All Questions
172,479
questions
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2
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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)
...
- 1,052
0
votes
0
answers
12
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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
7
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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
8
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V4L-Utils & Vitis 2021.2 Build Instructions
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
20
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
0
answers
18
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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
12
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
0
votes
0
answers
20
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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 ...
- 235
0
votes
1
answer
34
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
22
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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
18
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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?
- 2,184
0
votes
0
answers
17
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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
28
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 ...
0
votes
1
answer
44
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 ...
- 625
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
0
votes
0
answers
50
views
NPN oscillator only works when ground applied
I have a cheap ultrasonic cleaner that only seems to work when the relay for the ultrasonic circuit is off and the Q2 transistor is grounded. Unfortunately, the only concept I seem to be able to get ...
1
vote
0
answers
32
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
16
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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
0
votes
0
answers
15
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
52
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
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votes
0
answers
18
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.
...
- 45
0
votes
1
answer
34
views
Like to use 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
21
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
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0
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27
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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
52
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
29
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
53
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
17
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
33
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
2
answers
89
views
Kirchhoff's law question
Can someone please help me to solve this problem?
I tried to solve it:
0
votes
1
answer
62
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
46
views
Weird thing happening with my latch circuit
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 ...
1
vote
0
answers
15
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. ...
- 1,306
0
votes
1
answer
35
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 (...
0
votes
3
answers
97
views
Can this circuit with two resistors oscillate?
From this lecture note.
Can this circuit oscillate as what the lecture said?
I did simulate this circuit in LTspice but it doesn't work.
The step from 1V to 0V does have many frequency components ...
- 1,521
0
votes
1
answer
15
views
GMR Sensor voltage output into magnetic field
I used a GMR sensor (Model AA003-02) inside a electricly adjustable homogenous magnetic field generated by a long coil. In other words the current is proportional to the magnetic field strength. ...
0
votes
0
answers
32
views
3
votes
3
answers
92
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Using an NMOS for a high-side switch in a buck converter
I know that to use an NMOS as a high side, you need a gate boosting circuit! I am just here to check my understanding on what WOULD happen if I did use an NMOS device without a boosting circuit and ...
1
vote
0
answers
21
views
Troubleshooting power amp board
Here's a Sunday electronics puzzle...
I'm having trouble finding the culprit on my Gallien-Krueger 2000RB power amp board. If anyone has a suggestion on what might be affecting the highlighted ...
- 11
-1
votes
1
answer
18
views
what is the wire PWM: Blue Wire on DC Fans, [closed]
What is the wire PWM: Blue Wire on DC Fans, can PWM be connected to it and the black wire?
0
votes
4
answers
46
views
How can I find my operating point in datasheet with i-v-characteristic of bjt?
I have this datasheet of the BC546 BJT:
I need to find the exit-conductivity at the operating point of 60mA and 4V, which I marked as a blue point in the i-v-characteristic. But no curve crosses ...
- 17
0
votes
2
answers
61
views
Why my timer1 not working?
My purpose is to measure phase angle between 2 square wave as below(yellow represent voltage ZCD and blue represent current ZCD passing through ACS712 hall effect current sensor)
Below is my circuit ...
- 407
2
votes
2
answers
351
views
I'm trying to simulate an audio amplifier circuit but I couldn't find how to add LM386 to LTSpice like image. Is there any suggestions?
LTspice circuit.
I couldn't find solution for this part of my simulation.
- 21
0
votes
0
answers
17
views
Monitor with Garbled Output During Cold Boot [closed]
For the longest time, I used this monitor (Asus VW266) as my primary display. However, recently this started happening as the display started up (from a being off during the night, or for longer than ...
- 101
2
votes
0
answers
30
views
Connector identification for Avermedia C875
I have an AverMedia C875 device, I would like to capture an analog output of my VCR with it. The device has a specific connector for such purposes, but I sadly don't have the dongle that originally ...
- 21
0
votes
2
answers
57
views
Peak/envelope detector circuit for 30 MHz sine pulses with a 10 kHz PRF
My goal is to input 30MHz sine pulses, with a pulse width of 10us and gap of 90us between the pulses. The circuit should convert this pulse train to a TTL signal that goes from 0 to 5 volts.
To ...
- 1
0
votes
0
answers
41
views
What will be the best way to measure 100m water drill hole for water level
I have a drill hole of about 82m depth, i tended to be used for pumping house water. From specs, static water level will be at -20m and dynamic (when the pump is running) at -70m.
Which will be the ...
- 481
1
vote
0
answers
28
views
Half-bridge driver IR2101 shorting high side and low side (In a weird condition)
I am making my own FOC BLDC driver, but there is a weird problem when I control the gate driver using PWM.
I am using three IR2101 driver IC to drive the six N-FETs, and I am using an STM32 (Blue pill)...
- 11
0
votes
0
answers
44
views
Substantial voltage drop when connecting battery to DC load
I wanted to test the battery from an e-bike. I have noticed quite strange behavior. The first thing I did was to measure the voltage. It was 66.1V which is fine for a 60V battery. When I connect the ...
- 262
10
votes
2
answers
522
views
Which way to read this five band resistor?
Sorry for this basic question. I have a problem determining which way I should read band on the resistor below. I know it's left to right, but which side of it really is "left"? As far as I ...
- 380