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H: How to make 9V battery clip easier to work with breadboard
I just recently started to play around with electrics. I use a breadboard as a playground and I have to plug in and out my 9V battery so many times that the clip is now broken. The tip of the lead came off (see picture) and stuck inside the breadboard.
I ... |
H: Keeping a consistent supply voltage while driving a solenoid from battery
I am working on a project where I would like to pulse a solenoid using an arduino with the power from both coming from 4xAA batteries.
The project is a puzzle, when you solve the puzzle, the solenoid momentarily engages to open a latch.
The ... |
H: part identification
If possible. I would like a datasheet for the large IC pictured here, I havent found anything on google yet, seaching:MXICZ101061
AI: The important part is the second line. That's a Macronix International Co. MX25L512 512kb serial flash.
A standard SPI eeprom. 25L almost always suggests SPI eepr... |
H: Does the positive pole of an an electrolytic capacitor act as a cathode when discharging?
As far as I know, the anode of a polarized device is defined as the location where the oxidation occurs. For a galvanic cell, this means that it corresponds to the negative pole, while for an electrolytic cell it should refer ... |
H: Can I use two Power Source to Switch with a Relay like this?
I'm Planning to switch between two power sources with a Arduino like below diagram.
what I'm going to do is monitor AC power failure with a sensor and then once AC power failed switch the Relay to Battery source.
My question is, Connecting two ground wir... |
H: How to determine the norton- and thevenin equivalent circuit of this circuit?
I was wondering how to determine the Norton- and thevenin equivalent circuit for this circuit using superposition. \$R_1=R_2=R_5=100 \Omega, \ \ R4=470 \Omega \ \ R3=330 \Omega\$ \$V_1=10V, V_2=100V\$.
I have managed to derive \$R_T=62 \O... |
H: multiple diode problem computer simulation and hand answer don't match
I am trying to solve this circuit-
Here is what I have done till now-
Assumed every diode is forward biased.
Used mesh analysis to find that in left mesh the current is -1.63 mA, that means my initial assumption was wrong about D3 diode. And i... |
H: Random fills in PCB in Eagle
I have this red hatched line around a button and Eagle shows an error for this. What is this error?
AI: A dimension error means something is too close to something else. In this case it looks like your silkscreen is too close to your hole (shown by the rectangular outline). You can eith... |
H: Identifying natural an forced response circuits
yesterday my professor introduced us to forced response circuits. I am some what confused on telling the difference when trying to find D.E. for it.
Determine the D.E. governing V(t), t>0.
This is one of the pratice problems he gave us. Now since t>0 the switch is on... |
H: What are "islands" on circuit diagrams?
On many schematics I saw areas, which are apparently not connected to other parts of the scheme.
For example, below is a part of Arduino Uno diagram:
As you see, below are two "islands" which are not connected to other parts.
What are they mean?
AI: Usually, circuit diagrams... |
H: RMS value of clipped sine
I'm confused about the Vrms value of a clipped rectified sine:
The reason it's clipped and distorted, is because it's the output from a tiny transformer (0.7W), and the filter bank charges at the peaks of the waveform, pulling down the voltage.
Anyway, it measures as 3.88V peak, yet only ... |
H: Diodes in LDO schematic
Could someone please explain why are there two Schottky diodes in this schematic?
And also why is the VOUT connected through one of them to VIN.
AI: The two diodes serve different purposes. The first one prevents C1 from draining if power is temporarily removed from JP1. The second one preve... |
H: What's with TO-252 package middle lead?
This is the TO-252 package.
It's got a tab, and two leads. There is, however, a "stub" of a lead, usually connected to the tab. What function does this serve? Is it a vestigial pin that mutated and was kept by selection bias?
I am aware of a few other questions concerning t... |
H: Optic encoder - Rotation
In the following you can see the channel A ( above ) and the Channel B ( middle) output of an optic encoder that is connected on a rotating shaft.
My questions is: Does the impulse width impact the way you need to count the distance? To me , it seem that channel A is in advance from channe... |
H: does NPN transistor allow current to flow when applying +ve to base from diff battery?
Please forgive me if this is a stupid question, I am not an electronics student but a software developer trying to understand a transistor behaviour.
