All Questions
172,495
questions
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9
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Interfacing PIC18F4550 with Arduino Nano
For a project, I want to communicate with Arduino Nano using PIC: PIC18F4550. PIC is collecting data from MPU6050 and DHT11; I want to send this data to Nano, which is a separate circuit for handling ...
- 101
1
vote
0
answers
13
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Why did my IGBT die? What did I do wrong?
I was doing some experiments using the following IGBT:
https://www.pollin.de/productdownloads/D130905D.PDF
I used it to drive a load of ~4.7ish Ohm and ~140ish µH from a capacitor bank of 2350µF.
Each ...
- 11
0
votes
0
answers
16
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How to check if my outlet's Ground and Neutral is wrongly mixed up or correct?
When we moved to a new house I noticed a strangely wired up outlet:
For this outlet, I am really suspicious whether the grounding is messed up and mixed up with the Neutral.
Normally Neutral and the ...
- 37
0
votes
1
answer
18
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Induced voltage in loop around wire in home AC circuit
I have an electric patio heater that has no indication of whether it's on or off. I want to wrap a loop of wire around its power cord, the goal being to induce a current that can power an LED to tell ...
- 101
0
votes
0
answers
27
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Where to find electron gun? [closed]
The contexte
I am working with an old cathodoluminescence device to do petrographic analysis on ancient marbles. It look like this:
To function it use a electron gun that looks like this:
As you can ...
- 1
0
votes
1
answer
26
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Combined amps available
If I have 5 AA batteries powering a locking device, what would be the maximum combined available amps available?
I know that 1 AA battery has 50mA but I do not know if I can just combine that value to ...
- 1
0
votes
0
answers
38
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Should I use a DC-DC converter or an LDO?
In my project, I am designing a board which is supplied by a battery. The battery is a LiPo, 3.7 V, 1000 mAh, so its voltage range is 3 - 4.2 V.
All the components on the board need a fixed voltage of ...
- 457
2
votes
0
answers
61
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Mysterious 1HRA 6-pin chip
I'm trying to fix a dead Chinese vacuum cleaner (Alfawise FJ166) and have identified all components except this small 6-pin chip. It has marking 1HRA and weird ...
- 21
0
votes
2
answers
48
views
Safety of a polarized DC breaker between the battery and the inverter
DC breakers use a magnet to blow the arc into the quenching channel. If the current is flowing in the wrong directly, the arc is pulled into the guts of the breaker and can cause the arc to be ...
- 101
3
votes
4
answers
131
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What are the effects of removing P, I, and D from a PID controller respectively?
A proportional, integral, and derivative (PID) controller can feature three terms.)
We sometimes see only two of the terms in use. For example, the derivative is disregarded for a PI controller. While ...
- 479
-3
votes
0
answers
27
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i can not find a lt1001 operation amplifier in workshop, which closest op-amp to replace it? [closed]
I want replace the lt1001 with another amplifier because I can not find in workshops around me.
0
votes
3
answers
62
views
Can I power my neon sign transformer with a higher frequency?
My NST input says 120 volts 60 hertz. It’s output is 15 Kv 30 mA 60 hertz. I was wondering if I could get a light ballast which I’ve seen drive fly back transformers at 30 kilohertz. Can I get one of ...
- 11
1
vote
1
answer
62
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Is it possible to connect a Vin to a ref of an instrumentation amplifier?
I have a circuit in which I need an instrumentation amplifier (INA128 (datasheet)) to be connected correctly for it to work. I don't know if it needs another resistance or if the input needs to be ...
- 11
1
vote
1
answer
42
views
Resizing a vector with ARM CMSIS DSP on Teensy 4.0 (Cortex M7)
I have the following code that does the resizing of a 1D vector with nearest neighbor interpolation in a similar fashion you'd also resize an image, only in 1D rather than 2D. Another term would be ...
- 169
0
votes
2
answers
43
views
Modifying RC controller to drive with Arduino
Good day all! I am trying to modify an RC car controller to control via an Arduino. The purpose is to send output data from a neural network running on my laptop. It's an autonomous RC car inspired by ...
0
votes
2
answers
69
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If I use a voltage multiplier will the output wattage be less than the input wattage?
A step up transformer steps up voltage and the wattage stays the same from the primary to secondary. Does a Cockcroft Walton generator or Marx generator work this way too? On the full wave Cockcroft ...
