text stringlengths 83 79.5k |
|---|
H: What are the jitter characteristics of PLLs internal to Stratix V FPGAs?
I am interested in knowing the deterministic and random jitter characteristics of PLLs internal to Stratix V FPGAs. I have looked through the Stratix V handbook but could not find numbers quantifying the jitter of their PLLs.
What are the jitt... |
H: Reducing voltage using a resistor
I want to know how to reduce an AC voltage of 175 V to 110 V using a resistor. The device I am using is 200 Watts, 110 V but the voltage from the source is 175 V. What value of resistor should I use to shed about 60 volts AC?
AI: Assuming your device is resistive (which might not b... |
H: Will this relay handle my current and voltage requirements?
I have this relay: SONGLE SRA-24vdc-cl
I want to use it to run 240V 11A device.
I can see in the datasheet it can be up to 20A (section 7, line 4-5), but the relay is so small and its legs so thin, so I am asking here before connecting it.
The 240V devic... |
H: Circuit analysis?
So far I've learned these circuit analysis techniques for:
Tellegen's Theorem
Using only KCL
Using only KVL
Solving a system of equations that consist of all KCL equations and all KVL equations
Nodal Analysis
Superposition
Mesh Analysis
When do these techniques allow you to completely analyze a ... |
H: What is a Charge?
I'm a high school student. I love computers and electronics. Few weeks ago, I thought to build my own electronic gadget but, unfortunately I had not much knowledge in electronics. So, I decided to learn. After Googling here and there, I came across a large amount of information. Nothing, except on... |
H: How multimeters measure current in this circuit?
simulate this circuit – Schematic created using CircuitLab
In the circuit shown if current is flowing from negative side of battery to positive side
how multimeter can know the existence of resistor before electrons in wire hits the resistor?
I mean how multimeter m... |
H: Can I determine if my Electro magnetic field (EMF) measuring device is in very close proximity to the source of EMF?
I am trying to solve a problem of identifying programmatically if I (or my measuring device) is in very close proximity to an EMF source.
The situation is, I have an EMF emitting source (sorry if I g... |
H: Mysterious voltage drop then slows climbs back up when powered off
Ive built a simple circuit on some strip board, just a motor and a micro controller and LED and powered by 6 AAA batteries. The motor takes its power straight from the battery and the micro and LED go through a 5V LDO. I also have a slide switch to ... |
H: High-Sensitivity, Low-Latency Imaging Sensor
This might be a bit of a long shot for this venue, but: I'm looking into sensors for a scientific imaging application where the key is excellent sensitivity (quantum efficiency and noise performance) combined with low readout latency.
I don't need a lot of pixels, someth... |
H: What does FCY / F_CY stand for?
I've come across many equations in microchip datasheets that are based on this value and am looking for a central place to lookup definitions.
F_OSC = oscillator frequency
T_CY = 1 / F_CY = time to execute one assembly instruction?
AI: Microchip has a glossary here. "FOSC" is listed,... |
H: Reduce voltage on PSU from 52V to 12V
I'm building a mining rig and is planning on using a ESP120 HP 3kW 52V power supply. I've seen someone get it down to 48V with this mod, but I wonder some one got it down to 12V? Or is it not possible?
AI: You would be better off to distribute the 48V-52V to the motherboards in... |
H: Can an electrostatic loudspeaker be considered as a capacitor?
A basic capacitor works as two parallel plates carrying opposite charges and have an electrostatic force holding the charges in place (without making any contact); can't an electrostatic loudspeaker be considered a capacitor since it works by having a c... |
H: Detect Arduino power failure and save data
Prologue
On an Arduino Mega, I need to save data into the EEPROM (about 40 bytes) in case of power failure. The data is constantly changing (steppers position, speed, etc), but since the EEPROM has limited write cycles, the data needs to be written only when a power drop i... |
H: Switching LED with a transistor
I would like to switch a 350mA LED with a transistor. Switching is done by a 5V microcontroller and the main voltage is provided by a 24V power supply. To play around and see what works I used Yenka, so I'll use screenshots from that.
