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H: Help with delayed smoothing code
I'm hung up on how to smooth analog sensor data in a specific way. Math/code is not my expertise so thanks in advance.
My sketch needs to listen an AnalogPin and smooth/remove any outliers as the values change, though smoothly settle on the final AnalogPin value.
Ex. if the sensor i... |
H: Identifying live, neutral, and ground wires cold
I have a European (230 volt AC motor, no markings), 1 phase (I think). It is roughly 6 inches long, just to get a sense of the scale.
It basically wobbles when current is supplied to it.
1) I need to figure out which leads connect to ground, neutral and live.
2) ... |
H: DS18B20 temperature interpretation
I have a problem interpretting the temperature reading of a DS18B20 chip. There is a certain situation I am not abble to resolve. This is the example temp table for the chip from the datasheet:
an example for reading of -0.5*C is shown as FFF8. Cutting off the 4 LSBits we get 0x0... |
H: What could this scammy "magic whole-house electronic powersaving surge protector box" have actually done?
My parents had good intentions, I guess, but the company that sold them this bad boy probably didn't. After blowing a fuse at their place, I noticed this box hooked up to the breaker panel. It was hooked up to ... |
H: Controlling output voltage (12v to 0-12v 5a)
I'm having a problem finding the right circuit/device for a circuit I need to make (I'm quite a noob). It doesn't matter what the input voltage is, but I need an output voltage which I can digitally change from 0 (or at least the lowest possible) to 12 volts. It needs to... |
H: How much resistance will I need to drop the voltage?
9 Volts is applied to circuit. There is a LED which runs on 3 Volts. I want to drop 6 Volts. how much resistance (\$R_1\$) would I need for that?
AI: The short answer is: Any resistor will drop 6V.
The LED has a fixed drop of 3V. All the rest of the voltage has ... |
H: What happens to a polarity sensitive capacitor when you feed a square wave through it?
Consider the following circuit.
simulate this circuit – Schematic created using CircuitLab
The output wave form will look like this
Orange - input signal
Blue - output signal
The Wikipedia entry on Electrolytic capacitors says ... |
H: Do I have to power-on reset CMOS counters?
I am designing a project that contains several CMOS counter ICs (CD4017 specifically).
What is the state of the counter on power-on? Do I have to incorporate circuitry that pulls the reset pin high on power-on to ensure the counter starts at zero?
I checked datasheets from... |
H: Transistor fuse problem
I can't find out how this transistor fuse works. I know that the R1 is there because of voltage drop 0,7 V when the voltage on output is at its highest possible value. But I don't understand why there is the diode and reverse biased. And my next question is how the transistors operate. How ... |
H: Current capacity of very thin (0.1mm ~ 0.5mm) copper wires?
I am looking at this very thin copper wire. It does not have much description other than the physical dimensions. What's the maximum current capacity of these wires? I guess they are not for power wiring (~ 200mA)?
AI: That all depends on the length.
There... |
H: Output Units of Soil Moisture Sensor
I have an Octopus Soil Moisture Sensor connected to a Rasberry Pi through an MCP3008 ADC chip. The sensor is working correctly, but I have no idea what the reading values mean.
I say its working correctly because when I place the sensor in known dry soil and take a reading, I g... |
H: Can I do this (MOSFET instead of switch)?
This might be a very trivial question: Can I simple swap a switch that is connected to a RESET pin with internal pull-up with a N-channel MOSFET?
My goal is to pull the RESET to ground using a signal (OUTPUT) instead of a switch, but not sure if it is this simple?
So can I... |
H: How accurately can an ESC detect the number of RPMs?
I am working on a project involving brushless motors, so I got an ESC to power them. The problem, is that I need to accurately control the number of RPM.
Can an ESC, like this one, control the number of RPM the motor is doing? Or is it based more on percentage of... |
H: Developing an intuition about this circuit
I am trying to gain an intuition with circuit analysis by going through MIT's free course on intro to electronics. Question S2E3 presents the circuit below. I solved the problem (find all currents at nodes and voltages across elements) by applying KCL and KVL and doing s... |
H: PWM Modules vs Channels
I don't seem to understand, when a manufacturer states that their microcontroller has 2 PWM modules but 8 channels, does this mean I can drive only 2 motors but I have 8 pins (channels) to choose to output my PWM?
