All Questions

1
vote
1answer
37 views

Kicad Version 5.1.0 Missing shortcuts

I have some questions regarding PCBnew of kicad 5.1.0. I cannot find how to global spread all the footprints after reading the netlist. There is no "mode button or footprint mode" any longer. How can ...
2
votes
1answer
39 views

What is this contact on a jack socket schematic?

I'm looking for a 4-poles (TRRS) 3.5mm jack socket with integrated switch, and stumbled upon this connector schematic: (this is an extract from the CLIFF FC68129 datasheet) I understand that pins 1, ...
1
vote
2answers
44 views

op-amp outputs supply voltage on GND Signal

I am trying to use an op-amp (first time). I know the basic theory of its amplification circuits. To test I am using an Arduino Nano Microcontroller to create a Signal (0-5V). I want to amplify the ...
-3
votes
0answers
27 views

What is the battery requirement? [on hold]

I have a 24 V DC motor and need a good battery for it.So I want to know which battery I should use to get the motor running for 30 mins or more .![enter image description here](https://i.stack.imgur....
1
vote
1answer
43 views

Understanding Ports on DAC

So I am working with this DAC and I am trying to attach reference voltages and outputs, but I am confused. Looking at this image of the board, what is the connection to VOUT ? How do I connect to ...
1
vote
0answers
27 views

Correct use of Silkscreen Layer and Documentation Layer

I'm looking to understand how correctly design my board silkscreen. I usually used to draw silkscreen of exact size of my package, especially for SMD parts, to easly know their dimentions and allow me ...
1
vote
2answers
80 views

Can I use a current divider to protect my IC?

I designed an oscillator circuit using a TLC555 timer IC to create a 2 second pulse, which is used to drive a 12V 6W solenoid via a relay. Both the IC and the solenoid are run off of 12V, but every ...
0
votes
0answers
23 views

Why is the length of a cable-type radio-antenna usually determined by c/f regardless of the preceeding pcb trace length?

especially when dealing with low power IoT-devices or these arduino-style radio-modules that don't come with fixed rod-like antennas but rather those cable-type antenna-tails, the length of the ...
-5
votes
1answer
57 views

Can some one explain me how this equation about op amp came? [on hold]

I dont understand how is the summing of current equation is derived .plz help me to understand it
-2
votes
0answers
26 views

Code to control monitors and their background color problem

I don't know hot to get started. I recognized this is not a coding site, but considering that EE are close related to software development , I will shoot my question here. I am looking for a code ...
0
votes
0answers
15 views

LiIon battery discharging

I have a question regarding LiIon battery discharging. Lets say I have a battery which is connected to a dc bus via a battery charger which has a bypass contactor in parallel. The charger is ...
1
vote
1answer
33 views

Stability Current Sink

I’m currently trying to create a programmable current sink. And I’m still trying to build up my circuit and searching for new parts. As I was searching for a OPA, I encountered much information about ...
3
votes
1answer
60 views

Drive Nixie tube with BJT

I'm trying to replicate the Nixie clock designed by Kevin Lee (https://0x7d.com/2017/nixie-tube-clock/). It uses a NXP PCA9685 PWM controller and a MSD42WT1G BJT to drive each tube cathode separately. ...
0
votes
3answers
108 views

How to interpret this NTSC color waveform?

How can the following NTSC video signal be interpreted? Is it using phases or frequencies or amplitudes? Is this above only the color information of a video broadcast signal? I have no background on ...
8
votes
2answers
2k views

Microchip documentation does not label CAN buss pins on micro controller pinout diagram

Link to the data sheet I want to use Microchips DSPIC33FJ128GP802 in a new project and want to use the ECAN buss. The problem ...
2
votes
0answers
52 views

A conductive ball connected to a capacitor

I am not asking for a task solution, but rather how to solve a problem. Say I have a ball of radius R, charged to a voltage of U (relative to the ground). I also have a flat capacitor with a side ...
2
votes
0answers
28 views