As I understand this is the conventional way to d... |
H: Why is my simple counter VHDL not working? Where did my signals go?
I'm a complete beginner with VHDL and an almost beginner with digital logic and I'm having a problem working through a book I'm reading. In particular, an exercise asks to build a counter with an enable and a reset switch. I implemented it one way ... |
H: Do unintended latches only happen for signals in the process sensitivity list?
I read in one book that an unintended latch requires you to have a process section where there is a signal in the process sensitivity list but don't assign to in every path. But that doesn't make sense to me, because for example you don'... |
H: Applying heat to a transistor
I witnessed an experiment in which a transistor was connected to an led and a power supply.
A lighter was used to heat up the transistor and this reduced the resistance of the circuit and made the led light up brightly.
Why does heating the transistor do this ?
And if this works with ... |
H: Isolating 220V AC from low voltage DC on the PCB
Below picture is the rectifier section of design on the PCB:
The space between AC and DC voltage is ~2 cm, except at the bottom that I put four M3 holes which I'm going to drill and connect them to each other.
The relay control part is going to connect to an opto-is... |
H: Will this UVLO work?
I'm referring to one answer here
What if (power supply) was 24V, the VCC is 3v3 delayed by 1 second?
If you apply power then your (power loss detect) will be higher than the Vcc rail for 1 second? I don't imagine this to end up well.
In my mind i need an (and gate) that is activated by the C... |
H: Signed Overflow Detection
I am a beginner at verilog and encountered this problem:
Assume that you have two 8-bit 2's complement numbers, a[7:0] and b[7:0]. These numbers are added to produce s[7:0]. Compute whether a (signed) overflow has occurred.
Now my answer to the asked value of overflow was
assign overfl... |
H: Unknown characters in the serial monitor
I am trying to sniff the UART communication line of a commercial BLDC controller. The UART port connects to the Bluetooth module and the Bluetooth module connects to an Android App. I am able to get the baud rate right with some hacking, but it seems that after the successfu... |
H: The Intuition for RLC circuits
I'm reading through Hayt's Engineering Circuit Analysis 9e and it does a fairly good job of giving the intuition for "where" the energy is going in a damped RLC circuit, but I'm hoping that someone here can help me get full closure.
Consider a parallel RLC circuit with no input and wh... |
H: Connect a Switchboard to Arduino
Sorry if this is a simple question, but I‘m quite new to Arduino. What I‘m looking for is a way to connect 100+ strain gauges to one Arduino board.
Now, those each need a separate ADC (HX711) to convert the input from snalog to digital (best would be if only 1 was needed)(Also, I u... |
H: Copper Coil and Electromagnetic Induction
Waiting for answer
Does mixing thickness of wires affect the Induction?
What I mean is that I've like some 2mm and 1mm copper wires joined together.
Basically I remove insulation on copper wire ends and then I just tie those wires. After that I just tied those 2 wire ends.... |
H: Unexpected output voltage in opamp (LM741, DC, single supply) circuit
As a beginner I tried to make a simple DC circuit with an opamp on a single supply. This is what I came up with:
simulate this circuit – Schematic created using CircuitLab
I use R3 and R4 as a voltage divider to get 1V between the inputs of the ... |
H: Transformer open circuit output voltage and current limiting resistor at gate of Triac
Im kinda new to electronics and have some questions before i solder my projekt together. I want to make an Arduino controlled soldering iron and designed the circuit below. The optocoupler i used is a LTV-817 and by iron i mean t... |
H: Design an emitter follower to operate in the audio range (20 Hz - 20 kHz)
I am now self-learning with the "Art of Electronics" book by Holowitz and Hill, and I encountered a problem understanding one example from the book. Here it is:
And here is the explanation for the calculation of the circuit:
A. Emitter foll... |
H: Can transformers be used to adjust capacitors?
It seems capacitors are subject to a "quality triangle", where we can only pick two out of three desirable traits:
High voltage rating
High capacitance
Cheap
For example, a high-voltage high-capacitance capacitor is not likely to be cheap.