AI: That particular PIC has two "simple" CCP modules (that can be configured f... |
H: Type "X2" line filtering capacitor failing as short circuit
I recently plugged in an old Apple IIGS that had been sitting in a basement for almost 15 years and it worked for awhile before blowing up in a smokey mess. The reason for the smoke was easy to diagnose, one of the line filtering film capacitors had explod... |
H: Does "Connected" mean solder together?
Looking here, I am shown that the connecting symbol, means the wires are, literally "connected" as shown below.
I am currently working on trying to decipher an FM Radio schematic, but am having trouble with this "connected" thing...
On the above schematic, I am shown that a... |
H: How can I tell if a given MOSFET can be fully driven by 5V TTL high signal? (what should I look for on the datasheet?)
How can I tell (by reading the datasheet) if a specific MOSFET can be turned fully on (with the minimum drop) with simply 5V on the gate? (assuming 5V or 12V potential between the drain and source)... |
H: RMS measurement/calculation On-the-fly
I have an SAR ADC to measure the RMS value of an AC signal. My present method is to use a timer to trigger the conversion and store the conversion result. When I've sampled a whole cycle of points, I subtract the DC level (the average of all points) from the signal then use th... |
H: What is Subsampling in image processing?
I was going through some image processing document. And I came cross this term "sub sampling". What does it mean? Is it sampling again already sampled data .. ?
AI: Subsampling does not necessarily mean resampling previously sampled data, although it often gets implemented t... |
H: Use of 100K ohm resistor along with 0.1uF capacitor?
In the circuit diagram below, why is there a 100KΩ resistor (NOT R2) connected to the capacitor? To my understanding the capacitor-resistor act as a high pass filter to block the DC offset of the microphone, but since only the capacitor blocks DC why is the 100k ... |
H: Long term voltage change - analog voltmeter, op-amps and logarithmic scale
I want to display one minute voltage change on analog voltmeter.
Voltage change: from -0.5V/min to +0.5V/min.
My analog voltmeter has 0-10V scale (I will replace it with homemade printed scale).
I don't want to use any microcontroller, PWM... |
H: Steady state response and transfer function
For an LTI system in frequency domain, Y(s) = H(s)X(s), where symbols have their usual meanings. I am confused in what this represents, i.e., is it true only in steady state (in other words is it only the forced response) or is it true for all times including the transien... |
H: How to solder with one hand?
I am a beginner at electronics.
I don't have many tools and stuff, so I am forced to solder by hand.
I don't have a pcb to solder on, so I usually just solder the wires together, but it's really difficult without a holder.
Is there an easier way to do this? If not, is there a substitut... |
H: Understanding The Art of Electronics mathematical explanation for capacitors
The author mentions that the reader should not worry if they cannot keep up with the mathematics, I however feel uncomfortable doing so. The issue is the fact that the author does not explain what the mathematical variables are for so I wo... |
H: Atmega328 to SD card issues
I am working on a board that includes an Atmega328 which needs to read data from an SD card. I am having problems. Here is a diagram:
I believe the issue may stem from the voltage divider that is connected to The hex converter (74HC4050D) and the micro SD card. However I have tried rem... |
H: BJT Astable Multivibrator
I have the basic knowledge about multivibrators, but I did not understand the working principles of the circuit schematic provided down below.
I have done the basic research about how it works, but I could not understand this particular BJT Astable Multivibrator circuit. Could someone ple... |
H: Op amp noise specifications at DC
One thing I've never quite understood about noise specifications is what happens if your circuit uses DC only -- yet all specifications for noise make reference to a bandwidth.
I have an instrumentation amplifier. Let's say the thing I'm measuring is a DAC, with a spec'd noise leve... |
H: Transfer function of an op-amp circuit
Let's suppose the following circuit:
I am trying to find a relation between Vs, V1 and V2 in this circuit. Please note that Vs is measured in relation to ground. I have declared some extra points (A,B,C) on the circuit and using voltage divider laws and the properties of an i... |
H: Would adding an LED to a multimeter's LCD screen affect readings?