I just learned about transistor a few minutes ago from a youtube video.
My ques... |
H: White LED W/ 3V or less?
I'm designing a front end bike light just for the fun of it, and I've hit a problem. So far my design will have an input voltage of 3V, but all the white LEDs I find have a forward voltage of 3.2V or greater. I am curious if there are any white LEDs that I can run off of 3V.
My goal of this... |
H: Is there really current in AC current?
Perhaps a simple question, but from the Wikipedia page, electric current is defined as"...a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire." (https://en.wikipedia.org/wiki/Electric_current)
So my question is then, how i... |
H: Unstucked electrical components motherboard
Please tell me the name of the electrical components?
This Kindle Fire 1st gen.
AI: My guess would be a USB ESD protection diode. I found a Semtech RClamp1521P which has a ZZ marking and is really small. |
H: Working with inductive loads
I have a 2 ton split AC that would draw about 12A current and is rated for 2260W input power at 230V. With this much information how do I choose a solid state relay? Since the rating is inductive what do I look for?
AI: Nothing special is needed. You can buy a SSR without zero-cross det... |
H: How to calibrate HR202 humidity sensor?
I'm doing a project on humidity monitoring using HR202 Humidity sensor and PIC16F877A.I could not find resolution & accuracy of HR202 in online.So please help me to calibrate and use HR202 humidity sensor(not module).
AI: As WhatRoughBeast already mentioned the data sheet is ... |
H: How to control a flag in two different procedural blocks in verilog?
I want to rise a flag once I enter procedural block#1, and I want to reset it to zero in another procedural block. Of course I get an error saying the flag is driven by too many drivers. How can I overcome this problem?
Block 1, sensitive to sw (F... |
H: Why do ICs have NC (No Connection or No Function) pins?
In case they have no use to the end users and have no function, why are they given as pins instead of being just closed? Some ICs have even 4-5 NC continuously (in accordance to their pin number).
AI: There can be several reasons.
It is easier/cheaper to use ... |
H: Read and Identify Memory Diagram
I am so confused, and the book's explanation confuses me more, can anyone explain how to get and identify the following questions displayed? the Book talks about a 2^2 * 3 bit memory but I cant seem to grasp it, I've search the internet but I cant seem to find the correct phrase th... |
H: Help Me to Identify what is the Cause for Heating with this Circuit
I built below voltage Regulator Circuit and noticed that after sometime 1K resistor is getting a lot of heat and also I connected the multi meter to Output of this circuit and adjusted preset to output 12V. after sometime voltage seems to be drop b... |
H: Is amperage constant or relative to the device?
I have a pull chain ceiling light, very small.
The pull chain mechanism broke. Instead of buying a new mechanism I decided to try and do some Arduino experiments. Prior to that though I need the light to work because it's actually the light by which I solder and work... |
H: How to calculate the current in a PWM LED driver circuit?
I've been fascinated by the simplicity of the driver circuit based in the YX8018 in the prominent solar garden lights, they were able to simplify the circuit a lot in a simple boost topology by just running at fixed frequency and using the LED as the output ... |
H: Rotary Switches - 4 Positions, Two Outputs - How to determine the selected "mode"?
My apologies for not such a great description.. so I will clarify here.
I have a rotary switch from an old aircraft panel that has 4 positions and two outputs.
Using my voltmeter's resistance mode I can see the following on the outpu... |
H: Unused Ethernet pins
I want to use the LAN9500AI controller in an application. This is a USB <-> Ethernet bridge with access to the MII interface. Since I just need the USB and MII interface, the ethernet interface (RXP, RXN, TXP, TXN) will be unconnected. But what's the "default" state of these pins if they are un... |
H: Why are load resistor values in common-emitter amplifiers so large?
So I have seen a few circuits for common-emitter amplifiers, like this one here.
I get the function of most of the components and thir placements, but my question is, why is the load resistor at 1.2kohms? For example, I have a speaker that home tha... |
H: How to supply one or more servo motors from a PC power supply?
I have a PC power suply 800w. The 12V output has max 20A. How can I convert the 12V to 6V and 10A (when 5 servos will work in the same time)?
AI: 1- I propose to use 5V output which can supply more current with no problems.