STM32f7 ADC DMA transfer not populating the buffer

I'm trying to compute the FFT of a 100 kHz signal from the STM32f746G discovery board using the HAL and CMSIS DSP libraries and I've run into a few issues. My first issue was trying to trigger the ...
1
vote
0answers
15 views

3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
0
votes
0answers
18 views

PLL placing fails on Lattice 5LP1K

I have a board with a Lattice ICE40 5LP1K FPGA that does some small jobs like handling communication protocol and some IOs. My problem is that I cannot compile the project as the IceCube tells me <...
0
votes
0answers
26 views

recover the state of HAL_Init () with stm32f7

i working with stm32f7 and i want recover the state of HAL_Init () i write this code but doesn't give me the state of HAL_Init my code : ...
1
vote
2answers
41 views

Capturing pulse periods by sampling accurately

Regarding the following statement: In order to preserve the integrity of the pulse through a system, it is mandatory that the group delay of the system be constant up to the maximum frequency ...
1
vote
1answer
105 views

Does anyone know which device is this?

It is used to harvest kinetic energy from a switch to power an MCU for a short period of time which drives an RF transmitter. Looks like a linear regulator but I am unable to trace it back to the ...
0
votes
0answers
28 views

Insights required to repair my Agilent YIG oscillator

I know, it's probably no chance. But let me try. The model is HP-Agilent 0955-0520, Y088-4258, that can be bought for 600-900$. Here is a picture. When I bought the oscillator, I performed multiple ...
0
votes
0answers
29 views

Analog Input Measuring Method

I have a question about wiring analog input and measuring method. It seems to me; 2 and 3 wire current analog input wiring is single ended measuring and is going to an amplifier in module that is ...
1
vote
1answer
41 views

Problem with Network Topology based on circuits

I have started reading a book lately which covers an introduction to electric circuits. Currently, I'm trying to learn the basic network topology needed to solve exercises in a more efficient manner. ...
0
votes
0answers
36 views

Wiring AC motors in parallel

I am having some Somfy motorized curtains installed in my home, but I struggle to understand the following statement in the manual: Wiring multiple Sonesse 40 WT's in parallel will result in damage ...
1
vote
1answer
19 views

Example of Electrical Apparatus that draw leading VARS and Electrical Apparatus that draw lagging VARS

I understand that an AC inductive circuit will draw lagging vars while a capacitive AC circuit will draw leading vars (ELI the ICE man), but what are some examples of real-life electrical apparatus ...
-1
votes
1answer
29 views

How can i use HTU21D-F sensor with SC16IS750 breakout board?

i have a HTU21D-F humidity and temperature sensor. I want to take data from this sensor on I2C and transformed to UART with SC16IS750 breakout board. And i want to see this signal on an oscilloscope. ...
0
votes
0answers
44 views

Distortion via Powered Speakers and not in Headphones - 1 Transistor Amplifier

I'm trying to make this NPN amplifier circuit work for my battery powered computer speakers. This circuit works fine if i connect headphones to it in output, but has distortion when connected to a ...
1
vote
2answers
43 views

What is the direction of negative reactive power

In a R+1/(jwC) load (AC)voltage lags current with θ degrees. Reactive power Q is negative because sin(θ) is negative. My question is how can a capacitive load deliver power to the source wich is ...
-1
votes
0answers
55 views

Using a coin vibrator on a PIC18 MCU

I was wondering how could I add a vibration to a PIC18F45 MCU so that when you touch a key, it would vibrator? I would like to use a dedicated pin from the MCU. Here is an example of a vibrator ...
2
votes
1answer
39 views

Do we have a peak in an overdamped RLC circuit?

