All Questions

0
votes
0answers
17 views

Connecting BLVDS or M-LVDS to LVDS receivers

I want to distribute 8 LVDS signals via a multiDROP bus hierarchy on a backplane board with the signal source in the center and 6 ports for slave boards to the right and another 6 ports to the left. ...
0
votes
0answers
24 views

Potentiometer Selection for Fan Speed Control [duplicate]

I am making a stir plate out of an old PC fan, variable resistor, and DC power supply from this tutorial. I have two power supply's to choose from, their outputs are: PS1 = 12Vdc, 2A PS2 = 12Vdc, ...
0
votes
1answer
48 views

STM32 Ports Clock

Why do we need to ENABLE a GPIO clock by RCC_AHB register when we are using of that GPIO as a Peripheral Input/Output pin? For instance for STM32F407 ADC1, it has its own clock that can be enabled ...
0
votes
2answers
60 views

LMV324 benefit of double feedback?

What is the benefit of the double feedback of the LMV324 op. Amp.? Why was that implemented in that way? From this scheme I have to understand why was implemented in that way
0
votes
1answer
100 views

How many flip-flips would this code require?

H, I'm trying to understand the below code what how many FFs would be required when synthesis. TEST1. ...
1
vote
1answer
69 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
2
votes
1answer
118 views

Why is my led not on?

Hello I’m just a beginner and I made a simple circuit with a resistor and a capacitor with a led in between. As I understand the capacitor just accumulates the energy but why is my led not going on? ...
0
votes
1answer
137 views

Are these really capacitors?

I've bought a beginners' electronics kit, which has some electric components and things, and a book with several projects. There is a list with all the components in the kit. There are 3 different ...
2
votes
1answer
93 views

Significant DC current on precision DMM despite not being connected to anything

Disclaimer: I'm not a EE professional (I have a background in physics though), so please bear with me if the question seems banal, obvious or just plain stupid. We have a Keysight 34465A DMM, which, ...
1
vote
1answer
48 views

How to contol the height of blade in a vinyl cutter machine?

I have a machine that has 3 axis x,y,z. The machine is a vinyl cutter. The x and y axis are stepper controlled, but the z axis is a coil so my question is how does the manufacture control the z ...
0
votes
0answers
31 views

EMG controlled sustain pedał in MIDI keyboard for handicapped

I’m facing the following problem, which seems to be pretty easy to solve, but I’m not much experienced in this field and I’m not sure where to begin. The problem is about an adaptive device for a ...
0
votes
0answers
25 views

Can I use a RF and/or Time-domain reflectometer to find 'wet contact'?

Friends of mine have a circuit where the RCD trips but only after prolonged rain. There are a number of garden and security lights on that circuit so I very much suspect there is a junction box where ...
0
votes
2answers
116 views

What is this, a capacitor, if so what value. It's a mystery to me

If anyone know what kind of electrical component this is can you help me identify it please. Here is a picture, and I do t remember what I pulled it from.
0
votes
1answer
68 views

How to test my GPIO code?

Should I be asking this on Hardware Recommendations? That is – do I need some sort of test device? Or, hopefully, I can just my laptop … I am developing a vending machine controller, as a hobby ...
-3
votes
0answers
44 views

Switching high frequency DC to low frequency DC [on hold]

I'm wondering if there is a simple wat to change high frequency rectifiers pulse to low frequency, pulse square wave 10hz?
1
vote
1answer
70 views

DC motor causing project to work unexpectedly

We have developed in protoboard the following schematic for driving a DC motor with transistor for Arduino, but instead of using the PN2222 transistor, we are using a MOSFET IRF540, and instead of ...
1
vote
3answers
77 views

Selecting coaxial cable and connector for PCB referring to required frequency

I want to transmit my 24GHz signal from PCB through coaxial to antenna. I wonder how to chose best match for it, also the power is -5dBm, 50 ohm. It's based on ADF5901 2ch PA. I have found two good ...
0
votes
1answer
62 views

LMV324 particular characteristic?

Our prof. at the university asked why the LMV324 is particular. Which is the characteristic that made this component so common in the modern electronics. He was talking about the ring gain or ...
0
votes
0answers
70 views

Stumped about how this switching circuits system works

I have stumbled upon this circuit from an online electronics course (https://pirateselectronics.teachable.com, chapter "Dual Flash Lights"): The behavior of this system is that both LEDs switch on ...
0
votes
0answers
14 views

I'm seeking for alternatives to NI-DAQmx device, does they exist?

I'm seeking for alternative to NI-DAQmx device which would allow me to both have analog inputs and outputs. I have difficulties to find a device equivalent to NI-DAQmx device like the USB-6366 one. I ...
4
votes
1answer
759 views

What is this translucent heat-resistant insulation?

On the picture from this question, what is the translucent insulation on the transformer center-tap made from? It looks like polyethylene, but it obviously isn't because PE would melt at soldering ...
0
votes
1answer
104 views

Selling DIY electronics online

Ok, I have no idea if this is the best place to ask for this kind of question but I've been scattering the internet for a while to find any info regarding this: Can we sell DIY electronics online? I'...
0
votes
0answers
22 views

How do I start calculating a MEMS productions costs

I have a MEMS design and I've understood that producing a prototype in a fab will cost around 500K Euro. I am trying to estimate the cost of making 1 wafer in production but I'm not sure what to look ...
0
votes
1answer
29 views

Ideas / Alternate solutions to trigger a switch

Thank you for reading my question, I hope to learn a new way to solve my problem. I don't expect anyone to design a cicuit etc as hopefully I can do that myself, just some pointers at possible ...
-3
votes
1answer
83 views

How to reduce frequency of output signal? [on hold]

I am making a new circuit for energy harvester. The output power is about 100V and 100Hz signal. I want to get the 5V(or 3V) and 10Hz, with a minimum number of circuit components. Because the ...
0
votes
0answers
29 views

PCB design - paste coverage calculation for exposed pad (TL;DR version?)