But, can we get around tha... |
H: 1N4148W-7-F Diodes
I'm building a DIY keyboard. All the build logs I've seen use these diodes:
https://www.digikey.com/product-detail/en/diodes-incorporated/1N4148W-7-F/1N4148W-FDICT-ND/815280
I'm trying to source the diodes locally, and have found these:
https://www.reichelt.de/schalt-diode-100-v-150-ma-sod-123-1n... |
H: Figure out the Resistance Value With Known Device Specs
I'm learning electronics and trying to find the right resistor value for my device: a Eachine Rotg01 Receiver.
The specs
Working Current 200mA/5V
Power Supply 5V(by smart phone)
I don't want to fry my receiver so I was hoping to get some confirma... |
H: How Power measured by Meters is affected by Harmonics?
I want to know how energy meters (Electro-static or electronic) measure Energy (let's assume power, ignore time) when there are harmonics present.
I know what are harmonics, how are they generated and how do they affect actual power. I read that harmonics power... |
H: Mean Well power supply gives wrong voltage output?
I have the Mean Well PT-45B power supply (data sheet here). It has three channels, which should give 5V, 12V and -12V, as I understand.
Pin 1 and 4 or 5, and pin 6 and 4 or 5 should give 12V and -12V respectably (as of my understanding).
The issue is when I conne... |
H: Return path for current flow in transmission lines?
We know that all current flow in loops, i.e. if they start at a source they must come back to the source. So for transmission lines, does the current that flow through our appliances in our homes go back to the generating station? If yes, how?
AI: Transmission lin... |
H: Star to delta transformation circuit
Is it possible to use star-to-delta transformation on this specific circuit below? If it is possible, can someone give me a hint on how to do it?
I tried to do delta-to-star transformation and got the answer, but unsure with doing star-to-delta transformation on this circuit sho... |
H: Why does LED dim when adding second LED in parallel with a single resistor
If I have a led hooked up to a 12v DC supply with a single resistor it runs nicely as you would expect. If I add a second LED in parallel the brightness drops, slightly, the brightness on both is (to my eye at least equal). My antiquated pri... |
H: How to design wireless charging coils so they are resonant?
I am continuing from this question: What can I use to increase efficiency of inductive wireless energy transfer instead of factory manufactured ferrite plates?
I am trying to make somewhat efficient wireless energy transfer for charging a 190mAh 3.7V batt... |
H: Why parallel resistor for oscillator?
I have a design with a W65C51S ACIA IC, which uses a 1,8 crystal MHz for serial communication. The clock generation example in the datasheet shows an external 1 MOhms resistor in parallel to the crystal.
It seems that the crystal doesn´t produce any clock signal if the resisto... |
H: Is the voltage divider in this circuit backwards for what I'm attempting to achieve?
This circuit is from another post (from long ago) where a user helped me build a circuit which would use a BJT as a switch.
simulate this circuit – Schematic created using CircuitLab
The problem was that I needed to lower the volt... |
H: 3.5/3.81 pitch connectors
I've got a device that the manufacturer claims uses a 3.81mm pitch connector. I measured the actual distance between pins, and it appears to be 3.5. I'm now noticing that some connector manufacturers refer to a "3.5/3.81" connector. I obviously don't want to buy the wrong one. If a con... |
H: Mosfet LC oscillator
I'm looking at the following circuit:
simulate this circuit – Schematic created using CircuitLab
It consists of an oscillation whose frequency depends on the tank circuit (C1, L1 and L2). When the voltage of the tank circuit reaches 0v the mosfet that was conducting stops conducting and the on... |
H: Circuit Analysis of an Outlet Tester
I have an Outlet Tester like this:
It is used to see the mains electric connection, it has the next states:
I opened it and then I reversed engineer it. The diagrams I obtained are these:
I would like to make the circuit analysis (Kirchoff's Laws) but I don't know how to appl... |
H: Latching Switch Pinout
I'm planning on incorporating a latching switch into my design:
https://lcsc.com/product-detail/Electrical-Switches_XKB-Enterprise-XKB8080-Z_C318860.html I also found the corresponding datasheet: https://datasheet.lcsc.com/szlcsc/1912111437_XKB-Enterprise-XKB8080-Z_C318860.pdf However, the pi... |
H: Schottky diode / Rectifier Diode difference and how to test them?
