# All Questions

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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
12 views

### 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
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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 ...
8 views

### 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
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 ...
18 views

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 ...
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
20 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 ...
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
22 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
18 views

### 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
17 views

### 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
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 ...
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
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
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
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 ...
16 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
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 ...
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
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. ...
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 ...
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
27 views

### 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 vote
52 views

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!
1 vote
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 ...
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 ...
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
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 ...
89 views

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### 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: ...
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
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
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 (...
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
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. ...
32 views

### Use half of an MUX

Can someone give me the schematics of this half 74153 mux?
92 views

### 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
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
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?
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
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
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.
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### 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
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 ...
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 ...
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
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)...
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 ...
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