I purchased a TekPower TP4000ZC multimeter, which has no backlight for the LCD.
I wish to add one myself, perhaps a single led at low current, driven directly off of the two AA batteries. I'll add a small toggle switch as well for saving the battery.... |
H: Instrumentation amplifier: resistor to ground for input bias current?
I've inherited an RF amplifier design (50MHz-1GHz) that uses an instrumentation amplifier to accept a DC voltage control signal. Neither myself nor my PI can explain why R8 and R18 are present. My guesses follow.
R8: Reading the spec sheet of re... |
H: transistor voltage always on
I've purchased this kit:
https://www.adafruit.com/product/1687
I've been using this as a reference:
http://www.ti.com/lit/ds/symlink/sn754410.pdf
I'm trying to power a DC motor from the kit and am having some issues.
I've connected ~5v input to vcc2 and 5v to vcc1 (as instructed - vcc1 ... |
H: DSO Screen Refresh - Start position
I just picked up my first DSO Oscilloscope, A Siglent SDS1052DL. I have never used an Oscilloscope, so I am trying to learn the basics. I have the following square wave, which drifts during the screen refresh. I know there is a way to set the start position but I can't find it in... |
H: Can I feed lower than rated voltage?
I'm poking around on eBay for some capacitors to use in circuits which I'm working on and see that they have a rated voltage.
After some quick research, I found that going over the rated voltage of a component can cause harm and/or destroy it.
Does the same happen if I go under ... |
H: cannot fix: warning signal clk IBUF has no load please help!
I have been trying to design a simple Hardware design to controll another board that powers a set of LEDs for a stage drum lighting system. I cannot for the life of me figure out why I am recieving these warnings
In short what I am trying to do here is c... |
H: Antenna efficiency and PCB impact
I'm trying to improve the range on my 433 MHz radios and came across http://www.att.com/edo/en_US/pdf/AntennaFundamentals.pdf. (Geez, there's so much RF information in many bits and pieces, if only there were a more complete source somewhere)
Section 3.2 talks about antenna efficie... |
H: How a zener and a schottky diodes protect laser diode?
I purchased a strain relief wire SR9C which has a small protection circuit for a laser diode. It says to contain a zener and a schottky diodes which protect the laser diode from ESD. By looking at the PCB board, I drew the following circuit (hopefully correct):... |
H: Where to find the data sheet for Huawei Honor 6 smartphone?
The smartphone seems to have bq24190 chip for power and charging control (according to /sys/), for which the data sheet specifies that it can be powered not only from USB's 5V, but also from up to 18V.
Does it mean I can charge my Huawer Honor 6 directly f... |
H: What is the best suggested way to amplify the voltage and ampere of a signal coming out of a microcontroller and keep wave form as it is?
I am generating semi-pure sine wave voltage signal out of an AVR microcontroller. The thing is I want to amplify this signal (power amplification [voltage and current]) with keep... |
H: Simplest possible 5V to +/- 10-15V converter (for op-amps)
Im looking for simplest possible solution to power op-amps from USB or phone charger.
Requirements:
+5V input voltage
±10V to ±15V output voltage
at least 10mA output current on both rails (+/-)
very low cost
low part count
simple and accessible parts (no ... |
H: Output capabilities of super capacitor
I have come across a question that is very near and dear to my heart and I am in the hopes that somebody can answer this new years eve question of mine per se.
So I am wondering, if I were to run two 2.7V 360F super capacitors in parallel and attach them to a 5V step-up regul... |
H: Using BJT transistor as switch using arduino digital pin
I was working on a project and decided to use a BJT transistor as a switch. I haven't taken the electronic circuit courses which deal with transistors in my university yet so I wanted some advice if my idea is feasible or not.
Basically, I have an actual swit... |
H: What are the rules for combining transistors to form digital circuits?
