All Questions
195,273
questions
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Proper DC supply vs batteries
For the current limiter circuit(using voltage regulator), proper DC supply matches the simulation results. However, when a battery of equal supply voltage is connected, the circuit goes haywire i.e. ...
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0
answers
13
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Clarification on Diode Recovery Times and Conduction State
I have a diode in my circuit with reverse voltage of 100V and forward voltage of 2V.
It experiences a reverse voltage of 100V and immediately the voltage changes to 10V in forward direction so it ...
0
votes
1
answer
18
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Multimeter Range and Resolution
I'm confused as to how my multimeter takes reading, especially since its not autorange multimeter, i have to switch to the desired range to carry out measurements. Unfortunately, the resolution part ...
- 339
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votes
1
answer
16
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AM-Receiver circuit, problems with saturation?
I have a questions about this specific circuit. I marked the potential-point I have "problems" with. I think there will be saturation in this point at some time. This point doesn't look to ...
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votes
2
answers
34
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converting a 100V 900W AC electric kettle into 230V 1000W AC kettle
I bought this 100V 900W 50-60Hz AC kettle I really like in Japan, unaware that the power supply was different there than in my country (France, 230V 50Hz).
I tried it once with an adaptor on my ...
- 101
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0
answers
41
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Is my basic coil gun schematic correctly wired?
Recently, I came up with the idea of integrating a coil gun into a marble machine to accelerate an iron marble. I've done a fair bit of research into other people's projects, and ended up mixing what ...
- 11
1
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0
answers
17
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STM32IDE & DC Motor - Tracking Motor rotation
Is there a way for a microcontroller (STM32) to track DC motor rotation?
Currently in class supposed to connect a DC motor of our choosing to a microcontroller, rotate it by 5 degrees and track the ...
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31
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Trying to get an identification of an smd component marked only with an "A", on a receiver board
I need help identifying the component marked only with an "A" in the picture. I think it may be a fuse?
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-2
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22
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What happens if two wires intersect [closed]
I'm pretty sure electric currents don't interact like this but if I were to make a NOT gate, with a wire, where one point is where current comes from and the other point be an output and the wire is ...
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-2
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0
answers
16
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Help needed Creating a truth table and a logic circuit using a statement given
i have gotten this question in my assignment, i'm quite confused about this and don't know where and how to start doing it, any help is appreciated
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answers
28
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Help identifying the fuse used inside a Parkside 20V lithium-ion power tool battery
I blew the fuse inside my Parkside power tool 20 V 4 Ah battery and was wanting to fix it.
There is a guy just soldering the broken circular fuse https://youtu.be/A6LYNa3-n90?t=171 but I want to do it ...
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votes
2
answers
27
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AC and DC inputs to a Power Supply
I am studying about power supplies and I need some help with the following. I have a power supply with a 12 V DC output to power the lower power controller electronics. This power supply has two ...
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0
answers
26
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Closed Loop Control of BLDC Motor using STM32
I am working on 6-step commutation control of BLDC Motor. For this, I am using the values of Hall Sensors embedded inside the motor as feedback to determine the sector and find a switching sequence ...
- 1
0
votes
1
answer
25
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Using block diagram reduction rules, convert the block diagram to a simple loop and determine the transfer function
I don't know how how to reduce after the branch point next to H1 from which it is connected to 2 summation points.
- 1
0
votes
0
answers
12
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Android magnetometer calibration algorithm
I am trying to find the Android magnetometer calibration algorithm but everything is hidden. Is there any code is available for Android?
Magnetometer calibration research paper.
Android Document
...
1
vote
1
answer
40
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Circuit analysis of a halfwave rectifier
I want to verify whether my calculations are correct. Additionally, there are two questions related to this circuit: 'What is the purpose of R1 and R2 in the given circuit?' and 'What is the intended ...
1
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2
answers
51
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Practical example of controlled voltage and current sources
In text books some controlled or dependent voltage and current sources are shown. What are they really? Can someone explain them with real examples?
