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H: How do I wire Solid State Relays to a linear actuator
Sorry for the dumb question, but I only know enough to get myself in trouble.. I've searched through previous questions and haven't found an answer that dumbs it down enough for me.
I'm trying to activate a 12vDC 12amp linear actuator (https://www.progressivea... |
H: DALI specification: help to understand the physical layer schematic
I am trying to understand an NXP circuit that has implemented the physical layer of the DALI specification. In particular, it is DALI master hardware. For the transmission (page 4), it says exactly:
For high signals of DALI1_TX, Optocoupler OK2 c... |
H: How to use this power supply?
I've needed to use a second power supply and been given this one by a friend, and I don't really understand how to use it fully. I also have a couple basic questions on use.
It has two screens, and I only understand the right half, which is the output current and voltage. Can anyone e... |
H: How to do with a capacitor that i can't buy
I would like to buy only 4 capacitors like this:
750pF
1600VDC
500VAC
5% tolerance
I only find it on mouser but MOQ is 2'000; almost same as me !
How I can deal with that? Should I try to find 2 capaciters totalizing 750pF and wire them in parallel ?
Thank you
AI: Try loo... |
H: How can I record video with single camera module of smartphones?
I want to record video apart from my smartphone(Let's say Samsung Galaxy S3) taking out it's camera module.I think it is possible because camera's microchip comes with itself.I mean I will connect camera to micro SD and I will give wanted DC current f... |
H: SR latch timing diagram or waveform with delay, help!
I'm having trouble solving these two problems (my solution and general solution showed):
What I did was follow the truth table and based on the combination on the graph draw the appropriate state with a delay of 10ns:
PLEASE HELP ME UNDERSTAND HOW TO DO IT AN... |
H: Drive 6Vdc relay ( with coil resistance 68ohms ) with 20mA current source
I have a current source of 4-20mA and I need this to drive a 6Vdc relay.
I could not use passive Current to Voltage converter since the relay coil have resistance of 68 ohms and the voltage drops at output if the relay is connected.
Is there... |
H: Can GaN FETs be driven directly by logic level signals?
I've gotten interested in using GaN FETs for their combination of fast switching speed and very low on-state resistance. Most of the eval boards (for example by EPC) use GaN driver chips such as UCC27611 and LM5113 which regulate the gate voltage to 5V and cl... |
H: raspberry pi 3.3 to 5v level shift for led rgb strip
I'm working on my first electronics project. Basically I'm trying to control an rgb led strip from a raspberry pi's gpio pins. I'm trying to convert the raspberry pi's 3.3v up to the 5v required for the led strip. I bought these level converters https://www.amazo... |
H: Why use a "load switch" and not just one transistor as a switch
I am trying to understand the advantage of using a 'load switch" for switching applications.
The load switch (like the one below), has two transistors to do the job. Why can't I just use one transistor (bjt/fet) for doing the same thing?
AI: You could ... |
H: iPhone not charging when plugged last
The power extension has two USB slots. I noticed that when a Xiaomi phone is plugged first, and then iPhone next, the iPhone doesn't charge. However, if it's done in reverse, iPhone first, Xiaomi second, the iPhone charges and so is the Xiaomi phone.
Why plugging in a particula... |
H: What does solder additive do?
I grew up as a boy doing soldering kits in the 80s. I wanted to do the same for my daughter so bought a soldering iron online.
It came with a box of orange resin with Chinese writing on it. I'd never seen something like this to do with soldering. Running it through Google translate co... |
H: DALI schematic: help to analize reception circuit and limited current supply
I am trying to understand how this schematic works. It is a physical layer implementation of the DALI specification. The schematic is in this document
(page 11). I have mainly two questions:
In reception mode: when the bus is idle (volta... |
H: Efficiently limit current to LED without power loss
Let's assume I have 3 LEDs which have forward voltage of 3.3 V and current rating is 300 mA. All the LEDs are in series and I have a power supply of 12 V. when I series a resistor to limit current it draws much power.
Calculations:
Voltage through LEDs =\$3.3v*3=9... |
H: Questions about SMPS Toroid winding
I'm making a simple SMPS to create multiple isolated outputs to audio effects circuits.
