title, "One Transistor This", "One Transistor That".
Is there any specific reasoning behind ... |
H: ICSP or Pre-Programmed Microcontroller
I've designed a PCB for small scale production; currently I'm hand soldering them in batches of 20 at a time. This PCB uses an ATMEGA168 microcontroller which I program before soldering to the board - this method works well for me at the moment.
I'm looking at having a batch o... |
H: Single issue and Dual issue architecture
I am studying the PowerPC architecture on the MPC5644B. The documents from Freescale mention it to be a single Issue architecture.
The data sheet states the following,
• e200z0h single issue, 32-bit core Power
Architecture compliant CPU
— Up to 80 MHz
— Variable length encod... |
H: Basic voltage divider issue in my amateur circuit XBee
Once again I need your help in my project. I have a 4,5v powered circuit. I put a voltage divider with 2 resistors in series to reduce my initial voltage of 4.5 V to 3.4 V (to feed an XBee module).
The issue is that if I do not connect the xbee, the voltage div... |
H: LED as Zener: is this a good way to lower the BOM cost?
I had an old AM radio board designed to operate with a 3V CR2032 coin cell. I want to revitalize this old junk with as few parts as possible and convert it into a USB-powered AM radio with a built-in speaker. Parts I have for this project include three caps, t... |
H: Thermal grease / adhesive: Higher Conductivity & Lower Impedance or vice-versa?
I have been reading a fair bit about Thermal grease & adhesive comparisons.
There is a lot of information out there - even including tests made with tooth paste(!), which is mind blowing for me.
I have access to a limited variety of the... |
H: Transistors to switch 12V 2A
I need to switch some power to a device, so I was wondering, if this will work OK, or do I need to add some other stuff to protect it, or make it work correctly.
I ran some simulations, on CircuitLab, and according to them this should work, but I would like, the opinion of other profess... |
H: Output of Compact Fluorescent light (CFB)
I have few unworking Compact Fluorescent Lights and i was wondering what is the output of the circuit?
AI: The output is a high frequency sine wave. The voltage depends on the type of the tube. Typical voltages for CFL are 60V, but can vary vastly.
The oscillation is perfor... |
H: Can varnish affect the performance of the air gap in an SMPS transformer?
In the past I have built several switched-mode supplies using off-the-shelf transformers just using the datasheet properties without having to worry too much about their construction, however I am working on a flyback design at the moment for... |
H: How is U1 powered in this schematic
This is taken from an app-note on the ONSemi NCP1014. Pin 1 of the NCP1014 is Vcc, and I don't understand how it is powered in this configuration. The datasheet linked above mentioned a dynamic self supply powered by charging a cap on Vcc but I'm really not sure how that works gi... |
H: SPICE model of DRAM
Is there a SPICE model for DRAM developed? I am interested in any type of model at any level starting from DRAM memory cell and towards to whole memory VLSI circuit. I am seeking for a DRAM operation tutorial that includes examples utilizing SPICE.
AI: Your question is frankly a bit too broad (a... |
H: Step size for controlling stepper motor
I am using a PK243 - 03A unipolar stepper motor, its step angle is 1.8 degrees. I am planning to step the motor periodically on it's starting frequency which is coming out to be 1.3kHz, to see how it makes 200 steps per revolution, what I cannot decide is the step size of the... |
H: Resistance Wire Circuit Safety Around Water
I'm working on a project that requires heating of a copper pipe with water running through it. I'm aware that this is a common issue by itself but as there will be people working around the system and the pipe has condensation running down it I am looking for some safety... |
H: Controlling 2 relays with 1 Open-Collector output
I had a board with open/collector output pins, and i need to control 2 relays syncronioulsy (open and close at the same time) with 1 open collector output. So how can make the connectıon from pin to relays?
AI: It will be necessary to understand the current sinking ... |
H: EEPROM Reading/Writing without Use of Programmer
I am designing a small password based door lock project which is fully made from logic gates and ICs without the use of any sort of programmable devices(it is a simple university project for the Logic Design Course).
And as assigned to me, I need a non volatile memor... |
H: AD620 in-amp reference pin
I have a weighing scale project using a 200kg load cell with a rated output of 1mV/V. I used 5V as excitation voltage and an Ad620 in-amp for my amplifier. I only need atleast the 0-100kg so I only want to amplify the 0 - 2.5mV part of my output which I believe corresponds to the 0 - 100k... |
H: Resistor colour code chart
China has recently changed the colour code for resistors.I searched on google but it didn't show the real value of the Chinese 4 band resistor.Please help!!!
AI: More seriously, are you sure you don't have a 5-band resistor (typically used for 1% and better resistors) and you're comparing... |
H: Why gate - source and not gate - body voltage?
Considering an NMOS transistor with separate body and source terminals, with the following voltages: Vd - 10V; Vg = Vs = 5V and Vb = 0V, why wouldn't it conduct?
Isn't the channel of electrons formed mainly because of the potential difference between the gate and the b... |
H: Frequency response of 2nd order RC low-pass filter
I am trying to calculate the frequency response of the following circuit:
simulate this circuit – Schematic created using CircuitLab
The two extra GND points are used to show that Vi and Vo are measured in relation to the ground.
Here are 2 methods for this:
Met... |
H: Power Efficient GSM modules
I am developing a Kit with GSM module which have to receive and send commands. I have gone through many GSM modules(SIM900). All of them consume around 1.5A at burst time. So I am in trouble to develop a power efficient Kit.