- 1,120
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18
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Ideal diode used with 2 batteries experiencing low voltage cutout
I have a mobility scooter that I upgraded the controller on. It is a 1800 watt controller. I am using two 48V 10ah Lithium batteries in parallel with 50 amp ideal diodes ( https://www.amazon.ca/Anti-...
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25
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How to connect cable shield when receiver side powers signal source?
I have element 'A', the receiver, connected to earth, which powers modules 'B' and 'C', the signal sources, unconnected to earth. 'B' sends a differential line signal, and 'C' sends an analog signal. ...
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0
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0
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37
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Need an alarm circuit patent NZ 739314 using Parasitic oscillation
I am the owner/inventor patent of NZ738314 which produces a parasitic oscillation.
This oscillation is controlled by the resonance of an object.
The resonance can be related to composition,liquid ...
- 9
1
vote
1
answer
18
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For DDR4 and DDR5, is tCCD_l timing to be obeyed for accesses in a single row as well?
So I have been trying to learn about DDR4 and DDR5 memories, and it seems that the Column-to-Column delay values (in clock cycles) are different depending on whether consecutive accesses are inter-...
- 325
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2
answers
29
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Replace One Centre-Tapped Resistor with Two Resistors
I have just started research and design on a small guitar tube amp and have hit the first of what is probably many uncertainties. The idea is to reuse the transformers, 7C5 power tube and 7Y4 ...
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4
answers
60
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Single stage MOSFET Amplifier with terrible gain
I'm designing a single stage MOSFET amp for use with a 10k ohm load (R3) and I'm getting abysmal gain. How should I change the values of my biasing resistors?
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1
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2
answers
33
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How to Drive a 50uA Panel Meter with a PLC Running 24v Inverted PWM Signal
Full disclosure, I am not an engineer of any kind. Just an electronics enthusiast.
I have a Barth 850 micro PLC that needs to operate at 24v, and has one PWM output. I also have a 50uA panel meter ...
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1
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0
answers
15
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How to place decoupling capacitor in esp32 developer kit v1?
I am using esp32 fill the bottle based on user input quantity. I have to on/off pump 12v 4amp and I have to control flow sensor. I facing issues in flow sensor reading while pump on. The electric ...
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0
answers
25
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How to make a recent laptop touchpad work on PC with an external PS/2 USB adapter
I want to make a laptop touchpad work individually with an USB adapter, but failed on a recent Thinkpad T470 touchpad part.
Some articles on the internet said they succeeded connecting the touchpad ...
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-3
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0
answers
14
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From the image below Provide the nodal equations for the circuit. Solve for the nodal voltage V1. The node connected to R1What is the nodal voltage V2 [closed]
From the image below Provide the nodal equations for the circuit. Solve for the nodal voltage V1. The node connected to R1.What is the nodal voltage V2. This is the node between R2, R3, R4, and the ...
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1
answer
27
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How to Get Started with Triacs
I'm interested in building a solid state relay module at home using a triac.
I know the safety risks associated with this project. I'm also aware of the cheap SSR modules capable of the same things. ...
4
votes
0
answers
32
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Attempting to patch the "G75 Bug" on a Gerber Level
Context
I am currently looking for alternative PCB manufacturers for my company and have sent Gerber files to some (Chinese) companies.
These Gerber files have already been used in the past by various ...
- 2,713
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votes
1
answer
28
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What is a solution to handle multiple same capacity lipo cells in parallel?
It seems that BMS's are for batteries in series...
If I have 3 x 1200mAh lipo cells to get pretty much a large 3600mAh 1S pack...
I believe I know that I can't just parallel wire single-cell BMS's ...
0
votes
2
answers
45
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Calculation of equivalent resistance
I need to calculate the equivalent resistor between knots A and B to then use it in Thevenin Generator; it says the result should be (R // Zl) + (R // R) however I don't quite get why that's the case.
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2
answers
39
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Improving MOSFET switching timings (push-pull)
Based on my previous question here, as suggested I'm using a push-pull driver circuit to control a MOSFET gate.
this is the circuit:
And this is a simulation result:
Vertical Divisions are 1 V, ...
- 37
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0
answers
30
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How do you find the RTH of this?
I suddenly got confused while practice solving using Thevenin method.