I need to make a toroid pulse transformer which has one primary and
at least 10 secondaries.
These secondaries will be used in pairs to make 5 positive and negative outputs.
I've never wound m... |
H: Frequency response of state variable filters
Could someone explain the difference between the following responses of a state variable filter? It looks as though the band pass response is approximately 3dB lower in the second image.
Assuming a state variable filter:
I have seen frequency responses like this:
and ... |
H: OrCAD PCB Designer Transistor Footprint
i want to change the position of the transistor pins (2N3904 & 2N3906, Q3,Q4,Q5 and Q7), on the first image is what i got so far (inside green oval area), the footprints are TO92.
i want to change the position of the transistor pins, something like its shown on the last imag... |
H: Should a frequency-controlled motor use a circuit breaker with a B or C trip characteristic?
In our company, a discussion is raging on whether a motor with a frequency controller should be protected with an automatic circuit breaker with B or C characteristic.
The B-camp's argument is that, because of frequency co... |
H: Why is there a maximum time for length of write pulse to write on an EEPROM?
I am still just learning about electronics on my own, so please bear with me.
The EEPROMs that I have come across (for example this one where the t_wp max is 1000 ns.) all have a time limit for the write pulse (I think this is called the ... |
H: Transfer function of filter
I've got a trouble with this filter:
I tried calculating transfer function from four-pole matrix, but can't handle it :(
Any help much appreciated.
That shaggy drawed element near U1 source is coil. Sorry for my drawing.
What I've done so far (I think it is wrong):
AI: This is the probl... |
H: How can we provide a stable reference voltage to a voltage regulator if we don't have a stable source to begin with?
In voltage regulator circuits i always see a "reference voltage", that is supposed to be used to tune the regulator to the voltage we want to regulate the output to.
But since we don't have a regulat... |
H: Why there is difference between image size and video resolution of a specific camera?
I was searching to buy a camera, but I saw in specs they wrote:
2MP(full hd) video recording
5MP image size
Why the vido size is 2MP but image size is 5MP? How they calculate these numbers?
If I had a camera that could shooting i... |
H: FPGA Internal Timing constraint failing
I'm currently trying to implement an IP-Core on a Cyclone V 5CSEBA6U23I7 FPGA-HPS System using Altera Quartus II and TimeQuest Analyzer.
The Verilog code pasted below produces a timing problem, namely the assignment fifo_wdata_289[255:0] <= {fifo_out,fifo_wdata_289[255:16]};,... |
H: smart card clocking using NXP
In my current project, I'm trying to implement a smart card reader using LPC1788 which has a built-in smart card interface. Smart cards use the ISO7816-3 standard to communicate with the outside world. Smart cards need clocks which must be between 1MHz to 5MHz. This clock will be used ... |
H: Is a stage box with an iron grid safe using this way?
See also my previous question:
How should I bypass switches
Where I made a circuit directly by mains, and as proposal by very useful comments to use a separate 'control' circuit at 9 or 12V.
However, according to this video:
How to Build On-Stage Light Boxes fo... |
H: What is the boxy plastic housing around spade connectors called?
This spade connector is used to connect to 12V SLA batteries, and I believe it's the F2 variant. However it has a nice plastic shroud around it which makes it easier to remove from the batteries and since it's fitted after the crimp it doesn't get da... |
H: Busted Capacitor
I have a motherboard with a capacitor busted. When I put the CMOS battery on it, it randomly reboots after a couple of minutes. The busted Capacitor has a rating of 6.3V 3300uf 150*c. But the problem is I have only a 16v capacitor woth the same capacitance but I know it will have ESR issues. But ch... |
H: LPC1343 double pin functions
I was looking to create a LPC1343 development board, but I noticed something odd.
If you look at the pinout for this MCU you can see double functions for some pins. This is common, so you can program a pin to use for a particular function. But here is the weird thing. Pin 3 on the LPC13... |
H: ADC Burst mode in LPC2119 not working
I have been trying to work with ADC using ARM 7 LPC 2119 in burst mode however this functionality is not working.
