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H: Using a mixed technology, SMD and THT components in one PCB
I want change design from Through-hole technology to SMD design. Some components have no SMD version, for example some transistors in TO-92 package, and Power Mosfets, which available in DPAK SMD package, but since it requires a heat-sink, there is no much... |
H: How to use common mode choke inductors? (differential vs common mode)
I have yet to undestrand exactly how to use common mode chokes inductors, according to the datasheet they have 2 operation modes like in the picture common mode and differential mode, however im afraid i dont understand the datasheet itself
As ... |
H: transistor command short circuit
In the circuit below (schematic diagram), the command from a microcontroller allow to send the 5V to the output through two transistors command Q1 and Q2.
simulate this circuit – Schematic created using CircuitLab
My question is: what happen if the transistor Q1 is short circui... |
H: How to calculate rise time of linear regulator
Given a standard LDO with no soft start, that provides power to a bunch of decoupling capacitors, and a single chip. How do you calculate the rise time of the output rail ahead of time? Is it based on the time constant of the Rds of the internal FET into the decoupl... |
H: Anything bad to place a via on a pad?
Once I mistakenly placed a via on 0603 pad and didn't have any problem on soldering. I am routing another board now and I could save some space by placing some vias (0.3mm) on a 0603 pad. I wonder if it is a used technique or is it a bad practice? Would it cause PCB or PCBA pro... |
H: What's the purpose of the diode in this selectable supply voltage circuit part
I'm looking at the power supply part of the schematic of SparkFun's Pro Micro Arduino board, which has a jumper to enable or disable a voltage regulator to select between running the board at 3.3V or 5V:
I have two questions about D2:
... |
H: Detecting electrons as they tunnel through the band gap of a P-N junction
As a learning exercise I'd like to try creating a random number generator using reverse-biased BJTs. As I understand it, if the emitter is saturated in reverse bias, occasionally electrons will tunnel through the band gap to the base pin.
C... |
H: Atmega328 fast PWM (mode 7) of timer 0 not working as expected
I am blinking an LED on PORTB5 using timer 0 in mode 7. The time between blinks is computed as $$ \frac{(\text{OCROA}+1) \times \text{prescaler} \times \text{timerCount}}{\text{FCPU}} $$ \$FCPU=16MHz\$. With \$OCROA=124\$, \$prescaler=1024\$, and \$time... |
H: Thèvenin equivalent circuit
I calculated the Thèvenin equivalent circuit of a given circuit in two ways. I know that one is correct and the other is not (because I saw the result on my book), but I can't figure out why the other is wrong.
This is the starting circuit:
simulate this circuit – Schematic created usin... |
H: What is causing this level shift in my wave?
Excuse the quality, sorry;
RED is GATE of Q2.
YELLOW is GATE of Q4.
5V INPUT AT ALL STAGES
What are possible reasons that my H-bridge has a little 'bump' at the turn-off of the high-side?
It's reflected on the Vin(bridge) too;
Circuit:
(also here )
I've added a new sh... |
H: RL voltage across inductor differential equation
I have a simple RL circuit such as the one shown below
and I want to derive the differential equation relating the input and output voltages. I want to take the output voltage as the one across the inductor. So far I have done the following but I'm not sure whether ... |
H: Why both voltage and mAh are mentioned in batteries?
If battery is a voltage source then why current is mentioned ? The current depends on the resistance in the circuit right? Then how can a battery give mAh as well as voltage?
AI: mAh is a measure of battery capacity, not instantaneous current. A 1000mAh battery c... |
H: DC Op-Amp Output at an unexpected voltage?
For some reason Op-Amps are impossible for me. I'm experimenting with them a little bit. I have the following circuit...
simulate this circuit – Schematic created using CircuitLab
This is the circuit I have on my breadboard. I was just trying to see the "infinite gain" I ... |
H: How to use HX711 module with PIC microcontroller?
I'm trying to use the HX711 to capture the weight of a load cell using the PIC18F4520 microcontroller.
According to the datasheet (http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf) if I put the clock pin (PD_SCK) at GND, the module will activate its inter... |
H: LC tank circuit feeding on op-amp, no oscillation?
