# All Questions

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11 views

### In a delta wound 3-phase motor, how are the phase and line voltages equal?

After researching the 3 phase delta configuration, I'm confused as to how these three line-to-line and phase relationships can all be true. I have found the voltage/current relationships here , and ...
17 views

### Finding the Gain Equation of a Boost Converter with LC Resonator

I am trying to implement the following datasheet circuit in a project. The circuit is a boost converter with an LC circuit resonator (L3 and C4 resonate). I am trying to find the gain equation of the ...
27 views

### TRIAC keeps failing

I have been trying to make an AC soft starter for my home AC unit. I have built the following circuit and connected it to my AC unit compressor. As soon as the AC starts the TRIAC fails and becomes a ...
18 views

### Help identify ECG signal acquisition using AD2

I have recently got into electronics. I have access to an Analog Discovery 2 (AD2) kit with signal generator and oscilloscope functions. I have been trying to teach myself how to use this equipment ...
22 views

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### Need values for capacitors and resistors

I have experience reading schematics for making guitar pedals, but never designing a project from scratch. I have a 12V 4A battery powering a cooling element (12V TEC1-12710 Thermoelectric Cooler ...
41 views

### Is it ok to connect only 2 wires of a motor?

I've been recently messing around with motors and found out that I can do everything I need to do (forward, reverse) with just +, - and reversing current. I have some motors that use 3 or 4 wires, and ...
23 views

I am just starting out to design schematic and pcb using kicad. Few component footprints are not available in kicad libraries. I have found them in snapeda I would like to know the accuracy of the ...
34 views

47 views

### Full bridge rectifier for a 5 ns pulse

I am designing a system to measure the time of flight for a long transmission line. I am trying to convert a pulse with a width of 5 ns that can have a negative polarity (short circuit at the end of ...
20 views

### Superposition Principle: Parallel Resistance in a current source

Good Day, I would like to ask a question regarding the superposition principle particularly when the current source is the only one active. The solution to this question is that when the current ...
10 views

### problem with GML692 load cell and hx711 stm32

I want to measure weight and send it to uart using a GML692 loadcell and hx711 ADC module using stm32f103ret6. I have several problems. 1-firstly, I should put pressure on side 2 in order to increase ...
32 views

### Would this SOT-23 P-FET be appropriate for reverse current protection with current up to 1A?

I've designed in reverse current protection on a board that I'm designing. The input voltage is 24V with a potential max current draw of 1A (depends on what is plugged in, parts of the PCB are modular)...
32 views

### Measure capacitor labelled 'AC' with a digital multimeter

A capacitor is imprinted such: 450V AC 8 uF 50 - 60 Hz How to measure this capacitor? The step [multimeter mode setting] is on "capacitor", but seems it's not working and it [digital ...
13 views

### DMA Stop Function and CNDTR register Reset

I need to receive unknown length of the data with UART. So I am trying to do, Receive UART data with DMA operation. Firstly, I am checking the UART line, If the Line is Idle, I detected with line ...
54 views

### Simulation versus Prototyping

I see a lot of questions here where people have seen a certain circuit mentioned somewhere, and their first step is to run it through a simulator. In some cases I wonder if the actual hardware ever ...
75 views

### The transistor does not amplify the current enough

I have a raspberry and a fan for it. But fan is noisy and I want to start it only when CPU temperature is about some value. Fan needs 300mA and 5V. I use this scheme: I use a 2N5551L transistor. Its ...
30 views

### VHDL — K-map reduced characteristic equation fails

I have this circuit (D-latch): and I can directly write the logical equation by only watching the gates: $$Q = \overline{(\overline{(D \cdot C) + Q}) + (C \cdot \overline{D})}$$ If I want to ...
29 views

### Car Auto Light shutoff on ignition

My car has this auto lights feature which automatically turns on the headlights, each time you turn the car on. They remain on until you turn them off by flicking a switch on the toggle switch on the ...
70 views

### solve the difference equation using Z-transform

Question: solve y(n+2)-5y(n+1)+6yn=4^n[n^2-n+5] I am trying to solve this problem using z transform. I am stuck to compute the z transform of 4^n[n^2-n+5].
51 views

### How to prevent an electrical motor surge from repeatedly blowing the fuse when it stalls?

So, this is something that I shouldn't need to do, but I do. As far as I understand, it should be trivial, bit I'm hazy on the details. I have a 2kW mains AC power tool with a rotary output. Its ...
16 views

### Adjustable Sensitivity in a Light Sensor Circuit

I've designed the following circuit for detecting light and darkness and it seems to be working fine. I want to be able to set both LEDs to be off at a particular light sensitivity and to only come on ...
13 views

### CRO Phase Angle and slope of major axis is positive

Voltage E1 is applied to the horizontal input and voltage E2 is applied to the vertical input of a CRO. E1 and E2 have the same frequency. The trace is an ellipse. The slope of the major axis is ...
25 views

### helping with Cascaded multilevel inverter hardware

I am trying to implement a cascaded 5-level inverter by hardware but the signal not as fine as in the picture, how to solve this issue and the expected problem can cause this problem.? I used gate ...
10 views

### Is it possible to use a Limiting Modulator Driver as an amplifier?

The MTC5525 is basically a Limiting Modulator Driver for driving LiNbO3 modulators, which for me, says nothing, even after googling for 1 hour. But the seller says it can be used as a power amplifier. ...
26 views