My code is as follows:
ADCR = 0X0121090F; // Start A/D Conversion
//Wait for the conversion to complete
while(!(ADDR & 0x80000000));
... |
H: Current amplifier with Mosfet and Op-Amp: Output resistance
In the following circuit, why is \$R_o\$ given by:
\$R_o=(R_1//R_2)+r_{o2}+g_m .r_{o2}.(R_1//R_2)\$ ?
I dont understand the \$g_m .r_{o2}.(R_1//R_2)\$ parcel
AI: The output resistance is increased beyond the observed value of (ro2+R1||R2) because of the ne... |
H: DC motor back emf and supply voltage
In this question the solution manual takes Eb as 250v and solve it to get the torque. How's that possible ? How can one takes the supply voltage as Eb? If there's something i don't or i didn't get please enlighten me.
The given solution :
Pd = Te*Wr
Eb=Z * P * Phi * N/(60 * 20... |
H: (how) can I use 250v fuse in a 9v circuit?
I bought a nice big assorted set of fuses ranging .1A to 20A. All of them have 250V on them.
The question is can I use them in circuits with 3, 6 9 or 12 V?
If yes, does lower voltage changes the rating amp of the fuse?
AI: The design of a fuse conductor material gives ri... |
H: Is it possible that the BJT will work in active mode even if emitter base junction is reverse baised?
I was going through voltage divider bias configuration of BJT and then i encountered two problems:-
The above two problems are nearly same except that the emitter terminal is grounded in case of (b) and baised in ... |
H: Best way to pair a DC-DC boost converter and a MOSFET to compensate for MOSFET voltage drop
I'm building a PWM fan controller, and would like to use a DC-DC Boost converter to compensate the voltage drop across the MOSFET.
What I would like to get an opinion on is if it's more efficient to boost the voltage before ... |
H: Why do push button telephones use dual-tone for signalling?
Here is a related information from wikipedia:
For touchtone service, the signal is a dual-tone multi-frequency
signaling tone consisting of two simultaneous pure tone sinusoidal
frequencies.
Above shows that if one pushes number 1 he sends the mix o... |
H: How to solder an SMD component with a "pad" on the bottom?
I am getting a PCB manufactured for a project that I am working on. One of the parts, the A4950 motor driver (datasheet), has a "pad" on the bottom, which is meant to be soldered to GND of the PCB for thermal dissipation. I am only ordering a small quantity... |
H: Cheap PWM Charge controller not charging the battery
I recently got myself a CMG-2430 PWM charge controller(pretty cheap I know) and a 12v deep cycle battery. The problem is that the charge controller doesn't charge the battery when I connect the solar panel. ....I know that is a cheap solar charge controller but I... |
H: How to power STM32F103C8T6 in a 'real' project?
I'm sorry for this probably very generic question, but I cannot find a good answer.
I have several STM32(F103C8T6, a.k.a. Blue Pill), which I now power via a ST Link (giving 5V via USB).
The STM32 itself works on 3.3V.
However, I want to use later not USB power, since... |
H: eagle library--updated footprint wont show in board
I initially created a part in an eagle library, but now I need to change the package layout. I have already put the initial part in an eagle schematic, so removing/re-inserting it is not an option. So anyway, I opened the library editor up and edited the part's pa... |
H: Help identifying component on cisco switch SGD110D-08
first of all thanks for taking time helping me with this issue.
TL;DR; Identify the blew up component on the picture and win!
I've by mistake done a very short but effective connection in reverse polarity to my cisco switch. Apparently only one component blew up... |
H: USB-C Power Delivery with a buck converter
Following on from my previous question: The project I'm designing requires a peak current of 5V @ 6A. The average current draw will be more like 2A.
The reason I'm looking into USB-C is that I want a connector that is low-profile, reversible and I wish to use the power de... |
H: How to null op-amp offset in current source?
I have a current source circuit with an op amp and pass transistor. The simplified schematic is this:
simulate this circuit – Schematic created using CircuitLab
I would like the output to be adjustable over a pretty wide dynamic range, let's say 4-6 decades (amperes to... |
H: Something strange with my multitester
I have a multi-tester. And its model name is J0411A. And it looks like thisYou might see that this multi-tester includes a resistor tester. When I set the tester to x1 of Ohm section and connect + to - directly, I get about 2.6 Ohm. When I set the tester to x10(other things are... |
H: Can I use an arduino as a LCD controller?