Based on what I learned during this experiment I've built the following circuit using an op-amp configured as a buffer...
simulate this circuit – Schematic created using CircuitLab
The inductance of the coil is unknown. I have found no way to measure the inductanc... |
H: Measuring the inductance of a coil?
I have a hand-wound coil I'm using in an LC Tank circuit. Using my multi-meter, I found out that the coil is drawing .6mA at 9v. Using Ohm's Law...
$$R = V/I$$
$$R = 9/.0006$$
$$R = 15kΩ$$
Is there a way to calculate the inductance of my coil from the DC resistance?
AI: An ideal ... |
H: What is the maximum physical current that can pass through a standard USB cable?
I am looking at hi-jacking an USB cable to supply to supply > 2.1A to the target. What is the physical current limitations of a standard USB cable?
AI: In July 2012, the USB Promoters Group announced the USB Power Delivery ("PD") spec... |
H: Why is inductor completely canceling out current?
I used this calculator to determine that my hand-turned inductor has an inductance of approx. .5 uH.
simulate this circuit – Schematic created using CircuitLab
When I measure this circuit on a multi-meter every node on the circuit is measured in mV. How is this pos... |
H: How to design, build and test synchronous sequential circuits using D-Flip Flops?
I want to design, build and test synchronous sequential circuits by using D-Flip Flops.
I know how to analyze state diagrams but I don't now how to obtain a state diagram using just outputs.
P.S. : This is a school project for my logi... |
H: Avoiding confusion between no input and a zero in binary?
Suppose I'm transmitting data through FM where 0 is 2Hz and 1 is 4Hz. The transmitter is transmitting 2Hz when there is no input. If I fed the recieved binary to a UART port of a microcontroller, how would the microcontroller differentiate between no data an... |
H: Capacitor in parallel with battery for high current output
I have a long-term application with very low quiescent current and infrequent pulses. I've spec'ed high capacity, low pulse current batteries that will give me the lifetime I need, and I want to charge a capacitor to handle the infrequent high current (regu... |
H: LM324 Pre-Amp For Mic (to PC) Not Working
I don't have much experience in circuit assembling or designing but I wanted to create a pre-amp for my microphone(Philips SBC MD110 Dynamic Microphone which I directly connect to my PC) to boost the signal levels. So I created one by refering this 2 mins video https://www.... |
H: Functionality of Accelerometers
Is it possible to do a speedo meter with an accelerometer ?
I am working with Arduino hardware.
AI: TL;DR Basically, no, for most situations.
Since acceleration is the derivative of velocity, integrating the output of an accelerometer should give you the velocity, however there are... |
H: How is VHDL used?
I'm new to hobby electronics/robotics and am trying to understand the use case for VHDL. The syntax is easy enough to understand, but I'm not seeing the "forest through the trees" on a few items.
For one, I'm trying to ascertain exactly what components of a digital system can be represented in VHD... |
H: e13007f npn transistor datasheet reading for turn on time
I am reading datasheet for e13007. You can get it here: http://www.datasheet-pdf.com/datasheetdownload.php?id=520587
(click on "Download PDF for PC")
In "Electrical Characteristics" section under turn on time it says 1.6 us (max value). Now in the figure 4.(... |
H: Who is responsible for Electrical shocks, high current or high voltage?
An electrical shock may cause burns, or it may leave no visible mark on the skin. In either case, an electrical current or voltage passing through the body can cause internal damage, cardiac arrest or other injury. Under certain circumstances, ... |
H: Component selection - difference between 4027 and 4027N flip flops
I am building a simple circuit that will use a J-K flip flop to enable me to use a momentary switch as a toggle.
The circuit diagram states that a 4027N should be used.
My local supplier has a 4027 in stock.
This is a really basic question I'm sure... |
H: Atmega2560 Usart Interrupt problem
When I send any data from serial port, RX pins are flashing but ISR is not running.
Here is my code.
#include <avr/io.h>
#include <string.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define F_CPU 16000000
volatile int NUMBER_OF_RECEIVED_BYTES = 0;
ISR(USART0_RX_vect)
... |
H: Norton equivalent current
I calculated the Norton equivalent circuit of a given circuit and I found the result is the same as my book provide, except for the sign.