I have 3 diodes that I would like to test
1x USD935
2x USD2009
USD935 is identified by its datasheets as a "Power Schottky Rectifier Diode". I cannot find the datasheet of the USD2009 but they have similar test readings. So I'm assuming they are ... |
H: How to increase output voltage of an op amp well above the supply voltage
I have a circuit which produces a (not high speed) signal between 0 and 9 volts with an adjustable slope, and I would like to increase this output voltage to between 0 and 200 volts, which keeping it ground referenced.
Currently, I am using a... |
H: Upgrading Xiaomi HIMO C20 battery
Does any one know what is the charger port is for Himo C20 Ebike battery?
I ordered mine it's on its way now I couldn't find the information online.
Also I was wondering if I can add this battery to my Himo C20.
Aliexpress - 36V 20Ah E-Bike Battery 18650 Lithium ion Frog Batteries ... |
H: Two devices from a common power supply
I would like to supply two devices from a single power supply. The devices are connected to the power supply in parallel. Device1 uses a much higher current than device2. The power supply can safely handle the combined current draw. My question is if say device1 starts to dr... |
H: Electromagnetic door locks in series or parallel
I am planning to add two 12V electromagnetic door locks to a door. Should they be connected in series or parallel to the power supply? Or is it advised for each to have its own power supply?
The Power supply is a 24V power supply.
AI: If it's a 12V power supply, then... |
H: How to control ESP-05 power using Arduino (both are 3v3 devices)
I have ESP-05 connected to Arduino Pro Mini. Both are 3v3 devices. I need Arduino to power on/off ESP-05 device using GPIO when needed. Please suggest.
I tried to use N Mosfet but that did not work possibly because example is with different power su... |
H: Need a method for synchronization of galvanically separated microcontrollers
I would like to get some ideas for my problem. I have a HW which has a main processing unit (Beaglebone, host controller) which is connected to four galvanically seperated STM32 microcontrollers. All of the STM32 microcontrollers are doing... |
H: BAT60A diode allows reverse voltage
I have designed a board and it can be supplied by USB and/or D-Sub connector. The board gets the 5V from USB or another board via D-Sub connector.
I have placed 2 Schottky diodes to prevent reverse voltage between these 2 connectors in case of they are both connected.
This is the... |
H: How do I calculate the average voltage of this wave?
I need to calculate the average voltage of the wave below, the DC voltage is 120 V , the curve starts at 21.65 degrees and the peak voltage is 325.269 V. The solution is 221.3 V. This is from a uncontrolled full-wave bridge rectifier with RE load, the source is 2... |
H: ATTiny1616 writing the SUT fuse in SYSCFG1 with AVRDude Command Line
I want to write the SUT fuse in SYSCFG1 to be 0x0 for 0ms startup time as per page 40 of the datasheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1616-3216-DataSheet-DS40001997C.pdf
I am using the following command to look at the ATTin... |
H: BT136 inner resistance
I found two datasheets for the BT136 triac:
Datasheet one
Datasheet two
But those datasheets didn't mention the inner resistance of the triac (or I couldn't find it.)
What's the resistance between pin T1 and T2 of BT136 triac when the gate is activated?
Edit:
I found another datasheet which ... |
H: Is volume controlled through a potentiometer?
Eletronics newbie here.
I am building my first prototype (using an Arduino) that includes a volume knob. I want to know if volume is controlled by a potentiometer because I saw this video and it got me curious how a device like that can handle audio so easily.
So the qu... |
H: Shared bus in FPGA (arbiter + peripheral bus) [VHDL]
I am trying to implement shared bus in my fpga design. I am thinking about something similar to the microcontroller bus.
I see two possibilies:
Second option is easier to implement but if bus is wide it will be more resources used.
Something which is in my opini... |
H: How to run a circuit with both 5V and 3V3 supply voltage?
I'm currently designing a circuit requiring 3V3 (an ARM MCU) which should run on both 5V and 3V3 input.
Since the power requirements are fairly low, a linear voltage regulator should suffice.