I saw this video where a person used a graphical LCD as a very rudimentary monitor for his computer using an Arduino... I was wondering whether it is possible to use an Arduino as a controller board for larger, proper LCDs (from laptops for example). If the Arduino doesn't ... |
H: Can the ARM processor be switched to unprivileged mode inside handler mode?
In the ARM documentation it is stated that:
The processor supports two operation modes, Thread mode and Handler
mode. Thread mode is entered on reset and normally on return from an
exception. When in Thread mode, code can be executed a... |
H: Deriving expressions from transfer function of state variable filter?
I have been trying to design a state variable filter based on a block diagram provided. The transfer function which I have is of the form:
$$\frac{K_1K_2}{s^2 + K_1s + K_1K_2}$$
I need to obtain and derive expressions for the natural frequency an... |
H: How do I read these blasted five-band resistors?
I have 500 resistors designed like this:
That's brown, red, black, black, brown. Roughly equal spacing between all bands. 120 ohms, right? No. This is a 10k resistor: brown, black, black, red, brown.
Why would they label it this way? They could easily have labeled ... |
H: Using a digital potentiometer in a voltage divider
I'm using an MCP3008 ADC and an MCP4131-103 (10k) digital potentiometer to try and create a sort of "adjustable voltage divider."
For the project, the resistance I'm measuring will vary, and I hoped to use the MCP4131 to adjust my reference resistor on the fly. Nam... |
H: Calculate resistance for high amperage LEDs for control with Arduino
I'm trying to control my LED strip with my Arduino, so I decided to buy a FET. Now I want to learn why and what kind of resistance should be put between the gate and the Arduino.
I have a long (1560 cm) LED strip connected (in parallel). The strip... |
H: Dynamo connected to a motor question
Brief explanation: From the figure above, (B) is an electrical motor and (A) is a Dynamo, the red mark is a rotating rod connected to the dynamo. The dynamo is supplying power to the motor (B), hence the motor is getting more power which in turn makes the rod rotates faster.
Is... |
H: Air Purifier Circuit Mod Help
I have an air purifier I would like to modify the PCB to an always on state at high setting when plugged in. This would allow me to control the device with and Amazon Echo compatible smart plug.
Important switches on the board
SW2 - Power on the unit which is initially in an off state... |
H: Computer won't post / Beep unless Unplugged for a few hours
I'm experiencing this issue for almost a year now. It is slowly getting worse. My motherboard is Gigabyte GA-Z77X-D3H and my PSU is Corsair CX600. The source of the problem most likely has to do with either one of these two components. I have built this PC... |
H: Missing component on the Usb to RS485 converter
I have a Usb to RS485 converter that was dead on arrival. I opened it up to see if I could fix it to find out that it was missing a component on the top left corner. This is a very common converter. Can someone who has the same device tell me what the missing componen... |
H: What is the advantage of an advanced battery charger?
Since my old, dirt cheap battery charger broke down, I disassembled it and was surprised not to find any integrated circuit in it:
Obviously, I'm now looking for a replacement. Now, there are advanced battery chargers which advertise:
... provide longer lasti... |
H: Non blocking delay for state machines
What is the best way to implement a non blocking delay for a state machine for each state?
So far, the best I found is something like that:
static uint8_t state = STATE_ONE;
if (state == STATE_ONE)
{
static uint64_t time_value_ms = (uint64_t)0;
if (time_value_ms == (uint6... |
H: How does this transformerless 5V power supply work?
I recently took apart a crock-pot cooker that stopped working correctly.
It had two boards:
One that dealt with the high-voltage for controlling output to the heating element
The other had a 4-bit microcontroller and a few buttons/LEDs.
I was surprised to see ... |
H: Altium Designer 16 - CurrentDate Special String Format
In previous projects, I used the CurrentDate special string, in the format YYYY-MM-DD (see the image below).
Opening the same project on a different installation of Altium, the format has been automatically changed to MM/DD/YYYY. Is there a way to change this ... |
H: What converter to use?
I am going to build a stage box, and I need 5V for that (to add some logic, maybe even later an STM32).
I also need mains (220V) for a 12W RGBW LED PAR light.