Here is the circuit:
simulate this circuit – Schematic created using CircuitLab
So the circuit I've to analyse to calculate the Norton current is this:... |
H: Tools used to manufacture entire digital systems
I am new to electronics and am trying to wrap my head around the various tools used for producing various digital components.
My understanding of HDL languages like VHDL and Verilog is that they describe the behavior of chips/ICs and are ultimately used to fabricate ... |
H: Circuit providing output?
What does it mean for a circuit to provide an output power of say 1000W? Is "circuit providing power" referring to the battery supplying energy to the external circuit, or is it referring to the power of the components? In general I'm just finding the terminology used in electricity a bit ... |
H: What are these displays called?
I now searched the web for about an hour and just can't figure out how these displays are called or where to buy them.
A lot of airports use them for the departure table.
They seem to be just LED-Displays with a really strange dot layout.
Does anybody have an idea how these displays ... |
H: Is it possible to "crack" an ASIC?
Could someone break an ASIC?
If an ASIC is a fully customized, app-specific CPU, is possible to reverse engineer it?
I'd imagine the answer in general is no, since to me the only way to do this would be to keep firing inputs at the ASIC and see what it outputs. And if you don't ha... |
H: Best way to sync LED's to light NES figures on a wall clock?
Advice & Ideas needed...
Working on a project - a custom wall clock with perler bead NES sprites in the place of the numbers. The figures are mounted to a wood board with cutouts underneath, and during each hour an LED will turn on and light up the NES f... |
H: How to determine the end of data received by USART?
I am receiving some strings from UART in AVR. Strings are chaotic, not deterministic. It also includes new line \n and carriage return \r characters that's why I couldn't find a solution including checking bytes if they are \n or \r.
So is there a way to determin... |
H: How to figure out reason for last reset on MSP430?
There are a number of possible causes for a microcontroller to reset itself, for example:
brown-out or power-out
watchdog timer
reset initiated from software (to programmatically enter bootloader, etc)
I'm wondering if there is a way to figure out, when a microco... |
H: Can I replace a 1N4148 diode with a 1N4007?
My PC game controller broke and since I have some old PS1 controllers I was thinking about converting one to PC. After some googling I found all I need is a parallel port plug and some 1N4148 diodes. But I live in a small town in the mountains and is not easy for me to ge... |
H: faster extend 8-bit mask to 16-bit for MCU
Using an 8-bit flag register, the goal is to generate a 16-bit mask for manipulating a 2-byte settings register where adjacent pairs of bits control a channel, e.g. writing 0x2 (0b10) for channel 2 would be to take 0x04 (0b00000100) from the flag register and generate 0x00... |
H: How to check output after FPGA Implementation?
I have 10 numbers saved in RAM. I sorted it using Verilog code and saved output in another RAM. I did simulation and it was doing correct sorting. I synthesized it and generate bit file. Now i want to see whether it performing logically fine after FPGA Implementation ... |
H: Is it safe to use optoisolator for a longer period?
I have the following optoisolator PC817. It is a 4-Pin Phototransistor Optoisolator.
My idea is basically to control electrical appliances in my home. The power supply in my country is 230V 50Hz.
I specifically want to control tube lights in my room. The control o... |
H: DDR2 data rate and data bus confusion
I've been reading about DDR2 memory for the past few days and have got confused with some of the terms involved. I am mainly confused with discrete memory (single DDR2 memory IC) rather than DIMM module which consists of many such discrete ICs.
I understand that double data rat... |
H: Timing diagram of circuit involving switch debouncing
I have a push button switch (single-pole double throw) connected to a latch as follows:
I was thinking about the timing diagram of the circuit above (above image is the default state of the circuit when the switch hasn't been pressed down).