I just read Harris/Harris - Digital Design and Computer Architecture and in it they described how AND/OR/etc gates are made out of transistors. I read the book for fun (I'm not an EE person, my experience with circuit analysis is minimal) so whi... |
H: Burned out filament but the light bulb has small resistance
The light bulb shown below is from a Christmas tree light string. The string is made up of series connected light bulbs. However if one burns out, the other bulbs keep working. Taking out the bulb from its socket makes all the others in series with it to s... |
H: The right vocabulary for everything related to booting a µC and loading a program
The more I learn about all the steps required for bringing a µC to the phase of finally executing the program, the more I get the impression that there is no "golden path". It seems to me that the exact steps required are different fr... |
H: Serial Link Between 3.3V devices
I have an RPi and a freescale FRDM-KL25z controller which will talk over serial protocol. I'm using the pyserial library on the pi:
import serial
ser = serial.Serial('/dev/ttyAMA0', 9600)
ser.write('hi FRDM')
and using the serial protocol from the mbed library will generate interru... |
H: What's this symbol (capacitor with wire through the middle)?
I've occasionally come across this symbol which appears to be a capacitor with a wire through the middle - but I've never seen it on anything where I could get a look at what component it corresponds with physically, and I've never seen it defined in a li... |
H: ADC sampling problem using FPGA
I am trying to sample sinusoid signals using AD7928, which is a 1 MSPS ADC. It is connected to an Altera Cyclone V FPGA, and runs at 20 MHz master clock. Data rate is 1.25 MHz and that's due to the fact that the ADC outputs a new sample every 16 cycles. Using SignalTap Logic Analyser... |
H: This is an inductor symbol, right?
This is from the PCB in a microwave oven. On the right side, there are two symbols with the labels DU and OMIF. They look like inductors. Is that correct?
sidenote: this is found underneath a relay, the DU1PU. I have removed the relay. I'm guessing the components are connected to ... |
H: Analyzing an op amp circuit (transfer function) that does not match the basic cases
At the following circuit I want to find what it does and basically its transfer function. I've searched a lot but I didn't find any circuit like this. Since it does not match any of the basic types of op amp circuits (inverting or n... |
H: NPN Darlington circuit for 12V Diesel Glowplug
I'm trying to build a very simple circuit to drive a glowplug. I am using a TIP122 NPN.
simulate this circuit – Schematic created using CircuitLab
I wanted 0.017A going through the 12V plug. I estimated no more than 0.204W. I also assumed my NPN's HFE was 1000.
To fin... |
H: scheduler and stack
i develop my own scheduler on stm32f407 board
i have different queues of tasks with different priorities and frequencies
i want to mange stack operations myself when in SysTick_Handler event each 10ms
where to start from in push and pop operations
should i define own stack or what?
any good art... |
H: Building a prototype rig with naked boards and wires (running 24V, 3.6 A): how to be safe?
I am building a prototype rig. It includes:
1) A "naked" 24/48 V motion control evaluation board.
2) A I=3.6 A stepper motor.
3) A power supply.
I wired up the motor to the board with four wires (A-, A+, B-, B+). I wired the ... |
H: Transistor Emitting Without Collector
I'm pretty new to the hardware side of electronics and am building some basic logic gates. The first Im trying is an AND gate and the problem I'm having is that whenever I power the base of the transistor it's emitting power even with no power going through the collector. Any i... |
H: Repair (fixing back) lifted power thru hole pad + trace
Attached pictures are a lifted power pad + trace of a 1000 W PSU of a commercial subwoofer. Caliper showed 0.42 mm thick, which if correct gives about 12 oz copper trace!
In this particular pad was the source of a MOSFET after a rectifier bridge, transform... |
H: effective voltage of a sine wave
I am looking for effective voltage values for calculating power in a AC sine wave supplied circuit with a resistor under 2 conditions : full wave rectification; half wave rectification.
I have searched the internet for the effective value of a half wave rectified voltage and have fo... |
H: xilinx create schematic of top modul with lower level moduls
I have a top modul VHDL source file, which has a few instances of lower-level modules (VHDL) and signals which connects these lower-level modules. How can I generate a schematic for this? I mean, I would like to see the top module, inside it, the lower-le... |
H: Basic 12v LC Filter for Video noise reduction
I'm very new to electronics and I want to build a basic LC Filter with a 12v regulator and below is my basic schematic. Now i'm sure its incorrect but I want to know why and what i'm missing so I can learn.