At first I thought to put in the box a 'wall socket' with two 220V plugs, but since the 12W needs to be switched by a relay, only for ... |
H: Relationship between input voltage and output voltage for an active filter
I'd like to know if I understood correctly the relationship between input voltage and output voltage for an active filter.
I study in French, so please understand if my glossary doesn't accord with English ones.
Say, [Av] is the coefficient ... |
H: Boost converter is acting as a capacitor
I've just bought two Xl6009 Boost converters and both are showing the same problem. When I connect a power source to the input terminals and tried to measure their output it shows 1 on the left side of the multimeter (meaning infinite resistance ) then when I take out the po... |
H: Never use Ni-MH batteries in a toy?
This is a simple battery powered toy basically just a DC motor.
Never use Ni-MH Batteries
Why would Tamiya 4WD JR prohibite rechargable Ni-MH batteries? As I understand it, the voltage is a bit lower, but beyond potentially lesser performance, I see no danger. Thoughts?
AI: This ... |
H: Noise issues Atmega power line
I have designed a PCB that has a Atemga328 chip, connected to 6 logic level MosFETs via the PWM lines of the chip. The board is primarily designed to run long lines of led strips. Turning them on, fading etc.
The board has been thoroughly tested, and the only issue discovered is that ... |
H: Cannot change to front copper layer in KiCAD
I am learning to design PCB using KiCAD. I followed a tutorial on youtube. I got stuck at changing the layer of the PCB. From the video, the layers can be interchange by pressing page up (front copper) or page down (back copper). My filled zone layer is b.cu and net is ... |
H: Writing SPI Flash on Mac
I am not entirely sure whether this question would be on-topic here, but I am stuck on this issue unable to find any relevant answers online in any other sites.
I am working on a pet project which includes using SPI NOR (I am going with 16MB Winbond W25Q128 SOIC-8 chip). This chip will be u... |
H: Clip type for in-system programming (SOIC8 vs DIP8)
Updated:
What clip can I use to connect to this [specsheet] SPI flash chip in a DIP8 package?
note: this picture is of a motherboard that belongs to someone else, but mine has the same manufacturer, model-family, and Winbond 25Q64FVAIG. Only the third line (date... |
H: Diode breakdown
I read in the book, "Microelectronic Circuits" that the breakdown of a pn junction is not a destructive phenomenon given that the breakdown current is limited to a safe value by an external circuit.
What does it imply by a safe value?
How it is ensured by an external circuit that the safe value is... |
H: What is the RS-485 line wire series resistance limitations?
Just tried to simulate the communication line with the series resistance in it:
As you can see even at 1 MBPS the signal at the "receiver" is fairly good. I'm pretty sure that this will be OK to receive the signal.
The reason I tried to think about the se... |
H: Using one pot to control simultaneously different parameters
First, please forgive my lack of knowledge, as i'm a beginner in the matter.
I'm looking for a way to control with one pot different parameters. In context, i'm trying to control a Filter Cutoff on two different channels. Later on i'll add options for mor... |
H: Finding cable impedance, to determine RS485 line termination
We have some Belden 6341PC cable which will be used with some RS-485 communications equipment, which of I'm learning will need line terminators. I'm told the resistor values needed should match the characteristic impedance of the cable. The problem is I'... |
H: how does SSD non-volatile storage work
Is it because of the charge present in floating gate that SSDs are able to store information without power? If so, how long would the charge remain in floating gate without electricity?
AI: Usually they use a battery and refresh the memory with a controller on technologies tha... |
H: Power supplies in series, can you ground the middle leg?
Let's assume I have two 15V DC power supplies. These power supplies are allowed to be connected in series (per the user's manual).
I have a device that requires a signal from +15V to -15V (motor driver circuit).
Typically, I would put both my power supplies i... |
H: How to measure small, spiky amounts of current?