I have created a Web tool for creating solder mask and paste mask for exposed pad: https://jsfiddle.net/d1wang/5t6urzwo/ The idea is get around limitation of DipTrace and help automate footprint ...
0
votes
1answer
85 views

Reading byte array in C++

I have following code in C++ ...
0
votes
3answers
52 views

Time Difference between 120 degrees phase shift signal or a 3 phase signsl

I am trying to create an Arduino 3 phase square wave code, and I wanted to know the time difference between each 120 degree phase shifts. With some effort I could calculate it to be 6.66 millisecond. ...
1
vote
1answer
88 views

Why do commercial components have a temperature range of -40 to 85c?

Why not -50 to 90? How was the temperature range of -40 to 85c chosen to become the industrial standard? (Some products may have a different operating temperature range, but for the majority, the ...
1
vote
2answers
50 views

Row Column Matrix Problem with Flyback Diodes

So I had a simple row column matrix which I am driving with mosfets to power solenoid locks like this: GC is ground via 1.5k resistor C is 24V via 1.5k resistor And these are the connectors: ...
0
votes
1answer
95 views

Why cant we increase chip area?

According to Moore's law, transistors are getting double every 24 months. But now, we have reached the transistor size limit which results in leakage current. Then why can't we increase chip area size,...
0
votes
0answers
10 views

doubt regarding max/min value of clock skew component in setup time equation

Kindly help me to out with the following questions asked in a recent interview: Theoretical Max and min value of clk skew in the equation of the setup time? Practical Max and min value of clk skew ...
-1
votes
0answers
34 views

Step up 3.3vdc to 5vdc circuit diagram

I need to step up 3.3vdc to 5vdc. Can anybody guide me to do the circuit in my own rather than buy one converter from the market.
-2
votes
0answers
23 views

Control systems -2nd order systems

Maximum peak overshoot of critically damped and overdamped system is 0% is it correct?
1
vote
1answer
56 views

Good resourses to learn PCB designing [on hold]

I am a beginner at PCB designing. I believe a good way to learn to design PCBs is to design them myself and then check how I did. I wanted to know of any resourses where people post their PCB designs ...
0
votes
1answer
24 views

TX leakage signal cancellation

How can I cancel leakage signal in short range pulsed radar with non-coherent processing and two antennas (TX & RX)?
0
votes
0answers
21 views

Programmable Charging controller for Li-ion/Li-Po [on hold]

I'm looking for a programmable charging controller (or set of ICs), that resembles laptop battery controllers. It will go inside of a battery pack with a small MCU and EEPROM. Critical features: 0) ...
0
votes
0answers
37 views

using 12/20kv cable on 3.3kv system voltage

could we use 12/20kv (24kv) cable to replace 3.6/6kv (7.2kv) cable in 3.3kv system voltage? what is the standard reference?
1
vote
2answers
42 views

Paralleling output of multiple BLDC motors used as generators

First of all, I apologize for anything stupid I say as I am not yet well versed in the proper technical terms and schematics. I wish to use several identical BLDC motors that will be spun at the same ...
7
votes
3answers
1k views

Estimate electrical frequency from clock shift

About 6 months ago I installed a solar power system with 2 Tesla Powerwalls for backup. Today, we got to test out the system with a power outage from an ice storm in the southeast. (We are still on ...
1
vote
1answer
32 views

FIR input frequencies

I'm looking at this question with answers in my book and I don't understand one part of it. It works out the input frequencies shown at the bottom. Can someone tell me how they are getting they input ...
-2
votes
1answer
28 views

Arduino STM32 bluepill generate PPM

does anyone knows is there a way to generate PPM (CPPM/PPMSUM) on STM32 Bluepill Arduino? Tnx in advance?
2
votes
0answers
56 views

Arduino-like microcontroller with more ram for image processing [on hold]

I want to build a device to perform image acquisition and processing, but I don't know which kind of board/microcontroller to use. My idea is to use a low-res camera, take a shot, analyze it and ...
0
votes
1answer
30 views

Identifying VW head-unit connector types

I've kind of been on a long quest to build an embedded system for working with the head unit of my '04 VW Golf. Others have done some work to detail pin-outs and write source code to send signals to ...
1
vote
0answers
90 views

Why does my DC motor does not work?

We are making a simple dc motor and using a 9V battery. Any idea why this isn’t working?
0
votes
1answer
33 views

U.S. Electricity Generation and Consumption and Average Utilization

I would like to confirm that I am on the right track here with respect to electricity generation and consumption. Given that in 2016 the total United States consumption of electricity was 4,137,100 ...
0
votes
1answer
41 views

Finding resistance and how many appliances can be connected

A household electricity system can be modelled as a fuse in series with appliances, all of which are in parallel across the 240V mains supply. In one household there is a 16A fuse in series with the ...
4
votes
2answers
151 views

Mystery! LED lights unplugged yet still lights perpetually

I got a string of LED Xmas lights hung behind my TV connected with an extension cord. I want to buy a power bar with a switch to turn it off but for now, I just unplug the strand from the extension ...
0
votes
0answers
21 views

Differential amplifier, superposition theorem, output derivation, what is a loop here?

So based on this article, when V_1 is grounded, in this picture: Is the loop number 1 correct? Or does R_3 and R_4 both belong to the same loop?
0
votes
0answers
36 views

STM32L476 Discovery ADC output is not changing even though the input voltage is

The output value of the ADC seems to flicker between 539-549 (in a range of 0-4095) no matter what voltage is on the input pin. The voltage on the input is usually between 0V - 4V. This might be a ...

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