My doubt is normally mobile phone battery has the capability of... |
H: Automatically upload binary file to nucleo after compiling in Keil
I bought Nucleo F411RE and I'm using Keil uVision 5 as IDE for programming it. To download program to Nucleo, you simply copy it in the virtual nucleo drive:
Of course, I'd like to have this task automated. To do so, I tried to use the Keil project... |
H: Why erasing SSDs in increments of entire blocks does not damage adjacent cells?
I know that to avoid corruption and damage, SSDs are only erased in increments of entire blocks. But how does that not damage adjacent cells? Why energy-intensive tunneling inhibition isn't necessary when you're whacking a whole bunch o... |
H: Is there a common name for this [voltage-boosting] circuit topology/idea?
In the OPA454 datasheet I found an interesting circuit idea that I'm not sure what is it usually called (if there is a common name for it).
It involves using two opamps to shift the rails of a 3rd one. Note that unlike a bridged [tied load] ... |
H: how can i using CPU8085 and PIO8155 crate an alarm circuit and program
example ; we have smoke sensor, speaker and my circuit.When Sensor has been active, speaker to sing it. i'm newbie in this topic. how can i do it like this circuit ?
AI: I'll make an exception to the no-homework rule.
1) Configure the 8155 to ha... |
H: Should I ground an aluminum front panel?
I am building a power supply and it will be housed in a plastic case with a fan. I understand the wisdom of grounding a metal case, but in my case (no pun intended) I have an aluminum front panel. Should I ground it? My feeling is yes, but I want to know if this is correct a... |
H: clk prescaler with possible glitches
I‘m new here and have the following problem. I have developed a module in vhdl which scales the frequency of an input clk by the input prescaling value (0-255) s.t. the frequency of the output signal is f_out=f_in/(1+prescale).
My design works fine in simulation but from past un... |
H: Confused with mesh analysis
something about mesh analysis confuses me and I can't find an explainaton anywhere, as you can see on this picture (it's in French, but the schema and formulas should be enough to understand)
They bascially explain how mesh analysis works, and that's fine and all, I understand the formu... |
H: Amplitude Modulation Frequency
In am receivers, we detect the modulating signal by using envelope detector. So, the diode rectifies the signal, and the detected signal has doubled frequency than the original. Does this mean we will hear distorted sounds, if we connect audio amplifier. Is it possible to decrease the... |
H: half bridge IGBT not switching high side on
I have designed a PCB with a FAN73933 half bridge driver. It is designed to drive 2 IGBTs (FGH40N60SMD) with +- 170V rails. I have attached a schematic for better understanding. The problem is I can not seem to get the high side to turn on. The system uses a boot strappin... |
H: Modifications to 555 LED Fade Circuit
I was looking for a circuit to fade an LED on and off using no microcontrollers, and found this nice circuit:
http://www.555-timer-circuits.com/up-down-fading-led.html
it seems like exactly what I was looking for, so I went ahead and used it with a few changes:
I used a 2n2222... |
H: Get +12/-12VDC out of 24VDC Supply
I'm trying to use a single 24VDC power supply but rig it to give a heating coil the equivalent of 24Volts but at +12/-12 in reference to ground for safety reasons. Is this as simple as a voltage divider with a high value resistor to ground? Would that work or just kind of short ... |
H: Can you setup UART Reception on dsPIC33EP512MU814 on eval board dsPICDEM MCLV-2
According to microchip, the dsPIC33EP512MU814 can be integrated with the dsPICDEM MCLV-2 Development Board using dsPIC33EP512MU814 Plug-In-Module
However, according to the dsPICDEM MCLV-2 Interface map the UART Rx and Tx of the evaluati... |
H: Buffering a constant current source IC to increase maximum voltage rating
The actual question: Which of these configurations, if any, is the most effective for my goal of increasing the maximum voltage rating of the outputs of a constant-current driver IC?
As established in a previous question, a constant current s... |
H: How do I wire my 4066N analogue switch
I plan to use one of these to throw two switches at the same time:
http://www.digikey.ca/product-detail/en/74HCT4066N,112/568-7854-5-ND/1230913
The switches should be closed when the voltage from this debounced circuit is high:
Which diode to use on my RC switch debounce circu... |
H: Long-range RF comm with decent data rate
I'm building a quadcopter powered with Arduino. For testing purposes, I'm currently using bluetooth. In the future, however, I would like to have some form of fairly long range communication that also has a respectable data rate. The reason is that eventually I'd like to att... |
H: How to I wire this particular variant of 2.5mm female jack?
The second image has the pins not the top one.
Now the pinouts are a bit confusing here. Now, I've wired a jack before but none like this. Can someone please help me out?
AI: As you insert a plug into the jack, some of the pieces of metal inside will mov... |
H: Do electret microphones have polarity?
So do electret mics have polarity?
The following circuits seem to contradict each other...
1)
2)
Now the problem is one image shows polarity while the other one does not!!
What's the holdup here?
AI: Yes, they have polarity and it has to be right to work- the output needs t... |
H: What encoding is used in this signal?
I have a cheap wireless pool thermometer (AcuRite 617 1) and I'd like to intercept the temperature data at the receiver and use it with a computerized data-logging system.
Conveniently, inside the receiver is a small break-out board that is connected to the antenna and has digi... |
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