2- If not you have to use a D... |
H: Why are reversed geometry (0306, 0204) capacitors not used more often?
It seems that reversed geometry or low inductance ceramic chip capacitors (MLCCs) are simply better in every spec than regular geometry, and may allow using just one value to bypass instead of two (eg a reversed 1uF instead of a 1uF and 0.1uF). ... |
H: Logic Synthesis Synthesis - Consensus property?
OK, I'm working on a synthesis problem that doesn't quite make sense. I start with the equation \$f = x_1x_2'x_3' + x_1x_2x_4 + x_1x_2'x_3x_4'\$ and have to reduce it but I keep going in loops. I tried the solution from the solution from the Solutions Manual but one l... |
H: Types of decibels
Why we use dBA or any other type of decibel unit instead of basic decibels unit (dB)? Why we have so many types of this unit?
AI: Decibels are a nice way to measure things which come in a very wide dynamic range as it is a logarithmic measurement.
At a certain amount of zeros it just gets hard to ... |
H: How do diodes work in an AM band application?
I have been trying to build an AM radio for a while now and with continued failure, I am trying different avenues.
I understand that Germanium diodes have a forward drop of about 0.3V; to be sure, I put the diode in series with a resistor to measure the diodes forward ... |
H: Product-of-Sums Synthesis
Alright, have another one which the solutions manual is vague on.
I have to reduce \$f =(x1+x3+x4)(x1+x2'+x3)(x1+x2'+x3'+x4)\$. Right in the first step, though, the solution does something I don't understand.
They go to \$(x1+x3+x4)(x1+x2'+x3)(x1+x2'+x3+x4)(x1+x2'+x3'+x4)\$. Where did that... |
H: Converting voltage reading from temperature sensor into Celcius
I'm learning how to read temperature reading from a sensor from this tutorial.
The code (Arduino) to convert from voltage reading into temperature is as follow.
float temperatureC = (voltage - 0.5) * 100 ; // Converting to degrees
I wonder why the fo... |
H: What is an architecture?
I've read many times the terms:
cpu architecture
hardware architecture
software architecture
computer architecture
And so I thought an architecture describes the structure (layout,interface, position,functionality,...) of something.
Am I right, or do I have to distinguish in those cases!?... |
H: Why are "flicker flame bulbs" always bulbs or how do flicker flame bulbs work?
In other words, I've never seen the type of filament (if filament is the correct term—if not, what is the correct term?) outside of a bulb—as seen in the video linked to below. Is there something about the way it works that makes them u... |
H: Can someone please explain how to hook up this transformer?
I found an old transformer that I purchased about 10 years ago to build a regulated dual rail power supply, but never went through with the project. I still would like to do the project but it has been so long now that I lost any documentation I might ha... |
H: Trying to calculate UTP and LTP of opamp circuit
I'm doing a practise test and one of the questions is asking me to find the upper trip point (UTP) and lower trip point (LTP) of the following circuit:
I'm not sure how to do it with a circuit of this configuration.
Could anybody tell me how I should go about it?
AI... |
H: How do wearables track exercises without taking input from user?
Recently there have been wearable devices that can track your exercises and reps (eg bench press, push ups, pull ups) without the user telling them. What technology do they use to track these exercises?
AI: The link you gave clearly indicates the sens... |
H: Correct term for ADC process
Is it correct to say that ADC is done in two steps: 1-Sample and Hold 2- Quantization
or it should be done in two steps: 1-Sample and Hold 2- Encoding ?
AI: You definitely need sample+hold and quantization in there. Encoding is going to be a bit dependent on what type of ADC you have. ... |
H: How does a HT motor deliver profit
How is HT motor more beneficial over a motor of same power delivery.
If the power delivered remains same in both types of motor for a given power delivered to shaft, how is one more useful than the other.?
AI: I'll assume that this is an Indian student homework question and by HT ... |
H: Lithium polymer battery charger with LDO and AVR
I am planning to use this in my project.
The AVR microcontroller is asleep most of the time (less than 500 µA), and the current draw raises every minute up to 100 mA, but it lasts 500 ms maximum. So I think connecting the charger directly is not a problem.
In the ori... |
H: Why is Vt usually 26 mV in the diode formula?