### Looking for cheap IC for 56/64 pin to drive 160 seg LCD

I'm looking to drive a 160 segment LCD (8 com x 20 seg) and my device needs extra 21 GPIO pins (with RTC). I want to get to 1.5 or lower USD prices for 100 qty. So I have these 3 options: A MCU with ...
62 views

### Cree LED problem

We have a production circuit of 24 series/parallel LED arrays. Blocks of LEDs fail on power-up. Has anyone seen this before? The sequence of events is: An LED tests as bad in circuit. LED is removed ...
56 views

### Difference of Memory Protection Unit and Microprocessor? and why they have the same acronym MPU?

So I am researching a general information about MPU but I became confused when the results in the internet of what MPU is are Memory Protection Unit or Microprocessor. I would like to know what is the ...
88 views

### Why doesn't the switch command in this code work?

I want to create a clock using a timer (TMR2) to do the calculation and display current time. I have a problem dealing with the switch statement and couldn’t ...
42 views

### Converting analog voltage to drive interrupt signal in PIC microcontrollelr

I have a circuit that will output between 1v-4v when the circuit detect an event. When there is no event, the output voltage stays at 5v. I want to use this as an interrupt input signal to my ...
44 views

### How many times the loop will execute (in decimal)? [closed]

How many times the loop will execute? LXI H 1234H LOOP: DCX H MOV A H SUB L JNZ LOOP
28 views

### When to set defaults for VHDL generics

VHDL generics can have a default value. The rules for how they are overridden in instantiations and declarations seems to be rather complex, so I wanted to ask about the easiest and safest practices ...
34 views

### Why is only one channel of my dual H-bridge motor driver design failing?

I have a dual motor driver board I designed for driving 2 linear actuators with 48V and each one has as rated full load current of 3.5 amps. I can expect up to 10 amp short duration on startup, but ...
47 views

### When to use power ground with a desktop AC-DC power adaptor?

I am designing a product that will use an AC-DC power adaptor like the one shown in the picture. Nearly all of these units have an IEC320 C14 3-conductor connector for the AC power cord. Some of them ...
54 views

### Diode in feedback path of transistor (collector-base)?

This is the schematic for a fuzz circuit. Even knowing that the diode is probably what's providing the signal clipping, I still can't figure out how I'm supposed to analyze the circuit. When V(...
82 views

### Function pointers causing unexpected behaviour within STM32H753ZI Microcontroller

hope everyone one is doing well. Just out here seeing the craziest programming behaviour I have ever seen, I was wondering if anyone can explain why is this happening? I finally just finished ...
59 views

### P-Channel MOSFET With a Floating Gate

I'm troubleshooting a boost/inverting converter that was built using a TPS65131. Below is the circuit I'm working on: U37 in the schematics is an SI2323DS P-channel MOSFET. By mistake, the gate of ...
34 views

### why Arduino Nano Atmega328P D9 & D10 GPIO Blowing while using PNP Transistor S8550?

I am trying to make an Simple Sinve Wave Inverter circuit using below Schmatic. As soon as I connect this circuit D9 & D10 gets damaged. should I change the value of 100Ohm to 1K ? will that solve ...
43 views

### Why am I getting red lines when simulating this circuit?

I am trying to simulate this circuit but I end up getting red lines on the Pspice simulation, what could have caused this error. The circuit I am trying to emulate in pspice, Here is the circuit ...
21 views

### Powering Raspberry Pi 4 with ~6.1V BEC

I have a LiPo battery with specs 7.4V, 5200mah (50C if it is relevant), that I am trying to use to power a Raspberry Pi 4 for a project. I am using a BLDC motor in this setup, so I am trying to power ...
73 views

### How bad of an idea is it In an emergency to use my PV solar and propane generator together?

Set the stage: Say there is a massive grid disruption like what happened to Puerto Rico after Hurricane Maria. I live somewhere were air conditioning may be needed for some groups to remain healthy. I ...
83 views

### How is this potentiometer connected? Is pin 2 not connected? It makes no sense

How is this potentiometer connected? Is pin 2 not connected? It makes no sense... The resistance between pin 1 and 3 is always the same, so why is pin 2 not connected? (Image source: Electronics Area ...
34 views

### Balun or fully differential amplifier (or both) as a differential ADC driver at MHz frequency?

AD9655 ADC The signal is AC coupled so I don't "need" the DC coupling availability of FDAs. I don't need another gain stage either, so the FDA would be in a 0dB gain configuration. My main ...
46 views

### Driving series wound motor with MOSFETs

I'm trying to control a series wound DC motor with PWM. The motor is rated for 23V and 0.35kW. The motor has 4 connections which form 2 coils that have to be connected in series. To switch motor ...
37 views

### Double secondary winding equal to center tap?

I am trying to create a power supply with both positive and negative voltages. Is it possible to use this transformer to create such a supply? : https://my.element14.com/vigortronix/vtx-146-050-215/...
15 views

### power line from SMPS filtering for power amplifier

I am designing a power amplifier using switching mode PSU (85kHz switching frequency), and would like to hear opinions on using L-C or even R-C filters for noise line filtering and choosing f-3dB ...
35 views

### Adding power path to TP4056 solar battery charger and limit output voltage to 5.5 V or below

I have a 6 V solar panel and a bunch of TP4056 modules with the battery protection circuits lying around and I thought I'd use them to make a solar powered BLE circuit with the nRF52840 dongle for ...
48 views

### Is a battery a reasonable model for a forward biased diode and why is the knee voltages different in the below Multisim schematics?

Here are two DC sweeps from Multisim. One ranges from 0 to 15 mA and the other 0 to 50 uA. They are different! What battery voltage should be used to model a silicon diode?