Let's assume I have a microcontroller with some amount of peripherals attached and would like to be able to make a reasonable estimate of battery life. Because I might have it sleep at times, and various peripherals would be in differing states, my current consumptio... |
H: Detect open AC circuit and fire alarm
I’m a noob, would appreciate any help with the following:
THE PROBLEM
We live on a mountain in North Carolina. When the temperature drops well below freezing, the well head freezes resulting in loss of water and broken pipes. I installed pipe heater tape which worked well for s... |
H: Understanding constant current circuit
I've been learning about different constant current circuit designs and just recently stumbled upon this one. All I know is that the highlighted resistor is the load resistor and when varied, like a potentiometer, the current running through the load resistor stays the same. ... |
H: SDRAM structure for Cortex-M7
I'm looking into designing a custom board based on a Microchip / ATMEL SAM S70 or STM32F7 / STM32H7. The SAMS S70 appears to be the cheapest option and offers roughly the same as the ST competitors.
I'm now trying to figure out how much SDRAM I can attach to these MCUs.
The datasheet ... |
H: Electromagnet Wire/Voltage/Magnets?
I have some questions about my project. I want to make a big electromagnet, the size is about:
Outer Ring:
50-70cm Height
35cm Diameter
Inner Ring (The Movement):
32cm Diameter
Now:
is it OK to use 1mm copper wire?
How much voltage do I need for a nice movement?
Must the in... |
H: How to drive optoisolator from Mains
Most of the circuits that I have seen, MOC3021 or similar opto-isolator is driven from Micro-controller. I want to do the opposite - Can I drive the opto-isolator from mains supply and use the other side as INPUT to Arduino.
AI: This circuit is fairly commonly used: -
Note the... |
H: 4-terminal shunt resistor
What is the importance of a 4-terminal shunt resistor? What is real purpose behind using two seperate terminal for the voltage measurement across the shunt resistor?
AI: Take a look at this. It shows two terminals as the main current flow (thick tracks) and uses 2 more terminals for measur... |
H: Internal resistance of a battery
I am trying to figure out where I went wrong on the following problem:
simulate this circuit – Schematic created using CircuitLab
The two batteries are identical, and each has an open-circuit voltage of 1.5V.
The lamp has a resistance of 5\$\Omega\$ when lit. With the switch cl... |
H: Difference between 0-18V and -9V - +9V
What is the principle of the difference between a supply which provides 0-18V and +9V and -9V?
If I am using a circuit which takes a +/-9V power supply, and instead start powering it with 2 9v batteries, is there a fundamental difference in the supply, or is it just a verbal o... |
H: Vce saturation voltage confusion
I finally finished my first transistor circuit and looks as follows:
For the LED to light up properly, I assumed a forward current of 70mA and a voltage drop of 1.3V. The datasheet of the PN2222A states that at 70mA collector current, the saturation voltage \$V_{CE}\$ will be about... |
H: VHDL: Demultiplexing a signal to one of many outputs while driving unused outputs to '0'
I'm attempting to create synthesisable VHDL that will demultiplex a one-bit continuous signal stream to one of many outputs. The outputs that aren't being sent this stream should be set to '0'. See image below for an idea of wh... |
H: PIC16F1936 Multiple ADC channel readings
I am programming a PIC16F1934 and using it's two ADC channels namely AN0 and AN1.
I take the maximum out of a bunch of few readings for the AN0 reading and then just one sample for AN1.
Here is my code:
ADCON0 = 0b00000001; // Source: AN0, Enable ADC
f... |
H: What other units can influence the way a wire glows than watt?
I have a vape device with a mod that lets me configure the power I want to operate it with and also as an additional setting that is called vape strength which can be set to soft/medium/hard.
When operating it on soft it generates just medium amount of... |
H: Power factor basics
I am confused about how the power factor is defined for an unbalanced 3-phase load?
Wouldn't it make much more sense to ask for a particular phase of the unbalanced 3-phase load?
AI: What would make the most sense would be to determine the power factor for each phase of an unbalanced 3-phase loa... |
H: Why Duracell Security MN21 12 V 23A Alkaline Battery cannot provide 12v to Computer Fan 12 V 0.16A
Fan spinning only at 5V (~600 RPM). Why this happened? The fan should spin at full speed.
AI: Duracell MN21 battery : (datasheet available here) : "typical impedance : 22 ohms".
Voltage lost in battery at fan's rated ... |
H: LED bar graph driver with 12 pins?
I wanted to use a 12 LED bar graph with a LED bar graph driver but the the driver I know (LM3914) supports only 10 LEDs. Is there a similar driver IC with more out pins?
