All Questions

0
votes
1answer
45 views

Identify DC Motor from Dremel

I am trying to run a formerly cordless Dremel with a 12V supply. I know that the dremel runs off of a 4.8V battery, so I would like to see if I can run the motor with 12V PWM without damaging it. ...
0
votes
1answer
42 views

How do I find the right resistor for an LED panel?

I purchased one of these cheap LED panels to light a room. One review suggested that it's important to put a resistor on it, to keep it from frying itself. But, he didn't list what resistor to use. ...
0
votes
2answers
53 views

How does the comparator set the motor speed at a fixed level?

How does the comparator below sets the motor speed at a fixed level? I can think that the comparator output will turn ON if the speed proportional generator output voltage is lower than the zener ...
0
votes
0answers
42 views

Resistor & Diode ID [on hold]

I own a a treadmill that has stopped working. Soon as it is plugged in the motor turns the running belt at top speed and the motor sparks then less than a second later the the reset trips. I looked ...
1
vote
0answers
33 views

Reverse recovery parameters

I'm trying to understand the principles of reverse recovery and read several documents about it, but there are still a few questions I cannot find an answer to or just don't understand. As reference ...
-2
votes
0answers
32 views

Hi everyone,Can anyone help me with a mips project? [on hold]

I’m having trouble with my mips project
0
votes
0answers
22 views

Change SWD pin Back to SWD mode at run time in STM32F030F4

Im using PA_14 (SWCLK) as Output mode in stm32f030f4 microcontroller. I change state of this pin to output mode for a buzzer that is not in service at all time. At the end of the buzzer function I ...
1
vote
1answer
56 views

Driving 12v logic from an MCU

I'm looking to drive 12v logic signals (logic level shift) from a PIC24FJ MCU, which can do 3.3v and 5v logic. In one instance, I need to switch a 12v line to LOW, and in an other, I need to provide a ...
-1
votes
2answers
58 views

Is the ultimate purpose of electronic circuits always to supply power to other devices? [on hold]

I studied physics and computer science, so sadly im not too familiar with electronics. My question is kind of weird but hear me out: After reading a bit about (simple) electronic circuits, I got the ...
0
votes
1answer
23 views

touch switch time problem

I was looking for a way to make a touch touch switch and i found this circuit on the internet but the problem is , it goes off automatically after few seconds is there any way that i can control it ...
0
votes
0answers
45 views

How to switch between charge and discharge?

I want to make my rpi 3 portable with adding a rechargeable battery pack to it. I have 6 Li-ION batteries that are packed together in 2 series rows of 3 batteries in parallel(each battery is a 3.7 ...
0
votes
0answers
28 views

Pulse Pattern Generator ~1MHz with varying voltage pulse to pulse

I am looking to buy (or I suppose build - but bear in mind my background is in software, not electrical engineering so not sure how realistic that is) a high voltage (peak to peak voltage on the order ...
0
votes
2answers
28 views

Powering a pump on a lower voltage

First of all, I'm a newbie in electronics, please be patient with me. My problem is that I want to use a pump for a project, a ulka model e type ep5. I salvaged it from an old coffee machine. It ...
0
votes
0answers
32 views

sequence detector doesn't work expected

I am trying to write verilog code to do sequence detector the the state diagram below. Input is a 2-bit signals and there're 3 state variables as in the image. The goal is to detect the sequence (01)-...
0
votes
1answer
49 views

SK6812 - LED Flickering

I am facing a strange issue while building a simple LED matrix. I am using the SK6812 LEDs and an ESP8266 controller. The LEDS will be controlled over Wifi. My matrix contains about 180 LEDs on a PCB ...
0
votes
0answers
27 views

Estimate Phase Margin in Spice

I am trying to determine the phase margin of my design and I have come across two methods for modeling the open loop gain in spice. The problem is they are yielding slightly different results. I have ...
0
votes
1answer
30 views

STM32 bootloader protocol

I am attempting to update the application code on an STM32 chip programatically from another chip. I have an Intel format hex file generated from the build process and I would like to use the ...
1
vote
2answers
95 views

Why are stepper motor phase currents a sinusoildal waveform?

