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H: FPGA Floating-point to Unsigned 32bits
Regarding something I read in a Xilinx manual saying this:
Because floating-point operations use considerable resources relative to integer/fixed point operations, the Vivado HLS tool utilizes those resources as efficiently as possible.
I was thinking about the following op... |
H: Transfer characteristic of p-channel JFET
Considering the output characteristic of the n channel JFET, can we somehow obtain the same characteristic only for the p-channel type of this transistor?
In R.Jaeger's book about microelectronics circuit design, only a vague description was given on how only the polaritie... |
H: Inductor in transformer
In an inductor, a current waveform 90° out of phase with the voltage waveform creates a condition where power is alternately absorbed and returned to the circuit by the inductor. If the inductor is perfect (no wire resistance, no magnetic core losses, etc.), it will dissipate zero power.
I w... |
H: Solid state relay doesn't turn off
I am trying to build a custom light setup for my computer desk. I want to use the scroll lock LED signal to control a pair of 12 volt DC CCFL lights run off the same inverter. The problem is when I plug in the CCFL's they just turn on and no matter what I run across the signal p... |
H: Protecting current measuring shunt resistor from overcurrent
To measure the current "drawn" by a 12V PTC heater element and to be able to switch it on and off from an AVR micro controller, I have come up with the circuit below.
The PTC heater element has about 2 Ohm cold and 8 Ohm at steady state and is powered by... |
H: STM32F030 analogue input pin impedance (does value change during conversion period?)
The analogue input pin impedance for the STM32F030 is listed as around 50K in the datasheet. Does this value apply only during the conversion period, or would it be higher when the pin is configured as an analogue input pin but no ... |
H: Why can't we test return neutral current with a tester?
The current that a load takes up comes into it from the live and returns through the neutral. We know that.
We test a live wire by touching it with a tester in one hand and being in contact with the earth. It GLOWS. But I tried to test a loads return current (... |
H: If I Don't Wire USBASP to ATmega 328-PU Will I Burn Out My Chip
This is a simple, noob question. I'm trying to connect a USBASP with an ATmega 328-PU. If I incorrectly connect them, such as put ground into vcc or miso into mosi, will I kill my chip?
AI: Yes, that is quite possible, so do not miswire it.
What you co... |
H: LM324 for 10,000x gain?
I'm looking to use the LM324n (http://www.ti.com/lit/ds/symlink/lm124-n.pdf) single-supply op-amp in non-inverting mode:
The goal is to take a voltage of around 100uV and multiply it to around 1V (i.e. let R1 = 100 ohms, and let R2 = 1 megohm), while supplying the op amp with +5V on one end... |
H: Is it really OK to supply more current than what the component is rated for?
In this heavily upvoted answer the answerer states that it is okay to supply a component with more current than what it's rated for. The analogy is that (paraphrasing here) "If Johnny wants to eat two apples, he'll only eat two regardless ... |
H: How to estimate solar panel output as a function of solar radiation
Apparently, according to EarthScience.SE, the measurement of how "bright" a given day is, is measured in units of kWh/m^2, known simply as "solar radiation". Apparently, 3 kWh/m^2 is the average brightness of an American summer day (useless fact).
... |
H: Increasing wire gauge by twisting pairs
I have a cable like this with 4 wires inside. Each wire is 20 AWG.
I've been told that I can twist the ends together (i.e. green and red, white and black) on both ends of the cable and this will effectively increase the wire gauge.
This would make perfect sense to me if the ... |
H: RIGOL Oscilloscope timescale "bug"
I assume this an already known "bug" but I'm unsure if this could be fixed or not.
Straight to the problem:
I feed my RIGOL DS1054Z a 20MHz sinusoidal waveform and set the timescale to 200ms/div. The output is the following:
(Sorry for the bad quality picture but the scope just d... |
H: Is ACS712 isolation sufficient for SELV?
Can the Allegro ACS712 current sensor be used to measure mains current with enough isolation so that the isolation between the mains (230V) side and the logic side of the sensor is enough to achieve SELV compliant isolation (see https://en.wikipedia.org/wiki/Extra-low_voltag... |
H: PIC 12F508 Logic Level Calculations
I am using a PIC 12F508 for a project and just want to make sure I understand the specifications in the datasheet for a logic low and a logic high.