Would this timing di... |
H: Opto-coupler base connection speed influence
I am using a 4N25 opto-coupler for 5kHz to 10kHz application. In some datasheets the turn on and turn off times are mentioned to be 3us. I am wondering if this opto-coupler is suitable for my circuit's frequency. Doesn't it much distort the output which is supposed to tu... |
H: Measure human voice for ambient noise level
I need to develop an ambient noise level to measure the loduness in an office. Sometimes during the day people raise their voice more than they should and a lot of confusion is created. So this device should be installed somewhere, like on the table or on the roof, and it... |
H: Events in FreeRTOS 7.1.1
I'm looking for method how to inform one task in firmware about change somewhere else (Using FreeRTOS 7.1.1). I need to receive information about changes, but I wouldn't want check value in cycle - something like interrupts, but coming internal.
For example (in C-like pseudocode)
void task1... |
H: Impedance Matching a switching Circuit
I'm trying to mathematically model a Class E amplifier in the hopes of deriving a relationship between the input and output (Transfer Function).
One particular difficulty i'm facing is impedance matching the load to the rest of the circuit. The regular procedure would be to ob... |
H: What type of wire should I use to connect my buttons/sensors from 3 feet away?
So I've got a little prototype using some buttons and pressure sensors plugged right into the breadboard. My next step is that I actually put the buttons and sensors where I want them, but they're going to be about 3 feet away from the b... |
H: What does 'W/DIO' mean when used for MOSFET descriptions?
For example on Farnell: VISHAY SILICONIX SIHP18N50C-E3 MOSFET,N CH,W DIO,500V,18A,TO220AB
I've googled it in various forms but all it returns is other listings for MOSFETs with that in the title.
I also checked through a load of data sheets but couldn't see ... |
H: Alternatives to Arduino for controlling LED's and Audio files?
Simple Alternatives to Arduino
Has anyone used these different boards? If so, what did you use them for and why? Which are appropriate for controlling LED's and playing audio files? I'm looking for something basic and cheap that can be permanantly in... |
H: Eagle software: Different grounds in the same circuit
I'm designing an Arduino shield to manage the control signal that reaches 4 CCFL inverters.
As part of the circuit design, I've decided to use optocouplers to isolate the Arduino's microcontroller from the rest of the circuit. If I'm right, in order to get the p... |
H: Regarding the forces created in magnetic field
This is a homework question of type multiple choices , question and 5 choices are given below.
And a screenshot of the set up is given below.
These are the things I know
Forces are acting all the four sides of the frame due to the magnetic field and the current
I c... |
H: How many clock cycles does a RISC/CISC instruction take to execute?
According to Digital Design and Computer Architecture by Harris and Harris, there are several ways to implement a MIPS processor, including the following:
The single-cycle microarchitecture executes an entire instruction in one cycle. (...)
The mu... |
H: How does the Bias Drive in TI ADS1299 help in noise reduction?
I'm bit of a noob in electronics so please pardon me if this question is too basic.
I would like to clearly understand how the signal from the bias drive electrode can help in noise reduction, reducing baseline drift and other artifacts.
As a user put... |
H: For a 'customized' arduino consuming less energy making use of Attiny85 vs PCB Fabrication?
Currently I am working on a prototype project where I try to move a servo (6V) according to the level of light that is recognized by a photodiode making use of the ISR function. A torch light is used as the source of light.
... |
H: AC alternative for DC diode short-circuit protection
I have two sensors (represented in the schematic below by a switch) connected to a light. If one of the sensors trips, I would like the light to switch on.
The sensors and light are directly on AC, and there is where my problem is. In the DC alternative (on the r... |
H: Can I use an analogue switch with separate circuits?
I am planning on using 74HCT4066N analogue switch (datasheet) to trigger button presses on two separate gamepads at the same time. The circuit I plan looks something like this:
Can I use this analogue switch to control completely separate circuits? The problem, ... |
H: How many 115ah wet lead acid batteries are safe to charge in the same space?