I'm planning on using the following components:
C1: http://uk... |
H: Eneloop rechargable batteries for mouse?
I have a Apple Mighty Mouse, and I want to use rechargeable batteries, but I read somewhere on such a device I should only use Eneloop rechargeable batteries as they hold a charge when the device is not in use.
Is this a correct statement? I don't understand how one battery ... |
H: OR to XOR algebraically
If we have an OR function with two terms, like $$a \vee b$$ it can be written with only XOR like $$a \oplus b \oplus ab$$
RULE: $$a \vee b = a \oplus b \oplus ab$$
But what if we have three terms, like $$a \vee b \vee c$$ How can that be written with only XOR?
What is the equivalent of the R... |
H: Boost converter Inductor Current
In a boost converter during switch on time inductor build magnetic field and during off state magnetic field collapse.My question is during off satte inductor is connected to source voltage,so why not it building magnetic field
?
AI: It depends on the output voltage.
At the start, ... |
H: Why is the Gray code called a cyclic code?
I understand why it is called reflexive and a unit distance code. I don't see any cyclic pattern which is repeating in the code. Why is it called a cyclic code?
AI: cyclic
ˈsʌɪklɪk,ˈsɪklɪk/
adjective
1. occurring in cycles; regularly repeated.
You haven't given a reference... |
H: How can I calculate the Cimon in a DC-DC converter?
I would like to use LT3649 IC, but I don't know how can I calculate the following in the datasheet: Output current monitoring and regulation section in page 10. The datasheet: LT3649
If I use 10k resistor for Rimon and 10nF capacitor for Cimon how can I calculate ... |
H: Non-Inverting Op-Amp noise on the output when touched
I am using a non-inverting op-amp circuit (shown below) to linearize the output of multiple analogue force sensors. This is the circuit recommended by the manufacturer in their electrical integration document.The circuit is working and I am able Toggle between s... |
H: digital circuits math
I want to study digital circuits with the book "digital design" by M Morris Mano.
and I have no math knowledge.(I know only + - * /)
Do I have to study math first? if so, how much?
Generally(not specific to that "digital design" book) in which year, does the subject need math? First or second ... |
H: Clipping Class-AB Output
This assignment we have been given has been causing me major headaches. I feel like I'm finally close to getting this amp to work after hours of fiddling around, but now I've found the output is clipping at a very low voltage. It must have a differential input and a class AB output. Minimum... |
H: What happens to an op-amp with inputs and outputs connected to +V?
EE newbie here.
I am trying to put an additional op-amp circuit onto a crowded half-sized "perma-proto" breadboard; I have no room remaining on the centerline to mount a DIP package.
What I do have is a dual op-amp in 8-pin DIP; I only need one of... |
H: What are the critical characteristics of an op-amp for buffering reference voltages?
So, let's say I have a precision voltage reference with the output fed to a voltage divider which is tapped at two places for voltages A and B. I've made sure to use precision resistors (or calibrate) and the divider doesn't overlo... |
H: How to determine the input resistance of a bootstrapped emitter follower
I've used bootstrapping several times, either to boost the input impedance of an amplifier or to increase its gain. However most of the times I can see the beneficial effects of bootstrapping without actually knowing what's the actual input im... |
H: What VZ means in schematic?
Couldn't find the answer on the internet. The leads of VZ1 component are directly connected to mains.
AI: The leads of VZ1 component are directly connected to mains.
Therefore in this context, the component which makes most sense is the varistor (often a Metal Oxide Varistor or MOV). [A... |
H: 3 AA batteries vs. USB battery pack?
we have a few LED string lights that use 3 AA batteries and eat through batteries about once a week. I would like to replace the AA batteries with a USB battery pack I have which has about 8,000 MAH. Since AA batteries are 1.5v and standard USB is 5v, is this as simple as cuttin... |
H: Use multimeter to find approximate impedance of miswired speaker array?
I visit my father's house a few times each year. When he built the place, he had it wired for sound using in-wall systems, but (it seems) not by professionals. He blew out a receiver/amp, so I asked him to examine the wiring and he says it ha... |
H: Split 5V 3A into 1A in 2A to make USB charging device
Overall goal: make a couple USB phone & tablet charging ports from a 12V deep cycle battery.