For the diode formula:
$$I_D = I_S(e^{V_D/V_T} - 1)$$
(Where \$I_D\$ is the current of the diode)
Why is \$V_T\$ approximately always 26 mV in a lot of problems?
I can't find the part of the book that says this. It says \$V_T = {kT \over q}\$ but how is that always 26 m... |
H: What is the purpose of this asymmetric IC footprint?
The IC is the PE42542, a SP4T RF Switch, 9 kHz–18 GHz. It comes in a LGA package with 4 separate ground pads, different pin dimensions, different number of pins on each side, and different pin pitches.
Why is this footprint so asymmetric in pitch and pad dimens... |
H: invert mosfet gate
Is there any way to invert the gate voltage of a mosfet. Weird question, but english is not my native language. I mean: Can I turn OFF a mosfet by applying a voltage at the gate?
AI: You can use a p-channel enhancement MOSFET. If the gate voltage is the same as the voltage at the source (typicall... |
H: What can be done with USB OTG ports in microcontroller.?
I have PIC32 MCU. It supports USB OTG functionality. I searched a lot on google about the applications regarding OTG but didn't find many results. I was wondering if any one can explain what can be done with OTG in MCU. Can we store some data via OTG in flash... |
H: NPN transistor negative base voltage
In this circuit, when I switch off the transistor opening the switch SW1, a negative Voltage of circa -6.5V appears at its base.
I would like to understand why, my first hypotesis is because of the base capacitance of the BJT. Is it true?
simulate this circuit – Schematic creat... |
H: What happens to a diode when it break-downs?
What happens when you expose a diode beyond the break-down voltage, does it become conductive in both senses or non-conductive in both senses?
AI: At reverse breakdown voltage on a PN junction diode, you get a large increase in reverse current (normally close to zero) fo... |
H: How do I size the coupling capacitance for a SEPIC converter?
The app notes I've seen for a SEPIC converter1 all tell me to size the coupling capacitor for ripple currents and voltages. I haven't seen one that tells me how to size the capacitance. Obviously there's some minimum; zero capacitance means no coupling, ... |
H: Membrane for sht10 (humidity & temperature) sensor
I made a uC powered device to control the humidity and temperature of a room. I used sht10 sensor. The room humidity provided with a humidifier. The sensor was working well. When trying to test the device at the target room, I think the mist at the room made the se... |
H: How are some modules priced ridiculously low?
I am planning on carrying out a design using the CP2102 Interface IC. The cheapest price I can source (for bulk purchase of 1500 parts) is from Digikey at 2.34$/piece. A price of 2.34$ is approximately 151 Indian rupees.
However, CP2102 modules (with usb connectors etc... |
H: Timed on/off switch problem
I'm doing a small project for my school and the main point of my problem is that I need a simple circuit, that could activate for a fixed time when the mains power goes on.
For example:
I have a TV, and when it is plugged in an on/off switch should be pressed and held down for 5 seconds ... |
H: Buck-Boost converter - Boost mode not working
I am using TPS63001 Buck-Boost regulator for creating 3.3V in my circuit. The converter works in Buck mode as excepted. So when I give 5V on the input, it is OK. When I reduce the input voltage from 5V to 2.7V, it still works perfectly in this case in Boost mode. But wh... |
H: How can AC current power anything?
I understand the difference between AC and DC. What I don't understand is how does AC power anything when it's reusing the same electrons over and over as they are moving back and forth?
A visual picture is this link at 0:35.
Wouldn't it require new electrons? Eventually?
AI: @Th... |
H: In an n-channel JFET, why isn't the formation of depletion layer symmetrical?
When a reverse bias voltage is applied between the gate and the source, depletion layer is formed between the p-type and n-type materials in the JFET. My question is why isn't it symmetrical? Why does it move more towards the drain than t... |
H: Instrumentation Amplifier output mysteriously increases upon connecting across a resistor, compared to connecting the same voltage directly across it
I am designing a simple resistance measurement circuit. Resistance range is from \$10m\Omega\$ to \$10k\Omega\$ and desired accuracy is 0.1%.