I want to use L78L33 but I cannot find information regarding the v... |
H: Matching S22 with a metal plate at the output
So assume we have a highfrequency device which has a missmatch at S22. Some of my colleagues solder a little round metal plate, placed on top of the signalpath it self (shortly before the SMA Connector) to improve S22 by 5 to 10dB.
My question is, why is this improving... |
H: How to use analog mode GPIO pin(not ADC input channel) for ADC?
I want to use a GPIO pin which is configured to be "Analog Mode" for ADC.
I am working on STM32L073 series microcontroller. The pins with ADC input channels
are used already. So I need to choose another pin to use ADC.
I could not find any information... |
H: How can we measure the quality of a capacitor?
There are various brands of capacitors on the market. Made in China, made in Taiwan, Korean and Japan brands.
Although the values of the capacitors are the same (eg. 35 volts 2200 uf) some capacitors come out more robust and longer life.
How can I measure the diffe... |
H: Understanding PLL VCO Integrator Phase-shift
In many PLL phase loop theory discussions, it's often said that the VCO acts as an integrator and therefore has a 90 degree phase shift. I've seen derivations of the VCO transfer function and this image (taken from here) is particularly enlightening:
Here we see the in... |
H: Permeability Discrepancy of an Inductor
Background:
I bought a material 77 ferrite rod for a homemade inductor. The core was 0.5" in diameter and 7.5" long with a claimed initial permeability of 2000.
When I recieved it, I tested it out using 18 AWG wire that I wrapped around the ferrite core for the entire length.... |
H: circuit to detect chess clock toggle change to fire BT button
I was looking for simple circuit: (SamGibson's idea to add a 2nd reed switch proved possible, see update below.)
to detect transition to flat 0 V when player B's clock is running.
to detect transition to periodic 200 mV pulses when player A's clock is r... |
H: Why did my meter read 6 volts dc in the speaker output of a car radio?
While probing a "live" car stereo pins, I also probed the speaker output pins but left the meter in dc volts mode and got a reading of 6v, wich I think is odd, as I asume the output should be considered AC.
I want to know why would the meter sho... |
H: What are these female 2.54mm (0.1") crimp terminals?
So I but some crimping terminals to make my own custom cable connections for the first time today for an Arduino project I'm currently working on.
Comparing to some older ones I have from premade jumper wires I had lying around, I found that they are definitely n... |
H: can you please help me to identify this smd component marked M 412 727a?
Hi please help me identify this smd component marked M 412 727a thanx
AI: Micrel (now Microchip) optocoupler? |
H: KVL equations for this small signal model
I could figure out how the small signal pi model is obtained from the large signal model and below shows an example circuit where I also draw the pi model:
But from this point does KVL hold? How can we write the KVL equations? The change in small signal vin is not the same... |
H: Electromagnetic 7-segment flip display: H-Bridge alternatives?
I have an electromagnetic 7-segment flip display which has 28 electromagnets for 4 digits.
They run on 20V, have a 7.5W power rating and need alternate polarity applied to switch between the 'on' and 'off' states.
I tried using a Raspberry Pi with 14 x ... |
H: Could 48V arc across this small gap?
I have soldered two wires onto this Cree XHP 70.2 LED, tested it in a circuit, and everything works fine. I intend to wire four of these LEDs in series and drive them together at about 48V and 2.4A (12V each). My only concern is how close the solder is to the copper LED backpl... |
H: What is the use of the fourth leg, the one with igbt in series with the diode, in the infineon power module?
The circuit shown below is the schematic of infineon PIM module. I am specifically interested in FP15R12W1T4. From the schematic I could understand all elements other than the 4th leg which has an igbt in se... |
H: Requirements for NPN, PNP transistors
Is the following a correct understanding of what makes a NPN/PNP transistor turn on or off?
NPN (more common)
Must have voltage > ~0.7V on base
Must have (conventional) current flowing into collector (top)
PNP
Must have zero voltage on base
Must have (conventional) current f... |
H: Path of a signal traveling on a mismatched transmission line
I have a basic question about the path of a signal traveling on a transmission line with a short circuit as termination.