We are using about 10 115ah wet lead acid batteries to provide electricity for our business in the field. At night, we charge them all in the same space. The space does have a bit of airflow, but it's not like we are leaving a window open.... |
H: Protecting I2C bus with diodes
I'm trying to add some protection to an I2C bus, and keep getting an unexpected result.
simulate this circuit – Schematic created using CircuitLab
In principle, I'd expect this to clamp the signal (which I simulate with a sine wave and a small resistor) to between -0.6 to 5.6V. In th... |
H: Current, Voltage, and Power Sensing for 115 V AC Circuits
I am trying to sense voltage, current, and power with an Arduino (Due) for monitoring and diagnostic applications. To get reasonably good input (better than Kill-A-Watt), I have designed an AC sensing front-end for the Arduino. As this is my first design, I ... |
H: How to position adjacent transformers so they don't interfere?
Using a couple of 240V mains step down transformers, undecided whether to use E/I laminated or toroidal, one 22VA the other 7VA. How to mount them in the case, so that they're not affected by each others magnetic fields?
This is unless I can find one re... |
H: Verilog Assignment
I'm designing a Fahrenheit to Celsius converter using algorithmic state machines. I'm trying to get the following code to run, but all I get for output is 0.
module FtoC(clk, F_input, C_output);
input clk;
input [8:0]F_input;
output [6:0]C_output;
reg [6:0] C_output = 0;
reg [1:0] state =0;
reg... |
H: Output charger indications
its a small question ...i got on my cell charger the indications as follow:
input:100-240 V 50-60 Hz
output: 5 V DC 1 A....
the question is what does the 1 A mean? i am new to circuits and etc..when plugging the cell then the current is created by the cell's total resistance and stuff ... |
H: Electrical spark generator
I need a spark between two pins with 5mm gap.
And I use this circuit:
Things changeable:
the characteristics of the transformer (ratio, coil windings, coil gap and ...).
The type of the MOSFET.
How to change these in a way that spark can heat the air between two pins up to 363°C? (mini... |
H: PCB design for automotive fusebox?
I am currently in the process of designing an automotive (motorsport related) fuse-box as a side project to my studies. I've not had much luck searching for fuse holders (20 position) however while searching I came across fuse holders for printed circuit boards. I'm wondering whet... |
H: Diode in parallel with resistor
SE,
I've used the SE:EE forum search and several search engines internet and haven't found a single question similar to mine. But I don't think that it's that complicated, I'm just having a hard time grasping what's going on.
The output from pin 1 is a square wave signal with a peak... |
H: Charging two batteries with one solar panel
I have two batteries connected in series. However, I'm using it to separately get +12V supply and -12V supply. I have a 24V rated solar panel, and was wondering if it's possible to charge the two batteries while in operation. Would it be possible to to connect the two ter... |
H: Solar Panel Charging with Arduino
I built a solar panel charge controller from instructables with an easy to read schematic and for some reason my battery charges up to a certain point and then loses charge again. That leads me to ask a couple of questions given that i am very new to this.
My Setup:
10W solar p... |
H: Creating an Integrated Circuit Component in Altium
I am new to PCB designing and I am new to Altium. I want to make a schematic, PCB design and simulate a RF circuit involving a GPS receiver front end IC MAX2769. Altium library does not have this IC. I can create the component in library and also its layout for PCB... |
H: Finding the gain with a photodiode
How would I go about finding the gain of this circuit? Here's a link to the datasheet.
Using our test apparatus to create a PWM on the diode, I get 1.16V out of pin 1. I can provide more information if needed.
Thanks,
Luke
AI: The BP104 has a light sensitive area of 7.5 sq mm. If ... |
H: Live switching AC loads with TRIACs or SSR
I have been designing a system whose purpose is to provide high reliability to a set of outlets (8), it takes to inputs of diffrent phases mains current, now the purpose of the system is that if the input we currently are using dies (Goes permanently to 0v) we would switch... |
H: Current flow on Load (A)
simulate this circuit – Schematic created using CircuitLab
From my analysis, and applying circuit theory, I find that Load(A) will have current flowing equal to 0.1Amps due to the PS, and the induced V1&V2 cancel out, without the use of a diode. However, there cannot be any induced-current... |
H: Three-phase Y and Delta Configurations Polarities
Please take a moment to look at the three-phase Y and Delta configurations pictures below (The pictures are screenshots taken from the “All About Circuits” online book).