The circuit provides con... |
H: Can anyone help me with designing a logic circuit from a truth table
Im having trouble with designing a circuit with logic gates that represents this truth table:
A B C X
0 0 0 0
0 0 1 1
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 1
1 1 0 1
1 1 1 0
We can use NOT gates, AND(2inputs), OR(2inputs).
Thanks!
AI: It's obviously a hom... |
H: What initial orientation do pick&place machines use when applying the "rotation angle"?
PCB assemblers require a file describing the component identifiers, the X and Y coordinates of the centre, and the rotation angle. I generate that file automatically from my CAD package (DesignSpark PCB). However the rotation an... |
H: NiMH or Li-ion trickle charge?
To start off, I am aware that neither battery type should be “trickle charged”.
That being said, I have a product that really needs to randomly “trickle” charge a rechargeable battery. I have a device that will have sporadic and unreliable solar energy as the only source. While the de... |
H: Designing af PCB with an ISP header and a LED
This is my first project, it should be very simple. I'm trying to add an ISP header and a LED to a PCB, but I'm having doubts if it'll work. The problem is the GND connections .. the yellow line (in EAGLE) runs through the LED and then to the ISP header, then to the Att... |
H: Low Melting Point solder paste reflow profile adviced
I've found a low temp solder paste with a melting point of 140°C. I want to use it with some SMD parts. I've looked for some reflow profiles and didn't found nothing with this low melting point.
Can I just go without "soaking zone" and:
- linear ramp profile to ... |
H: LM317 equivalent backfeeding
I have a simple circuit using an LM317-type voltage regulator (ZLDO1117GTA) as a constant-current source. The input is connected to a 15v source, and the output is charging a lead-acid battery.
In one mode, the output will be connected to the battery, but the 15v source will be disconne... |
H: Amplify signal with extremely low S/N-ratio
Is it possible electronically to amplify an expected signal with a S/N close to 1, or 1? If yes, how? I already tried to use an Lock-In-Amplifier, but that was not useful after the noise itself is also chopped. Are there other possibilities?
Clarification: I have a photo ... |
H: Synchronous rectification simulation
I am (for educational and research purposes) trying to replace diodes with MOSFETs in a rectifier of a conventional automotive alternator (12V).
Before I proceed with hardware implementation, I would like to learn as much as possible about rectification itself and also synchron... |
H: Quick junction / pn junction diode clarification
I was studying diodes. I was at the part where we talk about P-N junctions diodes. There is a part I am confused about. Is the "junction" part the part in the middle which blocks the current if no voltage is applied? Or is the "junction" part the entire diode, or eac... |
H: Inductor Q-factor for switch mode
I am designing a small switch mode power supply using the TPS63060DSCT, based on the data sheet I will require a 1.5uH inductor. I have be told that the Q-factor must be considered in the inductor (and capacitor) selection. Is it the case where the higher the Q-factor the better? a... |
H: Difference between disconnector, circuit breaker and load break switch?
There are various types of devices available for carrying out the switching and tasks.
I have a question about the differences between disconnectors, circuit breakers and load break switches especially at high voltages.
Are there any other type... |
H: How do I size the output capacitor for a DC bench power supply?
I'm designing a DC bench power supply and have come to the matter of choosing
the output capacitor. I've identified a number of related design criteria, but
I'm finding my reasoning still going a bit in circles as I try to sequence
these into a sensibl... |
H: Eagle clearance issue
I don't know how to search this problem on google so I was hoping you guys could help out.
I have made an eagle part by myself. I have used the top layer for the pads (just click pad and then adjust size) and I used 21 layer for the package width and stuff. Now I also get a clearance under and... |
H: How does a forward biased diode conduct electricity?
I am having a hard time imagining the flow of current through the p-n junction.
When a diode is forward biased, the holes on one side of the barrier and electrons from the other side try to cross the barrier. But as soon as they do, shouldn't the electrons fall i... |
H: Why is DC offset from LO feedthrough less problematic in the second mixer stage of a dual conversion receiver?
A dual conversion receiver has two frequency translation stages. The first mixer translates from RF to IF; the second (IF) mixer translates from IF to baseband.