Suppose that this line is driven by another line (at left) with Zc = 50 Ohm characteristic impedance. The line in my scheme is matche... |
H: Visual example of PNP transistor
Following this question, Visual example of NPN transistor, is the following a correct understanding of a PNP transistor?
To be honest, I have no idea why the top of the transistor (where the current flows into) is called the Collector for an NPN transistor and an Emitter for a PNP ... |
H: Where is the correct place for a body pad of a TO220 linear regulator in Eagle
In my two-layer pcb design I have an LM317 with a TO220 package. I took the generic TO220 package from the default "linear" Eagle library which does not have a polygon copper pad under the body of the part. However, since the body is con... |
H: Non-sinusoidal waveforms: relationship (resistance, capacitance)\$\xrightarrow{\text{affects}}\$ (amplitude, frequency)
During the laboratory we have analyzed the following two non-sinusoidal generators:
square-wave generator
triangular-wave generator
Sadly we didn't have enough time to complete the last task... |
H: Find voltage across inductor in RL circuit
I have this circuit in wich I try to find the voltage across the inductor (VL) at t = 0+ and the switch OPENS at t = 0
simulate this circuit – Schematic created using CircuitLab
Here are my calculations below, but I can't seem to get a correct answer. Can anyone help me? ... |
H: Do I use this equation for a Friis law question
I am just puzzled as the question gives two gains.
The question is below
input receiver has a noise figure of 4db and a power gain of 5db. It is followed by a mixer stage of with a noise figure of 3.5db and a gain of 3db. what is the composite noise figure for the two... |
H: Unknown black component on PCB
This black component becomes very warm and I have a feeling it is broken since it becomes very hot compared to the other two similar ones.
Can't find any part number or anything.
AI: simulate this circuit – Schematic created using CircuitLab
The patent
The purpose of this ferrite Balu... |
H: Short circuit protection of a controller for flyback converter
I would like to have your opinions about this short circuit protection. Here is the schematic associated given into the datasheet.
And you can find into the same datasheet how their short circuit protection works.
Here are my questions:
1 - " When t... |
H: Leading edge blanking does not depends on primary leakage inductance?
Here are the following advices for designing the leading edge blanking of a flyback converter. There is also the schematic:
It tells us that there is reverse recovery current which occurs from the output rectifier diode, I suppose or from the ... |
H: Capacitor to discharge upon switch open
Update Please evaluate this third attempt:
This is my first electrical project, so please be gentle with me. I know very little about electronics.
I'm building a machine that has a crank that users pull. The ideal behavior is that when a user releases the crank from its lowe... |
H: Why is voltage drop independent of this 4 Ohm resistor?
I have this resistor which is connected to some battery (not very important). I don't understand why the total voltage is equal to the voltage drop over the 3 \$ \Omega \$ and 2 \$ \Omega \$ resistors. Why is it not dependent on the resistor in the middle wit... |
H: How does current flow in this circuit, and why?
I'm new to EE. I know this is a simple question, but I would like to know how the current flow in this circuit. My textbook says that the current does not pass through the capacitor, but I don't know why. Any help is appreciated, thanks!
AI: Figure 1. A classic capaci... |
H: Closed loop circuit vs open loop circuit can current flow?
So this has been bothering me. Lets say we have a circuit which looks like this below:
If the connection to ground is earth ground, and the positive side of the voltage source is connected so there is a potential difference over the resistor, would current... |
H: Transistor as a heater device and measured by LM35 temperature sensor?
The aim is to make a temperature control circuit using an Arduino Uno as a controller, an LM35 sensor as feedback to measure the actual temperature, a TIP31C transistor as actuator to control the power dissipated (heat.) I have a 12V,1A power su... |
H: How often are inductors used in electronics
I am a relative beginner at using electronics, and am tight on money for my first load of electronics that I am going to buy.
I was wondering if I should get some inductors now or wait for a bit later when I need them.
In other words: Are inductors used frequently enough ... |
H: Circuit for reversible motor controlled using relays
I am very new to electronics and drawing isn't my strength either, so please forgive the bad diagram. But I hope it makes sense.