I don't know if this is a really dumb question or not, but I've seen all kinds of torque, peak-current and RMS discussions related to current drive output for stepper motors. I acknowledge that for a ...
0
votes
3answers
46 views

Peltier wiring diagram

im just an electronic enthusiast #1? Is it posible to power the peltier with a motor speed controler 220vac input and varable output. If no, why? What are the remidies #2? And if i use a 48vdc power ...
0
votes
0answers
29 views

Which micro-controller simulator or emulator to use? [on hold]

I am an ECE student working for a lab at a university. My lab group has developed a PDE solver for a specific application that we would like to evaluate (run-time, accuracy, etc.) on various micro-...
-2
votes
0answers
41 views

How to solve this attached model? [on hold]

How to solve this problem? I'm ready to buy all the parts required.
-1
votes
0answers
15 views

PPM of Wasabi Eco [migrated]

I'm currently trying to control a brushless DC motor (EMAX 1806-2280Kv) with a ESC called Wasabi Eco 12A (http://files.hapo-trade.at/pdf/WASABI%20ECO(DE+EN).pdf , https://mih-toys.de/mediafiles/PDF/...
1
vote
2answers
53 views

Using transistor as switch in the “middle” of the circuit

I have an rather complex circuit with button micro-switch in the middle (actually, it's RF remote control with 3 buttons). I would like to be able to simulate the micro-switch click on it with one of ...
0
votes
0answers
11 views

Same net but different net class with Eagle

I have a trace which powers an external device and which has to have a large size because it carries a relative high current (more than 1A). Along this trace I have a small value resistor to monitor ...
0
votes
1answer
40 views

Calculating RPM from Angular Changes

For a project, I have to determine the RPM of a turning resolver. I can correctly read the angular position of the resolver as as a hex number via an RDC. This number is then converted into a 14-bit ...
1
vote
2answers
76 views

how to make an ESD sensitive circuit?

I have an experiment where I plug a sensor to an ESD (Electrostatic Discharge) protection circuit. Sensors are very expensive and very sensitive to ESD. I have tested my protection circuit it is ...
0
votes
2answers
59 views

Bipolar signal used in differential ADC

I'm trying to find a way to convert a bipolar signal from a load cell (Futek) to an input for a differential ADC on a TIVA microcontroller(TI TM4C123GH6PM). The load cell's amplifier outputs a bipolar ...
0
votes
0answers
15 views

Bulk Current Injection on CAN bus

I'm trying to understand how the Bulk current injection would look like on the CANH and CANL lines, to understand the overloading of the ESD protection diode on the CAN lines and capacitors in ...
-3
votes
0answers
47 views

Need help with engineering in product I am designing [on hold]

I'm a design student in my final year. and I'm creating a device that provides a "physical" connection with people overseas. Both users need a "pod". User 1 can record himself through the pod while ...
0
votes
0answers
17 views

Finding specific components in EDA software

I'm looking for the best protocol for finding specific parts in EDA software? I've been mainly using EasyEDA for the past few months and have enjoyed how easy it is to search parts in the libraries ...
0
votes
2answers
118 views

PCB etching gone bad

I'm etching a double sided circuit board for my project in electrical engineering but somehow the PCB gets these weird marks and turns out bad. I tried different things like washing the PCB before ...
0
votes
1answer
51 views

2.4 GHz Chip antenna layout

I am am new to RF design and I need to place a chip antenna due to space limitations. The only antenna that is easily available to me has a very weird layout. There is no physical connection from the ...
0
votes
1answer
12 views

CSB batteries Constant Current Discharge Characteristics

I'm comparing batteries for use in UPSes and during my tests I was consulting the datasheets of 2 manufacturers. The datasheet from SunLight is crystal clear but CSB's datasheet is using terminology ...
2
votes
2answers
127 views

What is the correct schematic symbol to use for virtual ground?