Steps taken so far: I've read that using a resistor based system to step down from 12V to 5V leads to a lot of heat inefficiency so I purchased a SMAKN 12V to 5V 3A vol... |
H: UART in AVR Microcontrollers
If an UART is receiving data continuously, can I also send data using the same UART while receiving data at the same time?
AI: Simply, you can.
In addition to charansai's answer, if the MCU supports hardware UART then it becomes easier. Since the transmit/receive process is done via th... |
H: Biasing MOSFET with Constant Current Source
In the course of researching tube amplifier designs, it seems like a common technique to bias a MOSFET in an output stage using an LM317 configured as a constant current source, such as is given in the schematic on this page. How does this method of biasing work? Why is t... |
H: encrypted flash of DSP
when programming the flash of DSP by accident i encrypt the flash content.
is there any way to decrypt flash of a DSP? the flash was encrypted.
AI: If you were programming the device then you must have source non-encrypted code. Why not re-flash again with non-encrypted code?
However if it is... |
H: Signal in and out of flip according to IEEE symbols
I have the following IEEE symbol for a SR flip-flop
I have to work out the waveforms W and X given A and B. Here are A, B and the associated solution for W and X (as given by the book):
From my understanding of IEEE symbols the following rules apply:
If S1 is a... |
H: Multiple CAN bus devices broadcasting at the same time...possible conflict?
I've worked with CAN bus recently and started to wonder what would happen if multiple devices on a network suddenly happen to broadcast at the same time.
I mean every device on the CAN-bus network receives each other's messages. But since ... |
H: Coil winding sense in dual voltage power supply
Hello is the sense of the B winding in the transformer (same as A or opposite than A) can have any effect on the powered circuit?
Maybe due to the fact that the AC ripple of the negative rail is out in phase with the ripple in the positive rail and then worse?
AI: S... |
H: STM32F103: Can a timer can interfere with uart?
I have a simple program, which receives data from UART interface and drives a WS2812b led strip. So, I'm using USART3 to receive data (in IRQ mode) and T3C2 (timer 3, channel 2) to drive LEDs. Here is the code:
https://hastebin.com/rucumovero.cpp
If I use the uart i... |
H: Is 18650 battery capacity from 3V or 0V?
To calculate the battery capacity in mAh of an 18650 battery I understand you can use something like an iMax B6 in discharge mode on a fully charged (4.2V) battery to get the mAh it provides. The iMax B6 stops at 3V.
So my understanding of this is that the reading shown is t... |
H: Highly integrated RF front-end chipset RFX8055 issues
In this datasheet of RFX8055 (CMOS 5GHz WLAN 802.11a/n/ac RFeIC WITH PA, LNA, AND SPDT switch), they mention "5GHz Power Amplifier with Low-Pass Harmonic Filter".
If this filter is meant for filtering intermodulation products then it should better be bandpass ... |
H: "Old FM" vs. Modern FM radio signal. What's the difference and can I adapt?
I have a vintage radio that I managed to get all circuits and tubes back into original spec. The AM stations tune in fine but I get nothing on FM. I am told this is because it's tuning in "Old FM" - which I can only assume was part of the A... |
H: Charging a 5 cell 18v lithium battery with single charger?
I want to charge a 18v cordless drill lithium battery, which is basically 5 Panasonic INR18650-20R 3.7v cells connected in series.
the battery pins are BATTERY+, BATTERY- and 4 pins marked BATTERY1, BATTERY2, BATTERY3 and BATTERY4 which are connected betw... |
H: What is the meaning of "ground" and "-V" in a simple push-pull circuit?
In this simple "push-pull" circuit, there are +V, -V and ground connections.
up until now, i always considered ground to be the minus side of the battery.
but that is also the way i understand -V, so i don't see how current would flow through t... |
H: Rotate stepper motor in low RPM and minimum vibration
I want to control a stepper motor about 3RPM and at very low vibration.
I have a ROLLON SRL-M542H stepper controller.If I change it to high step per revolution it works smoothly without more vibration.
Is it a suitable method for reduce vibration?