I want to be able to control a motor using relays and be able to change the direction of the rotation. From what I know, the rotation... |
H: A two-pole system can never be unstable?
I was reading in some textbooks and places online that a single pole introduces a -90 degree phase shift and that in the phase plot, it never actually reaches -90, it goes asymtotic to it.
Similarly, for a two-pole system, it never reaches -180 degrees, just reaches very clo... |
H: Is this resistor routed correctly?
For a friend I'm trying to make a fuzz pedal and found this very flexible fuzz circuit, called "The Fuzz of 1000 Faces," at instructables, credits to Randofo.
However, since it's an old post, I ask the question here (since it's more generic).
Why is the 100 K resistor (in the red ... |
H: RLC equivalent model and Impedance Smith Chart
I have done some impedance measurements on an unknown 1 port device. I have measured its impedance at different frequencies (from 10 MHz to 600 MHz) and I have seen it on the normalized (on 50 Ohm) Impedance Smith Chart:
At Low frequencies we are at the short circuit... |
H: Differences between 2nd order low pass filters
I don’t know how to design filters, but I need a second order low pass filter. I searched them on the internet and found two schemes. One is Sallen-Key, and the other I don’t know what is called. Question: what is the difference and which is better to use? How is the f... |
H: Current Probe with 1mA precision
I've designed this circuit for a 1 mili amp precision current probe, what change should I apply to it?
AI: There's no spec of the wanted functionality, accuracy nor precision, only some contradictions can be shown.
There's a 100pF capacitor C1. Only sub-microsecond pulses get throug... |
H: What is the difference between F5AL250V and F5L250V fuses?
In the glass fuses' code F is for fast blown the second number is the current, but I do not know what is the difference between L an AL (if there is any).
Could someone explain this.
AI: They are the same 5A 250V fast acting low breaking capacity fuses (jus... |
H: Minimum g9 led current
I am trying to find out the minimum current of a LAP 220V 2.78W g9 led. Is there an IV curve available for this product? None of the data sheets I have found show any minimum current requirements or an IV curve.
I have carried out simple current experiments using a Variac and have recorded a... |
H: Why does writing 0 to IOSET (ARM7) has no effect?
I am learning ARM7-TDMI using NXP LPC2148.
While studying the reference manual, I came across these two functions - IOSET AND IOCLR , used to set and clear the port bits respectively,
As per the reference manual:
" This register controls the state of output pins in ... |
H: Using LVC logic instead of AHCT
I need to power a 5V LCD display from a 3.3V microcontroller. On my breadboard I used 74AHCT125 level shifters powered at 5V. This worked fine.
For the PCB version I have - mistakenly - ordered 74LVC125 chips. With a 5V power rail can I still use them (the data sheet seems to me amb... |
H: AC to DC power supply - earth ground capacitance on DC output
I have a mains to 60v DV power supply that I’m using for a project. Needless to say it managed to give me a bit of a shock. This surprised me as it’s supposed to be floating.
With no load the power supply seems to show a -60v potential to earth ground f... |
H: How does a microwave oven modulate its output power?
My microwave has multiple power settings, ranging from 500 watts to 1500 watts. My question is how is the power reduced/modulated?
I can think of a few options (but I don't know which one is correct/most common):
Is the microwave constantly switched on and off ... |
H: Why does my MIC4605 keep blowing up?
I'm trying do design a mini-PCB, replacable half-bridge for motor control applications. The primary application is to use it with my modular inverter/BLDC/BDC controller. The controller design assumes 6 signals going to the bridge: GND, OUT, Low Side EN (optional), PWM, Gate Dri... |
H: High torque low rpm BLDC Motor
I am creating follow focus system (motor with gears that moves camera lens ring).
Vast majority of such systems use low Kv high torque BLDC motors - similar to the ones used in gimbals. I think it is mostly because higher Kv motors require gearing to provide enough torque which introd... |
H: Why does this transistor circuit work?
In the following circuit, why does a certain amount of current flow into the transistor in the below circuit?
I can understand once the push-button switch is turned on, there would be current flowing through it:
But what does it flow in before then?
AI: The transistor is lik... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.