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0
answers
17
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Impact of laser current source noise on RIN (relative intensity noise)
I am trying to specify the noise requirements for a constant-current source that would drive a diode laser with a certain relative intensity noise PSD. Lasers typically behave as forward-biased ...
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1
answer
43
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Increasing basic charge pump's output current
I am trying to increase the output current of this charge pump circuit but I am out of ideas
Once C1 (10mF) is charged up to roughly 3V the mosfet will open up at random intervals for 400ms thus ...
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1
answer
40
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What might cause a sudden voltage drop in an airborne drone's battery? [closed]
DJI Mavic 2 Zoom Enterprise Drone
We lost connectivity between our handheld controller and drone while flying a drone photogrammetry mission. Photogrammetry missions allow you to pre-program a flight ...
0
votes
1
answer
73
views
Arduino's impedance in breadboard circuit
(Warning, as this is a long question, asked by students that don't know what they're doing. Perhaps our questions are too general and can't be answered but at this point we'll take all the help we can ...
1
vote
1
answer
46
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MOSFET ring oscillator LT SPICE
I am designing a ring oscillator using MOSFETS to create the inverters however, I am encountering problems with the output. I feel like the ring oscillator project should be very simple and yet I can'...
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0
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1
answer
49
views
CR2477 battery peak pulse [closed]
Do you think CR2477 battery can handle 12mA pulse current for 3-4 seconds hourly. How long do you think the battery will last?
0
votes
2
answers
31
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Do we need CC1 resistors on USB C, embedded MCU circuit?
Do I need cc1 and cc2 resistors just for charging the battery? My embedded board doesn't need standard data transfer. I have on the board a USB type C connector for PC USB to TTL converter, a baud ...
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votes
0
answers
31
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Total Consumption Calculation for Multiple electric ovens
Regarding NEC Table 220.55, if I have 4 ovens at 9 kW each, since they do not exceed 12 kW, I should refer to column C. However, my question is:
Is it correct to consider 17 kW as the total ...
- 153
1
vote
1
answer
33
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Connecting bi-directional single-phase motors in parallel
I have an application that uses a 220 V AC 50 Hz motor. The motor has two live connections and a neutral. Connecting the different live connections will reverse the direction and you can have the ...
- 111
2
votes
2
answers
171
views
How can prevent the source voltage from dropping when using a 555 timer
I am trying to use a 555 timer in my circuit to produce a signal (rather generally) above 100kHz. I have been successful with this goal, but have had an issue where the voltage measured on my positive ...
- 53
1
vote
1
answer
33
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Is my PFET Orientation Correct for Reverse Voltage Protection?
Do I have the P MOSFET orientation in the attached circuit correct?
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29
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Using both safety PLC and safety relay
I am in the process of designing a robotic cell. This contains a safety door and several e-stops. I want to use the safety PLC from siemens S7-1200F. I need to have two roller tracks with 8 24V motors ...
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0
answers
25
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Wi-Fi Router Charger: is 100-240V input an acceptable replacement for a 220-240V charger? [duplicate]
My wi-fi router charger is broken and I'm looking to buy a replacement.
The old one says - input 220-240V 50/60Hz 0.5A, output 12V 2.5A, efficiency level V
Online, the closest I found has input 100-...
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votes
0
answers
31
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Ping not work on STM32H745 ETH
I'm trying to get the ethernet interface to work on an STM32H745. After fixing various hardware problems, now I don't just have software problems.
I created a simple project with CubeMX, basically I ...
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0
answers
12
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Error when mixing mixed functions in vitis HLS
I have the below code in vitis hls, the STREAM is powered by the AXI interface ports that are supplied to the function.
...
3
votes
3
answers
239
views
What do these 2 NOR gates do in this wind turbine charge controller?
I have the schematic for a wind turbine charge controller from here.
What is the purpose of the two interconnected NOR gates in the middle of the schematic?
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votes
1
answer
43
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Breville 800ESXL [closed]
This coffee machine is specified as using 110 or 220 volts but always at 60Hz.
Will it work at 50Hz? I cannot see any issue except for the pressure pump not reaching its maximum speed.
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