This architecture is supposed to help avoid... |
H: Accuracy of a data acquisition hardware
In a data acquisition system absolute accuracy is defined as measure of all error sources as following:
Abs. accuracy = error from Gain(Span error) + error from Offset + (error from Noise + Quantization)
Here in the following data sheet at page 30:
http://www.mccdaq.com/pdfs/... |
H: Linear output voltage using a potentiometer
I would like to use a linear 10K potentiometer to have a variable voltage output between 0 and 5V using a 5V input. The idea is to have the output voltage increase in a linear way as I'm turning the knob.
If it's turned 0% I need 0V output.
If it's turned 100% open I ne... |
H: Glitch filter implementation
I am trying to implement the LTC4361 chip using opAMPS on a bread board. There is a statement which reads - "V trip threshold and
a 10µs glitch filter" (page 6 of datasheet).
How can I implement a glitch filter ?
If I understand right, a glitch filter is something that filters out smal... |
H: interfacing multiple ADC: sharing master clock
My project involves interfacing two analog-digital converters to an STM32F411RE microcontroller.
The first ADC is an ADS1191, the second is an ADS1158.
Those two ADCs will have to convert signals simultaneously and their samples retreived by the MCU.
I've been used to ... |
H: Is MOSFET gate threshold voltage a limit or minimal "Full-on" switching voltage?
I've been shopping for some mosfet transistors, for a starter kit, and noticed listings that state a mosfet is suitable for 5v logic, but the data sheets says Gate Threshold is 1-2v.
4v gated mosfets, which are closer to 5v, by the sa... |
H: Interfacing with a S6B0741
I am using a LPC4300 board to interface with a graphical LCD, a S6B0741. I have been trying to get it initialized, but I am not sure if I am sending the commands the correct way.
The code I have right now:
GPIO_ClearValue (LCD_PINS.GPIOPortNum, (1<<LCD_PINS.GPIOBits[10]));
GPIO_ClearV... |
H: 7404N and high output
Simple question: Is it OK for the output pins to be high? I want to use the 7401N together with a 74LS138 to do memory address decoding. I will connect two Yx pins to two two separate input pins on the 7404N. From here the two output pins from the 7404N will be connected to the same pin on my ... |
H: Bluetooth bothered from the next house ... plausible? Solutions?
I have two computer sitting in a room at one end of my house. I typically connect a bluetooth trackpad to each, and a bluetooth audio box to one.
Every so often, bluetooth communications are disrupted. The trackpads suffer from 'lost connection'; the ... |
H: How to trigger triac using DC?
This video features a circuit that triggers a triac using a DC:
https://www.youtube.com/watch?v=ZXXup79B6Gc
I would like to make a little modification on it it. The video says that I have to connect the "Neutral" of mains to "Negative" of the DC battery, this is a bad restriction for ... |
H: Why does this schottky diode have three pins
I'm just wondering why this schottky diode have three pins?
I know two of the pins acts like rectifier but what does the a third pin do?
Source:
http://www.digikey.com/product-detail/en/DB3J208K0L/DB3J208K0LTR-ND/2295704
AI: In general, single diodes in 3-lead SM packag... |
H: Inverting a very fast clock signal
How can I generate a inverted signal of a 20MHz Clock signal synchronous to the original signal? (At least, very close to the original)
With a typical HEX INVERTER the propagation delay is already too high (5-10ns).
Should I use a single-ended to differential IC? Couldn't find any... |
H: How does one use more than one device requiring the same input voltage on one/same power supply?
Lets say I want to power a high output LED powered by the appropriate/included driver as well as a heatsink fan; they both expect a 12V input voltage, but the LED driver expects 900mA meanwhile the fan expects 90mA. Th... |
H: Current feedback OPAMP analysis
Till now I studied voltage feedback opamps and I know how circuits involving them are solved. What is difference between current feedback and voltage feedback amplifier? What are steps in analysis of current feedback opamps?
AI: Current-Feedback Amplifiers (CFA) have a high-impedance... |
H: Controlling DC Motor with Raspberry Pi
I'm new to both StackExchange and electronics in general.
I want to be able to turn on and off a DC motor using my Raspberry Pi.
I have a breadboard, a 6V DC motor, an NPN Transistor (ST 2N2222), a battery holder that holds 4 AA batteries (and consequently has a P.D. of about ... |
H: Simple AVR LED blink in assembly - why does this code not work?