The first picture (Y configuration) shows the neutral node with negative polarities for all pha... |
H: What is the relation between Op-Amp input current and input impedance?
How should I interpret these specs? They can't both be correct all the time, right? Looking at for example the CA3140 opamp.
the Zin (input impedance) is 1.5T Ohm, yet the input current is 10pA.
Solving this for voltage (Ohm's law, 1,5e12 * 10e... |
H: Using 1000x WS2811 leds and 5v 60amp Power supply. When do I need to re-inject power?
I've been reading a lot about the WS2811 LEDs and how to properly set them up. I've purchased a few thousand of them off of Ebay for various projects because they're so easy to use. So far I've only used a series of 100.
I've see... |
H: How to know exact Decoupling Capacitor values for supply voltages?
When designing circuits using various components such as IC's a lot of the time the data sheets give you an example schematic where they will usually give you some values for decoupling Capacitors. I usually see a 0.1 uF cap in parallel with a 10 uF... |
H: Use of RC circuit in amplifier output stage
I have to use a LM384 amp circuit (shown below) for a school project and need to explain how it works.
I've read the datasheet (http://www.ti.com/lit/ds/symlink/lm384.pdf) and thus have a guess about some components but others remain a mystery.
Vin potentiometer is only ... |
H: The purpose of voltage-dividers in op-amp feedback?
simulate this circuit – Schematic created using CircuitLab
So, here we have a typical op-amp with negative feedback. The non-inverting input is at virtual-ground, and if the input is higher or lower than ground, the voltage is inverted, and fed back into the non-... |
H: Zener diode minimum and maximum current
Why is the Iz max given before Iz min in this zener diode catalog? If you look at the list of diodes at the bottom, you can see that the maximum test current is given first. Is there something particular or it's just provided this way?
AI: Test currents relate to impedances s... |
H: list of general purpose smd transistors, diodes and mosfets
I want to start with building up a little stock of smd components.
But i'm not sure where to start. Is there a list of general purpose smd Transistors, Diodes and (mos)fets?
Thnx in advance
AI: Also check out Seeedstudio's Open Parts Library:
http://www.se... |
H: What is the best way to serve AC power to a 12v - 5v DC regulator with 1Amp current?
What transformer should I use to supply AC voltage in a circuit which is using 7812 and 7805 - Positive Voltage Regulators. I need approximately 1Amp current. What is the best way to minimize the physical volume of the supply? I sh... |
H: Using just one output of a J-K flip-flop
If I am using a J-K flip-flop, but only need one of the outputs, what should I do with the other?
Leave it disconnected, or tie it high/low (via a resistor?) Why?
AI: If it is an output, simply leave it unconnected.
If you try to connect it to a power rail directly, it will ... |
H: 7-segment blue LED display at 3.3V
I'm driving a blue 7-segment LED display with a TI CD4026BE on a 3.3V circuit.
I cannot find any data sheet for the display part. It has a common cathode pin layout and it's marked FJ5161AB on the side and D5611 A/B on the bottom.
At first I tried putting some conservative resisto... |
H: Why does POT cause current to divert?
I have a pretty basic question. I put this little thing together but I don't understand why the POT is causing this result.
When powered, if the POT isn't fully open. LED 1 is bright and LED 2 is dim.
When POT is fully open LED 2 becomes VERY bright and LED 1 dims slightly.
Sho... |
H: How can the SparkFun Lipo USB charger power other devices at the same time as charging?
How is this SparkFun charger capable of charging a LiPo at the same time as powering other devices? The Set up would look like this:
This is what the schematic looks like. Basically, my confusion is that the MCP73831 needs to ... |
H: How should I wire up ground when using an ATX power supply to power an Arduino and several LED strips which in return are controlled by the Arduino?
Forgive me if this seems like a basic question but I want to make sure I wire these things up correctly. Currently, I have several LED strips that I am controlling wi... |
H: Difference between single and dual rail op-amp
I don't understand why some op-amps are specified as being dual rail, and others as single rail. Since (AFAIK) none have a ground pin, there is no difference between connecting the positive supply to +10v / the negative supply to -10v, or the positive supply to +20v an... |
H: I didn't tin my solder bit...now what?