- 11
-1
votes
0
answers
30
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Meaning of Virtual PHY, Managed Ethernet [closed]
Can someone tell me what is the meaning of "Virtual PHY", "Managed Ethernet Switch" & "switch fabric".
Unable to get a good clarity on what terms actually mean in the ...
- 2,182
0
votes
0
answers
6
views
Which node-ID goes into the COB-ID?
I understand (or so I think) that:
CAN frames have a unique COB-ID made up of a function code plus a node ID
Transmitting nodes will have a (T)PDO mapped to a COB-ID in the OD (1800h - 19FFh)
...
- 1,167
0
votes
1
answer
38
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Modeling a transmission line
I want to simulate a transmission line in PSPICE,
however I ran into a problem.
I got floating nodes error (I looked it up and I was suggested to put a ground on the far side of the transmission line ...
- 123
0
votes
0
answers
20
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Help with voltage doubler in a WPT application
I need some help with this schematic to have higher voltage at Vrect. This is for charging a receiver at 25 mm in a WPT application. I was expecting a voltage of 2Vin at the output of the voltage ...
0
votes
0
answers
16
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V4L-Utils & Vitis 2021.2 Build Instructions [migrated]
I'm trying to build V4L-Utils using the instruction
System:
Vitis 2021.2,
Ubuntu 20.04.4 LTS
Setup:
...
- 1
0
votes
2
answers
40
views
Does the conductivity or resistance change the capacitance value if I use other material for my capacitor plates?
Capacitance depends on surface area. Now I know copper is one of the most conductive materials and is great for capacitors. Steel is so much cheaper though and I can find a plate for the same size ...
- 11
0
votes
1
answer
48
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How to implement a Bookbinder PCB design in Altium
I am planning to design a bookbinder with airgap rigid flex PCB using Altium.
Based on guidelines from Altium, and various other sources, it is important to have "staggered lengths", to ...
0
votes
0
answers
23
views
Drop in Amplifier High Frequency Gain without Large Power Capacitors
I have designed a simple class AB audio amplifier circuit which can be seen below.
I am simulating the amplifier and have used a single, 100uF capacitor for C3 and C4. The simulation is being run ...
- 315
3
votes
1
answer
123
views
Analog television: What is the difference between the first IF and second (demodulated) IF?
I am trying to understand what kind of changes occur to a signal in the chips which sit between the tuner and, for example the FM audio demodulator.
Take the attached example - the TDA2546A. It takes ...
- 267
0
votes
1
answer
52
views
Variable Forward Voltage Diode
I'm attempting to create a guitar pedal using diodes to clip the audio signal and create distortion. Specifically, I'm trying to create a circuit with variable clipping by using a circuit that acts ...
- 23
1
vote
1
answer
33
views
Power Supply Validation - What Matters?
When it comes to validating a power supply (for example, a buck regulator), what parameters matter?
From the research I have done, I think that things such as ripple voltage, percentage overshoot ...
- 581
0
votes
1
answer
33
views
What is support for an end-to-end and peer-to-peer transparent clock?
In the datasheet of LAN9353, the description states that it supports "supports end-to-end and peer-to-peer transparent clocks"
Can someone tell me what is the meaning of this?
- 2,182
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answers
31
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Effect of Quality factor of elements on the resonant frequency
I want to see the effect of the series resistor on the resonant frequency that defines the quality factor of the inductor and capacitor.
The resonant frequency is related to inductor and capacitor ...
- 307
0
votes
3
answers
43
views
Thevenin Resistance by dropping independent sources
Original Question
After dropping the sources
The solution
So my understanding is, once you drop the load resistor over a-b, the voltage at a and voltage at b are both 10 so the thevenin voltage is ...
7
votes
1
answer
441
views
NPN transistor on optocoupler ground catching on fire
I was experimenting with ways to cut power to my board and so I added an NPN transistor on the low side of an optocoupler (Q202.) I noticed my voltage regulator was oscillating from 3.3V to GND every ...
- 695
1
vote
1
answer
14
views
Over Current/Short Circuit Protection Using OPAMP and MOSFET
I wanted a circuit to limit the current to say 4A, and found this but it doesn't work in the Proteus simulator. What's wrong with this circuit? anyways to improve it?
- 11
1
vote
0
answers
37
views
ESP32 PWM: How far can it go and how many things can I control per pin?