And how to cal... |
H: Transistors are hard to wrap my head around with laws
When I was younger I played with micro controllers and moved on over to programming. I decided to play around with circuits again, and a few things are not clicking.
Specifically, I am not quite sure how exactly transistors effect circuits in regards to voltage ... |
H: Why do devices stop operating properly in extreme cold?
I have noticed that a lot of smart phones say that they won't operate under -4 degrees F (-20 degrees C). Can anyone explain to me what happens when the phones get cold that stops them from operating?
AI: -4 F is -20C, which is a standard low limit for chips a... |
H: Installed 555 timer socket backwards - can I reverse the chip in the socket?
I installed the socket for a NE555 timer ic backwards on a PCB. Can I just reverse the chip in the socket to cure the mistake?
AI: So long as the IC pins connect to the right PCB tracks, the orientation of the IC socket is irrelevant.
Loo... |
H: Powering Multiple loads from a single 12v battery
I have built a 12v rover - designed to be fully autonomous with a 12v deep cell marine battery as its only power source.
It uses the following components:
1. [Raspberry Pi3 through a power converter][1]
2. [Sainsmart 16 Channel Relay Board connected to the PI to con... |
H: LED strip calculate power
I bought a few LED strips.
I have a power supply with 12V and 15W, the strip is blinking. So I assume - not enough power!?
I have 5m strip, what power supply do I need for this? And for 10 or 15m?
AI: I work a bit with LED strips and here's how I conceptualize them.
The "stock, basic" ... |
H: How to power a white LED from batteries
I would like to power a white LED from batteries.
The LED I'd like to use has a forward voltage of 3.3V, the datasheet specifies the voltage range from minimum 2.8V to maximum 3.8V.
My idea is to use 1.5V AA or AAA batteries to power the LED, I don't want to use Lithium batte... |
H: Ruggedizing a home-made High-Current SSPC
After establishing that we're not going to use our load bank in PWM mode (see here), I'm now trying to draft up a circuit that would be controlled by an µC (Arduino or else) and a multiplexer (this).
I'm also trying to protect the input from reverse voltage and overvoltage ... |
H: Input voltage range for Wemos D1 board
What's the input voltage range for a Wemos D1 board?
I have a battery pack of 4 AA batteries. This makes 41.5 V = 6 V, but I think they can drop as low as 41.2 V = 4.8 V. Can I hook the battery pack directly to the input voltage socket? Or is this to much?
What happens when I ... |
H: Voltage Drop Calculation (AC)
Hope someone can help me out and point me the right direction to solving this.
I am trying to do a voltage drop calculation to see the VD % for the cable selected. The following are the values,
Current: 140A (I)
Resistance of Cable: 0.0001 Ohm/m (R)
Reactance of Cable: 0.0000704 Ohm/m ... |
H: MAX6966 a suitable sink driver for nixie tubes?
I recieved some IN-14 nixie tubes for Christmas, and was hoping to implement them in a project i have been considering for some time. The details are unimportant, except that each nixie tube should have its own discrete pcb and driver.
After looking at ICs for some ti... |
H: Offsetting a differential amplifier to remove the need for a dual supply
I'm developing two similar circuits that will enable me to differentiate the X and Y coordinates from a segmented photo-diode (Four segments). These coordinates will be dependent upon the position of a laser spot falling onto the surface of th... |
H: Second order active low pass filter values
I want to use a second order active low pass filter to cut off frequencies over 33kHz . The input is 1.3 Volts peak to peak sine wave of 32 Khz and I want to make it 30kHz of 1Vpp . The formulas for calculating the values on the components of S.O.A.L.P. are for different S... |
H: Atmega328 without bootloader
Atmega328 is available in market in two versions - With and without bootloader. All prefer the one with bootloader. What will be the advantages/disadvantages of Atmega328 without bootloader ? I read that bootloader should be present in a controller for ease of programming. But I am not ... |
H: Purpose of black overlay in flex circuit design
Does anyone know the purpose of the black overlay I see applied to flexible circuits inside phones? This is inside the S7, I see the same thing in the iphone. It's clearly been applied on top of the coverlay. So what purpose does it serve. Could be EMI maybe? May... |
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