Consider the natural response of a parallel RLC Overdamped circuit, we're required to find the time it takes for the voltage across the Resistor to reach it's first peak. I got the equation for the ...
0
votes
1answer
39 views

ADS1115 differential output

I have the output of a wheatstone bridge going into an ADS1115. I am exciting the bridge with a 24VDC supply and the ADS1115 with 3.3VDC through a Raspberry Pi. The issue I am having is that when I ...
0
votes
0answers
21 views

Loading an AC generator with DC Chopper + resistor

We're in kind of a bind at work and looking for easiest / cheapest way to load an AC generator (Synchronous permanent magnet machine). We have access to a big 300A Mosfet module along with it's ...
0
votes
0answers
18 views

1V Overshoot and Undershoot on Power Rails of LTE Module

I have designed a PCB (four layer) having SIM7600I LTE Module. The Stackup is: Signal & Component Layer with Ground Pour Internal Ground Power Plane Internal ...
0
votes
0answers
48 views

Deriving NEC wire reactance table values

I'm verifying the NEC impedance table manually (how it gets the values in the table). In the NEC list for AWG 1 above, the inductive reactance (Xl) for 1000 feet has value of 0.046 ohm for PVC ...
1
vote
1answer
53 views

Thevenin equivalent of the following circuit

So...I have to find \$v0\$ using exclusively Thévenin/Norton equivalents. I am completely lost since in this case I have a dependent voltage source which relies on \$v0\$ itself. \$v1,a,R1,R2\$ and ...
0
votes
1answer
66 views

STM32F103 reset button does not work

I am working project, using STM32F103C8T6 and W5500 Ethernet module. My project is something like network relay. My problem is ...
0
votes
1answer
29 views

ESP8266/ESP32 multithreaded socket server

Is there a way to implement a multithreaded socket server (telnet server) which can serve multiple clients simoulteanously on the following MCUs? Something similar to: ...
0
votes
0answers
27 views

Relay circuit for AC 70 watt

I'm going to make relay circuit for AC 70 watt, 220V based on SSR in this link I'm little confused for the R8 in my schematic, which data should I look on my TRIAC datasheet? (I will be using Z0607 ...
1
vote
0answers
27 views

How can I simulate uc3854 based circuit

I want to design pfc boost converter using uc3854 but I am not getting its simulation model also on texas TINA ti library. Where can I simulate it?
0
votes
0answers
46 views

Should I use Wifi or zigbee for remote stop go lights?

I'm working on a small project to make some remote stop and go lights, i would like to be able to easily add an extra Box to the system as and when i need it. The idea is to have red and green ...
-8
votes
1answer
88 views

How to increase frequency of my rc device? [on hold]

I'm presently trying to increase the distance i can use a rc device. So I want to know how I can do it?
0
votes
2answers
44 views

the difference between K coefficient and gm in the mosfet

i know that K in mosfet is as beta in Bjt but since it represents the change in Id in relative to the change in Vgs isn't it supposed to be the transconductance gm ? but why is it different and the ...
2
votes
1answer
60 views

How to setup the oscilloscope for measuring power supply response

I need to measure the overshoot and to modify some capacitor values in the feedback loop of the operational amplifiers in order to find the best response of the power supply (it's a linear power ...
0
votes
0answers
30 views

Is it possible to drive a capacitive touch screen work as a touch simulator?

I want to simulate a finger touch/move/etc. on capactive touch screen. Obviously using a robot arm and stylus pen is a solution, but it was expansive and the structure was too complex. It would be ...
-2
votes
0answers
55 views

Why is there a diaphragm at the tip of high tension plugs? [on hold]

I've seen a few high tension plugs with three pins, and there is a circular rubber piece that is 5mm thick over top of them. Any idea what that's for?
0
votes
1answer
24 views

Altium “Update PCB documents”, components are generated at the same place

I'm new with hierchical design in Altium. When I update the PCB, all the components of the multi sheets are generated at the same place. There is the hiearchy of the project : I highlighted the ...
0
votes
1answer
44 views

Theoretical rechargeable battery capacity question

I have very little energy usage/storage knowledge but my question will hopefully prove to be a simple one. If I have a 120 volt appliance that uses roughly 0.50 kWh a day and 600 watts at peak draw, ...
0
votes
0answers
26 views

Do you have to connect the internal thermistor wire to ensure the battery charges [on hold]

I have a bushnell golf watch and it is a 368300 mopdel. The battery is an AE 542730P with a positive and negative lead. The replacement battery has 3 leads and I cannot source an original battery to ...

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