I am designing lights lights for my fish tank and came up with the idea of using modular pucks of LEDs on small custom PCBs. This modular design would be easily scalable and reusable for future ...
- 13
0
votes
0
answers
23
views
What is the standard common mode voltage of Media Dependent Interface MDI[0:3]± signals?
I am working on the selection RJ45 connector for MDI interface between PHY and the link-partner.
I am planning to use this PHY for my SGMII interface application. From various online readings, I ...
- 309
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votes
0
answers
16
views
Jetson TX2 not powering on
I recently got a used TX2 dev board. I was able to successfully flash Ubuntu on the system. But after powering it off, It doesn't seem to power on. When I press the power on button, led CR5 blinks red ...
0
votes
2
answers
65
views
Logic analyzer gives me much more pulses than expected
Let me start the question by saying that I am using a logic analyzer for the first time, so I am probably doing something wrong.
I sniffed the signal that goes to a speaker. The signal is probably PWM....
- 847
0
votes
0
answers
31
views
Simulation of LM13700 in LTSpice
I'm trying to simulate a sample LM13700 circuit but it's not working for some reason. I need some help identifying why it isn't working.
This is contents of the lm13700.sub file:
...
- 45
0
votes
1
answer
45
views
Using the WS2811 as a vibration motor control
First of all I wanted to indicate that I am a novice and the solution to this question is probably obvious so I appreciate the readers taking time to leave a constructive comment. I also wanted to ...
0
votes
0
answers
22
views
Model positive exponential current curve on LTSPICE
I am trying to model the inrush current for a contactor. From the specifications I should get something like this:
The hold current is 0.13A and the inrush current is 3.2A. This is controlled using R3 ...
- 1,231
0
votes
0
answers
31
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How to calculate real power delivered to the sending end in a two-port network?
I know that the real power can be calculated by following equation:
$$P_s = \sqrt(3) V \cdot I \cdot cos(\alpha - \beta) $$
What is the voltage term in this case, is it line-to-line voltage or line-to-...
- 1
1
vote
1
answer
56
views
Breadboard Layout Validation
I have a breadboard with a bridge rectifier circuit that I am hoping to have someone validate for me.
The circuit with breadboard pins is:
And a picture of my breadboard is:
Thank you!
- 23
1
vote
0
answers
42
views
Don't understand why tweak changes inference from distributed RAM to block RAM
In ISE 14.7 with the following code, the synthesizer infers distributed RAM, with warning xst:3218 citing an asynchronus read
...
- 23
0
votes
3
answers
63
views
How does soft-start in a buck converter help reduce inrush current
Consider a synchronous buck converter that is off, inductor voltage is 0, capacitor voltage is 0.
The moment the high-side switch is turned on for the first time (no matter for high long). There will ...
0
votes
1
answer
20
views
Formula to calc Id of this IRF3205 in the linear region from this specific voltage measure point
I was doing a project of a electronic load and I bought a hall effect sensor to measure the current through the mosfets in this project.
Due to some instability in the hall effect sensor, I needed to ...
- 345
0
votes
1
answer
39
views
Can you use a 12V lead acid battery to switch a contactor?
So I'm making a manual precharge circuit for a solar car's motor controllers, and need to use a 12 V source to switch a contactor on/off thus switching between a resistive path and a short circuit ...
0
votes
3
answers
111
views
Kirchhoff's law question
Can someone please help me to solve this problem?
I tried to solve it:
0
votes
1
answer
67
views
Circuit board inside a charging cable
I am looking for help identifying a circuit board found inside one of the ends of a charging cable that mysteriously showed up on the desk in my home office. The board has the following stamped on it:
...
0
votes
1
answer
61
views
Weird thing happening with my latch circuit [closed]
I was experimenting with this basic latch circuit where you have an NPN transistor opening the base of PNP transistor to GND, and once the PNP is on, the collector latches into the base of the NPN, so ...
2
votes
0
answers
27
views
Altium gaps/whitespace in TrueType characters
I'd like to use Work Sans for text on my PCB design, however Altium is showing some artifacts in the font that appear as white spaces within characters. This only happens on some fonts but not others. ...
- 1,316
0
votes
1
answer
40
views
What momentary switch should I use?
I want a switch that has 2 distinct non-momentary states (say UP and Down) and a momentary state. In both states (...