Here's the datasheet for reference. The specs I'm using are on page 73.
The pin in question is the MCLR pin which I have set in the... |
H: Why PCB thickness in Microns
I have created Gerber files for one of my application circuit. While giving it for development, manufacturer is asking for thickness in microns.
My question is why thickness is given expressed in microns, not in mils/mm?
And what is start and finish copper thickness in PCB layout.
Thank... |
H: black level calibration in image sensor
For one camera, the black level of the sensor will make the output non-zero when it is covered. For example the output of the sensor is 10bit and black level is 63, if the output is reduced by black level, the range of the output will be 0~960. So the dynamic range is reduced... |
H: MAX14578 LDO connection not in use
I want to use MAX14578, I've looked into datasheet (http://datasheets.maximintegrated.com/en/ds/MAX14578AE-MAX14578E.pdf) and found it have an integrated LDO. But I don't need to use this LDO. Since I use BATT pin to power up this IC, can I don't use LDO? If yes, how should I conn... |
H: LCD Display text disappearing
I'm using LCD display and keypad to control my stepper motor. My stepper motor uses a 12Volts, 2Amperes power supply and I used L298N as its driver. My code functions well but the problem is everytime I plug in the power source for the stepper, the LCD starts malfunctioning. The displa... |
H: What is the purpose of transistor in this circuit?
"A zener diode voltage regulator is inefficient when the supply is used with equipment that draws high current. When a supply must deliver a lot of current, a power transistor is used along with the Zener diode as shown below"
After reading this statement,I still... |
H: Step down transformer
I have a 12Volts, 2Amperes transformer and I need a lower voltage and lower current power source for my other components. I want to know how to make a step down transformer i want to lower it up to 5Volts and 750mA... Can I make it that low?
AI: The below assumes you are using the correct term... |
H: What is a 3 wire type cross linked serial cable?
I'm trying to use a controller which uses Serial communication with the PC. The documentation says I need to get a 3 wire type cross link serial cable. Is this a null modem cable?
The following image is from the documentation.
AI: Yes - I would call that a Null Mode... |
H: Voltage stabilizer input/output current
What is the relation between the input and output current of a generic efficient ( not just a zener diode) DC voltage stablizer ie:
If the input voltage equals 15 V the stabilized voltage equals 12V and the output current equals 2A whats the input current of the stabili... |
H: Mosfet operating in cut off mode
Suppose we have an nmosfet that is in cut-off. What is it most commonly used for in this operating region? As a switch or as a variable resistor? I believe it makes more sense to use it as a resistor, because it has a long turn-on/off time.
AI: The subthreshold current is very small... |
H: Solving Schmitt trigger circuit using the superposition theorem
In order to solve a Schmitt trigger circuit implemented with an op-amp (or a comparator) connected in positive feedback, this wikipedia page uses the superposition theorem.
My question is : why can we use the superposition principle in this situation?... |
H: Overcurrent Protection Circuit
I'm pretty new to electronics and the first thing I want to have on a PCB is a simple signal source (sinusoidal 12V RMS ; 100 Hz Frequency). To not blow things up I want a current monitoring circuit which should disconnect the source if the load exceeds about 500mA. I came up with the... |
H: Why this nrf24l01 module has two VCC and two GND?
This module has two GND and VCC pins:
However, this module and this module only have one of each. Why is that?
EDIT: I know most MCU's have a lot of 3V3, 5V and GND pins. This is required for connecting the most varied peripherals simultaneously without exceeding ... |
H: Is using a ground AND supply pours on a 2-layer PCB a bad design decision?
Ground pour on the top, supply pour on the bottom. Does this typically increase noise? Is it considered a poor design decision?
It's certainly makes things easier from a routing perspective to pop a via down when you need to supply a pin wit... |
H: Wire Wrap Joint in High Humidity
How does a wire wrap joint compare to a soldered joint in high humidity conditions?
Corrosion? Electrolysis? Joint resistance creeping up?