I'm following the design of a circuit requiring a power supply to provide something the author calls virtual ground, \$V_{gnd}\$. The circuit look like this: However, I'm using KiCad for the design ...
0
votes
1answer
20 views

How to create continuously incrementing counter in structural modelling?

I made the below counter and stimulus/testbench and it works fine. ...
0
votes
2answers
56 views

MCP1703 quiescent current is very high

I want to use the MCP1703 regulator in battery powered projects. The datasheet of this regulator says that the quiescent current is typical 2 uA. I measured the quiescent current for the MCP1703-5 ...
0
votes
1answer
29 views

Is Pull-up present by default?

I'm using the MC9S12DP512, Motorola's microcontroller. I was executing a service and ,at the end, I put low logic level at the pins PS4, PS5 and PS6, then after that, I configured these pins as inputs....
0
votes
1answer
17 views

How do I use TIM2 as a timing source on my Stm32F407ZG? [on hold]

How do I use TIM2 to do timing on my Stm32F407ZG? The activity which I am trying to make is to turn on/off a led, using the TIM2. I know how to make to turn on the led, as it is very easy, but in ...
3
votes
4answers
4k views

How is the internal pullup resistor in a microcontroller wired?

I am constructing a circuit where 2 microcontrollers will communicate with a high or low state on their IO pin. Basicly a state pin for Bluetooth connected, or not. One microcontroller will have an IO ...
0
votes
6answers
1k views

Could transporting electricity using plastic water pipes be feasible?

Normally a household is connected with 3 different connections: Waterpipes Electric cables Internet fiber Water conducts electricity (and can also transport light), why aren't we transporting ...
2
votes
0answers
65 views

Find transfer function and step function for this circuit

can someone help me to find the transfer function of this circuit (i want to have the tension through the capacitor i think) and the step response in order to get the voltage in function of the time ...
0
votes
2answers
53 views

doubt in altuim

when I compile the project I had no error but many warnings does this affect my work. when I validate changes in engineering change order I get " failed to add class member" but later I found all the ...
0
votes
0answers
25 views

Overvoltage Protection for Battery Charger

I'm trying to come up with some form of precise overvoltage protection between battery chargers and batteries between 12V and 48V batteries. I have 12 and 24 sorted using different methods: crowbar ...
1
vote
1answer
21 views

power supply management IC switching transistor - flyback converter

I have a very simple question : is it better to have the switch (transistor) of the flyback converter, Inside the power supply management IC or outside it? or it depend on the application? Thank you ...
2
votes
2answers
65 views

How to calculate total current and power consumption from device?

I have a circuit/device that using ESP32 as microcontroller. I want to calculate how much total current and power that my device drawn. So, the current draw will be like this: My question is: The ...
0
votes
2answers
136 views

What the heck is a “radiator plate” in a CRT based oscilloscope?

I managed to pickup a used BK Precision 1474 oscilloscope for $10 and figured it would be a good gamble for the price, I powered it up and the CRT had no spot. I did some hunting and managed to find ...
-2
votes
0answers
55 views

Effect of changing external resistance on power consumption [on hold]

If, in the following circuit, the external resistance is gradually reduced from 8 ohms to 2 ohms, set the range for r (internal resistance) to ... the power consumption in external resistance. a) ...
0
votes
1answer
34 views

Find the Thevenin equivalent of the circuit [on hold]

To find the open circuit voltage between C and D, can I assume that no current flows through the current source between A and B. If it does not, the Thevenin voltage is 10V. But since it is not an ...
0
votes
1answer
52 views

Paralleling Multibit current DAC: Improving Accuracy by Averaging

No doubt that if I put in parallel n DACs, multibit (i.e. 16 bit) current output R2R ladder chips, I get n-times higher current at the summing node and the output impedance is also reduced by "n". ...
2
votes
2answers
46 views

PIC IOC vs INT and the interrupt function

I am using PIC18F26K83 and I want to use interrupts for a switch that will be connected to one of the pins of my PIC. So I have some related questions: There are 2 interrupt options in PIC18F26K83: ...

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