The purpose is to use the bar graph as a battery voltmeter. DIP package preferred.
AI: I wasn't able to find a ... |
H: Designing dimmer circuit for main
I saw a dimmer on instructables and try to create circuit and pcb for it. However the it looks nice and probably will work but I'm not confident the reliability on long run.
So my question would be if this design violates some safety rules or not.
Yes I know the resistors don't... |
H: Low voltage controlled open drain circuit
I have a power regulator with an output enable that can be used to shut the regulator off without actually unhooking it. I am trying to figure out how to control that using a GPIO port of a Jetson TX2 (1.8V logic).
The manufacturer of the regulator says that I will not be ... |
H: Transfer function of an amplifier
Can someone please help me find the transfer function of this circuit.
$$
\frac{V_0(s)}{V_i(s)}= \dots
$$
simulate this circuit – Schematic created using CircuitLab
This is what I have done so far.
$$
I_{R1}+I_{R3}=I_{R2}+I_{C1}
$$
$$
I_{R2}+I_{C2}=0
$$
$$
I_{R3}=I_{C2}
$$
By subs... |
H: Using MCP73213 for charging two Lithium ion batteries connected in series
My device has some loads which use 5V. I can't use a single Li-ion Battery as it'll give only 3.7V. So I've decided to connect the batteries in series to get 7.4V power supply. Since my wall adapter gives 12V output, I'm planning to use MCP73... |
H: Help me understand voltage X
I am trying to understand an explanation written here: http://people.ucalgary.ca/~aknigh/vsd/ssim/vsi/co.html
As far as I understand:
voltage V(A) is line 1 voltage
voltage V(B) is line 2 voltage
... but what/where is voltage V(X) ... or V(X) at time t? I would like to understand the ... |
H: Using a 120W inverter with a 180W brick
For some testing at my company, we attach the product to a small plane and collect data with a laptop. The product itself is run off a small motorcycle battery and, last time we flew, our laptop battery died. I checked out the specs on the power supply and it was listed as 18... |
H: How to determine voltage across LEDs in a circuit?
I simulated a basic circuit in Orcad but I don't know how it found voltages(6.08 V and 3.04 V) on the nodes? How do I calculate those voltages mathematically? I am attaching three image files of schematics and values.
NOTE: Current value in circuit is 23.92mA acco... |
H: tri-rail power supply from cheap buck converters
I'm looking to build a 3 rail regulated supply (+5v, +-12v) and I've got a bunch of cheap but functional buck converts from aliexpress. I'm wondering if I can run these off a single AC-DC converter (wall wart, etc) and get a common-ground 3 rail supply from this?
I'm... |
H: Are there any special internal Ethernet connectors other than RJ45?
I am working on the board that suppose to have 1 GbE port (10/100/1000BASE-T). Looking at connectors all I seem to find is standard RJ45 connector.
However in my design the board itself is not directly exposed to the outside, there is a backplane w... |
H: Measure picofarad capacitances accurately
I need to measure or sense capacitance from 0 pF to 5pF, with an accuracy of 0.1pF or better. I know capacitance to digital convert chips claim to do that, but is there a simpler/easier way to breadboard a circuit to measure these ultra-low capacitances?
I have a small conc... |
H: Discharge of capacitor bellow 0.5V
I have a conundrum that I am trying to solve and am afraid I am stuck. Could anyone share some insight please?
My circuit is displayed on image above. 5V (5Vsw) and 3.3V (3V3sw) are used as supply voltages. When Vkill is triggered, entire circuit switches off. However, dependin... |
H: Is there a threshold voltage below which batteries are definetly dead and has to be recycled?
I have a particular case, where I purchased a brand new LiIon battery for an iPhone SE that showed 3.82 V in the beginning. I connected the battery to the circuit and after an hour or so, it showed 2.7 V. Then I disconnect... |
H: optimize peltier element cooling
I am currently playing around with this Thermoelectric Peltier Cooler Setup:
I have read that it's possible to cool these elements down to more than -20°.
However, I got the elements for cooling an aluminum pipe, so I glued both onto the pipe to cool it down.
Its already cooling t... |
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