AI: Properly made wire wrap joints are probably the most durable of electrical connections. I worked in the defense industry for many years dur... |
H: For production boards, is a buffer IC best to translate single unidirectional 3.3v to 5v logic without inversion?
I've read plenty of advice on how to deal with 5v <-> 3v logic translation and there seems to be a ton of methods, some of which I'm clear on and some I'm not. Most of the material is geared around thi... |
H: Multiple Motors and one H bridge
I am trying to make one H bridge for four identical motors. I do not want to make more than one H bridge by any means. I got a way to do that but I need your recommendation. I am going to make all the motors in parallel to each other so that the current, that comes from one branch i... |
H: How to calculate input and output impedance of BJT Common-Emitter amplifier circuit
Why is the input impedance not 260Ω in this circuit?
I calculated this impedance as follows:
\begin{align*}
I_B &= \dfrac{18.7V - 0.7V} {180kΩ} = 0.1mA
\\[1 em]
r_{\pi} &= \dfrac{26mV}{0.1mA} = 260Ω
\\[1 em]
R_{in} &= \dfrac{180kΩ... |
H: Calculation of a voltage in the frequency domain
The current generator provides a constant current \$I\$ and the circuit is at règime conditions. At \$t=0\$, the switch T is being closed.
I have to calculate the voltage \$v_c(t)\$ by using the Laplace (unilateral) transform.
simulate this circuit – Schematic crea... |
H: In depletion MOSFETs, what is the drain current value when \$V_{GS}\$ is zero?
When \$V_{GS}\$ is very negative \$I_D=0\$, whereas it conducts a little current when \$V_{GS}\$ is a little negative.
What is the value of \$I_D\$ when \$V_{GS}=0\$?
AI: The value of \$I_{DS}\$ when \$V_{GS}=0\$ is called \$I_{DSS}\$ on... |
H: Determine adequate speed of flyback diode for a relay
I have already looked at this question which looked like it would provide the answer:
How to choose a flyback diode for a relay?
But it didn't, so I also checked out these:
https://electronics.stackexchange.com/questions/ask
Flyback Diodes and Relays
https://el... |
H: Where to find Advanced Schottky TTL Schematics
I am currently having difficulty locating the circuit diagrams/schematics for the Advanced Schottky versions of the 7400 IC series. While the standard TTL data books seem to have depictions of the L,LS,H, ect, the volumes dealing with both ALS and AS do not seem to co... |
H: DC Motor Rotate Direction
What are possible solutions for changing DC motor rotate direction controlled by microcontroller? I know that H-bridge is one possible solution, but i want to use 2 pins for control only.
AI: Two half bridges or two SPDT relays will allow you to control on/off and direction with two pins. |
H: I don't understand transformer power ratings
I'm befuddled. I have a wall wart power supply that supplies 65W (it's for an Intel NUC). I'm interested in building my own power supply that will put out... several different voltages and currents. So I go to mouser.com and try to find an appropriate transformer. I ... |
H: How does an electronic shocker works?
I'm new to electronics but I want to make this diagram from "Instructables" :
I have everything I need from a camera... I also realized, using a different transformer, that the sparks are made only when the battery is deconnected and reconected repeatedly, like in this video. ... |
H: Using a capacitor to properly power a servo
I recently attached a servo to my Arduino for the first time. I ended up needing a 470uF capacitor wired like this tutorial shows because my servo was freaking out and causing my laptop to throw "power surge" warnings (I have my Arduino connected to my laptop via USB).
Al... |
H: Driving MOSFET with 555 timer
I am building a plasma speaker using a 555 timer to generate the audio tone. I am driving a mosfet with the output of the 555 timer, which in turn powers a flyback transformer to generate a plasma arc. I have heard conflicting information about putting a resistor in between the 555 a... |
H: Wire wrap wire quality
I am looking at two kinds of wire wrap wire on Amazon.
The first is the better, more expensive kind. It is silver plated and has Kynar insulation.
http://www.amazon.com/dp/B006C4AGMU/ref=biss_dp_t_asn
The second is a cheaper kind. It is tin plated and has PVC insulation.
http://www.amazon.com... |
H: torque of locked gear motor vs gearless motor
Do gears increase the torque of locked/stalled motor ?. I understand that in case of rotation of shaft the gears will increase the torque because of transmission to slow rpm. But what makes difference in case of stalled/locked shaft?