I've been trying to blink an LED with AVR assembly. I'm using an ATMega168 chip and avr-gcc toolchain. Here's my code:
.include "m168.h"
.global main
main:
ldi r16, 0b00000001
out DDRB,r16 ; Set PB0 to output
out PORTB,r16 ... |
H: C or C++ for EE
I am a freshman EE student looking to have an emphasis in computer engineering. I do not start my core engineering classes till next year. However, I am wanting to get a jump on learning a "close to the metal" programming language. Should I learn C or C++? Or any other language for that matter.
AI: ... |
H: How do I derate paralleled diodes with negative temperature coeffecients?
In my application, my load current is 1.4 amps, and for reasons of cost, availability, and recovery time, I want to use this particular 1 amp diode. Like many diodes, this one has a negative temperature coefficient; the hotter they get, the l... |
H: Tradeoffs and design considerations when choosing a crystal + PLL combo for MCU timing
I am in the process of doing more work on ARM platforms (specifically for this example the Atmel SAMD10 Cortex M0+ line). The clock flexibility and lack of ridiculous fuse settings feels like a (very much overdue) breath of fresh... |
H: Power supply for FPGA
I have a Spartan 6 FPGA (XC6SLX9-2TQG144) and I'm designing a power supply for it.
Let's assume that I will utilize all of its logic (very possible) and I want to clock it as fast as possible (around 350MHz).
How can I estimate the power (number of amps) that my PSU has to supply? Not precisel... |
H: What is the way to calculate the Voltage gain of cascade common-emitter BJT amplifier?
I have a problem of calculating the voltage gain of cascade common emitter BJT amplifier using small-signal model
Assume that the reactance of the capacitor is negligible. The circuit is bias at \$I_{C1}=0.1mA\$ and \$I_{C2}=1mA\... |
H: BJT Current limiter for linear power supply
I am trying to design a current limiter or my LM317 based power supply using this schema.
The power supply must be able to provide a maximum of 1.5A@30V.
I made some calculations and I would like to understand if I am on the right way.
Goal is to find suitable values for ... |
H: Glitchy Touchscreen Caused by Charger extra question
In this thread Glitchy Touchscreen Caused by Charger the answer states it is from the USB charger not being rated high enough. I am using the Moto G 1st gen and upon using a charger rated for 5v 800 mah I experience the same issues. The only thing is that the Mot... |
H: Use the RESET PIN on Attiny85 as Input with voltage divider
Voltage divider & pull-up with analogRead
The Attiny has 6 pins that you can use as I/O.
While 5 of them are really easy to use the Pin 1, the Reset PIN , obviously Resets the Microcontroller if the voltage is lower than around 2.5v.
By reprogramming the f... |
H: When a diode does not conduct what happens to the current?
simulate this circuit – Schematic created using CircuitLab
Since the voltage at node(A) is 30V, the diode(D1) does not conduct because the voltage at the anode is 20V. What about the current that has been divide due to the parallel branches? At point B is ... |
H: How to calculate R,L,C on a bandpass filter?
As part of a project I'm doing for the class Signal and Systems Analysis, I'm given the following:
With A=10, T=0.25ms and To=1ms.
I am then asked to:
After reading a lot, I think that I should use the RLC Bandpass filter, but I'm not 100% sure. Also, the main problem... |
H: How do I calculate how large my battery's voltage needs to be to power my robot?
I'm building a robot and need to select a battery. I will be powering 3 12 V motors, a 5 V infrared sensor, an Arduino (input voltage of 5 V), and a couple of other electronic devices ranging from 3.5 to 7 V. How do I calculate how muc... |
H: Finding Differential Equation in RC Circuit with op-amp
I am trying to find the D.E. that relates Vin to Vout.
KCL at A: $$\frac{A-V_o}{12} + \frac{A-V_i}{6} + \frac{1}{12}*\frac{dV}{dt} = 0\tag1$$
KCL at B: $$\frac{B-0}{10} + \frac{B-V_o}{10} = 0\tag2$$
\$2B=V_o\$ or \$B = .5V_o\$
By using op-amp rules V+=V-(A=B)... |
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