In my haste to get soldering with my new iron (first time soldering in more than a decade...) I completely forgot to tin my bit.
Subsequently I've managed to part-tin it, but it's a bit of a mess.
Other than buying a new bit for the iron, do I have any other options?
AI: It de... |
H: How does a negative feedback amplifier reach steady state?
I tried to simulate a negative feedback non-inverting op-amp, and got incorrect results.
I ran the following time-stepping code in python:
A = 100000 #open-loop gain
B = 0.75 #the feedback factor
V_out = 0... |
H: Overvoltage protection for RS485 inputs
I am using an Analog Devices ADM483E RS485-chip to build a device with RS485-capability. Datasheet here: http://www.analog.com/media/en/technical-documentation/data-sheets/ADM483E.pdf .
The finished apparatus is supplied with 24V DC, and now I'm looking to design it so that i... |
H: What is the Voltage output of this Unity gain amplifier?
This Unity gain op amp has a ac supply in line with the resistor to the positive terminal of the op amp. What is the formula to obtain the output voltage?
My challenge is the additional resistor otherwise if it wasn't there then I know that Vin = Vout
AI: Ign... |
H: 600 watts regulated DC for 3 seconds
In my area, due to frequent storms, there are frequently short mains power cuts lasting a second or two at most. While the shorter several-millisecond outages don't usually cause issues, the longer momentary outages frequently cause my computer to shut off, resulting in filesyst... |
H: What is the mechanism for capacitor explosion?
Capacitors (electrolytics, specifically) explode if you put reverse voltage or excessive voltage to them. How does this happen? Aren't electrolytics just two metal films with a seperator and doused in some electrolyte? What is the mechanism behind this explosion?
AI: T... |
H: Looking for datasheet for Alpha 21264C
Not too long back I did some reading on the Alpha CPU architecture and (probably out of a burst of nostalgic stupidity) procured a couple; there's only an issue - the ones I have are the 21264 C variant, that features an LGA pad-out rather than a PGA setup due to the increased... |
H: Reliable way to transport data over 1-2 km distance
I am looking for some way to transport data (around 3000Kbps) omnidirectional. Transmitter should not weight more than 300 grams but receiver can be much heavier. The range I am trying to achieve is 1-2km line of sight. Is there any reliable hardware to fulfill th... |
H: How to test/flash many modules?
Suppose I have several hundred pieces of the same module to test and flash, and the connectors themselves have wire holes in them like below. What's a good way to make the connection without soldering?
AI: Pogo pins and a custom test jig. Sparkfun has a tutorial on how they do it for... |
H: 16 segment LED sparkfun resistor help
I am quite new to this and am struggling to read through the data sheets of the Sparkfun 16 segment display, datasheet here.
I have managed to get all of the LEDs wired up through a LED driver, with 7v input and all pulling through a single resistor of 220 ohm.
As the short seg... |
H: Identifying windings of a single phase induction motor
How can I identify the main and auxiliary windings of a single phase induction motor which has only three terminals (1.Red, 2. Yellow & 3. Black) out of the device? How to connect capacitor and power supply to it?
AI: Tricky solution:
Measure the winding resist... |
H: Connect kindle 3 serial port to epson printer's 8 pin mini-din serial port?
I have a kindle 3 with a broken screen and an old EPSON stylus 1520. The kindle has a serial port with TX, RX, GND and 1.8v VCC (source). The printer has a mac compatible 8 pin Mini-DIN port.
Would it be possible to connect the kindle to th... |
H: Schmitt Trigger Functionality Not Working, Questions
I'm trying to build a Schmitt trigger like the one described here: http://pcbheaven.com/drcalculus/index.php?calc=st_nonsym_sp
However, it isn't working as expected, and I'm thinking it may be due to a number of reasons, only a few of which I have a suspicion of.... |
H: Can an IR transmitter be focused?
Can a transmitting IR LED (or an array of such devices) be focused into a finite area rather than allowed to spread out? I think this is how laser tag systems are implemented but I am not sure and I want to try this myself. If they can be focused, what what device can accomplish th... |
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