AI: A reducing gear box can be model... |
H: Choosing an Audio D/A converter for I2S digital audio based on 32fs
I'm hoping someone can either verify or clarify my understanding of interfacing an Audio D/A converter to a device that sends audio over I2S.
I have an Audio Codec chip, the VS1063A (Datasheet), that is capable of sending 16 bit I2S data to an ext... |
H: Non-diode OR-ing solution for n equivalent power sources
I wish to allow powering my circuit using at least one of 3 connectable periphals. For example, my application could have 3 usb ports that each connect to different usb hosts. Any combination with at least one connected periphal should be able to power the ci... |
H: Filtering Capacitors before the fuse or after the fuse while limiting inrush current?
There are basically two questions I have for this circuit.
1) Which capacitor configuration is good? before fuse or after fuse
2) How do I limit my inrush current?
My thoughts:
I am confused between weather to put filtering capac... |
H: why do rectified voltage boosts after adding a capacitor?
So I found this 9V 1A AC power supply laying around and decided to make a DC source. I rectified and added a capacitor to make things a bit even. After adding a capacitor my voltage boosted from 9V to 14V. Can somebody explain why this happened for me? (may... |
H: Is it ever useful to add a capacitor between op amp inputs?
Is it ever a good idea to add a capacitor between the inputs of an op amp?
I'm building an electronic load roughly inspired by some of the Dave Jones derivative circuits out there. I've adopted the standard of being able to fully explain the role of each c... |
H: Is resistor on LED's necessary after voltage drop?
Let's say we have perfect 5V DC 0.1A power supply. Obviously for one LED we would need a resistor (I'm well aware of Ohm's law), BUT what if we connect bunch of LED's in series. And the current drain is well above the power supply, so voltage on those LED's drops t... |
H: Can someone explain a couple of lines of Verilog to me?
I'm a student trying to learn Verilog on my own with a dev board. This is just a simple and short module. I just need some clarifications.
module BASIC (CLOCK_50, KEY, LEDG);
input CLOCK_50;
input [3:0] KEY;
output reg [8:0] LEDG;
reg [2:0] key0_dly;
always... |
H: How to identify old microcontrollers?
I have several old microcontrollers, I am sure I bought them over 10 years ago. It is my assumption that the numbers on these would still be categorized, but I cannot find a way to search the internet by the number to find out what I can use these microcontrollers are for. Wh... |
H: How or where can I get a 120VAC to 3.3VAC power supply?
I'm using a safety gas valve (commonly found in household stoves) for a hobby project. The valve is rated for 3.3VAC, 3.6Amps. The problem is that AC-to-AC power supplies are quite rare, and I had no luck at all finding one that would match the rating above.
... |
H: Calculating gate resistor value for enhanced active-region stability
I'm working on an electronic load design driving an n-channel MOSFET with an op-amp.
I'd like to consider adding a gate resistor (R3 in the schematic) to improve the stability.
I've searched quite a bit, but have been unable to find any hard desc... |
H: JTAG boundary scan registers
On the internet, it always shows that each pin of the IC has its own Boundary Scan register (the yellow boxes)
But looking at BSDL files there are actually more BS registers than pins.
So for the questions:
Is it right to say that there are always more BS registers than pins?
What are... |
H: TS2950CT50 Voltage Regulator +5V confusing specs / usage
The datasheet for the TS2950CT50 voltage regulator only provides information on the series TS2950C and TS2951C. From what I can tell, TS2950CT50 is a model within that series, which is a fixed +5v regulator. But the circuit diagram in the datasheet only shows... |
H: What kind of material of PCB should I choose to work at -40 degree centigrade?
I need to design a PCB circuit to work at (or even below) -40 degree centigrade. Normally, I use FR-4 PCB board at room temperature. However, I have learned from the question "What is the minimum temperature for FR-4 PCBs?" that FR-4 PCB... |
H: Could you explain how this current measurement circuit works?
I have a schematic for current measurement, but I don't really know how can I calculate the output of it. The op-amps are on +-12V. The output of the circuit is 0.2*I(Rs) [V] (--> this is what I don't know how to calculate), thus in the range of 5V, we c... |
H: Driving a large, noisy, free-wheeling DC motor (cooling fan)
I have an automotive cooling fan which is nominally 12v and draws about 15-25A with a BIG inductive spike at startup (will happily blow a 30A fuse).
These are traditionally wired via standard automotive relays, but I'd like to drive it from a FET or simil... |
H: Why the voltage of supply got stuck when connected with leds?
I was working with some smd LED's trying to make their V-I curve. For that purpose, I connected two segments parallel to each other each containing two leds as shown, to a regulated dc power supply directly.
The voltage from supply was increased gradua... |
H: How does this BJT transistor circuit works?
I just wanted to know a little more about this circuit about how it works a more in depth analysis I mean. I know there's some kind of differential amplifier and a Zener diode for voltage regulation connected to a voltage divider. (correct me if I'm wrong).
And I can not... |
H: Why are some common-mode chokes rated in ohms instead of henries?
Some common-mode chokes, including this one, are rated in ohms instead of in henries. Why? Isn't the impedance injected by the common-mode choke entirely frequency dependent? Is there an assumed frequency at which the specified ohm-age is calculated?... |
H: Reverse audio jack for front and back speakers
My problem is a strange one. I have a computer connected to front and back speakers via 3.5mm audio jacks. Sometimes I use the computer with the monitor at my desk. Other times I'm using it to watch movies on a projector on the opposite side of the room.
Depending on w... |
H: How to cut costs when fabricating large PCBs?
I've looked online at PCB fabrication companies, and they invariably price their boards according to the size of the board as the primary factor.
Why is this? The physical board itself isn't that expensive, is it? I'm guessing it's because the size of the boards dictat... |
H: Crystal Footprint Placement
Pretty simple question, please point me in the right direction if this has already been asked.
I am designing a board around freescale's IMX23 microprocessor which runs from an external crystal at 24 MHz. I know that I need to keep the crystal close to the proc, but does it matter if th... |
H: Stop mask error upon running DRC in Eagle 7.3.0
I'm working on my first board layout using Eagle (7.3.0). I've got the layout done, but when I run DRC, I get a number of Stop Mask errors:
These seem to be due to small rectangles on the tStop layer (layer 29). If I hide the tStop layer, the errors go away, but I do... |
H: Are transistors interchangeable?
I do know the question in the title is really stupid, but it is the best phrasing I could come up with. Let's say I am building a circuit and the schematic says to use a BD139 transistor. Would there be any issue in using any other NPN transistor? What would I do if I could not f... |
H: Determine input frequency of square wave w/ ICR in Atmega328p
I'm trying to obtain the input frequency of a square wave using the input capture register of an Atmega328p. So far, it works sporadically -- which is to say, when I input a 75 kHz square wave, the output looks like this:
244
244
75117
74766
75117
75117
... |
H: VHDL code for 4 bit binary division without using the division sign. Getting a warning that DIV.vhd(39): (vcom-1246) Range 3 to 0 is null
-- logic taken from https://en.wikipedia.org/wiki/Division_algorithm
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.all;
ENTITY Div IS
PORT(
OperandA ... |
H: Periodically reset microcontroller
I have a tiny embedded system build around a Holtek HT48F06 microcontroller to monitor RFID tags (RDM630). Unfortunately it only detects the arrival, not the removal of a tag. As a workaround, I want to reset the microcontroller periodically (say once per second), since that trigg... |
H: Why is RAM not put on the CPU chip?
Modern CPUs are very fast compared to all things external, including memory (RAM).
It is understandable, since CPU clock frequency has reached a point where it takes several clock ticks for an electric signal simply to run from from the CPU through the bus to RAM chips and back.... |
H: How use DMM thermocouple probe hands-free to monitor heatsink temperature?
I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the temperature of a power transistor and/or... |
H: Use SCR dimming info to feed 1-10VDC line
Hello I am modifying an electronic lighting fixture to use LED instead. I have everything I need already, 80W LED, Power Supply, etc. There are just two issues I cannot resolve.
The original fixture uses SCR dimming chip (controlled by electronics/computer) to power and di... |
H: Optimizing a boolean expression to (NAND,AND,NOT) system
I'm trying to simplify the expression given by the following Karnaugh map to an expression that is using only NANDs, NOTs and ANDs- the less gates (of any kind), the better.
I know how to optimize it to an (OR,AND,NOT) system, but that doesn't seem to help.
... |
H: Operating flow switch on a DC voltage
I plan to buy a low flow switch for my heater protection from Mcmaster (2371K4, 0.1GPM set point). The catalogue says that the switch operates on 120/240VAC supply. Would this switch be able to operate on 14V DC supply and a max 40mA current?
Regards,
DPK
AI: Maybe. Perhaps eve... |
H: calculate Amp Hours when voltage is given
I'm trying to wrap my head around how exactly Amp Hours work.
I have been trying to figure out this question for a while now, but can't seem to find the information that I need.
This is the circuit, and the information given is that the battery has 20AH capacity, and has a... |
H: does changing UART stop bit number configuration (receiver side) affect message correctness
I'm using USART on board to display messages on desktop PC terminal using Realterm
I noticed that, when I change stop bit number on Realterm, it does not affect the correctness of the message, contrary to baud rate, or bit n... |
H: What are the different grounds on a PCB?
I am working with boost converters recently. I have problem which you can find here.
After going through the datasheet several times I encountered the special focus on the ground plane. It talks about different ground nodes. I have no idea what it means. I would be grateful ... |
H: Digital Input Clamp Circuit Protection
To be able to connect some peripheral to digital input, I'm designing the circuit protection to avoid any possible failure due to over/under-voltage issue. So, I will add a clamp protection circuit.
The requirements I need to accomplish are:
Power Source (Vcc): 3V3
Max Volta... |
H: How can I evaluate a potentiometer susceptibility to change?
I have a usage case where I would like a potentiometer for controlling the charge going to a lead-acid battery via a IC. It would be susceptible to some (although not extreme) vibration, such people carrying it around and various bumps.
It would for most... |
H: DSP Cutoff vs Sampling frequency question on low pass filter
Is it unrealistic to have a 125 MHz sampling rate with a cutoff frequency of 5 Hz? I downloaded a few filter programs and used their methods and it seems that even with thousands of taps it still looks pretty bad. Is there a better way to implement this d... |
H: Input Characteristics of MOSFET in triode region?
When a MOSFET is operating in saturation region, i.e. \$V_{GS} > V_{th}\$ and \$V_{DS} ≥ ( V_{GS} – V_{th} )\$, the drain current equation clearly indicates the parabolic relation between the drain current and input voltage:
\[
I_{Dsat}=Kn' \cdot \dfrac{W}{2L} \cdot... |
H: Resistor values for a passive audio mixer?
I'm trying to come up with a schematic for building a passive audio mixer for an aviation headset, but I'm having some questions about resistor values. Figuring out the general circuit is easy enough, but I'd like to bounce this off people who know a lot more than I do so... |
H: When using nodal analysis of a circuit involving CCCS, how do you know which currents are entering and which are leaving?
I am trying to solve the following circuit:
I believe the answer I'm getting for \$i_b\$ is wrong because I put it into LTSpice and I'm getting that \$i_b = -3.63636\$
This is my LTSpice diagra... |
H: Driving a large array of LEDs (~600)
A colleague and I had the idea to build Conway's Game of Life in a large 8x8' form factor using a 50x50 grid of RGB LEDs (RGB so that the grid can be re-purposed in the future). The idea is to build this thing in 4x4' sub modules (25x25 LED arrays) that can be driven separately ... |
H: Can I use a NPN Transistor as a Varactor Diode?
I am currently building a crystal controlled AM transmitter. The circuit that I'm using call for a NTE – 613 varactor diode (which will come in a few days). I was wondering if there was an alternative to the director diode that I could use for the meantime to test the... |
H: VHDL Counter does not update when desired
For a project I am working on, I require a counter whose value increases as soon as the increment control goes high (i.e. on the rising edge). However, I have had trouble implementing this in VHDL.
Here is some code that I have written:
IF Reset='1' THEN
count := 0;... |
H: What is this SMD component
Just out of curiosity I am trying to find out. What type of component is the green flat one in the picture?
AI: It is a Polyfuse- a kind of self-resetting current limiting device. There are a few different names for them. Here is a datasheet.
As far as names go, here is Wikipedia's ta... |
H: What is this 60's-80's era component?
My friend owns a factory with a very old machine. This component appears to have failed, but he does not know what it is. It is likely that it is a much larger version of a modern component.
Here is some context:
This panel has a few 3-way On-Off-On switches on it, which rais... |
H: Why is Leakage Current Important when a MOSFET switch is "ON?"
Referencing ADG5206. ADI has specs for Drainage Current at the Source and Drain when the switch is OFF. They also have channel leakage for Source and Drain when the switch is ON.
Why is it important to have specifications for leakage current when the s... |
H: Transformer showing unexpected values
I have setup a step down transformer to transform my 115v AC down to 5v AC. I ordered a transformer and hooked it up in parallel (there are two coils) and my oscope is showing 10v on the output side. There isn't any load on the circuit. Is this similar to show an unload DC circ... |
H: Am I getting DC bandwidth correctly?
I am computing Johnson and shot noise in a DC circuit, where I have an Arduino Due sampling with "delay(100);", i.e. at 10Hz.
Sampling rate and bandwidth follow Nyquist sampling theorem. According to this theorem, the sampling rate should be at least twice the bandwidth of the ... |
H: RC snubber across switch or inductor
What are the differences one should consider between designing an RC snubber across a switch and across an inductor? Is there any preference for putting it across the switch?
AI: A RC snubber can be placed over a switch, sure. Just remember that electricity is not instantaneous;... |
H: shift register RGB led brightness
I'm currently using 74HC595 shift register to light leds. Recently I decided to start using RGB leds instead of simple 1-color leds. Which means that I now have to use 3 output pins for each individual led. So far so good.
The problem however, is that I cannot fully enjoy the power... |
H: Which 9 V DC Adapter Need for MB102 Breadboard Power Supply
Easy question. I'm a noob... I bought a MB102 breadboard power supply unit. But, it doesn't come with a manual. I need to get a 9V adapter for it. So, I'm not sure what I need.
Does the 9V adapter's current matter or will any 9V wall wart work? What is ... |
H: Feedback in hybrid power supply
During my research of PSU I came across schematic from Linear's datasheet:
1) Whats the purpose of node which is going from output to SW pin of buck converter?
2) Is node which provides 6V headroom for LDO sufficient for normal operation of PSU?
AI: 1) The two Schottky diodes and ca... |
H: Why does Samsung mobile phone batteries come with a chip-like paper? Are they spying on us?
Yesterday I saw a WhatsApp message. In that, one person is showing the Samsung phone batteries.
He removes the wrapper and takes out the black color thin paper or plastic sheet which is attached with the body of the battery ... |
H: question about charge pump circuit
My charge pump circuit is giving increased Vload in simulator, about 22v.
but when I breadboard and test, with Vsupply from a 12V power supply, multimeter shows Vload about 11v.
I've tested changing parts of same model but still getting same voltage so I think my parts is working.... |
H: ADC 'ADS1130' Wiring Problem
I am hacking a commercial board which uses ADS1130 for analog to digital conversion. Wiring in commercial board is a bit different than what is specified in datasheet. In commercial board, Pin number 4 is connected to Pin nummber 1 i.e 4 is connected to VCC. But datasheet indicates that... |
H: Depletion NMOS that's saturated at 0V
May seem like a weird request for a part, but are there any Depletion NMOS out there that is already saturated when you apply 0V to gate or if the gate is not connected?
AI: Infineon make them. See this for example but I wouldn't consider it sensible to leave the gate open on a... |
H: Why does SPI flash has HOLD# pin, as opposed to stopping the clock?
A SPI flash like Micron M25P16 (shown below) has a HOLD# pin, and any input data is ignored if HOLD# is asserted at a rising clock edge.
But can't the clock just be stopped instead ?
AI: The HOLD# signal for use in an SPI bus with multiple slaves.... |
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